Re: [PATCH] Revert "drm/bridge: lt9611: Do not generate HFP/HBP/HSA and EOT packet"

[Dmitry Baryshkov]

On 02/08/2023 11:52, Neil Armstrong wrote:
> This reverts commit [1] to fix display regression on the Dragonboard 845c
> (SDM845) devboard.
>
> There's a mismatch on the real action of the following flags:
> - MIPI_DSI_MODE_VIDEO_NO_HSA
> - MIPI_DSI_MODE_VIDEO_NO_HFP
> - MIPI_DSI_MODE_VIDEO_NO_HBP
> which leads to a non-working display on qcom platforms.
>
> [1] 8ddce13ae696 ("drm/bridge: lt9611: Do not generate HFP/HBP/HSA and EOT packet")
>
> Cc: Marek Vasut <marex@xxxxxxx>
> Cc: Robert Foss <rfoss@xxxxxxxxxx>
> Cc: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>
> Cc: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
> Cc: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>
> Fixes: 8ddce13ae69 ("drm/bridge: lt9611: Do not generate HFP/HBP/HSA and EOT packet")
> Reported-by: Amit Pundir <amit.pundir@xxxxxxxxxx>
> Link: https://lore.kernel.org/r/CAMi1Hd0TD=2z_=bcDrht3H_wiLvAFcv8Z-U_r_KUOoeMc6UMjw@xxxxxxxxxxxxxx/
> Signed-off-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
> ---
>   drivers/gpu/drm/bridge/lontium-lt9611.c | 4 +---
>   1 file changed, 1 insertion(+), 3 deletions(-)
Acked-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx> #fix db845c

The boards broken by [1] are used in production by different parties 
since 5.10, breaking them doesn't seem more acceptable than breaking the 
new out-of-tree iMX8m hardware.

--
With best wishes
Dmitry