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

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Date:   Thu, 7 Apr 2022 08:49:00 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Rex-BC Chen <rex-bc.chen@...iatek.com>, 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 07/04/2022 08:22, Rex-BC Chen wrote:
> 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.

You repeated the commit msg without bringing any new information... but
let it be, I assume setting gamma on MTT8183 is incorrect or produces
wrong results.


Best regards,
Krzysztof