Re: [PATCH] arm64: dts: rockchip: Fix wrong register range of rk3576 gpu

[Nicolas Frattaroli <nicolas.frattaroli@collabora.com>]

On Monday, 5 January 2026 09:12:00 Central European Standard Time Chaoyi Chen wrote:
> Hello Nicolas,
> 
> On 1/5/2026 3:55 PM, Nicolas Frattaroli wrote:
> > On Tuesday, 30 December 2025 10:02:46 Central European Standard Time Chaoyi Chen wrote:
> >> From: Chaoyi Chen <chaoyi.chen@rock-chips.com>
> >>
> >> According to RK3576 TRM part1 page13, the size of the GPU registers
> >> is 128 KB.
> >>
> >> Fixes: 57b1ce903966 ("arm64: dts: rockchip: Add rk3576 SoC base DT")
> >> Signed-off-by: Chaoyi Chen <chaoyi.chen@rock-chips.com>
> >> ---
> >>  arch/arm64/boot/dts/rockchip/rk3576.dtsi | 2 +-
> >>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/arch/arm64/boot/dts/rockchip/rk3576.dtsi b/arch/arm64/boot/dts/rockchip/rk3576.dtsi
> >> index 6284e7bdc442..b375015f0662 100644
> >> --- a/arch/arm64/boot/dts/rockchip/rk3576.dtsi
> >> +++ b/arch/arm64/boot/dts/rockchip/rk3576.dtsi
> >> @@ -1271,7 +1271,7 @@ power-domain@RK3576_PD_VO1 {
> >>  
> >>  		gpu: gpu@27800000 {
> >>  			compatible = "rockchip,rk3576-mali", "arm,mali-bifrost";
> >> -			reg = <0x0 0x27800000 0x0 0x200000>;
> >> +			reg = <0x0 0x27800000 0x0 0x20000>;
> >>  			assigned-clocks = <&scmi_clk SCMI_CLK_GPU>;
> >>  			assigned-clock-rates = <198000000>;
> >>  			clocks = <&cru CLK_GPU>;
> >>
> > 
> > This is only true if you only consider the GPU_CONTROL and
> > JOB_CONTROL register ranges, and leave out the MMU_STAGE1
> > and MMU_STAGE2 ranges. I don't know if those need to be
> > mapped, since the MMU control registers are < 0x2000.
> > 
> > What do other bifrost devices do?
> > 
> 
> I don't quite understand your point. And this size is 0x20000,
> not 0x2000. Before the change it was 0x200000, which overlaps the
> address space of some hardware that comes after it like JPEG. 
> 
> Could you explain it again? Thank you.

Oops, I misread. You are correct, there's one too many zeroes,
and I thought you removed one too many. :)

Reviewed-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>

> 
> > Kind regards,
> > Nicolas Frattaroli
> > 
> > 
> > 
> 
>