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Message-ID: <21efdb3e-3c4d-0bc9-bbde-34ec3e04bfad@collabora.com>
Date:   Tue, 10 Jan 2023 10:22:44 +0100
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Subject: Re: [PATCH v2 3/3] drm/panel: boe-tv101wum-nl6: Fine tune the panel
 power sequence
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To:     xinlei.lee@mediatek.com, chunkuang.hu@kernel.org,
        p.zabel@pengutronix.de, airlied@linux.ie, daniel@ffwll.ch,
        matthias.bgg@gmail.com, jitao.shi@mediatek.com,
        thierry.reding@gmail.com, sam@ravnborg.org
Cc:     dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org,
        Project_Global_Chrome_Upstream_Group@mediatek.com
References: <1673330093-6771-1-git-send-email-xinlei.lee@mediatek.com>
 <1673330093-6771-4-git-send-email-xinlei.lee@mediatek.com>
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>
In-Reply-To: <1673330093-6771-4-git-send-email-xinlei.lee@mediatek.com>
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Il 10/01/23 06:54, xinlei.lee@mediatek.com ha scritto:
> From: Xinlei Lee <xinlei.lee@mediatek.com>
> 
> For "boe,tv105wum-nw0" this special panel, it is stipulated in the
> panel spec that MIPI needs to keep the LP11 state before the
> lcm_reset pin is pulled high.
> 
> Signed-off-by: Xinlei Lee <xinlei.lee@mediatek.com>
> ---
>   drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c | 6 ++++++
>   1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c b/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
> index f0093035f1ff..67df61de64ae 100644
> --- a/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
> +++ b/drivers/gpu/drm/panel/panel-boe-tv101wum-nl6.c
> @@ -36,6 +36,7 @@ struct panel_desc {
>   	const struct panel_init_cmd *init_cmds;
>   	unsigned int lanes;
>   	bool discharge_on_disable;
> +	bool lp11_before_reset;
>   };
>   
>   struct boe_panel {
> @@ -1261,6 +1262,10 @@ static int boe_panel_prepare(struct drm_panel *panel)
>   
>   	usleep_range(10000, 11000);
>   
> +	if (boe->desc->lp11_before_reset) {
> +		mipi_dsi_dcs_nop(boe->dsi);

NOP will never reach the driveric if it is in reset, which should apparently be
the state of it at that point in code.

I guess that you wanted to do that after LCM reset and before sending init cmds.

Regards,
Angelo