Re: [PATCH v6 01/29] drm/msm/dp: move link-level teardown from display_disable to display_unprepare

[Dmitry Baryshkov]

On Mon, Aug 31, 2026 at 04:17:18PM +0800, Yongxing Mou wrote:
> From: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>
> 
> msm_dp_display_disable() currently mixes stream-level shutdown
> (disable VSC SDP, off pixel clk, clear power_on) with link-level
> teardown (PSM config when sink_count==0, off_link, PHY re-init or
> host PHY exit).
> 
> For DP MST the same link is shared across multiple streams, so
> disabling one stream must not tear down the link. Move the
> link-level steps into msm_dp_display_unprepare() so that
> display_disable() handles only the per-stream sequence, mirroring
> the split already present on the prepare path
> (display_prepare_link vs display_set_mode / display_enable).
> 
> SST behaviour is unchanged: atomic_post_disable() still calls
> display_disable() followed by display_unprepare() in the same
> order, and the cached dp->panel used inside unprepare is the same
> panel that was previously passed in.
> 
> Signed-off-by: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>
> Signed-off-by: Yongxing Mou <yongxing.mou@xxxxxxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/msm/dp/dp_display.c | 28 ++++++++++++++--------------
>  1 file changed, 14 insertions(+), 14 deletions(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>


-- 
With best wishes
Dmitry