On Mon, 24 Feb 2025 at 20:59, Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx> 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'. -- With best wishes Dmitry
