On 13/07/2023 17:52, Amit Pundir wrote:
> Adding a reserved memory region for the framebuffer memory
> (the splash memory region set up by the bootloader).
>
> Signed-off-by: Amit Pundir <amit.pun...@linaro.org>
Reviewed-by: Caleb Connolly <caleb.conno...@linaro.org>
> ---
> v5: Re-sending with updated dt-bindings patch in mdss-common
> schema.
>
> v4: Re-sending this along with a new dt-bindings patch to
> document memory-region property in qcom,sdm845-mdss
> schema and keep dtbs_check happy.
>
> v3: Point this reserved region to MDSS.
>
> v2: Updated commit message.
>
> There was some dicussion on v1 but it didn't go anywhere,
> https://lore.kernel.org/linux-kernel/20230124182857.1524912-1-amit.pun...@linaro.org/T/#u.
> The general consensus is that this memory should be freed and be
> made resuable but that (releasing this piece of memory) has been
> tried before and it is not trivial to return the reserved memory
> node to the system RAM pool in this case.
>
> arch/arm64/boot/dts/qcom/sdm845-db845c.dts | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
> b/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
> index d6b464cb61d6..f546f6f57c1e 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
> +++ b/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
> @@ -101,6 +101,14 @@ hdmi_con: endpoint {
> };
> };
>
> + reserved-memory {
> + /* Cont splash region set up by the bootloader */
> + cont_splash_mem: framebuffer@9d400000 {
> + reg = <0x0 0x9d400000 0x0 0x2400000>;
> + no-map;
> + };
> + };
> +
> lt9611_1v8: lt9611-vdd18-regulator {
> compatible = "regulator-fixed";
> regulator-name = "LT9611_1V8";
> @@ -506,6 +514,7 @@ &i2c14 {
> };
>
> &mdss {
> + memory-region = <&cont_splash_mem>;
> status = "okay";
> };
>
--
// Caleb (they/them)
