| Message ID | 20171130101132.18317-2-ard.biesheuvel@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | quirks handling for SDHCI controllers | expand |
On 11/30/2017 6:11 PM, Ard Biesheuvel wrote: > Many ARM based SoCs have integrated SDHCI controllers, and often, > these implementations deviate in subtle ways from the pertinent > specifications. On the one hand, these deviations are quite easy > to work around, but on the other hand, having a collection of SoC > specific workarounds in the generic driver stack is undesirable. > > So let's introduce an optional SD/MMC override protocol that we > can invoke at the appropriate moments in the device initialization. > That way, the workaround itself remains platform specific, but we > can still use the generic driver stack on such platforms. > > Contributed-under: TianoCore Contribution Agreement 1.1 > Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> > --- > MdeModulePkg/Include/Protocol/SdMmcOverride.h | 103 ++++++++++++++++++++ > MdeModulePkg/MdeModulePkg.dec | 3 + > 2 files changed, 106 insertions(+) > > diff --git a/MdeModulePkg/Include/Protocol/SdMmcOverride.h b/MdeModulePkg/Include/Protocol/SdMmcOverride.h > new file mode 100644 > index 000000000000..5a5c393896f4 > --- /dev/null > +++ b/MdeModulePkg/Include/Protocol/SdMmcOverride.h > @@ -0,0 +1,103 @@ > +/** @file > + Protocol to describe overrides required to support non-standard SDHCI > + implementations > + > + Copyright (c) 2017, Linaro, Ltd. All rights reserved.<BR> > + > + This program and the accompanying materials > + are licensed and made available under the terms and conditions of the BSD License > + which accompanies this distribution. The full text of the license may be found at > + http://opensource.org/licenses/bsd-license.php > + > + THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, > + WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. > + > +**/ > + > +#ifndef __SD_MMC_OVERRIDE_H__ > +#define __SD_MMC_OVERRIDE_H__ > + > +#include <Protocol/SdMmcPassThru.h> > + > +#define EDKII_SD_MMC_OVERRIDE_PROTOCOL_GUID \ > + { 0xeaf9e3c1, 0xc9cd, 0x46db, { 0xa5, 0xe5, 0x5a, 0x12, 0x4c, 0x83, 0x23, 0x23 } } > + > +#define EDKII_SD_MMC_OVERRIDE_PROTOCOL_VERSION 0x1 > + > +typedef struct _SD_MMC_OVERRIDE SD_MMC_OVERRIDE; > + > +typedef enum { > + SD_MMC_OVERRIDE_RESET_PRE_HOOK, > + SD_MMC_OVERRIDE_RESET_POST_HOOK, > + SD_MMC_OVERRIDE_INIT_HOST_PRE_HOOK, > + SD_MMC_OVERRIDE_INIT_HOST_POST_HOOK, > +} SD_MMC_OVERRIDE_HOOK; > + > +/** > + > + Override function for SDHCI capability bits > + > + @param[in] PassThru A pointer to the > + EFI_SD_MMC_PASS_THRU_PROTOCOL instance. > + @param[in] ControllerHandle The EFI_HANDLE of the controller. > + @param[in] Slot The 0 based slot index. > + @param[in,out] SdMmcHcSlotCapability The SDHCI capability structure. > + > + @retval EFI_SUCCESS The override function completed successfully. > + @retval EFI_NOT_FOUND The specified controller or slot does not exist. > + @retval EFI_INVALID_PARAMETER SdMmcHcSlotCapability is NULL > + > +**/ > +typedef > +EFI_STATUS > +(EFIAPI * SD_MMC_OVERRIDE_CAPABILITY) ( > + IN EFI_SD_MMC_PASS_THRU_PROTOCOL *PassThru, > + IN EFI_HANDLE ControllerHandle, > + IN UINT8 Slot, > + IN OUT UINT64 *SdMmcHcSlotCapability > + ); > + > +/** > + > + Override function for SDHCI controller operations > + > + @param[in] PassThru A pointer to the > + EFI_SD_MMC_PASS_THRU_PROTOCOL instance. > + @param[in] ControllerHandle The EFI_HANDLE of the controller. > + @param[in] Slot The 0 based slot index. > + @param[in,out] HookType The type of operation and whether the > + hook is invoked right before (pre) or > + right after (post) > + > + @retval EFI_SUCCESS The override function completed successfully. > + @retval EFI_NOT_FOUND The specified controller or slot does not exist. > + @retval EFI_INVALID_PARAMETER HookType is invalid > + > +**/ > +typedef > +EFI_STATUS > +(EFIAPI * SD_MMC_OVERRIDE_INVOKE_HOOK) ( > + IN EFI_SD_MMC_PASS_THRU_PROTOCOL *PassThru, > + IN EFI_HANDLE ControllerHandle, > + IN UINT8 Slot, > + IN SD_MMC_OVERRIDE_HOOK HookType > + ); > + > +struct _SD_MMC_OVERRIDE { > + // > + // Protocol version of this implementation > + // > + UINTN Version; > + // > + // Callback to override SD/MMC host controller capability bits > + // > + SD_MMC_OVERRIDE_CAPABILITY OverrideCapability; > + // > + // Callback to invoke SD/MMC override hooks > + // > + SD_MMC_OVERRIDE_INVOKE_HOOK InvokeHook; > +}; > + > +extern EFI_GUID gEdkiiSdMmcOverrideProtocolGuid; > + > +#endif > diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec > index 856d67aceb21..64ceea029f94 100644 > --- a/MdeModulePkg/MdeModulePkg.dec > +++ b/MdeModulePkg/MdeModulePkg.dec > @@ -562,6 +562,9 @@ [Protocols] > ## Include/Protocol/SmmMemoryAttribute.h > gEdkiiSmmMemoryAttributeProtocolGuid = { 0x69b792ea, 0x39ce, 0x402d, { 0xa2, 0xa6, 0xf7, 0x21, 0xde, 0x35, 0x1d, 0xfe } } > > + ## Include/Protocol/SdMmcOverride.h > + gEdkiiSdMmcOverrideProtocolGuid = { 0xeaf9e3c1, 0xc9cd, 0x46db, { 0xa5, 0xe5, 0x5a, 0x12, 0x4c, 0x83, 0x23, 0x23 } } > + > # > # [Error.gEfiMdeModulePkgTokenSpaceGuid] > # 0x80000001 | Invalid value provided. > Based on your patch #2, I think the protocol is supposed to be installed by a platform driver (let's call it SdMmcOverridePlatform) on the controller handle. There are two ways to produce this Override protocol: 1. SdMmcOverridePlatform registers a protocol notification on PciIo and find the SDMMC host controller PCI handle, then install SdMmcOverride on that handle. 2. SdMMcOverridePlatform is written as a driver model driver. DriverBindingStart() opens PciIo BY_DRIVER and produces SdMmcOverride. Then SdMmcPciHc driver opens SdMmcOverride BY_DRIVER and produces SdMmcPassthru. But since the SdMmcOverride protocol is optional, that makes #2 not workable. But #1 cannot handle the "reconnect -r" case. Because there is no protocol notification on uninstall. So I am thinking if it's more proper to make this protocol a platform level singleton instance. I noticed that all APIs exposed by this protocol already carry the Controller Handle. -- Thanks, Ray _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
If making this protocol a platform level singleton instance, is it so hard to define the interfaces and parameters since different controllers may need different hook points and parameters? Thanks, Star -----Original Message----- From: Ni, Ruiyu Sent: Tuesday, December 5, 2017 3:09 PM To: Ard Biesheuvel <ard.biesheuvel@linaro.org>; edk2-devel@lists.01.org Cc: "hao.a.wu@intel.com; Kinney.d.michael"@intel.com; Tian, Feng <feng.tian@intel.com>; Zeng, Star <star.zeng@intel.com>; leif.lindholm@linaro.org Subject: Re: [edk2] [PATCH v2 1/2] MdeModulePkg: introduce SD/MMC override protocol On 11/30/2017 6:11 PM, Ard Biesheuvel wrote: > Many ARM based SoCs have integrated SDHCI controllers, and often, > these implementations deviate in subtle ways from the pertinent > specifications. On the one hand, these deviations are quite easy to > work around, but on the other hand, having a collection of SoC > specific workarounds in the generic driver stack is undesirable. > > So let's introduce an optional SD/MMC override protocol that we can > invoke at the appropriate moments in the device initialization. > That way, the workaround itself remains platform specific, but we can > still use the generic driver stack on such platforms. > > Contributed-under: TianoCore Contribution Agreement 1.1 > Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> > --- > MdeModulePkg/Include/Protocol/SdMmcOverride.h | 103 ++++++++++++++++++++ > MdeModulePkg/MdeModulePkg.dec | 3 + > 2 files changed, 106 insertions(+) > > diff --git a/MdeModulePkg/Include/Protocol/SdMmcOverride.h > b/MdeModulePkg/Include/Protocol/SdMmcOverride.h > new file mode 100644 > index 000000000000..5a5c393896f4 > --- /dev/null > +++ b/MdeModulePkg/Include/Protocol/SdMmcOverride.h > @@ -0,0 +1,103 @@ > +/** @file > + Protocol to describe overrides required to support non-standard > +SDHCI > + implementations > + > + Copyright (c) 2017, Linaro, Ltd. All rights reserved.<BR> > + > + This program and the accompanying materials are licensed and made > + available under the terms and conditions of the BSD License which > + accompanies this distribution. The full text of the license may be > + found at http://opensource.org/licenses/bsd-license.php > + > + THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" > + BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. > + > +**/ > + > +#ifndef __SD_MMC_OVERRIDE_H__ > +#define __SD_MMC_OVERRIDE_H__ > + > +#include <Protocol/SdMmcPassThru.h> > + > +#define EDKII_SD_MMC_OVERRIDE_PROTOCOL_GUID \ > + { 0xeaf9e3c1, 0xc9cd, 0x46db, { 0xa5, 0xe5, 0x5a, 0x12, 0x4c, 0x83, > +0x23, 0x23 } } > + > +#define EDKII_SD_MMC_OVERRIDE_PROTOCOL_VERSION 0x1 > + > +typedef struct _SD_MMC_OVERRIDE SD_MMC_OVERRIDE; > + > +typedef enum { > + SD_MMC_OVERRIDE_RESET_PRE_HOOK, > + SD_MMC_OVERRIDE_RESET_POST_HOOK, > + SD_MMC_OVERRIDE_INIT_HOST_PRE_HOOK, > + SD_MMC_OVERRIDE_INIT_HOST_POST_HOOK, > +} SD_MMC_OVERRIDE_HOOK; > + > +/** > + > + Override function for SDHCI capability bits > + > + @param[in] PassThru A pointer to the > + EFI_SD_MMC_PASS_THRU_PROTOCOL instance. > + @param[in] ControllerHandle The EFI_HANDLE of the controller. > + @param[in] Slot The 0 based slot index. > + @param[in,out] SdMmcHcSlotCapability The SDHCI capability structure. > + > + @retval EFI_SUCCESS The override function completed successfully. > + @retval EFI_NOT_FOUND The specified controller or slot does not exist. > + @retval EFI_INVALID_PARAMETER SdMmcHcSlotCapability is NULL > + > +**/ > +typedef > +EFI_STATUS > +(EFIAPI * SD_MMC_OVERRIDE_CAPABILITY) ( > + IN EFI_SD_MMC_PASS_THRU_PROTOCOL *PassThru, > + IN EFI_HANDLE ControllerHandle, > + IN UINT8 Slot, > + IN OUT UINT64 *SdMmcHcSlotCapability > + ); > + > +/** > + > + Override function for SDHCI controller operations > + > + @param[in] PassThru A pointer to the > + EFI_SD_MMC_PASS_THRU_PROTOCOL instance. > + @param[in] ControllerHandle The EFI_HANDLE of the controller. > + @param[in] Slot The 0 based slot index. > + @param[in,out] HookType The type of operation and whether the > + hook is invoked right before (pre) or > + right after (post) > + > + @retval EFI_SUCCESS The override function completed successfully. > + @retval EFI_NOT_FOUND The specified controller or slot does not exist. > + @retval EFI_INVALID_PARAMETER HookType is invalid > + > +**/ > +typedef > +EFI_STATUS > +(EFIAPI * SD_MMC_OVERRIDE_INVOKE_HOOK) ( > + IN EFI_SD_MMC_PASS_THRU_PROTOCOL *PassThru, > + IN EFI_HANDLE ControllerHandle, > + IN UINT8 Slot, > + IN SD_MMC_OVERRIDE_HOOK HookType > + ); > + > +struct _SD_MMC_OVERRIDE { > + // > + // Protocol version of this implementation > + // > + UINTN Version; > + // > + // Callback to override SD/MMC host controller capability bits > + // > + SD_MMC_OVERRIDE_CAPABILITY OverrideCapability; > + // > + // Callback to invoke SD/MMC override hooks > + // > + SD_MMC_OVERRIDE_INVOKE_HOOK InvokeHook; > +}; > + > +extern EFI_GUID gEdkiiSdMmcOverrideProtocolGuid; > + > +#endif > diff --git a/MdeModulePkg/MdeModulePkg.dec > b/MdeModulePkg/MdeModulePkg.dec index 856d67aceb21..64ceea029f94 > 100644 > --- a/MdeModulePkg/MdeModulePkg.dec > +++ b/MdeModulePkg/MdeModulePkg.dec > @@ -562,6 +562,9 @@ [Protocols] > ## Include/Protocol/SmmMemoryAttribute.h > gEdkiiSmmMemoryAttributeProtocolGuid = { 0x69b792ea, 0x39ce, > 0x402d, { 0xa2, 0xa6, 0xf7, 0x21, 0xde, 0x35, 0x1d, 0xfe } } > > + ## Include/Protocol/SdMmcOverride.h > + gEdkiiSdMmcOverrideProtocolGuid = { 0xeaf9e3c1, 0xc9cd, 0x46db, { > + 0xa5, 0xe5, 0x5a, 0x12, 0x4c, 0x83, 0x23, 0x23 } } > + > # > # [Error.gEfiMdeModulePkgTokenSpaceGuid] > # 0x80000001 | Invalid value provided. > Based on your patch #2, I think the protocol is supposed to be installed by a platform driver (let's call it SdMmcOverridePlatform) on the controller handle. There are two ways to produce this Override protocol: 1. SdMmcOverridePlatform registers a protocol notification on PciIo and find the SDMMC host controller PCI handle, then install SdMmcOverride on that handle. 2. SdMMcOverridePlatform is written as a driver model driver. DriverBindingStart() opens PciIo BY_DRIVER and produces SdMmcOverride. Then SdMmcPciHc driver opens SdMmcOverride BY_DRIVER and produces SdMmcPassthru. But since the SdMmcOverride protocol is optional, that makes #2 not workable. But #1 cannot handle the "reconnect -r" case. Because there is no protocol notification on uninstall. So I am thinking if it's more proper to make this protocol a platform level singleton instance. I noticed that all APIs exposed by this protocol already carry the Controller Handle. -- Thanks, Ray _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
On 12/5/2017 3:20 PM, Zeng, Star wrote: > If making this protocol a platform level singleton instance, is it so hard to define the interfaces and parameters since different controllers may need different hook points and parameters? > > Thanks, > Star > -----Original Message----- > From: Ni, Ruiyu > Sent: Tuesday, December 5, 2017 3:09 PM > To: Ard Biesheuvel <ard.biesheuvel@linaro.org>; edk2-devel@lists.01.org > Cc: "hao.a.wu@intel.com; Kinney.d.michael"@intel.com; Tian, Feng <feng.tian@intel.com>; Zeng, Star <star.zeng@intel.com>; leif.lindholm@linaro.org > Subject: Re: [edk2] [PATCH v2 1/2] MdeModulePkg: introduce SD/MMC override protocol > > On 11/30/2017 6:11 PM, Ard Biesheuvel wrote: >> Many ARM based SoCs have integrated SDHCI controllers, and often, >> these implementations deviate in subtle ways from the pertinent >> specifications. On the one hand, these deviations are quite easy to >> work around, but on the other hand, having a collection of SoC >> specific workarounds in the generic driver stack is undesirable. >> >> So let's introduce an optional SD/MMC override protocol that we can >> invoke at the appropriate moments in the device initialization. >> That way, the workaround itself remains platform specific, but we can >> still use the generic driver stack on such platforms. >> >> Contributed-under: TianoCore Contribution Agreement 1.1 >> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> >> --- >> MdeModulePkg/Include/Protocol/SdMmcOverride.h | 103 ++++++++++++++++++++ >> MdeModulePkg/MdeModulePkg.dec | 3 + >> 2 files changed, 106 insertions(+) >> >> diff --git a/MdeModulePkg/Include/Protocol/SdMmcOverride.h >> b/MdeModulePkg/Include/Protocol/SdMmcOverride.h >> new file mode 100644 >> index 000000000000..5a5c393896f4 >> --- /dev/null >> +++ b/MdeModulePkg/Include/Protocol/SdMmcOverride.h >> @@ -0,0 +1,103 @@ >> +/** @file >> + Protocol to describe overrides required to support non-standard >> +SDHCI >> + implementations >> + >> + Copyright (c) 2017, Linaro, Ltd. All rights reserved.<BR> >> + >> + This program and the accompanying materials are licensed and made >> + available under the terms and conditions of the BSD License which >> + accompanies this distribution. The full text of the license may be >> + found at http://opensource.org/licenses/bsd-license.php >> + >> + THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" >> + BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. >> + >> +**/ >> + >> +#ifndef __SD_MMC_OVERRIDE_H__ >> +#define __SD_MMC_OVERRIDE_H__ >> + >> +#include <Protocol/SdMmcPassThru.h> >> + >> +#define EDKII_SD_MMC_OVERRIDE_PROTOCOL_GUID \ >> + { 0xeaf9e3c1, 0xc9cd, 0x46db, { 0xa5, 0xe5, 0x5a, 0x12, 0x4c, 0x83, >> +0x23, 0x23 } } >> + >> +#define EDKII_SD_MMC_OVERRIDE_PROTOCOL_VERSION 0x1 >> + >> +typedef struct _SD_MMC_OVERRIDE SD_MMC_OVERRIDE; >> + >> +typedef enum { >> + SD_MMC_OVERRIDE_RESET_PRE_HOOK, >> + SD_MMC_OVERRIDE_RESET_POST_HOOK, >> + SD_MMC_OVERRIDE_INIT_HOST_PRE_HOOK, >> + SD_MMC_OVERRIDE_INIT_HOST_POST_HOOK, >> +} SD_MMC_OVERRIDE_HOOK; >> + >> +/** >> + >> + Override function for SDHCI capability bits >> + >> + @param[in] PassThru A pointer to the >> + EFI_SD_MMC_PASS_THRU_PROTOCOL instance. >> + @param[in] ControllerHandle The EFI_HANDLE of the controller. >> + @param[in] Slot The 0 based slot index. >> + @param[in,out] SdMmcHcSlotCapability The SDHCI capability structure. >> + >> + @retval EFI_SUCCESS The override function completed successfully. >> + @retval EFI_NOT_FOUND The specified controller or slot does not exist. >> + @retval EFI_INVALID_PARAMETER SdMmcHcSlotCapability is NULL >> + >> +**/ >> +typedef >> +EFI_STATUS >> +(EFIAPI * SD_MMC_OVERRIDE_CAPABILITY) ( >> + IN EFI_SD_MMC_PASS_THRU_PROTOCOL *PassThru, >> + IN EFI_HANDLE ControllerHandle, >> + IN UINT8 Slot, >> + IN OUT UINT64 *SdMmcHcSlotCapability >> + ); >> + >> +/** >> + >> + Override function for SDHCI controller operations >> + >> + @param[in] PassThru A pointer to the >> + EFI_SD_MMC_PASS_THRU_PROTOCOL instance. >> + @param[in] ControllerHandle The EFI_HANDLE of the controller. >> + @param[in] Slot The 0 based slot index. >> + @param[in,out] HookType The type of operation and whether the >> + hook is invoked right before (pre) or >> + right after (post) >> + >> + @retval EFI_SUCCESS The override function completed successfully. >> + @retval EFI_NOT_FOUND The specified controller or slot does not exist. >> + @retval EFI_INVALID_PARAMETER HookType is invalid >> + >> +**/ >> +typedef >> +EFI_STATUS >> +(EFIAPI * SD_MMC_OVERRIDE_INVOKE_HOOK) ( >> + IN EFI_SD_MMC_PASS_THRU_PROTOCOL *PassThru, >> + IN EFI_HANDLE ControllerHandle, >> + IN UINT8 Slot, >> + IN SD_MMC_OVERRIDE_HOOK HookType >> + ); >> + >> +struct _SD_MMC_OVERRIDE { >> + // >> + // Protocol version of this implementation >> + // >> + UINTN Version; >> + // >> + // Callback to override SD/MMC host controller capability bits >> + // >> + SD_MMC_OVERRIDE_CAPABILITY OverrideCapability; >> + // >> + // Callback to invoke SD/MMC override hooks >> + // >> + SD_MMC_OVERRIDE_INVOKE_HOOK InvokeHook; >> +}; >> + >> +extern EFI_GUID gEdkiiSdMmcOverrideProtocolGuid; >> + >> +#endif >> diff --git a/MdeModulePkg/MdeModulePkg.dec >> b/MdeModulePkg/MdeModulePkg.dec index 856d67aceb21..64ceea029f94 >> 100644 >> --- a/MdeModulePkg/MdeModulePkg.dec >> +++ b/MdeModulePkg/MdeModulePkg.dec >> @@ -562,6 +562,9 @@ [Protocols] >> ## Include/Protocol/SmmMemoryAttribute.h >> gEdkiiSmmMemoryAttributeProtocolGuid = { 0x69b792ea, 0x39ce, >> 0x402d, { 0xa2, 0xa6, 0xf7, 0x21, 0xde, 0x35, 0x1d, 0xfe } } >> >> + ## Include/Protocol/SdMmcOverride.h >> + gEdkiiSdMmcOverrideProtocolGuid = { 0xeaf9e3c1, 0xc9cd, 0x46db, { >> + 0xa5, 0xe5, 0x5a, 0x12, 0x4c, 0x83, 0x23, 0x23 } } >> + >> # >> # [Error.gEfiMdeModulePkgTokenSpaceGuid] >> # 0x80000001 | Invalid value provided. >> > Based on your patch #2, I think the protocol is supposed to be installed by a platform driver (let's call it SdMmcOverridePlatform) on the controller handle. > > There are two ways to produce this Override protocol: > 1. SdMmcOverridePlatform registers a protocol notification on PciIo and find the SDMMC host controller PCI handle, then install SdMmcOverride on that handle. > 2. SdMMcOverridePlatform is written as a driver model driver. > DriverBindingStart() opens PciIo BY_DRIVER and produces SdMmcOverride. > Then SdMmcPciHc driver opens SdMmcOverride BY_DRIVER and produces SdMmcPassthru. > > But since the SdMmcOverride protocol is optional, that makes #2 not workable. > > But #1 cannot handle the "reconnect -r" case. Because there is no protocol notification on uninstall. > > So I am thinking if it's more proper to make this protocol a platform level singleton instance. I noticed that all APIs exposed by this protocol already carry the Controller Handle. > > -- > Thanks, > Ray > Star, I meant to create a SdMmcPlatform protocol. -- Thanks, Ray _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
Regardless the protocol name SdMmcOverride/SdMmcPlatform, so you mean the protocol should be produced by a DXE driver, but not a UEFI driver, right? I saw the example at https://lists.01.org/pipermail/edk2-devel/2017-November/017672.html shared by Ard installs the protocol in PlatformDxe that is a DXE driver. And you mean the SD/MMC host controller driver code should use LocateProtocol, but not HandleProtocol to find out the protocol instance, right? Thanks, Star -----Original Message----- From: Ni, Ruiyu Sent: Tuesday, December 5, 2017 4:37 PM To: Zeng, Star <star.zeng@intel.com>; Ard Biesheuvel <ard.biesheuvel@linaro.org>; edk2-devel@lists.01.org Cc: Wu, Hao A <hao.a.wu@intel.com>; Kinney, Michael D <michael.d.kinney@intel.com>; Tian, Feng <feng.tian@intel.com>; leif.lindholm@linaro.org Subject: Re: [edk2] [PATCH v2 1/2] MdeModulePkg: introduce SD/MMC override protocol On 12/5/2017 3:20 PM, Zeng, Star wrote: > If making this protocol a platform level singleton instance, is it so hard to define the interfaces and parameters since different controllers may need different hook points and parameters? > > Thanks, > Star > -----Original Message----- > From: Ni, Ruiyu > Sent: Tuesday, December 5, 2017 3:09 PM > To: Ard Biesheuvel <ard.biesheuvel@linaro.org>; > edk2-devel@lists.01.org > Cc: "hao.a.wu@intel.com; Kinney.d.michael"@intel.com; Tian, Feng > <feng.tian@intel.com>; Zeng, Star <star.zeng@intel.com>; > leif.lindholm@linaro.org > Subject: Re: [edk2] [PATCH v2 1/2] MdeModulePkg: introduce SD/MMC > override protocol > > On 11/30/2017 6:11 PM, Ard Biesheuvel wrote: >> Many ARM based SoCs have integrated SDHCI controllers, and often, >> these implementations deviate in subtle ways from the pertinent >> specifications. On the one hand, these deviations are quite easy to >> work around, but on the other hand, having a collection of SoC >> specific workarounds in the generic driver stack is undesirable. >> >> So let's introduce an optional SD/MMC override protocol that we can >> invoke at the appropriate moments in the device initialization. >> That way, the workaround itself remains platform specific, but we can >> still use the generic driver stack on such platforms. >> >> Contributed-under: TianoCore Contribution Agreement 1.1 >> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> >> --- >> MdeModulePkg/Include/Protocol/SdMmcOverride.h | 103 ++++++++++++++++++++ >> MdeModulePkg/MdeModulePkg.dec | 3 + >> 2 files changed, 106 insertions(+) >> >> diff --git a/MdeModulePkg/Include/Protocol/SdMmcOverride.h >> b/MdeModulePkg/Include/Protocol/SdMmcOverride.h >> new file mode 100644 >> index 000000000000..5a5c393896f4 >> --- /dev/null >> +++ b/MdeModulePkg/Include/Protocol/SdMmcOverride.h >> @@ -0,0 +1,103 @@ >> +/** @file >> + Protocol to describe overrides required to support non-standard >> +SDHCI >> + implementations >> + >> + Copyright (c) 2017, Linaro, Ltd. All rights reserved.<BR> >> + >> + This program and the accompanying materials are licensed and made >> + available under the terms and conditions of the BSD License which >> + accompanies this distribution. The full text of the license may be >> + found at http://opensource.org/licenses/bsd-license.php >> + >> + THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" >> + BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. >> + >> +**/ >> + >> +#ifndef __SD_MMC_OVERRIDE_H__ >> +#define __SD_MMC_OVERRIDE_H__ >> + >> +#include <Protocol/SdMmcPassThru.h> >> + >> +#define EDKII_SD_MMC_OVERRIDE_PROTOCOL_GUID \ >> + { 0xeaf9e3c1, 0xc9cd, 0x46db, { 0xa5, 0xe5, 0x5a, 0x12, 0x4c, >> +0x83, 0x23, 0x23 } } >> + >> +#define EDKII_SD_MMC_OVERRIDE_PROTOCOL_VERSION 0x1 >> + >> +typedef struct _SD_MMC_OVERRIDE SD_MMC_OVERRIDE; >> + >> +typedef enum { >> + SD_MMC_OVERRIDE_RESET_PRE_HOOK, >> + SD_MMC_OVERRIDE_RESET_POST_HOOK, >> + SD_MMC_OVERRIDE_INIT_HOST_PRE_HOOK, >> + SD_MMC_OVERRIDE_INIT_HOST_POST_HOOK, >> +} SD_MMC_OVERRIDE_HOOK; >> + >> +/** >> + >> + Override function for SDHCI capability bits >> + >> + @param[in] PassThru A pointer to the >> + EFI_SD_MMC_PASS_THRU_PROTOCOL instance. >> + @param[in] ControllerHandle The EFI_HANDLE of the controller. >> + @param[in] Slot The 0 based slot index. >> + @param[in,out] SdMmcHcSlotCapability The SDHCI capability structure. >> + >> + @retval EFI_SUCCESS The override function completed successfully. >> + @retval EFI_NOT_FOUND The specified controller or slot does not exist. >> + @retval EFI_INVALID_PARAMETER SdMmcHcSlotCapability is NULL >> + >> +**/ >> +typedef >> +EFI_STATUS >> +(EFIAPI * SD_MMC_OVERRIDE_CAPABILITY) ( >> + IN EFI_SD_MMC_PASS_THRU_PROTOCOL *PassThru, >> + IN EFI_HANDLE ControllerHandle, >> + IN UINT8 Slot, >> + IN OUT UINT64 *SdMmcHcSlotCapability >> + ); >> + >> +/** >> + >> + Override function for SDHCI controller operations >> + >> + @param[in] PassThru A pointer to the >> + EFI_SD_MMC_PASS_THRU_PROTOCOL instance. >> + @param[in] ControllerHandle The EFI_HANDLE of the controller. >> + @param[in] Slot The 0 based slot index. >> + @param[in,out] HookType The type of operation and whether the >> + hook is invoked right before (pre) or >> + right after (post) >> + >> + @retval EFI_SUCCESS The override function completed successfully. >> + @retval EFI_NOT_FOUND The specified controller or slot does not exist. >> + @retval EFI_INVALID_PARAMETER HookType is invalid >> + >> +**/ >> +typedef >> +EFI_STATUS >> +(EFIAPI * SD_MMC_OVERRIDE_INVOKE_HOOK) ( >> + IN EFI_SD_MMC_PASS_THRU_PROTOCOL *PassThru, >> + IN EFI_HANDLE ControllerHandle, >> + IN UINT8 Slot, >> + IN SD_MMC_OVERRIDE_HOOK HookType >> + ); >> + >> +struct _SD_MMC_OVERRIDE { >> + // >> + // Protocol version of this implementation >> + // >> + UINTN Version; >> + // >> + // Callback to override SD/MMC host controller capability bits >> + // >> + SD_MMC_OVERRIDE_CAPABILITY OverrideCapability; >> + // >> + // Callback to invoke SD/MMC override hooks >> + // >> + SD_MMC_OVERRIDE_INVOKE_HOOK InvokeHook; >> +}; >> + >> +extern EFI_GUID gEdkiiSdMmcOverrideProtocolGuid; >> + >> +#endif >> diff --git a/MdeModulePkg/MdeModulePkg.dec >> b/MdeModulePkg/MdeModulePkg.dec index 856d67aceb21..64ceea029f94 >> 100644 >> --- a/MdeModulePkg/MdeModulePkg.dec >> +++ b/MdeModulePkg/MdeModulePkg.dec >> @@ -562,6 +562,9 @@ [Protocols] >> ## Include/Protocol/SmmMemoryAttribute.h >> gEdkiiSmmMemoryAttributeProtocolGuid = { 0x69b792ea, 0x39ce, >> 0x402d, { 0xa2, 0xa6, 0xf7, 0x21, 0xde, 0x35, 0x1d, 0xfe } } >> >> + ## Include/Protocol/SdMmcOverride.h >> + gEdkiiSdMmcOverrideProtocolGuid = { 0xeaf9e3c1, 0xc9cd, 0x46db, { >> + 0xa5, 0xe5, 0x5a, 0x12, 0x4c, 0x83, 0x23, 0x23 } } >> + >> # >> # [Error.gEfiMdeModulePkgTokenSpaceGuid] >> # 0x80000001 | Invalid value provided. >> > Based on your patch #2, I think the protocol is supposed to be installed by a platform driver (let's call it SdMmcOverridePlatform) on the controller handle. > > There are two ways to produce this Override protocol: > 1. SdMmcOverridePlatform registers a protocol notification on PciIo and find the SDMMC host controller PCI handle, then install SdMmcOverride on that handle. > 2. SdMMcOverridePlatform is written as a driver model driver. > DriverBindingStart() opens PciIo BY_DRIVER and produces SdMmcOverride. > Then SdMmcPciHc driver opens SdMmcOverride BY_DRIVER and produces SdMmcPassthru. > > But since the SdMmcOverride protocol is optional, that makes #2 not workable. > > But #1 cannot handle the "reconnect -r" case. Because there is no protocol notification on uninstall. > > So I am thinking if it's more proper to make this protocol a platform level singleton instance. I noticed that all APIs exposed by this protocol already carry the Controller Handle. > > -- > Thanks, > Ray > Star, I meant to create a SdMmcPlatform protocol. -- Thanks, Ray _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
On 5 December 2017 at 08:50, Zeng, Star <star.zeng@intel.com> wrote: > Regardless the protocol name SdMmcOverride/SdMmcPlatform, so you mean the protocol should be produced by a DXE driver, but not a UEFI driver, right? I saw the example at https://lists.01.org/pipermail/edk2-devel/2017-November/017672.html shared by Ard installs the protocol in PlatformDxe that is a DXE driver. > > And you mean the SD/MMC host controller driver code should use LocateProtocol, but not HandleProtocol to find out the protocol instance, right? > I think this makes sense, yes. I will respin the second patch accordingly. -- Ard. _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
Some comments re the detailed interfaces embedded in below. On 11/30/2017 6:11 PM, Ard Biesheuvel wrote: > Many ARM based SoCs have integrated SDHCI controllers, and often, > these implementations deviate in subtle ways from the pertinent > specifications. On the one hand, these deviations are quite easy > to work around, but on the other hand, having a collection of SoC > specific workarounds in the generic driver stack is undesirable. > > So let's introduce an optional SD/MMC override protocol that we > can invoke at the appropriate moments in the device initialization. > That way, the workaround itself remains platform specific, but we > can still use the generic driver stack on such platforms. > > Contributed-under: TianoCore Contribution Agreement 1.1 > Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> > --- > MdeModulePkg/Include/Protocol/SdMmcOverride.h | 103 ++++++++++++++++++++ > MdeModulePkg/MdeModulePkg.dec | 3 + > 2 files changed, 106 insertions(+) > > diff --git a/MdeModulePkg/Include/Protocol/SdMmcOverride.h b/MdeModulePkg/Include/Protocol/SdMmcOverride.h > new file mode 100644 > index 000000000000..5a5c393896f4 > --- /dev/null > +++ b/MdeModulePkg/Include/Protocol/SdMmcOverride.h > @@ -0,0 +1,103 @@ > +/** @file > + Protocol to describe overrides required to support non-standard SDHCI > + implementations > + > + Copyright (c) 2017, Linaro, Ltd. All rights reserved.<BR> > + > + This program and the accompanying materials > + are licensed and made available under the terms and conditions of the BSD License > + which accompanies this distribution. The full text of the license may be found at > + http://opensource.org/licenses/bsd-license.php > + > + THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, > + WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. > + > +**/ > + > +#ifndef __SD_MMC_OVERRIDE_H__ > +#define __SD_MMC_OVERRIDE_H__ > + > +#include <Protocol/SdMmcPassThru.h> > + > +#define EDKII_SD_MMC_OVERRIDE_PROTOCOL_GUID \ > + { 0xeaf9e3c1, 0xc9cd, 0x46db, { 0xa5, 0xe5, 0x5a, 0x12, 0x4c, 0x83, 0x23, 0x23 } } > + > +#define EDKII_SD_MMC_OVERRIDE_PROTOCOL_VERSION 0x1 > + > +typedef struct _SD_MMC_OVERRIDE SD_MMC_OVERRIDE; > + > +typedef enum { > + SD_MMC_OVERRIDE_RESET_PRE_HOOK, > + SD_MMC_OVERRIDE_RESET_POST_HOOK, > + SD_MMC_OVERRIDE_INIT_HOST_PRE_HOOK, > + SD_MMC_OVERRIDE_INIT_HOST_POST_HOOK, How about using name like "SdMmcResetPre"? Do "ResetPre"/"ResetPost" / "InitHostPre" / "InitHostPost" cover all potential check points? > +} SD_MMC_OVERRIDE_HOOK; How about use "SD_MMC_PHASE_TYPE"? > + > +/** > + > + Override function for SDHCI capability bits > + > + @param[in] PassThru A pointer to the > + EFI_SD_MMC_PASS_THRU_PROTOCOL instance. > + @param[in] ControllerHandle The EFI_HANDLE of the controller. > + @param[in] Slot The 0 based slot index. > + @param[in,out] SdMmcHcSlotCapability The SDHCI capability structure. > + > + @retval EFI_SUCCESS The override function completed successfully. > + @retval EFI_NOT_FOUND The specified controller or slot does not exist. > + @retval EFI_INVALID_PARAMETER SdMmcHcSlotCapability is NULL > + > +**/ > +typedef > +EFI_STATUS > +(EFIAPI * SD_MMC_OVERRIDE_CAPABILITY) ( How about "SD_MMC_CAPABILITY"? > + IN EFI_SD_MMC_PASS_THRU_PROTOCOL *PassThru, > + IN EFI_HANDLE ControllerHandle, > + IN UINT8 Slot, > + IN OUT UINT64 *SdMmcHcSlotCapability > + ); Is this API too specific? Besides SlotCapability, is there any other attributes that may need override as well? > + > +/** > + > + Override function for SDHCI controller operations > + > + @param[in] PassThru A pointer to the > + EFI_SD_MMC_PASS_THRU_PROTOCOL instance. > + @param[in] ControllerHandle The EFI_HANDLE of the controller. > + @param[in] Slot The 0 based slot index. > + @param[in,out] HookType The type of operation and whether the > + hook is invoked right before (pre) or > + right after (post) > + > + @retval EFI_SUCCESS The override function completed successfully. > + @retval EFI_NOT_FOUND The specified controller or slot does not exist. > + @retval EFI_INVALID_PARAMETER HookType is invalid > + > +**/ > +typedef > +EFI_STATUS > +(EFIAPI * SD_MMC_OVERRIDE_INVOKE_HOOK) ( How about "SD_MMC_NOTIFY_PHASE"? > + IN EFI_SD_MMC_PASS_THRU_PROTOCOL *PassThru, > + IN EFI_HANDLE ControllerHandle, > + IN UINT8 Slot, > + IN SD_MMC_OVERRIDE_HOOK HookType > + ); > + > +struct _SD_MMC_OVERRIDE { > + // > + // Protocol version of this implementation > + // > + UINTN Version; > + // > + // Callback to override SD/MMC host controller capability bits > + // > + SD_MMC_OVERRIDE_CAPABILITY OverrideCapability;How about "Capability"? So the caller writes code as "SdMmcOverride->Capability()". > + // > + // Callback to invoke SD/MMC override hooks > + // > + SD_MMC_OVERRIDE_INVOKE_HOOK InvokeHook; How about "NotifyPhase"? > +}; > + > +extern EFI_GUID gEdkiiSdMmcOverrideProtocolGuid; > + > +#endif > diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec > index 856d67aceb21..64ceea029f94 100644 > --- a/MdeModulePkg/MdeModulePkg.dec > +++ b/MdeModulePkg/MdeModulePkg.dec > @@ -562,6 +562,9 @@ [Protocols] > ## Include/Protocol/SmmMemoryAttribute.h > gEdkiiSmmMemoryAttributeProtocolGuid = { 0x69b792ea, 0x39ce, 0x402d, { 0xa2, 0xa6, 0xf7, 0x21, 0xde, 0x35, 0x1d, 0xfe } } > > + ## Include/Protocol/SdMmcOverride.h > + gEdkiiSdMmcOverrideProtocolGuid = { 0xeaf9e3c1, 0xc9cd, 0x46db, { 0xa5, 0xe5, 0x5a, 0x12, 0x4c, 0x83, 0x23, 0x23 } } > + > # > # [Error.gEfiMdeModulePkgTokenSpaceGuid] > # 0x80000001 | Invalid value provided. > -- Thanks, Ray _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
On 5 December 2017 at 10:12, Ni, Ruiyu <ruiyu.ni@intel.com> wrote: > Some comments re the detailed interfaces embedded in below. > > On 11/30/2017 6:11 PM, Ard Biesheuvel wrote: >> >> Many ARM based SoCs have integrated SDHCI controllers, and often, >> these implementations deviate in subtle ways from the pertinent >> specifications. On the one hand, these deviations are quite easy >> to work around, but on the other hand, having a collection of SoC >> specific workarounds in the generic driver stack is undesirable. >> >> So let's introduce an optional SD/MMC override protocol that we >> can invoke at the appropriate moments in the device initialization. >> That way, the workaround itself remains platform specific, but we >> can still use the generic driver stack on such platforms. >> >> Contributed-under: TianoCore Contribution Agreement 1.1 >> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> >> --- >> MdeModulePkg/Include/Protocol/SdMmcOverride.h | 103 ++++++++++++++++++++ >> MdeModulePkg/MdeModulePkg.dec | 3 + >> 2 files changed, 106 insertions(+) >> >> diff --git a/MdeModulePkg/Include/Protocol/SdMmcOverride.h >> b/MdeModulePkg/Include/Protocol/SdMmcOverride.h >> new file mode 100644 >> index 000000000000..5a5c393896f4 >> --- /dev/null >> +++ b/MdeModulePkg/Include/Protocol/SdMmcOverride.h >> @@ -0,0 +1,103 @@ >> +/** @file >> + Protocol to describe overrides required to support non-standard SDHCI >> + implementations >> + >> + Copyright (c) 2017, Linaro, Ltd. All rights reserved.<BR> >> + >> + This program and the accompanying materials >> + are licensed and made available under the terms and conditions of the >> BSD License >> + which accompanies this distribution. The full text of the license may >> be found at >> + http://opensource.org/licenses/bsd-license.php >> + >> + THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, >> + WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR >> IMPLIED. >> + >> +**/ >> + >> +#ifndef __SD_MMC_OVERRIDE_H__ >> +#define __SD_MMC_OVERRIDE_H__ >> + >> +#include <Protocol/SdMmcPassThru.h> >> + >> +#define EDKII_SD_MMC_OVERRIDE_PROTOCOL_GUID \ >> + { 0xeaf9e3c1, 0xc9cd, 0x46db, { 0xa5, 0xe5, 0x5a, 0x12, 0x4c, 0x83, >> 0x23, 0x23 } } >> + >> +#define EDKII_SD_MMC_OVERRIDE_PROTOCOL_VERSION 0x1 >> + >> +typedef struct _SD_MMC_OVERRIDE SD_MMC_OVERRIDE; >> + >> +typedef enum { >> + SD_MMC_OVERRIDE_RESET_PRE_HOOK, >> + SD_MMC_OVERRIDE_RESET_POST_HOOK, >> + SD_MMC_OVERRIDE_INIT_HOST_PRE_HOOK, >> + SD_MMC_OVERRIDE_INIT_HOST_POST_HOOK, > > > How about using name like "SdMmcResetPre"? Sure > Do "ResetPre"/"ResetPost" / "InitHostPre" / "InitHostPost" cover > all potential check points? > Perhaps not, but it is hard to predict the future :-) This is why I added the version field. (I should also update the second patch to reject the protocol if its version is higher than EDKII_SD_MMC_OVERRIDE_PROTOCOL_VERSION) >> +} SD_MMC_OVERRIDE_HOOK; > > How about use "SD_MMC_PHASE_TYPE"? > Sure. > >> + >> +/** >> + >> + Override function for SDHCI capability bits >> + >> + @param[in] PassThru A pointer to the >> + EFI_SD_MMC_PASS_THRU_PROTOCOL >> instance. >> + @param[in] ControllerHandle The EFI_HANDLE of the controller. >> + @param[in] Slot The 0 based slot index. >> + @param[in,out] SdMmcHcSlotCapability The SDHCI capability structure. >> + >> + @retval EFI_SUCCESS The override function completed >> successfully. >> + @retval EFI_NOT_FOUND The specified controller or slot does not >> exist. >> + @retval EFI_INVALID_PARAMETER SdMmcHcSlotCapability is NULL >> + >> +**/ >> +typedef >> +EFI_STATUS >> +(EFIAPI * SD_MMC_OVERRIDE_CAPABILITY) ( > > > How about "SD_MMC_CAPABILITY"? > Sure. >> + IN EFI_SD_MMC_PASS_THRU_PROTOCOL *PassThru, >> + IN EFI_HANDLE ControllerHandle, >> + IN UINT8 Slot, >> + IN OUT UINT64 *SdMmcHcSlotCapability >> + ); > > > Is this API too specific? > Besides SlotCapability, is there any other attributes that may need > override as well? > The capability structure is the root data structure that describes the SD/MMC host controller. Which other data structures did you have in mind? >> + >> +/** >> + >> + Override function for SDHCI controller operations >> + >> + @param[in] PassThru A pointer to the >> + EFI_SD_MMC_PASS_THRU_PROTOCOL >> instance. >> + @param[in] ControllerHandle The EFI_HANDLE of the controller. >> + @param[in] Slot The 0 based slot index. >> + @param[in,out] HookType The type of operation and whether >> the >> + hook is invoked right before >> (pre) or >> + right after (post) >> + >> + @retval EFI_SUCCESS The override function completed >> successfully. >> + @retval EFI_NOT_FOUND The specified controller or slot does not >> exist. >> + @retval EFI_INVALID_PARAMETER HookType is invalid >> + >> +**/ >> +typedef >> +EFI_STATUS >> +(EFIAPI * SD_MMC_OVERRIDE_INVOKE_HOOK) ( > > > How about "SD_MMC_NOTIFY_PHASE"? > Sure. >> + IN EFI_SD_MMC_PASS_THRU_PROTOCOL *PassThru, >> + IN EFI_HANDLE ControllerHandle, >> + IN UINT8 Slot, >> + IN SD_MMC_OVERRIDE_HOOK HookType >> + ); >> + >> +struct _SD_MMC_OVERRIDE { >> + // >> + // Protocol version of this implementation >> + // >> + UINTN Version; >> + // >> + // Callback to override SD/MMC host controller capability bits >> + // >> + SD_MMC_OVERRIDE_CAPABILITY OverrideCapability;How about >> "Capability"? So the caller writes code as > > "SdMmcOverride->Capability()". Sure. >> >> + // >> + // Callback to invoke SD/MMC override hooks >> + // >> + SD_MMC_OVERRIDE_INVOKE_HOOK InvokeHook; > > How about "NotifyPhase"? Sure. >> >> +}; >> + >> +extern EFI_GUID gEdkiiSdMmcOverrideProtocolGuid; >> + >> +#endif >> diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec >> index 856d67aceb21..64ceea029f94 100644 >> --- a/MdeModulePkg/MdeModulePkg.dec >> +++ b/MdeModulePkg/MdeModulePkg.dec >> @@ -562,6 +562,9 @@ [Protocols] >> ## Include/Protocol/SmmMemoryAttribute.h >> gEdkiiSmmMemoryAttributeProtocolGuid = { 0x69b792ea, 0x39ce, 0x402d, { >> 0xa2, 0xa6, 0xf7, 0x21, 0xde, 0x35, 0x1d, 0xfe } } >> + ## Include/Protocol/SdMmcOverride.h >> + gEdkiiSdMmcOverrideProtocolGuid = { 0xeaf9e3c1, 0xc9cd, 0x46db, { 0xa5, >> 0xe5, 0x5a, 0x12, 0x4c, 0x83, 0x23, 0x23 } } >> + >> # >> # [Error.gEfiMdeModulePkgTokenSpaceGuid] >> # 0x80000001 | Invalid value provided. >> > > > -- > Thanks, > Ray _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
BTW, I prefer all the typedef and structure/field names have EDKII_ prefix, for example MdeModulePkg\Include\Protocol\IoMmu.h and MdeModulePkg\Include\Ppi\SdMmcHostController.h. Thanks, Star -----Original Message----- From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Ard Biesheuvel Sent: Tuesday, December 5, 2017 6:25 PM To: Ni, Ruiyu <ruiyu.ni@intel.com> Cc: Wu, Hao A <hao.a.wu@intel.com>; edk2-devel@lists.01.org; Leif Lindholm <leif.lindholm@linaro.org>; Tian, Feng <feng.tian@intel.com>; Zeng, Star <star.zeng@intel.com> Subject: Re: [edk2] [PATCH v2 1/2] MdeModulePkg: introduce SD/MMC override protocol On 5 December 2017 at 10:12, Ni, Ruiyu <ruiyu.ni@intel.com> wrote: > Some comments re the detailed interfaces embedded in below. > > On 11/30/2017 6:11 PM, Ard Biesheuvel wrote: >> >> Many ARM based SoCs have integrated SDHCI controllers, and often, >> these implementations deviate in subtle ways from the pertinent >> specifications. On the one hand, these deviations are quite easy to >> work around, but on the other hand, having a collection of SoC >> specific workarounds in the generic driver stack is undesirable. >> >> So let's introduce an optional SD/MMC override protocol that we can >> invoke at the appropriate moments in the device initialization. >> That way, the workaround itself remains platform specific, but we can >> still use the generic driver stack on such platforms. >> >> Contributed-under: TianoCore Contribution Agreement 1.1 >> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> >> --- >> MdeModulePkg/Include/Protocol/SdMmcOverride.h | 103 ++++++++++++++++++++ >> MdeModulePkg/MdeModulePkg.dec | 3 + >> 2 files changed, 106 insertions(+) >> >> diff --git a/MdeModulePkg/Include/Protocol/SdMmcOverride.h >> b/MdeModulePkg/Include/Protocol/SdMmcOverride.h >> new file mode 100644 >> index 000000000000..5a5c393896f4 >> --- /dev/null >> +++ b/MdeModulePkg/Include/Protocol/SdMmcOverride.h >> @@ -0,0 +1,103 @@ >> +/** @file >> + Protocol to describe overrides required to support non-standard >> +SDHCI >> + implementations >> + >> + Copyright (c) 2017, Linaro, Ltd. All rights reserved.<BR> >> + >> + This program and the accompanying materials are licensed and made >> + available under the terms and conditions of the >> BSD License >> + which accompanies this distribution. The full text of the license >> + may >> be found at >> + http://opensource.org/licenses/bsd-license.php >> + >> + THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" >> + BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER >> + EXPRESS OR >> IMPLIED. >> + >> +**/ >> + >> +#ifndef __SD_MMC_OVERRIDE_H__ >> +#define __SD_MMC_OVERRIDE_H__ >> + >> +#include <Protocol/SdMmcPassThru.h> >> + >> +#define EDKII_SD_MMC_OVERRIDE_PROTOCOL_GUID \ >> + { 0xeaf9e3c1, 0xc9cd, 0x46db, { 0xa5, 0xe5, 0x5a, 0x12, 0x4c, >> +0x83, >> 0x23, 0x23 } } >> + >> +#define EDKII_SD_MMC_OVERRIDE_PROTOCOL_VERSION 0x1 >> + >> +typedef struct _SD_MMC_OVERRIDE SD_MMC_OVERRIDE; >> + >> +typedef enum { >> + SD_MMC_OVERRIDE_RESET_PRE_HOOK, >> + SD_MMC_OVERRIDE_RESET_POST_HOOK, >> + SD_MMC_OVERRIDE_INIT_HOST_PRE_HOOK, >> + SD_MMC_OVERRIDE_INIT_HOST_POST_HOOK, > > > How about using name like "SdMmcResetPre"? Sure > Do "ResetPre"/"ResetPost" / "InitHostPre" / "InitHostPost" cover all > potential check points? > Perhaps not, but it is hard to predict the future :-) This is why I added the version field. (I should also update the second patch to reject the protocol if its version is higher than EDKII_SD_MMC_OVERRIDE_PROTOCOL_VERSION) >> +} SD_MMC_OVERRIDE_HOOK; > > How about use "SD_MMC_PHASE_TYPE"? > Sure. > >> + >> +/** >> + >> + Override function for SDHCI capability bits >> + >> + @param[in] PassThru A pointer to the >> + >> + EFI_SD_MMC_PASS_THRU_PROTOCOL >> instance. >> + @param[in] ControllerHandle The EFI_HANDLE of the controller. >> + @param[in] Slot The 0 based slot index. >> + @param[in,out] SdMmcHcSlotCapability The SDHCI capability structure. >> + >> + @retval EFI_SUCCESS The override function completed >> successfully. >> + @retval EFI_NOT_FOUND The specified controller or slot does not >> exist. >> + @retval EFI_INVALID_PARAMETER SdMmcHcSlotCapability is NULL >> + >> +**/ >> +typedef >> +EFI_STATUS >> +(EFIAPI * SD_MMC_OVERRIDE_CAPABILITY) ( > > > How about "SD_MMC_CAPABILITY"? > Sure. >> + IN EFI_SD_MMC_PASS_THRU_PROTOCOL *PassThru, >> + IN EFI_HANDLE ControllerHandle, >> + IN UINT8 Slot, >> + IN OUT UINT64 *SdMmcHcSlotCapability >> + ); > > > Is this API too specific? > Besides SlotCapability, is there any other attributes that may need > override as well? > The capability structure is the root data structure that describes the SD/MMC host controller. Which other data structures did you have in mind? >> + >> +/** >> + >> + Override function for SDHCI controller operations >> + >> + @param[in] PassThru A pointer to the >> + >> + EFI_SD_MMC_PASS_THRU_PROTOCOL >> instance. >> + @param[in] ControllerHandle The EFI_HANDLE of the controller. >> + @param[in] Slot The 0 based slot index. >> + @param[in,out] HookType The type of operation and whether >> the >> + hook is invoked right before >> (pre) or >> + right after (post) >> + >> + @retval EFI_SUCCESS The override function completed >> successfully. >> + @retval EFI_NOT_FOUND The specified controller or slot does not >> exist. >> + @retval EFI_INVALID_PARAMETER HookType is invalid >> + >> +**/ >> +typedef >> +EFI_STATUS >> +(EFIAPI * SD_MMC_OVERRIDE_INVOKE_HOOK) ( > > > How about "SD_MMC_NOTIFY_PHASE"? > Sure. >> + IN EFI_SD_MMC_PASS_THRU_PROTOCOL *PassThru, >> + IN EFI_HANDLE ControllerHandle, >> + IN UINT8 Slot, >> + IN SD_MMC_OVERRIDE_HOOK HookType >> + ); >> + >> +struct _SD_MMC_OVERRIDE { >> + // >> + // Protocol version of this implementation >> + // >> + UINTN Version; >> + // >> + // Callback to override SD/MMC host controller capability bits >> + // >> + SD_MMC_OVERRIDE_CAPABILITY OverrideCapability;How about >> "Capability"? So the caller writes code as > > "SdMmcOverride->Capability()". Sure. >> >> + // >> + // Callback to invoke SD/MMC override hooks // >> + SD_MMC_OVERRIDE_INVOKE_HOOK InvokeHook; > > How about "NotifyPhase"? Sure. >> >> +}; >> + >> +extern EFI_GUID gEdkiiSdMmcOverrideProtocolGuid; >> + >> +#endif >> diff --git a/MdeModulePkg/MdeModulePkg.dec >> b/MdeModulePkg/MdeModulePkg.dec index 856d67aceb21..64ceea029f94 >> 100644 >> --- a/MdeModulePkg/MdeModulePkg.dec >> +++ b/MdeModulePkg/MdeModulePkg.dec >> @@ -562,6 +562,9 @@ [Protocols] >> ## Include/Protocol/SmmMemoryAttribute.h >> gEdkiiSmmMemoryAttributeProtocolGuid = { 0x69b792ea, 0x39ce, >> 0x402d, { 0xa2, 0xa6, 0xf7, 0x21, 0xde, 0x35, 0x1d, 0xfe } } >> + ## Include/Protocol/SdMmcOverride.h >> + gEdkiiSdMmcOverrideProtocolGuid = { 0xeaf9e3c1, 0xc9cd, 0x46db, { >> + 0xa5, >> 0xe5, 0x5a, 0x12, 0x4c, 0x83, 0x23, 0x23 } } >> + >> # >> # [Error.gEfiMdeModulePkgTokenSpaceGuid] >> # 0x80000001 | Invalid value provided. >> > > > -- > Thanks, > Ray _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
On 12/5/2017 6:24 PM, Ard Biesheuvel wrote: > On 5 December 2017 at 10:12, Ni, Ruiyu <ruiyu.ni@intel.com> wrote: >> Some comments re the detailed interfaces embedded in below. >> >> On 11/30/2017 6:11 PM, Ard Biesheuvel wrote: >>> >>> Many ARM based SoCs have integrated SDHCI controllers, and often, >>> these implementations deviate in subtle ways from the pertinent >>> specifications. On the one hand, these deviations are quite easy >>> to work around, but on the other hand, having a collection of SoC >>> specific workarounds in the generic driver stack is undesirable. >>> >>> So let's introduce an optional SD/MMC override protocol that we >>> can invoke at the appropriate moments in the device initialization. >>> That way, the workaround itself remains platform specific, but we >>> can still use the generic driver stack on such platforms. >>> >>> Contributed-under: TianoCore Contribution Agreement 1.1 >>> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> >>> --- >>> MdeModulePkg/Include/Protocol/SdMmcOverride.h | 103 ++++++++++++++++++++ >>> MdeModulePkg/MdeModulePkg.dec | 3 + >>> 2 files changed, 106 insertions(+) >>> >>> diff --git a/MdeModulePkg/Include/Protocol/SdMmcOverride.h >>> b/MdeModulePkg/Include/Protocol/SdMmcOverride.h >>> new file mode 100644 >>> index 000000000000..5a5c393896f4 >>> --- /dev/null >>> +++ b/MdeModulePkg/Include/Protocol/SdMmcOverride.h >>> @@ -0,0 +1,103 @@ >>> +/** @file >>> + Protocol to describe overrides required to support non-standard SDHCI >>> + implementations >>> ... >>> + IN EFI_SD_MMC_PASS_THRU_PROTOCOL *PassThru, >>> + IN EFI_HANDLE ControllerHandle, >>> + IN UINT8 Slot, >>> + IN OUT UINT64 *SdMmcHcSlotCapability >>> + ); >> >> >> Is this API too specific? >> Besides SlotCapability, is there any other attributes that may need >> override as well? >> > > The capability structure is the root data structure that describes the > SD/MMC host controller. Which other data structures did you have in > mind? > I do not know either. Hao, any comments? -- Thanks, Ray _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
> -----Original Message----- > From: Ni, Ruiyu > Sent: Tuesday, December 05, 2017 6:35 PM > To: Ard Biesheuvel; Wu, Hao A > Cc: edk2-devel@lists.01.org; Leif Lindholm; Tian, Feng; Zeng, Star > Subject: Re: [edk2] [PATCH v2 1/2] MdeModulePkg: introduce SD/MMC override > protocol > > On 12/5/2017 6:24 PM, Ard Biesheuvel wrote: > > On 5 December 2017 at 10:12, Ni, Ruiyu <ruiyu.ni@intel.com> wrote: > >> Some comments re the detailed interfaces embedded in below. > >> > >> On 11/30/2017 6:11 PM, Ard Biesheuvel wrote: > >>> > >>> Many ARM based SoCs have integrated SDHCI controllers, and often, > >>> these implementations deviate in subtle ways from the pertinent > >>> specifications. On the one hand, these deviations are quite easy > >>> to work around, but on the other hand, having a collection of SoC > >>> specific workarounds in the generic driver stack is undesirable. > >>> > >>> So let's introduce an optional SD/MMC override protocol that we > >>> can invoke at the appropriate moments in the device initialization. > >>> That way, the workaround itself remains platform specific, but we > >>> can still use the generic driver stack on such platforms. > >>> > >>> Contributed-under: TianoCore Contribution Agreement 1.1 > >>> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> > >>> --- > >>> MdeModulePkg/Include/Protocol/SdMmcOverride.h | 103 > ++++++++++++++++++++ > >>> MdeModulePkg/MdeModulePkg.dec | 3 + > >>> 2 files changed, 106 insertions(+) > >>> > >>> diff --git a/MdeModulePkg/Include/Protocol/SdMmcOverride.h > >>> b/MdeModulePkg/Include/Protocol/SdMmcOverride.h > >>> new file mode 100644 > >>> index 000000000000..5a5c393896f4 > >>> --- /dev/null > >>> +++ b/MdeModulePkg/Include/Protocol/SdMmcOverride.h > >>> @@ -0,0 +1,103 @@ > >>> +/** @file > >>> + Protocol to describe overrides required to support non-standard SDHCI > >>> + implementations > >>> ... > >>> + IN EFI_SD_MMC_PASS_THRU_PROTOCOL *PassThru, > >>> + IN EFI_HANDLE ControllerHandle, > >>> + IN UINT8 Slot, > >>> + IN OUT UINT64 *SdMmcHcSlotCapability > >>> + ); > >> > >> > >> Is this API too specific? > >> Besides SlotCapability, is there any other attributes that may need > >> override as well? > >> > > > > The capability structure is the root data structure that describes the > > SD/MMC host controller. Which other data structures did you have in > > mind? > > > > I do not know either. > Hao, any comments? The service is overriding the 'Capability' field of the private data structure within the HC driver. It's the value read from the 'CAP' register of the SD/MMC HC. After a glance of the other fields in 'SD_MMC_HC_PRIVATE_DATA', maybe the 'MaxCurrent' field is another candidate can be overriden. However, I am not sure about this. Best Regards, Hao Wu > > -- > Thanks, > Ray _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
On 5 December 2017 at 13:09, Wu, Hao A <hao.a.wu@intel.com> wrote: >> -----Original Message----- >> From: Ni, Ruiyu >> Sent: Tuesday, December 05, 2017 6:35 PM >> To: Ard Biesheuvel; Wu, Hao A >> Cc: edk2-devel@lists.01.org; Leif Lindholm; Tian, Feng; Zeng, Star >> Subject: Re: [edk2] [PATCH v2 1/2] MdeModulePkg: introduce SD/MMC override >> protocol >> >> On 12/5/2017 6:24 PM, Ard Biesheuvel wrote: >> > On 5 December 2017 at 10:12, Ni, Ruiyu <ruiyu.ni@intel.com> wrote: >> >> Some comments re the detailed interfaces embedded in below. >> >> >> >> On 11/30/2017 6:11 PM, Ard Biesheuvel wrote: >> >>> >> >>> Many ARM based SoCs have integrated SDHCI controllers, and often, >> >>> these implementations deviate in subtle ways from the pertinent >> >>> specifications. On the one hand, these deviations are quite easy >> >>> to work around, but on the other hand, having a collection of SoC >> >>> specific workarounds in the generic driver stack is undesirable. >> >>> >> >>> So let's introduce an optional SD/MMC override protocol that we >> >>> can invoke at the appropriate moments in the device initialization. >> >>> That way, the workaround itself remains platform specific, but we >> >>> can still use the generic driver stack on such platforms. >> >>> >> >>> Contributed-under: TianoCore Contribution Agreement 1.1 >> >>> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> >> >>> --- >> >>> MdeModulePkg/Include/Protocol/SdMmcOverride.h | 103 >> ++++++++++++++++++++ >> >>> MdeModulePkg/MdeModulePkg.dec | 3 + >> >>> 2 files changed, 106 insertions(+) >> >>> >> >>> diff --git a/MdeModulePkg/Include/Protocol/SdMmcOverride.h >> >>> b/MdeModulePkg/Include/Protocol/SdMmcOverride.h >> >>> new file mode 100644 >> >>> index 000000000000..5a5c393896f4 >> >>> --- /dev/null >> >>> +++ b/MdeModulePkg/Include/Protocol/SdMmcOverride.h >> >>> @@ -0,0 +1,103 @@ >> >>> +/** @file >> >>> + Protocol to describe overrides required to support non-standard SDHCI >> >>> + implementations >> >>> ... >> >>> + IN EFI_SD_MMC_PASS_THRU_PROTOCOL *PassThru, >> >>> + IN EFI_HANDLE ControllerHandle, >> >>> + IN UINT8 Slot, >> >>> + IN OUT UINT64 *SdMmcHcSlotCapability >> >>> + ); >> >> >> >> >> >> Is this API too specific? >> >> Besides SlotCapability, is there any other attributes that may need >> >> override as well? >> >> >> > >> > The capability structure is the root data structure that describes the >> > SD/MMC host controller. Which other data structures did you have in >> > mind? >> > >> >> I do not know either. >> Hao, any comments? > > The service is overriding the 'Capability' field of the private data > structure within the HC driver. It's the value read from the 'CAP' > register of the SD/MMC HC. > > After a glance of the other fields in 'SD_MMC_HC_PRIVATE_DATA', maybe the > 'MaxCurrent' field is another candidate can be overriden. However, I am > not sure about this. > In my experience, trying to cover every imaginable use case upfront usually fails. That is why I used enum based hooks, which are easily expanded later if we need to. If we need to override maxcurrent later on, we can just add it. _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
diff --git a/MdeModulePkg/Include/Protocol/SdMmcOverride.h b/MdeModulePkg/Include/Protocol/SdMmcOverride.h new file mode 100644 index 000000000000..5a5c393896f4 --- /dev/null +++ b/MdeModulePkg/Include/Protocol/SdMmcOverride.h @@ -0,0 +1,103 @@ +/** @file + Protocol to describe overrides required to support non-standard SDHCI + implementations + + Copyright (c) 2017, Linaro, Ltd. All rights reserved.<BR> + + This program and the accompanying materials + are licensed and made available under the terms and conditions of the BSD License + which accompanies this distribution. The full text of the license may be found at + http://opensource.org/licenses/bsd-license.php + + THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, + WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. + +**/ + +#ifndef __SD_MMC_OVERRIDE_H__ +#define __SD_MMC_OVERRIDE_H__ + +#include <Protocol/SdMmcPassThru.h> + +#define EDKII_SD_MMC_OVERRIDE_PROTOCOL_GUID \ + { 0xeaf9e3c1, 0xc9cd, 0x46db, { 0xa5, 0xe5, 0x5a, 0x12, 0x4c, 0x83, 0x23, 0x23 } } + +#define EDKII_SD_MMC_OVERRIDE_PROTOCOL_VERSION 0x1 + +typedef struct _SD_MMC_OVERRIDE SD_MMC_OVERRIDE; + +typedef enum { + SD_MMC_OVERRIDE_RESET_PRE_HOOK, + SD_MMC_OVERRIDE_RESET_POST_HOOK, + SD_MMC_OVERRIDE_INIT_HOST_PRE_HOOK, + SD_MMC_OVERRIDE_INIT_HOST_POST_HOOK, +} SD_MMC_OVERRIDE_HOOK; + +/** + + Override function for SDHCI capability bits + + @param[in] PassThru A pointer to the + EFI_SD_MMC_PASS_THRU_PROTOCOL instance. + @param[in] ControllerHandle The EFI_HANDLE of the controller. + @param[in] Slot The 0 based slot index. + @param[in,out] SdMmcHcSlotCapability The SDHCI capability structure. + + @retval EFI_SUCCESS The override function completed successfully. + @retval EFI_NOT_FOUND The specified controller or slot does not exist. + @retval EFI_INVALID_PARAMETER SdMmcHcSlotCapability is NULL + +**/ +typedef +EFI_STATUS +(EFIAPI * SD_MMC_OVERRIDE_CAPABILITY) ( + IN EFI_SD_MMC_PASS_THRU_PROTOCOL *PassThru, + IN EFI_HANDLE ControllerHandle, + IN UINT8 Slot, + IN OUT UINT64 *SdMmcHcSlotCapability + ); + +/** + + Override function for SDHCI controller operations + + @param[in] PassThru A pointer to the + EFI_SD_MMC_PASS_THRU_PROTOCOL instance. + @param[in] ControllerHandle The EFI_HANDLE of the controller. + @param[in] Slot The 0 based slot index. + @param[in,out] HookType The type of operation and whether the + hook is invoked right before (pre) or + right after (post) + + @retval EFI_SUCCESS The override function completed successfully. + @retval EFI_NOT_FOUND The specified controller or slot does not exist. + @retval EFI_INVALID_PARAMETER HookType is invalid + +**/ +typedef +EFI_STATUS +(EFIAPI * SD_MMC_OVERRIDE_INVOKE_HOOK) ( + IN EFI_SD_MMC_PASS_THRU_PROTOCOL *PassThru, + IN EFI_HANDLE ControllerHandle, + IN UINT8 Slot, + IN SD_MMC_OVERRIDE_HOOK HookType + ); + +struct _SD_MMC_OVERRIDE { + // + // Protocol version of this implementation + // + UINTN Version; + // + // Callback to override SD/MMC host controller capability bits + // + SD_MMC_OVERRIDE_CAPABILITY OverrideCapability; + // + // Callback to invoke SD/MMC override hooks + // + SD_MMC_OVERRIDE_INVOKE_HOOK InvokeHook; +}; + +extern EFI_GUID gEdkiiSdMmcOverrideProtocolGuid; + +#endif diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec index 856d67aceb21..64ceea029f94 100644 --- a/MdeModulePkg/MdeModulePkg.dec +++ b/MdeModulePkg/MdeModulePkg.dec @@ -562,6 +562,9 @@ [Protocols] ## Include/Protocol/SmmMemoryAttribute.h gEdkiiSmmMemoryAttributeProtocolGuid = { 0x69b792ea, 0x39ce, 0x402d, { 0xa2, 0xa6, 0xf7, 0x21, 0xde, 0x35, 0x1d, 0xfe } } + ## Include/Protocol/SdMmcOverride.h + gEdkiiSdMmcOverrideProtocolGuid = { 0xeaf9e3c1, 0xc9cd, 0x46db, { 0xa5, 0xe5, 0x5a, 0x12, 0x4c, 0x83, 0x23, 0x23 } } + # # [Error.gEfiMdeModulePkgTokenSpaceGuid] # 0x80000001 | Invalid value provided.
Many ARM based SoCs have integrated SDHCI controllers, and often, these implementations deviate in subtle ways from the pertinent specifications. On the one hand, these deviations are quite easy to work around, but on the other hand, having a collection of SoC specific workarounds in the generic driver stack is undesirable. So let's introduce an optional SD/MMC override protocol that we can invoke at the appropriate moments in the device initialization. That way, the workaround itself remains platform specific, but we can still use the generic driver stack on such platforms. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> --- MdeModulePkg/Include/Protocol/SdMmcOverride.h | 103 ++++++++++++++++++++ MdeModulePkg/MdeModulePkg.dec | 3 + 2 files changed, 106 insertions(+) -- 2.11.0 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel