| Message ID | 20250124105309.295769-5-quic_vdadhani@quicinc.com |
|---|---|
| State | New |
| Headers | show |
| Series | Add support to load QUP SE firmware from | expand |
On 24/01/2025 11:53, Viken Dadhaniya wrote: > Data transfer mode is fixed by TrustZone (TZ), which currently restricts > developers from modifying the transfer mode from the APPS side. > > Document the 'qcom,xfer-mode' properties to select the data transfer mode, > either GPI DMA (Generic Packet Interface) or non-GPI mode (PIO/CPU DMA). > > UART controller can operate in one of two modes based on the > 'qcom,xfer-mode' property, and the firmware is loaded accordingly. > > Co-developed-by: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com> > Signed-off-by: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com> > Signed-off-by: Viken Dadhaniya <quic_vdadhani@quicinc.com> > --- > > v1 -> v2: > > - Drop 'qcom,load-firmware' property and add 'firmware-name' property in > qup common driver. > - Update commit log. > > v1 Link: https://lore.kernel.org/linux-kernel/20241204150326.1470749-4-quic_vdadhani@quicinc.com/ > --- > --- > .../devicetree/bindings/serial/qcom,serial-geni-qcom.yaml | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml > index dd33794b3534..383773b32e47 100644 > --- a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml > +++ b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml > @@ -56,6 +56,13 @@ properties: > reg: > maxItems: 1 > > + qcom,xfer-mode: > + description: Set the value to 1 for non-GPI (FIFO/CPU DMA) mode and 3 for GPI DMA mode. > + The default mode is FIFO. > + $ref: /schemas/types.yaml#/definitions/uint32 > + enum: [1, 3] > + > + Just one blank line, but anyway, this property should not be in three places. Do you really expect that each of serial engines within one GeniQUP will be configured differently by TZ? Best regards, Krzysztof
On Mon, Jan 27, 2025 at 08:02:12AM +0100, Krzysztof Kozlowski wrote: > On 24/01/2025 11:53, Viken Dadhaniya wrote: > > Data transfer mode is fixed by TrustZone (TZ), which currently restricts > > developers from modifying the transfer mode from the APPS side. > > > > Document the 'qcom,xfer-mode' properties to select the data transfer mode, > > either GPI DMA (Generic Packet Interface) or non-GPI mode (PIO/CPU DMA). > > > > UART controller can operate in one of two modes based on the > > 'qcom,xfer-mode' property, and the firmware is loaded accordingly. > > > > Co-developed-by: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com> > > Signed-off-by: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com> > > Signed-off-by: Viken Dadhaniya <quic_vdadhani@quicinc.com> > > --- > > > > v1 -> v2: > > > > - Drop 'qcom,load-firmware' property and add 'firmware-name' property in > > qup common driver. > > - Update commit log. > > > > v1 Link: https://lore.kernel.org/linux-kernel/20241204150326.1470749-4-quic_vdadhani@quicinc.com/ > > --- > > --- > > .../devicetree/bindings/serial/qcom,serial-geni-qcom.yaml | 8 ++++++++ > > 1 file changed, 8 insertions(+) > > > > diff --git a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml > > index dd33794b3534..383773b32e47 100644 > > --- a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml > > +++ b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml > > @@ -56,6 +56,13 @@ properties: > > reg: > > maxItems: 1 > > > > + qcom,xfer-mode: > > + description: Set the value to 1 for non-GPI (FIFO/CPU DMA) mode and 3 for GPI DMA mode. > > + The default mode is FIFO. > > + $ref: /schemas/types.yaml#/definitions/uint32 > > + enum: [1, 3] > > + > > + > > Just one blank line, but anyway, this property should not be in three > places. Do you really expect that each of serial engines within one > GeniQUP will be configured differently by TZ? Yes, each SE is configured separately and it's quite frequent when different SEs have different DMA configuration.
On 27/01/2025 15:27, Dmitry Baryshkov wrote: > On Mon, Jan 27, 2025 at 08:02:12AM +0100, Krzysztof Kozlowski wrote: >> On 24/01/2025 11:53, Viken Dadhaniya wrote: >>> Data transfer mode is fixed by TrustZone (TZ), which currently restricts >>> developers from modifying the transfer mode from the APPS side. >>> >>> Document the 'qcom,xfer-mode' properties to select the data transfer mode, >>> either GPI DMA (Generic Packet Interface) or non-GPI mode (PIO/CPU DMA). >>> >>> UART controller can operate in one of two modes based on the >>> 'qcom,xfer-mode' property, and the firmware is loaded accordingly. >>> >>> Co-developed-by: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com> >>> Signed-off-by: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com> >>> Signed-off-by: Viken Dadhaniya <quic_vdadhani@quicinc.com> >>> --- >>> >>> v1 -> v2: >>> >>> - Drop 'qcom,load-firmware' property and add 'firmware-name' property in >>> qup common driver. >>> - Update commit log. >>> >>> v1 Link: https://lore.kernel.org/linux-kernel/20241204150326.1470749-4-quic_vdadhani@quicinc.com/ >>> --- >>> --- >>> .../devicetree/bindings/serial/qcom,serial-geni-qcom.yaml | 8 ++++++++ >>> 1 file changed, 8 insertions(+) >>> >>> diff --git a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml >>> index dd33794b3534..383773b32e47 100644 >>> --- a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml >>> +++ b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml >>> @@ -56,6 +56,13 @@ properties: >>> reg: >>> maxItems: 1 >>> >>> + qcom,xfer-mode: >>> + description: Set the value to 1 for non-GPI (FIFO/CPU DMA) mode and 3 for GPI DMA mode. >>> + The default mode is FIFO. >>> + $ref: /schemas/types.yaml#/definitions/uint32 >>> + enum: [1, 3] >>> + >>> + >> >> Just one blank line, but anyway, this property should not be in three >> places. Do you really expect that each of serial engines within one >> GeniQUP will be configured differently by TZ? > > Yes, each SE is configured separately and it's quite frequent when > different SEs have different DMA configuration. Well, I checked at sm8550 and sm8650 and each pair of SE - which shares resources - has the same DMAs, so I would not call it frequent. Care to bring an example where same serial engines have different DMAs and different TZ? We do not talk about single QUP. Anyway, if you need property per node, this has to be shared schema. Best regards, Krzysztof
On 27.01.2025 5:24 PM, Krzysztof Kozlowski wrote: > On 27/01/2025 15:27, Dmitry Baryshkov wrote: >> On Mon, Jan 27, 2025 at 08:02:12AM +0100, Krzysztof Kozlowski wrote: >>> On 24/01/2025 11:53, Viken Dadhaniya wrote: >>>> Data transfer mode is fixed by TrustZone (TZ), which currently restricts >>>> developers from modifying the transfer mode from the APPS side. >>>> >>>> Document the 'qcom,xfer-mode' properties to select the data transfer mode, >>>> either GPI DMA (Generic Packet Interface) or non-GPI mode (PIO/CPU DMA). >>>> >>>> UART controller can operate in one of two modes based on the >>>> 'qcom,xfer-mode' property, and the firmware is loaded accordingly. >>>> >>>> Co-developed-by: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com> >>>> Signed-off-by: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com> >>>> Signed-off-by: Viken Dadhaniya <quic_vdadhani@quicinc.com> >>>> --- >>>> >>>> v1 -> v2: >>>> >>>> - Drop 'qcom,load-firmware' property and add 'firmware-name' property in >>>> qup common driver. >>>> - Update commit log. >>>> >>>> v1 Link: https://lore.kernel.org/linux-kernel/20241204150326.1470749-4-quic_vdadhani@quicinc.com/ >>>> --- >>>> --- >>>> .../devicetree/bindings/serial/qcom,serial-geni-qcom.yaml | 8 ++++++++ >>>> 1 file changed, 8 insertions(+) >>>> >>>> diff --git a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml >>>> index dd33794b3534..383773b32e47 100644 >>>> --- a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml >>>> +++ b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml >>>> @@ -56,6 +56,13 @@ properties: >>>> reg: >>>> maxItems: 1 >>>> >>>> + qcom,xfer-mode: >>>> + description: Set the value to 1 for non-GPI (FIFO/CPU DMA) mode and 3 for GPI DMA mode. >>>> + The default mode is FIFO. >>>> + $ref: /schemas/types.yaml#/definitions/uint32 >>>> + enum: [1, 3] >>>> + >>>> + >>> >>> Just one blank line, but anyway, this property should not be in three >>> places. Do you really expect that each of serial engines within one >>> GeniQUP will be configured differently by TZ? >> >> Yes, each SE is configured separately and it's quite frequent when >> different SEs have different DMA configuration. > > Well, I checked at sm8550 and sm8650 and each pair of SE - which shares > resources - has the same DMAs, so I would not call it frequent. Care to > bring an example where same serial engines have different DMAs and > different TZ? We do not talk about single QUP. > > Anyway, if you need property per node, this has to be shared schema. I'd rather ask a different question.. Is there *any* reason to not use DMA for protocols that support it? Konrad
On 27.01.2025 6:50 PM, Konrad Dybcio wrote: > On 27.01.2025 5:24 PM, Krzysztof Kozlowski wrote: >> On 27/01/2025 15:27, Dmitry Baryshkov wrote: >>> On Mon, Jan 27, 2025 at 08:02:12AM +0100, Krzysztof Kozlowski wrote: >>>> On 24/01/2025 11:53, Viken Dadhaniya wrote: >>>>> Data transfer mode is fixed by TrustZone (TZ), which currently restricts >>>>> developers from modifying the transfer mode from the APPS side. >>>>> >>>>> Document the 'qcom,xfer-mode' properties to select the data transfer mode, >>>>> either GPI DMA (Generic Packet Interface) or non-GPI mode (PIO/CPU DMA). >>>>> >>>>> UART controller can operate in one of two modes based on the >>>>> 'qcom,xfer-mode' property, and the firmware is loaded accordingly. >>>>> >>>>> Co-developed-by: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com> >>>>> Signed-off-by: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com> >>>>> Signed-off-by: Viken Dadhaniya <quic_vdadhani@quicinc.com> >>>>> --- >>>>> >>>>> v1 -> v2: >>>>> >>>>> - Drop 'qcom,load-firmware' property and add 'firmware-name' property in >>>>> qup common driver. >>>>> - Update commit log. >>>>> >>>>> v1 Link: https://lore.kernel.org/linux-kernel/20241204150326.1470749-4-quic_vdadhani@quicinc.com/ >>>>> --- >>>>> --- >>>>> .../devicetree/bindings/serial/qcom,serial-geni-qcom.yaml | 8 ++++++++ >>>>> 1 file changed, 8 insertions(+) >>>>> >>>>> diff --git a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml >>>>> index dd33794b3534..383773b32e47 100644 >>>>> --- a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml >>>>> +++ b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml >>>>> @@ -56,6 +56,13 @@ properties: >>>>> reg: >>>>> maxItems: 1 >>>>> >>>>> + qcom,xfer-mode: >>>>> + description: Set the value to 1 for non-GPI (FIFO/CPU DMA) mode and 3 for GPI DMA mode. >>>>> + The default mode is FIFO. >>>>> + $ref: /schemas/types.yaml#/definitions/uint32 >>>>> + enum: [1, 3] >>>>> + >>>>> + >>>> >>>> Just one blank line, but anyway, this property should not be in three >>>> places. Do you really expect that each of serial engines within one >>>> GeniQUP will be configured differently by TZ? >>> >>> Yes, each SE is configured separately and it's quite frequent when >>> different SEs have different DMA configuration. >> >> Well, I checked at sm8550 and sm8650 and each pair of SE - which shares >> resources - has the same DMAs, so I would not call it frequent. Care to >> bring an example where same serial engines have different DMAs and >> different TZ? We do not talk about single QUP. >> >> Anyway, if you need property per node, this has to be shared schema. > > I'd rather ask a different question.. Is there *any* reason to not use > DMA for protocols that support it? If not, we can simplify this to: xfer_mode = protocol == PROTOCOL_UART ? XFER_FIFO : XFER_DMA Konrad
On Mon, Jan 27, 2025 at 05:24:21PM +0100, Krzysztof Kozlowski wrote: > On 27/01/2025 15:27, Dmitry Baryshkov wrote: > > On Mon, Jan 27, 2025 at 08:02:12AM +0100, Krzysztof Kozlowski wrote: > >> On 24/01/2025 11:53, Viken Dadhaniya wrote: > >>> Data transfer mode is fixed by TrustZone (TZ), which currently restricts > >>> developers from modifying the transfer mode from the APPS side. > >>> > >>> Document the 'qcom,xfer-mode' properties to select the data transfer mode, > >>> either GPI DMA (Generic Packet Interface) or non-GPI mode (PIO/CPU DMA). > >>> > >>> UART controller can operate in one of two modes based on the > >>> 'qcom,xfer-mode' property, and the firmware is loaded accordingly. > >>> > >>> Co-developed-by: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com> > >>> Signed-off-by: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com> > >>> Signed-off-by: Viken Dadhaniya <quic_vdadhani@quicinc.com> > >>> --- > >>> > >>> v1 -> v2: > >>> > >>> - Drop 'qcom,load-firmware' property and add 'firmware-name' property in > >>> qup common driver. > >>> - Update commit log. > >>> > >>> v1 Link: https://lore.kernel.org/linux-kernel/20241204150326.1470749-4-quic_vdadhani@quicinc.com/ > >>> --- > >>> --- > >>> .../devicetree/bindings/serial/qcom,serial-geni-qcom.yaml | 8 ++++++++ > >>> 1 file changed, 8 insertions(+) > >>> > >>> diff --git a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml > >>> index dd33794b3534..383773b32e47 100644 > >>> --- a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml > >>> +++ b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml > >>> @@ -56,6 +56,13 @@ properties: > >>> reg: > >>> maxItems: 1 > >>> > >>> + qcom,xfer-mode: > >>> + description: Set the value to 1 for non-GPI (FIFO/CPU DMA) mode and 3 for GPI DMA mode. > >>> + The default mode is FIFO. > >>> + $ref: /schemas/types.yaml#/definitions/uint32 > >>> + enum: [1, 3] > >>> + > >>> + > >> > >> Just one blank line, but anyway, this property should not be in three > >> places. Do you really expect that each of serial engines within one > >> GeniQUP will be configured differently by TZ? > > > > Yes, each SE is configured separately and it's quite frequent when > > different SEs have different DMA configuration. > > Well, I checked at sm8550 and sm8650 and each pair of SE - which shares > resources - has the same DMAs, so I would not call it frequent. Care to > bring an example where same serial engines have different DMAs and > different TZ? We do not talk about single QUP. Well, I don't have access to the latest sm8550 / sm8650 devcfg sources. I checked the RB5 ones. As far as I understand out of 14 enabled SEs only two are configured for the GSI DMA, others should use FIFO / SE DMA. Same applies to the SM8250 MTP devices. Checking the RB1 / RB2 setup also shows 3 out of 6 SEs being set for GSI. > > Anyway, if you need property per node, this has to be shared schema. > > Best regards, > Krzysztof
On 29/01/2025 03:21, Dmitry Baryshkov wrote: > On Mon, Jan 27, 2025 at 05:24:21PM +0100, Krzysztof Kozlowski wrote: >> On 27/01/2025 15:27, Dmitry Baryshkov wrote: >>> On Mon, Jan 27, 2025 at 08:02:12AM +0100, Krzysztof Kozlowski wrote: >>>> On 24/01/2025 11:53, Viken Dadhaniya wrote: >>>>> Data transfer mode is fixed by TrustZone (TZ), which currently restricts >>>>> developers from modifying the transfer mode from the APPS side. >>>>> >>>>> Document the 'qcom,xfer-mode' properties to select the data transfer mode, >>>>> either GPI DMA (Generic Packet Interface) or non-GPI mode (PIO/CPU DMA). >>>>> >>>>> UART controller can operate in one of two modes based on the >>>>> 'qcom,xfer-mode' property, and the firmware is loaded accordingly. >>>>> >>>>> Co-developed-by: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com> >>>>> Signed-off-by: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com> >>>>> Signed-off-by: Viken Dadhaniya <quic_vdadhani@quicinc.com> >>>>> --- >>>>> >>>>> v1 -> v2: >>>>> >>>>> - Drop 'qcom,load-firmware' property and add 'firmware-name' property in >>>>> qup common driver. >>>>> - Update commit log. >>>>> >>>>> v1 Link: https://lore.kernel.org/linux-kernel/20241204150326.1470749-4-quic_vdadhani@quicinc.com/ >>>>> --- >>>>> --- >>>>> .../devicetree/bindings/serial/qcom,serial-geni-qcom.yaml | 8 ++++++++ >>>>> 1 file changed, 8 insertions(+) >>>>> >>>>> diff --git a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml >>>>> index dd33794b3534..383773b32e47 100644 >>>>> --- a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml >>>>> +++ b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml >>>>> @@ -56,6 +56,13 @@ properties: >>>>> reg: >>>>> maxItems: 1 >>>>> >>>>> + qcom,xfer-mode: >>>>> + description: Set the value to 1 for non-GPI (FIFO/CPU DMA) mode and 3 for GPI DMA mode. >>>>> + The default mode is FIFO. >>>>> + $ref: /schemas/types.yaml#/definitions/uint32 >>>>> + enum: [1, 3] >>>>> + >>>>> + >>>> >>>> Just one blank line, but anyway, this property should not be in three >>>> places. Do you really expect that each of serial engines within one >>>> GeniQUP will be configured differently by TZ? >>> >>> Yes, each SE is configured separately and it's quite frequent when >>> different SEs have different DMA configuration. >> >> Well, I checked at sm8550 and sm8650 and each pair of SE - which shares >> resources - has the same DMAs, so I would not call it frequent. Care to >> bring an example where same serial engines have different DMAs and >> different TZ? We do not talk about single QUP. > > Well, I don't have access to the latest sm8550 / sm8650 devcfg sources. > I checked the RB5 ones. As far as I understand out of 14 enabled SEs > only two are configured for the GSI DMA, others should use FIFO / SE > DMA. Same applies to the SM8250 MTP devices. Checking the RB1 / RB2 > setup also shows 3 out of 6 SEs being set for GSI. But they are the same serial engines. Again, we do not talk here about QUP, but serial engines. Best regards, Krzysztof
On 29/01/2025 03:21, Dmitry Baryshkov wrote: > On Mon, Jan 27, 2025 at 05:24:21PM +0100, Krzysztof Kozlowski wrote: >> On 27/01/2025 15:27, Dmitry Baryshkov wrote: >>> On Mon, Jan 27, 2025 at 08:02:12AM +0100, Krzysztof Kozlowski wrote: >>>> On 24/01/2025 11:53, Viken Dadhaniya wrote: >>>>> Data transfer mode is fixed by TrustZone (TZ), which currently restricts >>>>> developers from modifying the transfer mode from the APPS side. >>>>> >>>>> Document the 'qcom,xfer-mode' properties to select the data transfer mode, >>>>> either GPI DMA (Generic Packet Interface) or non-GPI mode (PIO/CPU DMA). >>>>> >>>>> UART controller can operate in one of two modes based on the >>>>> 'qcom,xfer-mode' property, and the firmware is loaded accordingly. >>>>> >>>>> Co-developed-by: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com> >>>>> Signed-off-by: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com> >>>>> Signed-off-by: Viken Dadhaniya <quic_vdadhani@quicinc.com> >>>>> --- >>>>> >>>>> v1 -> v2: >>>>> >>>>> - Drop 'qcom,load-firmware' property and add 'firmware-name' property in >>>>> qup common driver. >>>>> - Update commit log. >>>>> >>>>> v1 Link: https://lore.kernel.org/linux-kernel/20241204150326.1470749-4-quic_vdadhani@quicinc.com/ >>>>> --- >>>>> --- >>>>> .../devicetree/bindings/serial/qcom,serial-geni-qcom.yaml | 8 ++++++++ >>>>> 1 file changed, 8 insertions(+) >>>>> >>>>> diff --git a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml >>>>> index dd33794b3534..383773b32e47 100644 >>>>> --- a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml >>>>> +++ b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml >>>>> @@ -56,6 +56,13 @@ properties: >>>>> reg: >>>>> maxItems: 1 >>>>> >>>>> + qcom,xfer-mode: >>>>> + description: Set the value to 1 for non-GPI (FIFO/CPU DMA) mode and 3 for GPI DMA mode. >>>>> + The default mode is FIFO. >>>>> + $ref: /schemas/types.yaml#/definitions/uint32 >>>>> + enum: [1, 3] >>>>> + >>>>> + >>>> >>>> Just one blank line, but anyway, this property should not be in three >>>> places. Do you really expect that each of serial engines within one >>>> GeniQUP will be configured differently by TZ? >>> >>> Yes, each SE is configured separately and it's quite frequent when >>> different SEs have different DMA configuration. >> >> Well, I checked at sm8550 and sm8650 and each pair of SE - which shares >> resources - has the same DMAs, so I would not call it frequent. Care to >> bring an example where same serial engines have different DMAs and >> different TZ? We do not talk about single QUP. > > Well, I don't have access to the latest sm8550 / sm8650 devcfg sources. > I checked the RB5 ones. As far as I understand out of 14 enabled SEs > only two are configured for the GSI DMA, others should use FIFO / SE > DMA. Same applies to the SM8250 MTP devices. Checking the RB1 / RB2 > setup also shows 3 out of 6 SEs being set for GSI. I think selecting GSI DMA is only for devices needs high speed streaming to the device, like the touch screen, using GSI DMA for random small access is a non-sense. But the thing is, in the TZ world the configuration was static so we had no choice of using GSI DMA when configured, but now we have the choice so we could totally reconfigure the SE with the transfer type (FIFO, SE DMA or GSI DMA) as runtime and drop this attribute. So instead of hardcoding this, add a way to dynamically select either of the 3 transfer types when firmware can be loaded from HLOS. Neil > >> >> Anyway, if you need property per node, this has to be shared schema. >> >> Best regards, >> Krzysztof >
On 1/29/2025 1:48 PM, neil.armstrong@linaro.org wrote: > On 29/01/2025 03:21, Dmitry Baryshkov wrote: >> On Mon, Jan 27, 2025 at 05:24:21PM +0100, Krzysztof Kozlowski wrote: >>> On 27/01/2025 15:27, Dmitry Baryshkov wrote: >>>> On Mon, Jan 27, 2025 at 08:02:12AM +0100, Krzysztof Kozlowski wrote: >>>>> On 24/01/2025 11:53, Viken Dadhaniya wrote: >>>>>> Data transfer mode is fixed by TrustZone (TZ), which currently >>>>>> restricts >>>>>> developers from modifying the transfer mode from the APPS side. >>>>>> >>>>>> Document the 'qcom,xfer-mode' properties to select the data >>>>>> transfer mode, >>>>>> either GPI DMA (Generic Packet Interface) or non-GPI mode (PIO/CPU >>>>>> DMA). >>>>>> >>>>>> UART controller can operate in one of two modes based on the >>>>>> 'qcom,xfer-mode' property, and the firmware is loaded accordingly. >>>>>> >>>>>> Co-developed-by: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com> >>>>>> Signed-off-by: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com> >>>>>> Signed-off-by: Viken Dadhaniya <quic_vdadhani@quicinc.com> >>>>>> --- >>>>>> >>>>>> v1 -> v2: >>>>>> >>>>>> - Drop 'qcom,load-firmware' property and add 'firmware-name' >>>>>> property in >>>>>> qup common driver. >>>>>> - Update commit log. >>>>>> >>>>>> v1 Link: >>>>>> https://lore.kernel.org/linux-kernel/20241204150326.1470749-4-quic_vdadhani@quicinc.com/ >>>>>> --- >>>>>> --- >>>>>> .../devicetree/bindings/serial/qcom,serial-geni-qcom.yaml | 8 >>>>>> ++++++++ >>>>>> 1 file changed, 8 insertions(+) >>>>>> >>>>>> diff --git >>>>>> a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml >>>>>> index dd33794b3534..383773b32e47 100644 >>>>>> --- >>>>>> a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml >>>>>> +++ >>>>>> b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml >>>>>> @@ -56,6 +56,13 @@ properties: >>>>>> reg: >>>>>> maxItems: 1 >>>>>> + qcom,xfer-mode: >>>>>> + description: Set the value to 1 for non-GPI (FIFO/CPU DMA) >>>>>> mode and 3 for GPI DMA mode. >>>>>> + The default mode is FIFO. >>>>>> + $ref: /schemas/types.yaml#/definitions/uint32 >>>>>> + enum: [1, 3] >>>>>> + >>>>>> + >>>>> >>>>> Just one blank line, but anyway, this property should not be in three >>>>> places. Do you really expect that each of serial engines within one >>>>> GeniQUP will be configured differently by TZ? >>>> >>>> Yes, each SE is configured separately and it's quite frequent when >>>> different SEs have different DMA configuration. >>> >>> Well, I checked at sm8550 and sm8650 and each pair of SE - which shares >>> resources - has the same DMAs, so I would not call it frequent. Care to >>> bring an example where same serial engines have different DMAs and >>> different TZ? We do not talk about single QUP. >> >> Well, I don't have access to the latest sm8550 / sm8650 devcfg sources. >> I checked the RB5 ones. As far as I understand out of 14 enabled SEs >> only two are configured for the GSI DMA, others should use FIFO / SE >> DMA. Same applies to the SM8250 MTP devices. Checking the RB1 / RB2 >> setup also shows 3 out of 6 SEs being set for GSI. > > I think selecting GSI DMA is only for devices needs high speed streaming > to the > device, like the touch screen, using GSI DMA for random small access is > a non-sense. > > But the thing is, in the TZ world the configuration was static so we had > no choice > of using GSI DMA when configured, but now we have the choice so we could > totally > reconfigure the SE with the transfer type (FIFO, SE DMA or GSI DMA) as > runtime and > drop this attribute. > > So instead of hardcoding this, add a way to dynamically select either of > the 3 > transfer types when firmware can be loaded from HLOS. > > Neil > Yes, GSI DMA mode is required for specific use cases only. Dynamically switching from GSI mode to non-GSI mode is neither possible nor useful. For each SE, the use case is fixed, and based on the use case, the developer can choose the mode via the device tree property. >> >>> >>> Anyway, if you need property per node, this has to be shared schema. >>> >>> Best regards, >>> Krzysztof >> >
On 09/02/2025 11:11, Viken Dadhaniya wrote: >>>>>> >>>>>> Just one blank line, but anyway, this property should not be in three >>>>>> places. Do you really expect that each of serial engines within one >>>>>> GeniQUP will be configured differently by TZ? >>>>> >>>>> Yes, each SE is configured separately and it's quite frequent when >>>>> different SEs have different DMA configuration. >>>> >>>> Well, I checked at sm8550 and sm8650 and each pair of SE - which shares >>>> resources - has the same DMAs, so I would not call it frequent. Care to >>>> bring an example where same serial engines have different DMAs and >>>> different TZ? We do not talk about single QUP. >>> >>> Well, I don't have access to the latest sm8550 / sm8650 devcfg sources. >>> I checked the RB5 ones. As far as I understand out of 14 enabled SEs >>> only two are configured for the GSI DMA, others should use FIFO / SE >>> DMA. Same applies to the SM8250 MTP devices. Checking the RB1 / RB2 >>> setup also shows 3 out of 6 SEs being set for GSI. >> >> I think selecting GSI DMA is only for devices needs high speed streaming >> to the >> device, like the touch screen, using GSI DMA for random small access is >> a non-sense. >> >> But the thing is, in the TZ world the configuration was static so we had >> no choice >> of using GSI DMA when configured, but now we have the choice so we could >> totally >> reconfigure the SE with the transfer type (FIFO, SE DMA or GSI DMA) as >> runtime and >> drop this attribute. >> >> So instead of hardcoding this, add a way to dynamically select either of >> the 3 >> transfer types when firmware can be loaded from HLOS. >> >> Neil >> > > Yes, GSI DMA mode is required for specific use cases only. > > Dynamically switching from GSI mode to non-GSI mode is neither possible > nor useful. For each SE, the use case is fixed, and based on the use > case, the developer can choose the mode via the device tree property. No, it cannot. Do not describe downstream as something set in stone. Best regards, Krzysztof
On 1/27/2025 9:54 PM, Krzysztof Kozlowski wrote: > On 27/01/2025 15:27, Dmitry Baryshkov wrote: >> On Mon, Jan 27, 2025 at 08:02:12AM +0100, Krzysztof Kozlowski wrote: >>> On 24/01/2025 11:53, Viken Dadhaniya wrote: >>>> Data transfer mode is fixed by TrustZone (TZ), which currently restricts >>>> developers from modifying the transfer mode from the APPS side. >>>> >>>> Document the 'qcom,xfer-mode' properties to select the data transfer mode, >>>> either GPI DMA (Generic Packet Interface) or non-GPI mode (PIO/CPU DMA). >>>> >>>> UART controller can operate in one of two modes based on the >>>> 'qcom,xfer-mode' property, and the firmware is loaded accordingly. >>>> >>>> Co-developed-by: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com> >>>> Signed-off-by: Mukesh Kumar Savaliya <quic_msavaliy@quicinc.com> >>>> Signed-off-by: Viken Dadhaniya <quic_vdadhani@quicinc.com> >>>> --- >>>> >>>> v1 -> v2: >>>> >>>> - Drop 'qcom,load-firmware' property and add 'firmware-name' property in >>>> qup common driver. >>>> - Update commit log. >>>> >>>> v1 Link: https://lore.kernel.org/linux-kernel/20241204150326.1470749-4-quic_vdadhani@quicinc.com/ >>>> --- >>>> --- >>>> .../devicetree/bindings/serial/qcom,serial-geni-qcom.yaml | 8 ++++++++ >>>> 1 file changed, 8 insertions(+) >>>> >>>> diff --git a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml >>>> index dd33794b3534..383773b32e47 100644 >>>> --- a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml >>>> +++ b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml >>>> @@ -56,6 +56,13 @@ properties: >>>> reg: >>>> maxItems: 1 >>>> >>>> + qcom,xfer-mode: >>>> + description: Set the value to 1 for non-GPI (FIFO/CPU DMA) mode and 3 for GPI DMA mode. >>>> + The default mode is FIFO. >>>> + $ref: /schemas/types.yaml#/definitions/uint32 >>>> + enum: [1, 3] >>>> + >>>> + >>> >>> Just one blank line, but anyway, this property should not be in three >>> places. Do you really expect that each of serial engines within one >>> GeniQUP will be configured differently by TZ? >> >> Yes, each SE is configured separately and it's quite frequent when >> different SEs have different DMA configuration. > > Well, I checked at sm8550 and sm8650 and each pair of SE - which shares > resources - has the same DMAs, so I would not call it frequent. Care to > bring an example where same serial engines have different DMAs and > different TZ? We do not talk about single QUP. > > Anyway, if you need property per node, this has to be shared schema. Yes, this property is required for each SE node. Can we use qcom,geni-se.yaml as a common YAML for the shared schema? Please suggest. > > Best regards, > Krzysztof
On 2/9/2025 3:49 PM, Krzysztof Kozlowski wrote: > On 09/02/2025 11:11, Viken Dadhaniya wrote: >>>>>>> >>>>>>> Just one blank line, but anyway, this property should not be in three >>>>>>> places. Do you really expect that each of serial engines within one >>>>>>> GeniQUP will be configured differently by TZ? >>>>>> >>>>>> Yes, each SE is configured separately and it's quite frequent when >>>>>> different SEs have different DMA configuration. >>>>> >>>>> Well, I checked at sm8550 and sm8650 and each pair of SE - which shares >>>>> resources - has the same DMAs, so I would not call it frequent. Care to >>>>> bring an example where same serial engines have different DMAs and >>>>> different TZ? We do not talk about single QUP. >>>> >>>> Well, I don't have access to the latest sm8550 / sm8650 devcfg sources. >>>> I checked the RB5 ones. As far as I understand out of 14 enabled SEs >>>> only two are configured for the GSI DMA, others should use FIFO / SE >>>> DMA. Same applies to the SM8250 MTP devices. Checking the RB1 / RB2 >>>> setup also shows 3 out of 6 SEs being set for GSI. >>> >>> I think selecting GSI DMA is only for devices needs high speed streaming >>> to the >>> device, like the touch screen, using GSI DMA for random small access is >>> a non-sense. >>> >>> But the thing is, in the TZ world the configuration was static so we had >>> no choice >>> of using GSI DMA when configured, but now we have the choice so we could >>> totally >>> reconfigure the SE with the transfer type (FIFO, SE DMA or GSI DMA) as >>> runtime and >>> drop this attribute. >>> >>> So instead of hardcoding this, add a way to dynamically select either of >>> the 3 >>> transfer types when firmware can be loaded from HLOS. >>> >>> Neil >>> >> To exactly summarize: GSI DMA and CPU DMA are mostly same performance unless we have multiprocessor systems queuing the transfers together. GSI DMA to be used when multiprocessor systems (Application processor/TZ/modem/ADSP subsystems) has use cases together. If only single subsystem or processor is using CPU DMA mode should be used. Hardware guidance and configuration suggest that CPU DMA and FIFO can be switched but GSI DMA. CPI DMA : Doesn't work with multiple subsystems. FIFO : same as CPU DMA but < 64 bytes (FIFO_SIZE) GSI_DMA: Work with multiple subsystems Overall, there will be GSI and non-GSI modes. Dynamic switching is only required in PIO mode (FIFO and CPU DMA). >> Yes, GSI DMA mode is required for specific use cases only. >> >> Dynamically switching from GSI mode to non-GSI mode is neither possible >> nor useful. For each SE, the use case is fixed, and based on the use >> case, the developer can choose the mode via the device tree property. > > No, it cannot. Do not describe downstream as something set in stone. Sorry, I am not referring to downstream but rather to the general process of mode selection. Please let us know if you need more clarity. > > Best regards, > Krzysztof
diff --git a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml index dd33794b3534..383773b32e47 100644 --- a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml +++ b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml @@ -56,6 +56,13 @@ properties: reg: maxItems: 1 + qcom,xfer-mode: + description: Set the value to 1 for non-GPI (FIFO/CPU DMA) mode and 3 for GPI DMA mode. + The default mode is FIFO. + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [1, 3] + + required: - compatible - clocks @@ -82,5 +89,6 @@ examples: interconnects = <&qup_virt MASTER_QUP_CORE_0 0 &qup_virt SLAVE_QUP_CORE_0 0>, <&gem_noc MASTER_APPSS_PROC 0 &config_noc SLAVE_QUP_0 0>; interconnect-names = "qup-core", "qup-config"; + qcom,xfer-mode = <1>; }; ...