Re: [PATCH v4 1/4] drm/msm/dp: Fix support of LTTPR initialization

From: Jessica Zhang
Date: Fri May 02 2025 - 19:02:00 EST




On 5/2/2025 2:54 PM, Dmitry Baryshkov wrote:
On Fri, May 02, 2025 at 10:41:41AM -0700, Jessica Zhang wrote:


On 4/29/2025 5:09 PM, Aleksandrs Vinarskis wrote:
Initialize LTTPR before msm_dp_panel_read_sink_caps, as DPTX shall
(re)read DPRX caps after LTTPR detection, as required by DP 2.1,
Section 3.6.7.6.1.

Fixes: 72d0af4accd9 ("drm/msm/dp: Add support for LTTPR handling")

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>
Signed-off-by: Aleksandrs Vinarskis <alex.vinarskis@xxxxxxxxx>
Tested-by: Johan Hovold <johan+linaro@xxxxxxxxxx>
Tested-by: Rob Clark <robdclark@xxxxxxxxx>

Hi Aleksandrs,

For this patch and the rest of the series:

Tested-by: Jessica Zhang <quic_jesszhan@xxxxxxxxxxx> # SA8775P

Were you testing in a setup with LTTPRs?

Hi Dmitry,

No, I have a setup with MST so I re-verified SST and MST with these changes.

Thanks,

Jessica Zhang