linux-kernel - Re: [PATCH v2, 0/4] Cooperate with DSI RX devices to modify dsi funcs and delay mipi high to cooperate with panel sequence

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Message-ID: <fb73a54a-7e75-2e5d-d78a-cacb5f065b06@collabora.com>
Date:   Fri, 4 Mar 2022 12:24:50 +0100
From:   Benjamin Gaignard <benjamin.gaignard@...labora.com>
To:     xinlei.lee@...iatek.com, chunkuang.hu@...nel.org,
        p.zabel@...gutronix.de, airlied@...ux.ie, daniel@...ll.ch,
        matthias.bgg@...il.com
Cc:     dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        jitao.shi@...iatek.com, allen-kh.cheng@...iatek.com,
        rex-bc.chen@...iatek.com
Subject: Re: [PATCH v2, 0/4] Cooperate with DSI RX devices to modify dsi funcs
 and delay mipi high to cooperate with panel sequence


Le 04/03/2022 à 11:15, xinlei.lee@...iatek.com a écrit :
> From: Xinlei Lee <xinlei.lee@...iatek.com>
>
> In upstream-v5.8, dsi_enable will operate panel_enable, but this
> modification has been moved in v5.9. In order to ensure the timing of
> dsi_power_on/off and the timing of pulling up/down the MIPI signal,
> the modification of v5.9 is synchronized in this series of patches.

Hello,

I'm trying to debug an issue on mt8183 kukui krane sku176 device.
The problem is that boe-tv101wum-nl6 panel isn't working.
At boot time I can see these logs:
panel-boe-tv101wum-nl6 14014000.dsi.0: failed to write command 1
panel-boe-tv101wum-nl6 14014000.dsi.0: failed to init panel: -62
and a DSI interrupt time out.

Since I believe the problem is link to DSI/panel enabling sequence
I have try this series but that doesn't solve the issue.
I notice that when going out of deep sleep mode panel is functional.

May you have any idea to debug/solve this problem ?

Regards,
Benjamin

>
> Changes since v1:
> 1. Dsi sequence marked with patch adjustment
> 2. Fixes: mtk_dsi: Use the drm_panel_bridge
>
> Jitao Shi (3):
>    drm/mediatek: Adjust the timing of mipi signal from LP00 to LP11
>    drm/mediatek: Separate poweron/poweroff from enable/disable and define
>      new funcs
>    drm/mediatek: keep dsi as LP00 before dcs cmds transfer
>
> Xinlei Lee (1):
>    drm/mediatek: Add pull-down MIPI operation in mtk_dsi_poweroff
>      function
>
>   drivers/gpu/drm/mediatek/mtk_dsi.c | 73 ++++++++++++++++++++----------
>   1 file changed, 49 insertions(+), 24 deletions(-)
>