linux-kernel - Re: [PATCH] drm/mediatek: mtk_dpi: Reorder output formats on MT8195/88

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Message-ID: <c197ad80-cd12-4168-b1db-9826cc42760f@collabora.com>
Date: Wed, 11 Jun 2025 11:07:08 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Louis-Alexis Eyraud <louisalexis.eyraud@...labora.com>,
 Chun-Kuang Hu <chunkuang.hu@...nel.org>,
 Philipp Zabel <p.zabel@...gutronix.de>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>, Matthias Brugger <matthias.bgg@...il.com>
Cc: kernel@...labora.com, dri-devel@...ts.freedesktop.org,
 linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] drm/mediatek: mtk_dpi: Reorder output formats on
 MT8195/88

Il 06/06/25 14:50, Louis-Alexis Eyraud ha scritto:
> Reorder output format arrays in both MT8195 DPI and DP_INTF block
> configuration by decreasing preference order instead of alphanumeric
> one, as expected by the atomic_get_output_bus_fmts callback function
> of drm_bridge controls, so the RGB ones are used first during the
> bus format negotiation process.
> 
> Fixes: 20fa6a8fc588 ("drm/mediatek: mtk_dpi: Allow additional output formats on MT8195/88")
> Signed-off-by: Louis-Alexis Eyraud <louisalexis.eyraud@...labora.com>

Well actually there is a way to make this still behave while having those
alphabetically sorted, which I was thinking that was already properly implemented
for MediaTek drivers.

Apparently it's not true for *all* of them... but then, just keeping things ordered
by preference is a simpler solution and probably the best one for now.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>