linux-kernel - Re: [PATCH] arm64: dts: qcom: sdm845-db845c: Mark cont splash memory region as reserved

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Date:   Tue, 31 Jan 2023 10:46:39 +0000
From:   Caleb Connolly <caleb.connolly@...aro.org>
To:     Amit Pundir <amit.pundir@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        dt <devicetree@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: qcom: sdm845-db845c: Mark cont splash memory
 region as reserved



On 1/24/23 18:28, Amit Pundir wrote:
> Put cont splash memory region under the reserved-memory
> as confirmed by the downstream code as well.

Can we put the framebuffer region in sdm845.dtsi? afaik the only device 
with a non-standard address for this is Cheza, and the SDM850 devices. 
All other devices (even the sdm845 Sony ones) have it at the same 
address and size. The other reserved-memory regions are basically just 
whatever MTP/QRD uses anyway.

shift-axolotl currently reserves the wrong size (it only reserves the 
size needed for it's resolution), the OnePlus 6 is also missing the region.
> 
> Signed-off-by: Amit Pundir <amit.pundir@...aro.org>
> ---
>   arch/arm64/boot/dts/qcom/sdm845-db845c.dts | 8 ++++++++
>   1 file changed, 8 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sdm845-db845c.dts b/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
> index f41c6d600ea8..2ae59432cbda 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
> +++ b/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
> @@ -100,6 +100,14 @@ hdmi_con: endpoint {
>   		};
>   	};
>   
> +	reserved-memory {
> +		/* Cont splash region set up by the bootloader */
> +		cont_splash_mem: framebuffer@...00000 {
> +			reg = <0x0 0x9d400000 0x0 0x2400000>;
> +			no-map;
> +		};
> +	};
> +
>   	lt9611_1v8: lt9611-vdd18-regulator {
>   		compatible = "regulator-fixed";
>   		regulator-name = "LT9611_1V8";

-- 
--
Kind Regards,
Caleb (they/them)