linux-kernel - Re: [PATCH v4 0/5] Support alpha blending in MTK display driver

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Message-ID: <6c9b7f85-f92d-44ed-ae9d-00f6d55ea614@gmail.com>
Date: Thu, 12 Sep 2024 23:29:00 +0300
From: Alper Nebi Yasak <alpernebiyasak@...il.com>
To: linux-mediatek@...ts.infradead.org,
 Chun-Kuang Hu <chunkuang.hu@...nel.org>,
 Hsiao Chien Sung <shawn.sung@...iatek.com>
Cc: Philipp Zabel <p.zabel@...gutronix.de>, David Airlie <airlied@...il.com>,
 Daniel Vetter <daniel@...ll.ch>, Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org,
 Hsiao Chien Sung <shawn.sung@...iatek.corp-partner.google.com>,
 CK Hu <ck.hu@...iatek.com>, Chen-Yu Tsai <wenst@...omium.org>
Subject: Re: [PATCH v4 0/5] Support alpha blending in MTK display driver

Hi,

On 2024-07-31 16:34 +03:00, Chun-Kuang Hu wrote:
> Hi, Shawn:
> 
> Hsiao Chien Sung via B4 Relay
> <devnull+shawn.sung.mediatek.com@...nel.org> 於 2024年7月17日 週三 下午1:24寫道：
>>
>> Support "Pre-multiplied" and "None" blend mode on MediaTek's chips by
>> adding correct blend mode property when the planes init.
>> Before this patch, only the "Coverage" mode (default) is supported.
> 
> For the whole series, applied to mediatek-drm-next [1], thanks.
> 
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git/log/?h=mediatek-drm-next

I am seeing broken colors on an MT8173 Chromebook with next-20240912,
which goes away if I git-revert this series (commits 1f66fe62cc09
eb17c5909481 a3f7f7ef4bfe 59e9d9de25f0 4225d5d5e779).

To illustrate, I took a picture [1] of some color mixing diagrams from
Wikipedia [2]. Do you have an idea of what goes wrong?

(I'm busy with too many things so I don't want to debug it now...)

[1] https://i.imgur.com/tNFvovB.jpeg
[2] https://en.wikipedia.org/wiki/Color_space#Generic