linux-kernel - Re: [PATCH 1/3] dt-bindings: display: mediatek: Correct disp

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Date:   Thu, 7 Apr 2022 14:22:22 +0800
From:   Rex-BC Chen <rex-bc.chen@...iatek.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <chunkuang.hu@...nel.org>, <robh+dt@...nel.org>,
        <krzk+dt@...nel.org>
CC:     <matthias.bgg@...il.com>, <p.zabel@...gutronix.de>,
        <airlied@...ux.ie>, <yongqiang.niu@...iatek.com>,
        <jason-jh.lin@...iatek.com>, <nancy.lin@...iatek.com>,
        <allen-kh.cheng@...iatek.com>, <dri-devel@...ts.freedesktop.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH 1/3] dt-bindings: display: mediatek: Correct disp_aal
 binding for MT8183

On Wed, 2022-04-06 at 16:44 +0200, Krzysztof Kozlowski wrote:
> On 06/04/2022 11:46, Rex-BC Chen wrote:
> > The driver data of MT8183 and MT8173 are different.
> > The value of has_gamma for MT8173 is true while the value of MT8183
> > is
> > false. Therefore, the compatible of disp_aal for MT8183 is not
> > suitable
> > for the compatible for MT8173.
> 
> Just because one feature is not supported, it does not mean they are
> incompatible, which you claim in the patch below. Are you sure they
> are
> really incompatible and MT8173 fallback cannot be used?
> 
> 
> Best regards,
> Krzysztof

Hello Krzysztof,

Thanks for your review.

The difference of disp_aal for each MediaTek SoCs is "has_gamma".
And we only control this variable for different MediaTek SoCs.

The value of has_gamma for MT8173 is true.
The value of has_gamma for MT8183 is false. (Moreover, the driver data
is null for MT8183)

>From this situation, I think it's not compatible between MT8173 and
MT8183.

reference: 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/mediatek/mtk_disp_aal.c?h=v5.18-rc1#n153

BRs,
Rex