On Mon, Jun 09, 2025 at 08:21:45PM +0800, Yongxing Mou wrote:
> From: Abhinav Kumar <quic_abhin...@quicinc.com>
>
> For MST cases, EDID is handled through AUX sideband messaging.
> Skip the EDID read during hotplug handle for MST cases.
Why? It makes sense to read it during the HPD processing, ping HDMI
codec, update CEC info, etc.
>
> Signed-off-by: Abhinav Kumar <quic_abhin...@quicinc.com>
> Signed-off-by: Yongxing Mou <quic_yong...@quicinc.com>
> ---
> drivers/gpu/drm/msm/dp/dp_display.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c
> b/drivers/gpu/drm/msm/dp/dp_display.c
> index
> 88cae0ca66015377e59bee757462edeae5ae91bf..b1b025d1d356046f8f9e3d243fc774185df24318
> 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -438,9 +438,11 @@ static int msm_dp_display_process_hpd_high(struct
> msm_dp_display_private *dp)
> if (rc)
> goto end;
>
> - rc = msm_dp_panel_read_edid(dp->panel, connector);
> - if (rc)
> - goto end;
> + if (!dp->mst_supported || !drm_dp_read_mst_cap(dp->aux,
> dp->panel->dpcd)) {
> + rc = msm_dp_panel_read_edid(dp->panel, connector);
> + if (rc)
> + goto end;
> + }
>
> msm_dp_link_process_request(dp->link);
>
>
> --
> 2.34.1
>
--
With best wishes
Dmitry
