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

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Date:   Wed, 2 Aug 2023 14:28:51 +0200
From:   Marek Vasut <marex@...x.de>
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>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Jagan Teki <jagan@...rulasolutions.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        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 8/2/23 14:07, Marek Vasut wrote:
> On 8/2/23 10:52, 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>
> 
> This breaks LT9611 operation on i.MX8M Mini/Nano/Plus, so, NAK.
> 
> I am currently using this LT9611 with Linux 6.1.y

Correction, 6.1.y only with the DSIM patches backported.

> in production and this 
> is not acceptable. I also believe the correct fix is on the MSM side, 
> not on the LT9611 driver side, since MSM incorrectly implements these 
> flags.