6.12-stable review patch. If anyone has any objections, please let me know.
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From: Ze Huang huangze@whut.edu.cn
[ Upstream commit 3e6244429ba38f8dee3336b8b805948276b281ab ]
The "snps,data-width" property[1] defines the AXI data width of the DMA controller as:
width = 8 × (2^n) bits
(0 = 8 bits, 1 = 16 bits, 2 = 32 bits, ..., 6 = 512 bits) where "n" is the value of "snps,data-width".
For the CV18xx DMA controller, the correct AXI data width is 32 bits, corresponding to "snps,data-width = 2".
Test results on Milkv Duo S can be found here [2].
Link: https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bindi... [1] Link: https://gist.github.com/Sutter099/4fa99bb2d89e5af975983124704b3861 [2]
Fixes: 514951a81a5e ("riscv: dts: sophgo: cv18xx: add DMA controller") Co-developed-by: Yu Yuan yu.yuan@sjtu.edu.cn Signed-off-by: Yu Yuan yu.yuan@sjtu.edu.cn Signed-off-by: Ze Huang huangze@whut.edu.cn Link: https://lore.kernel.org/r/20250428-duo-dma-config-v1-1-eb6ad836ca42@whut.edu... Signed-off-by: Inochi Amaoto inochiama@gmail.com Signed-off-by: Chen Wang unicorn_wang@outlook.com Signed-off-by: Chen Wang wangchen20@iscas.ac.cn Signed-off-by: Sasha Levin sashal@kernel.org --- arch/riscv/boot/dts/sophgo/cv18xx.dtsi | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/riscv/boot/dts/sophgo/cv18xx.dtsi b/arch/riscv/boot/dts/sophgo/cv18xx.dtsi index b724fb6d9689e..b8063ba6d6d7f 100644 --- a/arch/riscv/boot/dts/sophgo/cv18xx.dtsi +++ b/arch/riscv/boot/dts/sophgo/cv18xx.dtsi @@ -309,7 +309,7 @@ 1024 1024 1024 1024>; snps,priority = <0 1 2 3 4 5 6 7>; snps,dma-masters = <2>; - snps,data-width = <4>; + snps,data-width = <2>; status = "disabled"; };