Re: [PATCH 29/45] drm/msm/dp: skip reading the EDID for MST cases

[Dmitry Baryshkov]

On Thu, Dec 05, 2024 at 08:32:00PM -0800, Abhinav Kumar wrote:
> For MST cases, EDID is handled through AUX sideband messaging.
> Skip the EDID read during hotplug handle for MST cases.

But why? Isn't EDID being read at the hotplug time to update
drm_connector's data?

> 
> Signed-off-by: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>
> ---
>  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 033d238e956263c1212fce45aab01316ef341edb..a67bc7c1b83a5a9996435804ff7337f72dae93a0 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -420,9 +420,11 @@ 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->max_stream <= DEFAULT_STREAM_COUNT || !msm_dp_panel_read_mst_cap(dp->panel)) {
> +		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