linux-kernel - Re: [PATCH v4 9/9] drm/mediatek: dsi: Use mipi_dsi_pixel_format_to

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Date: Tue, 6 Feb 2024 16:24:11 +0100
From: Alexandre Mergnat <amergnat@...libre.com>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 chunkuang.hu@...nel.org
Cc: fshao@...omium.org, p.zabel@...gutronix.de, airlied@...il.com,
 daniel@...ll.ch, matthias.bgg@...il.com, dri-devel@...ts.freedesktop.org,
 linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, kernel@...labora.com
Subject: Re: [PATCH v4 9/9] drm/mediatek: dsi: Use
 mipi_dsi_pixel_format_to_bpp() helper function

Reviewed-by: Alexandre Mergnat <amergnat@...libre.com>

On 06/02/2024 13:07, AngeloGioacchino Del Regno wrote:
> Instead of open coding, use the mipi_dsi_pixel_format_to_bpp() helper
> function from drm_mipi_dsi.h in mtk_dsi_poweron() and for validation
> in mtk_dsi_bridge_mode_valid().
> 
> Note that this function changes the behavior of this driver: previously,
> in case of unknown formats, it would (wrongly) assume that it should
> account for a 24-bits format - now it will return an error and refuse
> to set clocks and/or enable the DSI.
> 
> This is done because setting the wrong data rate will only produce a
> garbage output that the display will misinterpret both because this
> driver doesn't actually provide any extra-spec format support and/or
> because the data rate (hence, the HS clock) will be wrong.

-- 
Regards,
Alexandre