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

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Message-ID: <5cf0e3fa-f66d-06c4-cfda-c48efd8c6508@linaro.org>
Date:   Wed, 2 Aug 2023 16:38:17 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Neil Armstrong <neil.armstrong@...aro.org>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Marek Vasut <marex@...x.de>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Jagan Teki <jagan@...rulasolutions.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Amit Pundir <amit.pundir@...aro.org>
Subject: Re: [PATCH] Revert "drm/bridge: lt9611: Do not generate HFP/HBP/HSA
 and EOT packet"

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@...x.de>
> Cc: Robert Foss <rfoss@...nel.org>
> Cc: Jagan Teki <jagan@...rulasolutions.com>
> Cc: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Cc: Abhinav Kumar <quic_abhinavk@...cinc.com>
> Fixes: 8ddce13ae69 ("drm/bridge: lt9611: Do not generate HFP/HBP/HSA and EOT packet")
> Reported-by: Amit Pundir <amit.pundir@...aro.org>
> Link: https://lore.kernel.org/r/CAMi1Hd0TD=2z_=bcDrht3H_wiLvAFcv8Z-U_r_KUOoeMc6UMjw@mail.gmail.com/
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
>   drivers/gpu/drm/bridge/lontium-lt9611.c | 4 +---
>   1 file changed, 1 insertion(+), 3 deletions(-)
>
Acked-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org> #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