| Message ID | 20250217-b4-sm8750-display-v2-5-d201dcdda6a4@linaro.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v2,01/16] dt-bindings: display/msm: dsi-controller-main: Combine if:then: entries | expand |
On 17/02/2025 19:58, Dmitry Baryshkov wrote: > On Mon, Feb 17, 2025 at 05:41:26PM +0100, Krzysztof Kozlowski wrote: >> Add DisplayPort controller for Qualcomm SM8750 SoC which so far looks >> fully compatible with earlier SM8650 variant. > > As that became a question for QCS8300, does SM8750 also support exactly > two MST streams? v1.5 of DP (starting from SA8775p , then SM8650 and SM8750) support 4x MST for DPTX0 and 2x MST for DPTX1. The DP in SM8650 and SM8750 are identical, according to datasheet (v1.5.1). Best regards, Krzysztof
On Wed, Feb 19, 2025 at 06:02:20PM +0100, Krzysztof Kozlowski wrote: > On 17/02/2025 19:58, Dmitry Baryshkov wrote: > > On Mon, Feb 17, 2025 at 05:41:26PM +0100, Krzysztof Kozlowski wrote: > >> Add DisplayPort controller for Qualcomm SM8750 SoC which so far looks > >> fully compatible with earlier SM8650 variant. > > > > As that became a question for QCS8300, does SM8750 also support exactly > > two MST streams? > > v1.5 of DP (starting from SA8775p , then SM8650 and SM8750) support 4x > MST for DPTX0 and 2x MST for DPTX1. > > The DP in SM8650 and SM8750 are identical, according to datasheet (v1.5.1). Hmm. This also means that QCS8300 is compatible with SM8650. I'll let Abhinav comment here.
On 2/19/2025 9:08 AM, Dmitry Baryshkov wrote: > On Wed, Feb 19, 2025 at 06:02:20PM +0100, Krzysztof Kozlowski wrote: >> On 17/02/2025 19:58, Dmitry Baryshkov wrote: >>> On Mon, Feb 17, 2025 at 05:41:26PM +0100, Krzysztof Kozlowski wrote: >>>> Add DisplayPort controller for Qualcomm SM8750 SoC which so far looks >>>> fully compatible with earlier SM8650 variant. >>> >>> As that became a question for QCS8300, does SM8750 also support exactly >>> two MST streams? >> >> v1.5 of DP (starting from SA8775p , then SM8650 and SM8750) support 4x >> MST for DPTX0 and 2x MST for DPTX1. >> >> The DP in SM8650 and SM8750 are identical, according to datasheet (v1.5.1). > > Hmm. This also means that QCS8300 is compatible with SM8650. I'll let > Abhinav comment here. > DP version by itself is not a good measure of whether the controller can support 4 streams or not. Firstly, sm8650/sm8750 do not have a DPTX1 so we are only discussing about DP TX0. Coming to the QCS8300 Vs sm8650/sm8750, even though the DP controller version is the same, there is no HW support for more than 2 streams on sm8650/sm8750 because there are no INTF blocks to drive 4 streams. On sm8650/sm8750, only INTF_0 and INTF_3 can be used for DP. Hence 2 streams. Whereas on Monaco, we have INTF_0, INTF_3, INTF_6 and INTF_7 capable of driving DP. Hence 4 streams. Let me know if there are more questions. Thanks Abhinav
On Mon, 24 Feb 2025 at 20:59, Abhinav Kumar <quic_abhinavk@quicinc.com> wrote: > > > > On 2/19/2025 9:08 AM, Dmitry Baryshkov wrote: > > On Wed, Feb 19, 2025 at 06:02:20PM +0100, Krzysztof Kozlowski wrote: > >> On 17/02/2025 19:58, Dmitry Baryshkov wrote: > >>> On Mon, Feb 17, 2025 at 05:41:26PM +0100, Krzysztof Kozlowski wrote: > >>>> Add DisplayPort controller for Qualcomm SM8750 SoC which so far looks > >>>> fully compatible with earlier SM8650 variant. > >>> > >>> As that became a question for QCS8300, does SM8750 also support exactly > >>> two MST streams? > >> > >> v1.5 of DP (starting from SA8775p , then SM8650 and SM8750) support 4x > >> MST for DPTX0 and 2x MST for DPTX1. > >> > >> The DP in SM8650 and SM8750 are identical, according to datasheet (v1.5.1). > > > > Hmm. This also means that QCS8300 is compatible with SM8650. I'll let > > Abhinav comment here. > > > > DP version by itself is not a good measure of whether the controller can > support 4 streams or not. > > Firstly, sm8650/sm8750 do not have a DPTX1 so we are only discussing > about DP TX0. > > Coming to the QCS8300 Vs sm8650/sm8750, even though the DP controller > version is the same, there is no HW support for more than 2 streams on > sm8650/sm8750 because there are no INTF blocks to drive 4 streams. > > On sm8650/sm8750, only INTF_0 and INTF_3 can be used for DP. Hence 2 > streams. > > Whereas on Monaco, we have INTF_0, INTF_3, INTF_6 and INTF_7 capable of No idea what Monaco is, most likely it is some platform. Please use SoC names in public. > driving DP. Hence 4 streams. > > Let me know if there are more questions. How many stream clocks are present on those platforms? I'm asking because there is a small, but not non-existing difference between 'DPs are not completely compatible / the same' and 'DPs are fully compatible but different DPU blocks impose different restrictions on the number of MST streams'.
diff --git a/Documentation/devicetree/bindings/display/msm/dp-controller.yaml b/Documentation/devicetree/bindings/display/msm/dp-controller.yaml index e00b88332f2fed2fc33f6d72c5cc3d827cd7594e..a4bf9e07a28355c0391d1757fab16ebe5ff14a44 100644 --- a/Documentation/devicetree/bindings/display/msm/dp-controller.yaml +++ b/Documentation/devicetree/bindings/display/msm/dp-controller.yaml @@ -37,6 +37,10 @@ properties: - qcom,sm8450-dp - qcom,sm8550-dp - const: qcom,sm8350-dp + - items: + - enum: + - qcom,sm8750-dp + - const: qcom,sm8650-dp reg: minItems: 4
Add DisplayPort controller for Qualcomm SM8750 SoC which so far looks fully compatible with earlier SM8650 variant. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> --- Documentation/devicetree/bindings/display/msm/dp-controller.yaml | 4 ++++ 1 file changed, 4 insertions(+)