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

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Date:   Wed, 14 Jun 2023 14:43:09 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Marijn Suijten <marijn.suijten@...ainline.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        phone-devel@...r.kernel.org, ~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

On 14.06.2023 14:40, Marijn Suijten wrote:
> On 2023-06-07 09:15:08, AngeloGioacchino Del Regno wrote:
>> 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... :-)
> 
> Fwiw we could keep it around as MDSS "gracefully" takes over when it
> probes a little bit later with fbcon over DRM/KMS, and it sometimes
> helps reading what is up when something fails before or during MDSS
> probe.
I believe we should do this. Perhaps even add some early code to drm/msm
that'd read out the address (and other configuration) from the mdp hw and
set it up automagically.

Konrad
> 
> - Marijn
> 
>> 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";
>>>>   		};
>>>>   	};
>>