[PATCH] arm64: dts: hisilicon: hi3798cv200: Add missing dma-ranges

[PATCH] arm64: dts: hisilicon: hi3798cv200: Add missing dma-ranges

[Shawn Guo]

Reboot starts failing on Poplar since commit 8424ecdde7df ("arm64: mm:
Set ZONE_DMA size based on devicetree's dma-ranges"), which effectively
changes zone_dma_bits from 30 to 32 for arm64 platforms that do not
properly define dma-ranges in device tree.  It's unclear how Poplar reboot
gets broken by this change exactly, but a dma-ranges limiting zone_dma to
the first 1 GB fixes the regression.

Fixes: 2f20182ed670 ("arm64: dts: hisilicon: add dts files for hi3798cv200-poplar board")
Cc: stable@vger.kernel.org
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
---
 arch/arm64/boot/dts/hisilicon/hi3798cv200.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/hisilicon/hi3798cv200.dtsi b/arch/arm64/boot/dts/hisilicon/hi3798cv200.dtsi
index f6bc001c3832..2f4ad5da5e33 100644
--- a/arch/arm64/boot/dts/hisilicon/hi3798cv200.dtsi
+++ b/arch/arm64/boot/dts/hisilicon/hi3798cv200.dtsi
@@ -122,6 +122,7 @@ soc: soc@f0000000 {
 		#address-cells = <1>;
 		#size-cells = <1>;
 		ranges = <0x0 0x0 0xf0000000 0x10000000>;
+		dma-ranges = <0x0 0x0 0x0 0x40000000>;
 
 		crg: clock-reset-controller@8a22000 {
 			compatible = "hisilicon,hi3798cv200-crg", "syscon", "simple-mfd";
-- 
2.47.3

Re: [PATCH] arm64: dts: hisilicon: hi3798cv200: Add missing dma-ranges

[Wei Xu]

Hi Shawn,

On 2026/2/27 15:22, Shawn Guo wrote:
> Reboot starts failing on Poplar since commit 8424ecdde7df ("arm64: mm:
> Set ZONE_DMA size based on devicetree's dma-ranges"), which effectively
> changes zone_dma_bits from 30 to 32 for arm64 platforms that do not
> properly define dma-ranges in device tree.  It's unclear how Poplar reboot
> gets broken by this change exactly, but a dma-ranges limiting zone_dma to
> the first 1 GB fixes the regression.
> 
> Fixes: 2f20182ed670 ("arm64: dts: hisilicon: add dts files for hi3798cv200-poplar board")
> Cc: stable@vger.kernel.org
> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
> ---
>  arch/arm64/boot/dts/hisilicon/hi3798cv200.dtsi | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/boot/dts/hisilicon/hi3798cv200.dtsi b/arch/arm64/boot/dts/hisilicon/hi3798cv200.dtsi
> index f6bc001c3832..2f4ad5da5e33 100644
> --- a/arch/arm64/boot/dts/hisilicon/hi3798cv200.dtsi
> +++ b/arch/arm64/boot/dts/hisilicon/hi3798cv200.dtsi
> @@ -122,6 +122,7 @@ soc: soc@f0000000 {
>  		#address-cells = <1>;
>  		#size-cells = <1>;
>  		ranges = <0x0 0x0 0xf0000000 0x10000000>;
> +		dma-ranges = <0x0 0x0 0x0 0x40000000>;
>  
>  		crg: clock-reset-controller@8a22000 {
>  			compatible = "hisilicon,hi3798cv200-crg", "syscon", "simple-mfd";
> 

Applied to the HiSilicon arm64 dt tree.
Thanks!

Best Regards,
Wei