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Date:   Fri, 4 Aug 2023 10:27:32 +0200
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From:   Neil Armstrong <neil.armstrong@linaro.org>
Reply-To: neil.armstrong@linaro.org
Subject: Re: [PATCH] Revert "drm/bridge: lt9611: Do not generate HFP/HBP/HSA
 and EOT packet"
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To:     Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Cc:     Andrzej Hajda <andrzej.hajda@intel.com>,
        Robert Foss <rfoss@kernel.org>,
        Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
        Jonas Karlman <jonas@kwiboo.se>,
        Jernej Skrabec <jernej.skrabec@gmail.com>,
        David Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>, Marek Vasut <marex@denx.de>,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
        Jagan Teki <jagan@amarulasolutions.com>,
        Abhinav Kumar <quic_abhinavk@quicinc.com>,
        Amit Pundir <amit.pundir@linaro.org>
References: <20230802-revert-do-not-generate-hfp-hbp-hsa-eot-packet-v1-1-f8a20084e15a@linaro.org>
 <CAA8EJportnT-xHFH8QP+aiomXMLbm1r=02HMB-eNDEU+JqgEoQ@mail.gmail.com>
Organization: Linaro Developer Services
In-Reply-To: <CAA8EJportnT-xHFH8QP+aiomXMLbm1r=02HMB-eNDEU+JqgEoQ@mail.gmail.com>
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On 02/08/2023 11:08, Dmitry Baryshkov wrote:
> On Wed, 2 Aug 2023 at 11:52, Neil Armstrong <neil.armstrong@linaro.org> 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")
> 
> Nit: I think the preferred form is to write `... reverts commit abcdef
> ("foo and bar")', but I might be wrong.

Yep, I'll fix all that while applying.

Thanks,
Neil

> 
> Other than that:
> 
> Acked-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> 
>>
>> Cc: Marek Vasut <marex@denx.de>
>> Cc: Robert Foss <rfoss@kernel.org>
>> Cc: Jagan Teki <jagan@amarulasolutions.com>
>> Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
>> Cc: Abhinav Kumar <quic_abhinavk@quicinc.com>
>> Fixes: 8ddce13ae69 ("drm/bridge: lt9611: Do not generate HFP/HBP/HSA and EOT packet")
>> Reported-by: Amit Pundir <amit.pundir@linaro.org>
>> Link: https://lore.kernel.org/r/CAMi1Hd0TD=2z_=bcDrht3H_wiLvAFcv8Z-U_r_KUOoeMc6UMjw@mail.gmail.com/
>> Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
>> ---
>>   drivers/gpu/drm/bridge/lontium-lt9611.c | 4 +---
>>   1 file changed, 1 insertion(+), 3 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/bridge/lontium-lt9611.c
>> index 5163e5224aad..9663601ce098 100644
>> --- a/drivers/gpu/drm/bridge/lontium-lt9611.c
>> +++ b/drivers/gpu/drm/bridge/lontium-lt9611.c
>> @@ -774,9 +774,7 @@ static struct mipi_dsi_device *lt9611_attach_dsi(struct lt9611 *lt9611,
>>          dsi->lanes = 4;
>>          dsi->format = MIPI_DSI_FMT_RGB888;
>>          dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
>> -                         MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_VIDEO_NO_HSA |
>> -                         MIPI_DSI_MODE_VIDEO_NO_HFP | MIPI_DSI_MODE_VIDEO_NO_HBP |
>> -                         MIPI_DSI_MODE_NO_EOT_PACKET;
>> +                         MIPI_DSI_MODE_VIDEO_HSE;
>>
>>          ret = devm_mipi_dsi_attach(dev, dsi);
>>          if (ret < 0) {
>>
>> ---
>> base-commit: f590814603bf2dd8620584b7d59ae94d7c186c69
>> change-id: 20230802-revert-do-not-generate-hfp-hbp-hsa-eot-packet-6f042b1ba813
>>
>> Best regards,
>> --
>> Neil Armstrong <neil.armstrong@linaro.org>
>>
> 
>