linux-kernel - Re: [PATCH v2] arm64: dts: qcom: sm8250-edo: Panel framebuffer is 2.5k instead of 4k

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Date:   Wed, 7 Jun 2023 09:15:08 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        phone-devel@...r.kernel.org
Cc:     ~postmarketos/upstreaming@...ts.sr.ht,
        Martin Botka <martin.botka@...ainline.org>,
        Jami Kettunen <jami.kettunen@...ainline.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] arm64: dts: qcom: sm8250-edo: Panel framebuffer is
 2.5k instead of 4k

Il 07/06/23 00:52, Konrad Dybcio ha scritto:
> 
> 
> On 6.06.2023 23:14, Marijn Suijten wrote:
>> The framebuffer configuration for edo pdx203, written in edo dtsi (which
>> is overwritten in pdx206 dts for its smaller panel) has to use a
>> 1096x2560 configuration as this is what the panel (and framebuffer area)
>> has been initialized to.  Downstream userspace also has access to (and
>> uses) this 2.5k mode by default, and only switches the panel to 4k when
>> requested.
>>
>> This is similar to commit be8de06dc397 ("arm64: dts: qcom:
>> sm8150-kumano: Panel framebuffer is 2.5k instead of 4k") which fixed the
>> same for the previous generation Sony platform.
>>
>> Fixes: 69cdb97ef652 ("arm64: dts: qcom: sm8250: Add support for SONY Xperia 1 II / 5 II (Edo platform)")
>> Signed-off-by: Marijn Suijten <marijn.suijten@...ainline.org>
>> ---
> And so I derped again.
> 
> Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>

I would've liked more to see a commit saying "replace simple-framebuffer with xxxx"
(where xxxx is DSI panel, etc) but that will as well do for now... :-)

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

> 
> Konrad
>>
>> Changes since v2:
>> - Rename griffin (copy-paste from related patch) to pdx203 in comment.
>>
>>   arch/arm64/boot/dts/qcom/sm8250-sony-xperia-edo.dtsi | 7 ++++---
>>   1 file changed, 4 insertions(+), 3 deletions(-)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/sm8250-sony-xperia-edo.dtsi b/arch/arm64/boot/dts/qcom/sm8250-sony-xperia-edo.dtsi
>> index 3d22be747f042..8f867f841cb83 100644
>> --- a/arch/arm64/boot/dts/qcom/sm8250-sony-xperia-edo.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sm8250-sony-xperia-edo.dtsi
>> @@ -54,9 +54,10 @@ chosen {
>>   		framebuffer: framebuffer@...00000 {
>>   			compatible = "simple-framebuffer";
>>   			reg = <0 0x9c000000 0 0x2300000>;
>> -			width = <1644>;
>> -			height = <3840>;
>> -			stride = <(1644 * 4)>;
>> +			/* pdx203 BL initializes in 2.5k mode, not 4k */
>> +			width = <1096>;
>> +			height = <2560>;
>> +			stride = <(1096 * 4)>;
>>   			format = "a8r8g8b8";
>>   		};
>>   	};