| Message ID | 1647932876-23249-3-git-send-email-quic_c_sanm@quicinc.com |
|---|---|
| State | New |
| Headers | show |
| Series | USB DWC3 host wake up support from system suspend | expand |
On Tue, Mar 22, 2022 at 12:37:53PM +0530, Sandeep Maheswaram wrote: > During suspend read the status of all port and make sure the PHYs > are in the correct mode based on current speed. > Phy interrupt masks are set based on this mode. Keep track of the mode > of the HS PHY to be able to configure wakeup properly. > > Also check during suspend if any wakeup capable devices are > connected to the controller (directly or through hubs), if there > are none set a flag to indicate that the PHY is powered > down during suspend. > > Signed-off-by: Sandeep Maheswaram <quic_c_sanm@quicinc.com> > --- > drivers/usb/dwc3/core.c | 54 ++++++++++++++++++++++++++++++++++++++++--------- > 1 file changed, 45 insertions(+), 9 deletions(-) > > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c > index 1170b80..232a734 100644 > --- a/drivers/usb/dwc3/core.c > +++ b/drivers/usb/dwc3/core.c > @@ -32,12 +32,14 @@ > #include <linux/usb/gadget.h> > #include <linux/usb/of.h> > #include <linux/usb/otg.h> > +#include <linux/usb/hcd.h> > > #include "core.h" > #include "gadget.h" > #include "io.h" > > #include "debug.h" > +#include "../host/xhci.h" > > #define DWC3_DEFAULT_AUTOSUSPEND_DELAY 5000 /* ms */ > > @@ -1861,10 +1863,36 @@ static int dwc3_core_init_for_resume(struct dwc3 *dwc) > return ret; > } > > +static void dwc3_set_phy_speed_mode(struct dwc3 *dwc) > +{ > + > + int i, num_ports; > + u32 reg; > + struct usb_hcd *hcd = platform_get_drvdata(dwc->xhci); > + struct xhci_hcd *xhci_hcd = hcd_to_xhci(hcd); > + > + dwc->hs_phy_mode = 0; > + > + reg = readl(&xhci_hcd->cap_regs->hcs_params1); > + > + num_ports = HCS_MAX_PORTS(reg); > + for (i = 0; i < num_ports; i++) { > + reg = readl(&xhci_hcd->op_regs->port_status_base + i * 0x04); s/0x04/NUM_PORT_REGS/ > + if (reg & PORT_PE) { > + if (DEV_HIGHSPEED(reg) || DEV_FULLSPEED(reg)) > + dwc->hs_phy_mode |= PHY_MODE_USB_HOST_HS; > + else if (DEV_LOWSPEED(reg)) > + dwc->hs_phy_mode |= PHY_MODE_USB_HOST_LS; > + } > + } > + phy_set_mode(dwc->usb2_generic_phy, dwc->hs_phy_mode); > +} > + > static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) > { > unsigned long flags; > u32 reg; > + struct usb_hcd *hcd = platform_get_drvdata(dwc->xhci); > > switch (dwc->current_dr_role) { > case DWC3_GCTL_PRTCAP_DEVICE: > @@ -1877,10 +1905,7 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) > dwc3_core_exit(dwc); > break; > case DWC3_GCTL_PRTCAP_HOST: > - if (!PMSG_IS_AUTO(msg)) { > - dwc3_core_exit(dwc); > - break; > - } > + dwc3_set_phy_speed_mode(dwc); > > /* Let controller to suspend HSPHY before PHY driver suspends */ > if (dwc->dis_u2_susphy_quirk || > @@ -1896,6 +1921,16 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) > > phy_pm_runtime_put_sync(dwc->usb2_generic_phy); > phy_pm_runtime_put_sync(dwc->usb3_generic_phy); > + > + if (!PMSG_IS_AUTO(msg)) { > + if (device_may_wakeup(&dwc->xhci->dev) && Does the xHCI actually provide the correct information? I think Brian brought up earlier that xhci-plat always marks the xHCI as wakeup capable, regardless of whether the specific implementation actually supports wakeup. So a dwc3 without wakeup support would keep the PHY and the dwc3 active during suspend if wakeup capable devices are connected (unless the admin disabled wakeup), even though wakeup it doesn't support wakeup. Using the wakeup capability/policy of the xHCI to make decisions in the dwc3 driver might still be the best we can do with the weird driver split over 3 drivers for dwc3. Maybe the dwc3 could pass the actual capability to wake up to the xHCI through a property_entry? Then again, it's actually the 'glue' driver (dwc3-qcom) who knows about the actual wakeup capability, and not the dwc3 core/host ... > + usb_wakeup_enabled_descendants(hcd->self.root_hub)) { > + dwc->phy_power_off = false; > + } else { > + dwc->phy_power_off = true; > + dwc3_core_exit(dwc); > + } > + } > break; > case DWC3_GCTL_PRTCAP_OTG: > /* do nothing during runtime_suspend */ > @@ -1939,11 +1974,12 @@ static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg) > break; > case DWC3_GCTL_PRTCAP_HOST: > if (!PMSG_IS_AUTO(msg)) { > - ret = dwc3_core_init_for_resume(dwc); > - if (ret) > - return ret; > - dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST); > - break; > + if (dwc->phy_power_off) { nit: you could merge this with the outer if condition: if (!PMSG_IS_AUTO(msg) && dwc->phy_power_off) { it's also fine to leave as is.
On 3/23/2022 11:37 PM, Matthias Kaehlcke wrote: > On Tue, Mar 22, 2022 at 12:37:53PM +0530, Sandeep Maheswaram wrote: >> During suspend read the status of all port and make sure the PHYs >> are in the correct mode based on current speed. >> Phy interrupt masks are set based on this mode. Keep track of the mode >> of the HS PHY to be able to configure wakeup properly. >> >> Also check during suspend if any wakeup capable devices are >> connected to the controller (directly or through hubs), if there >> are none set a flag to indicate that the PHY is powered >> down during suspend. >> >> Signed-off-by: Sandeep Maheswaram <quic_c_sanm@quicinc.com> >> --- >> drivers/usb/dwc3/core.c | 54 ++++++++++++++++++++++++++++++++++++++++--------- >> 1 file changed, 45 insertions(+), 9 deletions(-) >> >> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c >> index 1170b80..232a734 100644 >> --- a/drivers/usb/dwc3/core.c >> +++ b/drivers/usb/dwc3/core.c >> @@ -32,12 +32,14 @@ >> #include <linux/usb/gadget.h> >> #include <linux/usb/of.h> >> #include <linux/usb/otg.h> >> +#include <linux/usb/hcd.h> >> >> #include "core.h" >> #include "gadget.h" >> #include "io.h" >> >> #include "debug.h" >> +#include "../host/xhci.h" >> >> #define DWC3_DEFAULT_AUTOSUSPEND_DELAY 5000 /* ms */ >> >> @@ -1861,10 +1863,36 @@ static int dwc3_core_init_for_resume(struct dwc3 *dwc) >> return ret; >> } >> >> +static void dwc3_set_phy_speed_mode(struct dwc3 *dwc) >> +{ >> + >> + int i, num_ports; >> + u32 reg; >> + struct usb_hcd *hcd = platform_get_drvdata(dwc->xhci); >> + struct xhci_hcd *xhci_hcd = hcd_to_xhci(hcd); >> + >> + dwc->hs_phy_mode = 0; >> + >> + reg = readl(&xhci_hcd->cap_regs->hcs_params1); >> + >> + num_ports = HCS_MAX_PORTS(reg); >> + for (i = 0; i < num_ports; i++) { >> + reg = readl(&xhci_hcd->op_regs->port_status_base + i * 0x04); > s/0x04/NUM_PORT_REGS/ Okay. Will update in next version. > >> + if (reg & PORT_PE) { >> + if (DEV_HIGHSPEED(reg) || DEV_FULLSPEED(reg)) >> + dwc->hs_phy_mode |= PHY_MODE_USB_HOST_HS; >> + else if (DEV_LOWSPEED(reg)) >> + dwc->hs_phy_mode |= PHY_MODE_USB_HOST_LS; >> + } >> + } >> + phy_set_mode(dwc->usb2_generic_phy, dwc->hs_phy_mode); >> +} >> + >> static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) >> { >> unsigned long flags; >> u32 reg; >> + struct usb_hcd *hcd = platform_get_drvdata(dwc->xhci); >> >> switch (dwc->current_dr_role) { >> case DWC3_GCTL_PRTCAP_DEVICE: >> @@ -1877,10 +1905,7 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) >> dwc3_core_exit(dwc); >> break; >> case DWC3_GCTL_PRTCAP_HOST: >> - if (!PMSG_IS_AUTO(msg)) { >> - dwc3_core_exit(dwc); >> - break; >> - } >> + dwc3_set_phy_speed_mode(dwc); >> >> /* Let controller to suspend HSPHY before PHY driver suspends */ >> if (dwc->dis_u2_susphy_quirk || >> @@ -1896,6 +1921,16 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) >> >> phy_pm_runtime_put_sync(dwc->usb2_generic_phy); >> phy_pm_runtime_put_sync(dwc->usb3_generic_phy); >> + >> + if (!PMSG_IS_AUTO(msg)) { >> + if (device_may_wakeup(&dwc->xhci->dev) && > Does the xHCI actually provide the correct information? I think Brian brought > up earlier that xhci-plat always marks the xHCI as wakeup capable, regardless > of whether the specific implementation actually supports wakeup. So a dwc3 > without wakeup support would keep the PHY and the dwc3 active during suspend > if wakeup capable devices are connected (unless the admin disabled wakeup), > even though wakeup it doesn't support wakeup. > > Using the wakeup capability/policy of the xHCI to make decisions in the dwc3 > driver might still be the best we can do with the weird driver split over 3 > drivers for dwc3. Maybe the dwc3 could pass the actual capability to wake up > to the xHCI through a property_entry? Then again, it's actually the 'glue' > driver (dwc3-qcom) who knows about the actual wakeup capability, and not the > dwc3 core/host ... Will check if we can do something regarding this. > >> + usb_wakeup_enabled_descendants(hcd->self.root_hub)) { >> + dwc->phy_power_off = false; >> + } else { >> + dwc->phy_power_off = true; >> + dwc3_core_exit(dwc); >> + } >> + } >> break; >> case DWC3_GCTL_PRTCAP_OTG: >> /* do nothing during runtime_suspend */ >> @@ -1939,11 +1974,12 @@ static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg) >> break; >> case DWC3_GCTL_PRTCAP_HOST: >> if (!PMSG_IS_AUTO(msg)) { >> - ret = dwc3_core_init_for_resume(dwc); >> - if (ret) >> - return ret; >> - dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST); >> - break; >> + if (dwc->phy_power_off) { > nit: you could merge this with the outer if condition: > > if (!PMSG_IS_AUTO(msg) && dwc->phy_power_off) { > > it's also fine to leave as is. Okay. Will update in next version.
Hi Sandeep/Matthias, On Thu, Mar 24, 2022 at 10:24:55AM +0530, Sandeep Maheswaram (Temp) wrote: > > On 3/23/2022 11:37 PM, Matthias Kaehlcke wrote: > >On Tue, Mar 22, 2022 at 12:37:53PM +0530, Sandeep Maheswaram wrote: > >>During suspend read the status of all port and make sure the PHYs > >>are in the correct mode based on current speed. > >>Phy interrupt masks are set based on this mode. Keep track of the mode > >>of the HS PHY to be able to configure wakeup properly. > >> > >>Also check during suspend if any wakeup capable devices are > >>connected to the controller (directly or through hubs), if there > >>are none set a flag to indicate that the PHY is powered > >>down during suspend. > >> > >>Signed-off-by: Sandeep Maheswaram <quic_c_sanm@quicinc.com> > >>--- > >> drivers/usb/dwc3/core.c | 54 ++++++++++++++++++++++++++++++++++++++++--------- > >> 1 file changed, 45 insertions(+), 9 deletions(-) > >> > >>diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c > >>index 1170b80..232a734 100644 > >>--- a/drivers/usb/dwc3/core.c > >>+++ b/drivers/usb/dwc3/core.c > >>@@ -32,12 +32,14 @@ > >> #include <linux/usb/gadget.h> > >> #include <linux/usb/of.h> > >> #include <linux/usb/otg.h> > >>+#include <linux/usb/hcd.h> > >> #include "core.h" > >> #include "gadget.h" > >> #include "io.h" > >> #include "debug.h" > >>+#include "../host/xhci.h" > >> #define DWC3_DEFAULT_AUTOSUSPEND_DELAY 5000 /* ms */ > >>@@ -1861,10 +1863,36 @@ static int dwc3_core_init_for_resume(struct dwc3 *dwc) > >> return ret; > >> } > >>+static void dwc3_set_phy_speed_mode(struct dwc3 *dwc) > >>+{ > >>+ > >>+ int i, num_ports; > >>+ u32 reg; > >>+ struct usb_hcd *hcd = platform_get_drvdata(dwc->xhci); > >>+ struct xhci_hcd *xhci_hcd = hcd_to_xhci(hcd); > >>+ > >>+ dwc->hs_phy_mode = 0; > >>+ > >>+ reg = readl(&xhci_hcd->cap_regs->hcs_params1); > >>+ > >>+ num_ports = HCS_MAX_PORTS(reg); > >>+ for (i = 0; i < num_ports; i++) { > >>+ reg = readl(&xhci_hcd->op_regs->port_status_base + i * 0x04); > >s/0x04/NUM_PORT_REGS/ > Okay. Will update in next version. > > > >>+ if (reg & PORT_PE) { > >>+ if (DEV_HIGHSPEED(reg) || DEV_FULLSPEED(reg)) > >>+ dwc->hs_phy_mode |= PHY_MODE_USB_HOST_HS; > >>+ else if (DEV_LOWSPEED(reg)) > >>+ dwc->hs_phy_mode |= PHY_MODE_USB_HOST_LS; > >>+ } > >>+ } > >>+ phy_set_mode(dwc->usb2_generic_phy, dwc->hs_phy_mode); > >>+} > >>+ > >> static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) > >> { > >> unsigned long flags; > >> u32 reg; > >>+ struct usb_hcd *hcd = platform_get_drvdata(dwc->xhci); > >> switch (dwc->current_dr_role) { > >> case DWC3_GCTL_PRTCAP_DEVICE: > >>@@ -1877,10 +1905,7 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) > >> dwc3_core_exit(dwc); > >> break; > >> case DWC3_GCTL_PRTCAP_HOST: > >>- if (!PMSG_IS_AUTO(msg)) { > >>- dwc3_core_exit(dwc); > >>- break; > >>- } > >>+ dwc3_set_phy_speed_mode(dwc); > >> /* Let controller to suspend HSPHY before PHY driver suspends */ > >> if (dwc->dis_u2_susphy_quirk || > >>@@ -1896,6 +1921,16 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) > >> phy_pm_runtime_put_sync(dwc->usb2_generic_phy); > >> phy_pm_runtime_put_sync(dwc->usb3_generic_phy); > >>+ > >>+ if (!PMSG_IS_AUTO(msg)) { > >>+ if (device_may_wakeup(&dwc->xhci->dev) && > >Does the xHCI actually provide the correct information? I think Brian brought > >up earlier that xhci-plat always marks the xHCI as wakeup capable, regardless > >of whether the specific implementation actually supports wakeup. So a dwc3 > >without wakeup support would keep the PHY and the dwc3 active during suspend > >if wakeup capable devices are connected (unless the admin disabled wakeup), > >even though wakeup it doesn't support wakeup. > > > >Using the wakeup capability/policy of the xHCI to make decisions in the dwc3 > >driver might still be the best we can do with the weird driver split over 3 > >drivers for dwc3. Maybe the dwc3 could pass the actual capability to wake up > >to the xHCI through a property_entry? Then again, it's actually the 'glue' > >driver (dwc3-qcom) who knows about the actual wakeup capability, and not the > >dwc3 core/host ... > Will check if we can do something regarding this. Can we introduce a device tree param to xhci-plat to specify if the underlying device is wakeup capable or not. Based on this xhci-plat can call device_set_wakeup_capable() with correct argument. One immediate problem is that current code unconditionally calls device_set_wakeup_capable(&pdev->dev, true). So we may break existing use cases also. Given that xHC assumes that the undelying device is wakeup capable but dwc3 tearing the stack during PM suspend does not make any sense. can we atleast create a device tree param for dwc3 not to do this? Thanks, Pavan
On Wed, Mar 30, 2022 at 09:33:18AM +0530, Pavan Kondeti wrote: > Hi Sandeep/Matthias, > > On Thu, Mar 24, 2022 at 10:24:55AM +0530, Sandeep Maheswaram (Temp) wrote: > > > > On 3/23/2022 11:37 PM, Matthias Kaehlcke wrote: > > >On Tue, Mar 22, 2022 at 12:37:53PM +0530, Sandeep Maheswaram wrote: > > >>During suspend read the status of all port and make sure the PHYs > > >>are in the correct mode based on current speed. > > >>Phy interrupt masks are set based on this mode. Keep track of the mode > > >>of the HS PHY to be able to configure wakeup properly. > > >> > > >>Also check during suspend if any wakeup capable devices are > > >>connected to the controller (directly or through hubs), if there > > >>are none set a flag to indicate that the PHY is powered > > >>down during suspend. > > >> > > >>Signed-off-by: Sandeep Maheswaram <quic_c_sanm@quicinc.com> > > >>--- > > >> drivers/usb/dwc3/core.c | 54 ++++++++++++++++++++++++++++++++++++++++--------- > > >> 1 file changed, 45 insertions(+), 9 deletions(-) > > >> > > >>diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c > > >>index 1170b80..232a734 100644 > > >>--- a/drivers/usb/dwc3/core.c > > >>+++ b/drivers/usb/dwc3/core.c > > >>@@ -32,12 +32,14 @@ > > >> #include <linux/usb/gadget.h> > > >> #include <linux/usb/of.h> > > >> #include <linux/usb/otg.h> > > >>+#include <linux/usb/hcd.h> > > >> #include "core.h" > > >> #include "gadget.h" > > >> #include "io.h" > > >> #include "debug.h" > > >>+#include "../host/xhci.h" > > >> #define DWC3_DEFAULT_AUTOSUSPEND_DELAY 5000 /* ms */ > > >>@@ -1861,10 +1863,36 @@ static int dwc3_core_init_for_resume(struct dwc3 *dwc) > > >> return ret; > > >> } > > >>+static void dwc3_set_phy_speed_mode(struct dwc3 *dwc) > > >>+{ > > >>+ > > >>+ int i, num_ports; > > >>+ u32 reg; > > >>+ struct usb_hcd *hcd = platform_get_drvdata(dwc->xhci); > > >>+ struct xhci_hcd *xhci_hcd = hcd_to_xhci(hcd); > > >>+ > > >>+ dwc->hs_phy_mode = 0; > > >>+ > > >>+ reg = readl(&xhci_hcd->cap_regs->hcs_params1); > > >>+ > > >>+ num_ports = HCS_MAX_PORTS(reg); > > >>+ for (i = 0; i < num_ports; i++) { > > >>+ reg = readl(&xhci_hcd->op_regs->port_status_base + i * 0x04); > > >s/0x04/NUM_PORT_REGS/ > > Okay. Will update in next version. > > > > > >>+ if (reg & PORT_PE) { > > >>+ if (DEV_HIGHSPEED(reg) || DEV_FULLSPEED(reg)) > > >>+ dwc->hs_phy_mode |= PHY_MODE_USB_HOST_HS; > > >>+ else if (DEV_LOWSPEED(reg)) > > >>+ dwc->hs_phy_mode |= PHY_MODE_USB_HOST_LS; > > >>+ } > > >>+ } > > >>+ phy_set_mode(dwc->usb2_generic_phy, dwc->hs_phy_mode); > > >>+} > > >>+ > > >> static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) > > >> { > > >> unsigned long flags; > > >> u32 reg; > > >>+ struct usb_hcd *hcd = platform_get_drvdata(dwc->xhci); > > >> switch (dwc->current_dr_role) { > > >> case DWC3_GCTL_PRTCAP_DEVICE: > > >>@@ -1877,10 +1905,7 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) > > >> dwc3_core_exit(dwc); > > >> break; > > >> case DWC3_GCTL_PRTCAP_HOST: > > >>- if (!PMSG_IS_AUTO(msg)) { > > >>- dwc3_core_exit(dwc); > > >>- break; > > >>- } > > >>+ dwc3_set_phy_speed_mode(dwc); > > >> /* Let controller to suspend HSPHY before PHY driver suspends */ > > >> if (dwc->dis_u2_susphy_quirk || > > >>@@ -1896,6 +1921,16 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) > > >> phy_pm_runtime_put_sync(dwc->usb2_generic_phy); > > >> phy_pm_runtime_put_sync(dwc->usb3_generic_phy); > > >>+ > > >>+ if (!PMSG_IS_AUTO(msg)) { > > >>+ if (device_may_wakeup(&dwc->xhci->dev) && > > >Does the xHCI actually provide the correct information? I think Brian brought > > >up earlier that xhci-plat always marks the xHCI as wakeup capable, regardless > > >of whether the specific implementation actually supports wakeup. So a dwc3 > > >without wakeup support would keep the PHY and the dwc3 active during suspend > > >if wakeup capable devices are connected (unless the admin disabled wakeup), > > >even though wakeup it doesn't support wakeup. > > > > > >Using the wakeup capability/policy of the xHCI to make decisions in the dwc3 > > >driver might still be the best we can do with the weird driver split over 3 > > >drivers for dwc3. Maybe the dwc3 could pass the actual capability to wake up > > >to the xHCI through a property_entry? Then again, it's actually the 'glue' > > >driver (dwc3-qcom) who knows about the actual wakeup capability, and not the > > >dwc3 core/host ... > > Will check if we can do something regarding this. > > Can we introduce a device tree param to xhci-plat to specify if the underlying > device is wakeup capable or not. Based on this xhci-plat can call > device_set_wakeup_capable() with correct argument. This also came to my mind, the existing 'wakeup-source' property could be an option, I share your concern about breaking existing use cases though ... > One immediate problem is that current code unconditionally calls > device_set_wakeup_capable(&pdev->dev, true). So we may break existing use > cases also. > Given that xHC assumes that the undelying device is wakeup capable but dwc3 > tearing the stack during PM suspend does not make any sense. can we atleast > create a device tree param for dwc3 not to do this? I'm not sure I fully understand what you have in mind. Are you thinking about a parameter/property to indicate whether wakeup should be enabled for the dwc3? 'wakeup_source' could serve that purpose, it is also used by xhci-mtk.c and mtu3_host.c.
Hi Matthias, On Wed, Mar 30, 2022 at 09:46:36AM -0700, Matthias Kaehlcke wrote: > On Wed, Mar 30, 2022 at 09:33:18AM +0530, Pavan Kondeti wrote: > > Hi Sandeep/Matthias, > > > > On Thu, Mar 24, 2022 at 10:24:55AM +0530, Sandeep Maheswaram (Temp) wrote: > > > > > > On 3/23/2022 11:37 PM, Matthias Kaehlcke wrote: > > > >On Tue, Mar 22, 2022 at 12:37:53PM +0530, Sandeep Maheswaram wrote: > > > >>During suspend read the status of all port and make sure the PHYs > > > >>are in the correct mode based on current speed. > > > >>Phy interrupt masks are set based on this mode. Keep track of the mode > > > >>of the HS PHY to be able to configure wakeup properly. > > > >> > > > >>Also check during suspend if any wakeup capable devices are > > > >>connected to the controller (directly or through hubs), if there > > > >>are none set a flag to indicate that the PHY is powered > > > >>down during suspend. > > > >> > > > >>Signed-off-by: Sandeep Maheswaram <quic_c_sanm@quicinc.com> > > > >>--- > > > >> drivers/usb/dwc3/core.c | 54 ++++++++++++++++++++++++++++++++++++++++--------- > > > >> 1 file changed, 45 insertions(+), 9 deletions(-) > > > >> > > > >>diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c > > > >>index 1170b80..232a734 100644 > > > >>--- a/drivers/usb/dwc3/core.c > > > >>+++ b/drivers/usb/dwc3/core.c > > > >>@@ -32,12 +32,14 @@ > > > >> #include <linux/usb/gadget.h> > > > >> #include <linux/usb/of.h> > > > >> #include <linux/usb/otg.h> > > > >>+#include <linux/usb/hcd.h> > > > >> #include "core.h" > > > >> #include "gadget.h" > > > >> #include "io.h" > > > >> #include "debug.h" > > > >>+#include "../host/xhci.h" > > > >> #define DWC3_DEFAULT_AUTOSUSPEND_DELAY 5000 /* ms */ > > > >>@@ -1861,10 +1863,36 @@ static int dwc3_core_init_for_resume(struct dwc3 *dwc) > > > >> return ret; > > > >> } > > > >>+static void dwc3_set_phy_speed_mode(struct dwc3 *dwc) > > > >>+{ > > > >>+ > > > >>+ int i, num_ports; > > > >>+ u32 reg; > > > >>+ struct usb_hcd *hcd = platform_get_drvdata(dwc->xhci); > > > >>+ struct xhci_hcd *xhci_hcd = hcd_to_xhci(hcd); > > > >>+ > > > >>+ dwc->hs_phy_mode = 0; > > > >>+ > > > >>+ reg = readl(&xhci_hcd->cap_regs->hcs_params1); > > > >>+ > > > >>+ num_ports = HCS_MAX_PORTS(reg); > > > >>+ for (i = 0; i < num_ports; i++) { > > > >>+ reg = readl(&xhci_hcd->op_regs->port_status_base + i * 0x04); > > > >s/0x04/NUM_PORT_REGS/ > > > Okay. Will update in next version. > > > > > > > >>+ if (reg & PORT_PE) { > > > >>+ if (DEV_HIGHSPEED(reg) || DEV_FULLSPEED(reg)) > > > >>+ dwc->hs_phy_mode |= PHY_MODE_USB_HOST_HS; > > > >>+ else if (DEV_LOWSPEED(reg)) > > > >>+ dwc->hs_phy_mode |= PHY_MODE_USB_HOST_LS; > > > >>+ } > > > >>+ } > > > >>+ phy_set_mode(dwc->usb2_generic_phy, dwc->hs_phy_mode); > > > >>+} > > > >>+ > > > >> static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) > > > >> { > > > >> unsigned long flags; > > > >> u32 reg; > > > >>+ struct usb_hcd *hcd = platform_get_drvdata(dwc->xhci); > > > >> switch (dwc->current_dr_role) { > > > >> case DWC3_GCTL_PRTCAP_DEVICE: > > > >>@@ -1877,10 +1905,7 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) > > > >> dwc3_core_exit(dwc); > > > >> break; > > > >> case DWC3_GCTL_PRTCAP_HOST: > > > >>- if (!PMSG_IS_AUTO(msg)) { > > > >>- dwc3_core_exit(dwc); > > > >>- break; > > > >>- } > > > >>+ dwc3_set_phy_speed_mode(dwc); > > > >> /* Let controller to suspend HSPHY before PHY driver suspends */ > > > >> if (dwc->dis_u2_susphy_quirk || > > > >>@@ -1896,6 +1921,16 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) > > > >> phy_pm_runtime_put_sync(dwc->usb2_generic_phy); > > > >> phy_pm_runtime_put_sync(dwc->usb3_generic_phy); > > > >>+ > > > >>+ if (!PMSG_IS_AUTO(msg)) { > > > >>+ if (device_may_wakeup(&dwc->xhci->dev) && > > > >Does the xHCI actually provide the correct information? I think Brian brought > > > >up earlier that xhci-plat always marks the xHCI as wakeup capable, regardless > > > >of whether the specific implementation actually supports wakeup. So a dwc3 > > > >without wakeup support would keep the PHY and the dwc3 active during suspend > > > >if wakeup capable devices are connected (unless the admin disabled wakeup), > > > >even though wakeup it doesn't support wakeup. > > > > > > > >Using the wakeup capability/policy of the xHCI to make decisions in the dwc3 > > > >driver might still be the best we can do with the weird driver split over 3 > > > >drivers for dwc3. Maybe the dwc3 could pass the actual capability to wake up > > > >to the xHCI through a property_entry? Then again, it's actually the 'glue' > > > >driver (dwc3-qcom) who knows about the actual wakeup capability, and not the > > > >dwc3 core/host ... > > > Will check if we can do something regarding this. > > > > Can we introduce a device tree param to xhci-plat to specify if the underlying > > device is wakeup capable or not. Based on this xhci-plat can call > > device_set_wakeup_capable() with correct argument. > > This also came to my mind, the existing 'wakeup-source' property could be an > option, I share your concern about breaking existing use cases though ... > > > One immediate problem is that current code unconditionally calls > > device_set_wakeup_capable(&pdev->dev, true). So we may break existing use > > cases also. > > > Given that xHC assumes that the undelying device is wakeup capable but dwc3 > > tearing the stack during PM suspend does not make any sense. can we atleast > > create a device tree param for dwc3 not to do this? > > I'm not sure I fully understand what you have in mind. Are you thinking about > a parameter/property to indicate whether wakeup should be enabled for the dwc3? > 'wakeup_source' could serve that purpose, it is also used by xhci-mtk.c and > mtu3_host.c. Yes, I was suggesting we can have a device tree param for dwc3 node to decide instead of relying on device_may_wakeup() checks in this patch. Thanks for pointing out wakeup-source property. That sounds perfect here to me. Thanks, Pavan
Hi Sandeep, On Tue, Mar 22, 2022 at 02:02:21PM +0530, Pavan Kondeti wrote: > Hi Sandeep, > > On Tue, Mar 22, 2022 at 12:37:53PM +0530, Sandeep Maheswaram wrote: > > During suspend read the status of all port and make sure the PHYs > > are in the correct mode based on current speed. > > Phy interrupt masks are set based on this mode. Keep track of the mode > > of the HS PHY to be able to configure wakeup properly. > > > > Also check during suspend if any wakeup capable devices are > > connected to the controller (directly or through hubs), if there > > are none set a flag to indicate that the PHY is powered > > down during suspend. > > > > Signed-off-by: Sandeep Maheswaram <quic_c_sanm@quicinc.com> > > --- > > drivers/usb/dwc3/core.c | 54 ++++++++++++++++++++++++++++++++++++++++--------- > > 1 file changed, 45 insertions(+), 9 deletions(-) > > > > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c > > index 1170b80..232a734 100644 > > --- a/drivers/usb/dwc3/core.c > > +++ b/drivers/usb/dwc3/core.c > > @@ -32,12 +32,14 @@ > > #include <linux/usb/gadget.h> > > #include <linux/usb/of.h> > > #include <linux/usb/otg.h> > > +#include <linux/usb/hcd.h> > > > > #include "core.h" > > #include "gadget.h" > > #include "io.h" > > > > #include "debug.h" > > +#include "../host/xhci.h" > > > > #define DWC3_DEFAULT_AUTOSUSPEND_DELAY 5000 /* ms */ > > > > @@ -1861,10 +1863,36 @@ static int dwc3_core_init_for_resume(struct dwc3 *dwc) > > return ret; > > } > > > > +static void dwc3_set_phy_speed_mode(struct dwc3 *dwc) > > +{ > > + > > + int i, num_ports; > > + u32 reg; > > + struct usb_hcd *hcd = platform_get_drvdata(dwc->xhci); > > + struct xhci_hcd *xhci_hcd = hcd_to_xhci(hcd); > > + > > + dwc->hs_phy_mode = 0; > > + > > + reg = readl(&xhci_hcd->cap_regs->hcs_params1); > > + > > + num_ports = HCS_MAX_PORTS(reg); > > + for (i = 0; i < num_ports; i++) { > > + reg = readl(&xhci_hcd->op_regs->port_status_base + i * 0x04); > > + if (reg & PORT_PE) { > > + if (DEV_HIGHSPEED(reg) || DEV_FULLSPEED(reg)) > > + dwc->hs_phy_mode |= PHY_MODE_USB_HOST_HS; > > + else if (DEV_LOWSPEED(reg)) > > + dwc->hs_phy_mode |= PHY_MODE_USB_HOST_LS; > > + } > > + } > > + phy_set_mode(dwc->usb2_generic_phy, dwc->hs_phy_mode); > > +} > > Are these flags cleared somewhere? Also qcom-snps-hs phy driver checks > for (hsphy->mode == PHY_MODE_USB_HOST) condition in qcom_snps_hsphy_suspend > to enable auto-resume. PHY_MODE_USB_HOST_HS/PHY_MODE_USB_HOST_LS flags > are different from PHY_MODE_USB_HOST. Currently this flag is set from > __dwc3_set_mode() when entering host mode. Can you clarify your intention > in calling phy_set_mode() here. I think re-purposing phy_set_mode() to override PHY_MODE_USB_HOST with PHY_MODE_USB_HOST_HS/PHY_MODE_USB_HOST_LS might break other drivers. All most all the phy drivers are checking against PHY_MODE_USB_HOST. Why do we need to set phy_set_mode() here? The next patch in this series only uses dwc->hs_phy_mode. can we drop phy_set_mode() call here? Thanks, Pavan
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 1170b80..232a734 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -32,12 +32,14 @@ #include <linux/usb/gadget.h> #include <linux/usb/of.h> #include <linux/usb/otg.h> +#include <linux/usb/hcd.h> #include "core.h" #include "gadget.h" #include "io.h" #include "debug.h" +#include "../host/xhci.h" #define DWC3_DEFAULT_AUTOSUSPEND_DELAY 5000 /* ms */ @@ -1861,10 +1863,36 @@ static int dwc3_core_init_for_resume(struct dwc3 *dwc) return ret; } +static void dwc3_set_phy_speed_mode(struct dwc3 *dwc) +{ + + int i, num_ports; + u32 reg; + struct usb_hcd *hcd = platform_get_drvdata(dwc->xhci); + struct xhci_hcd *xhci_hcd = hcd_to_xhci(hcd); + + dwc->hs_phy_mode = 0; + + reg = readl(&xhci_hcd->cap_regs->hcs_params1); + + num_ports = HCS_MAX_PORTS(reg); + for (i = 0; i < num_ports; i++) { + reg = readl(&xhci_hcd->op_regs->port_status_base + i * 0x04); + if (reg & PORT_PE) { + if (DEV_HIGHSPEED(reg) || DEV_FULLSPEED(reg)) + dwc->hs_phy_mode |= PHY_MODE_USB_HOST_HS; + else if (DEV_LOWSPEED(reg)) + dwc->hs_phy_mode |= PHY_MODE_USB_HOST_LS; + } + } + phy_set_mode(dwc->usb2_generic_phy, dwc->hs_phy_mode); +} + static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) { unsigned long flags; u32 reg; + struct usb_hcd *hcd = platform_get_drvdata(dwc->xhci); switch (dwc->current_dr_role) { case DWC3_GCTL_PRTCAP_DEVICE: @@ -1877,10 +1905,7 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) dwc3_core_exit(dwc); break; case DWC3_GCTL_PRTCAP_HOST: - if (!PMSG_IS_AUTO(msg)) { - dwc3_core_exit(dwc); - break; - } + dwc3_set_phy_speed_mode(dwc); /* Let controller to suspend HSPHY before PHY driver suspends */ if (dwc->dis_u2_susphy_quirk || @@ -1896,6 +1921,16 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) phy_pm_runtime_put_sync(dwc->usb2_generic_phy); phy_pm_runtime_put_sync(dwc->usb3_generic_phy); + + if (!PMSG_IS_AUTO(msg)) { + if (device_may_wakeup(&dwc->xhci->dev) && + usb_wakeup_enabled_descendants(hcd->self.root_hub)) { + dwc->phy_power_off = false; + } else { + dwc->phy_power_off = true; + dwc3_core_exit(dwc); + } + } break; case DWC3_GCTL_PRTCAP_OTG: /* do nothing during runtime_suspend */ @@ -1939,11 +1974,12 @@ static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg) break; case DWC3_GCTL_PRTCAP_HOST: if (!PMSG_IS_AUTO(msg)) { - ret = dwc3_core_init_for_resume(dwc); - if (ret) - return ret; - dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST); - break; + if (dwc->phy_power_off) { + ret = dwc3_core_init_for_resume(dwc); + if (ret) + return ret; + dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST); + } } /* Restore GUSB2PHYCFG bits that were modified in suspend */ reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
During suspend read the status of all port and make sure the PHYs are in the correct mode based on current speed. Phy interrupt masks are set based on this mode. Keep track of the mode of the HS PHY to be able to configure wakeup properly. Also check during suspend if any wakeup capable devices are connected to the controller (directly or through hubs), if there are none set a flag to indicate that the PHY is powered down during suspend. Signed-off-by: Sandeep Maheswaram <quic_c_sanm@quicinc.com> --- drivers/usb/dwc3/core.c | 54 ++++++++++++++++++++++++++++++++++++++++--------- 1 file changed, 45 insertions(+), 9 deletions(-)