linux-kernel - Re: [PATCH v7,3/4] drm/mediatek: keep dsi as LP00 before dcs cmds transfer

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Date:   Fri, 20 May 2022 11:17:36 +0800
From:   Rex-BC Chen <rex-bc.chen@...iatek.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>,
        "# 5 . 10 . x : b255d51e3967 : sched : Modify dsi funcs to atomic 
        operations" <stable@...r.kernel.org>
Subject: Re: [PATCH v7,3/4] drm/mediatek: keep dsi as LP00 before dcs cmds
 transfer

On Fri, 2022-05-20 at 10:00 +0800, xinlei.lee@...iatek.com wrote:
> From: Jitao Shi <jitao.shi@...iatek.com>
> 
> To comply with the panel sequence, hold the mipi signal to LP00
> before the dcs cmds transmission,
> and pull the mipi signal high from LP00 to LP11 until the start of
> the dcs cmds transmission.
> The normal panel timing is :
> (1) pp1800 DC pull up
> (2) avdd & avee AC pull high
> (3) lcm_reset pull high -> pull low -> pull high
> (4) Pull MIPI signal high (LP11) -> initial code -> send video
> data(HS mode)
> The power-off sequence is reversed.
> If dsi is not in cmd mode, then dsi will pull the mipi signal high in
> the mtk_output_dsi_enable function.
> The delay in lane_ready func is the reaction time of dsi_rx after
> pulling up the mipi signal.
> 
> Fixes: 2dd8075d2185 ("drm/mediatek: mtk_dsi: Use the drm_panel_bridge
> API")
> 
> Cc: <stable@...r.kernel.org> # 5.10.x: b255d51e3967: sched: Modify
> dsi funcs to atomic operations
> Cc: <stable@...r.kernel.org> # 5.10.x: 72c69c977502: sched: Separate
> poweron/poweroff from enable/disable and define new funcs
> Cc: <stable@...r.kernel.org> # 5.10.x
> Signed-off-by: Jitao Shi <jitao.shi@...iatek.com>
> Signed-off-by: Xinlei Lee <xinlei.lee@...iatek.com>
> Reviewed-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@...labora.com>
> ---

Reviewed-by: Rex-BC Chen <rex-bc.chen@...iatek.com>