As stated in STM32MP2 Reference Manual [1], chapter "HPDMA allowed AXI maximum length", "The maximum allowed AXI burst length is limited to 16.". To apply this limitation on STM32MP25, add "st,axi-max-burst-len" property in DMA controllers nodes in stm32mp251.dtsi. [1] https://www.st.com/resource/en/reference_manual/rm0457-stm32mp2325xx-advanced-armbased-3264bit-mpus-stmicroelectronics.pdf Signed-off-by: Amelie Delaunay <amelie.delaunay@xxxxxxxxxxx> --- arch/arm64/boot/dts/st/stm32mp251.dtsi | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm64/boot/dts/st/stm32mp251.dtsi b/arch/arm64/boot/dts/st/stm32mp251.dtsi index 1167cf63d7e87aaa15c5c1ed70a9f6511fd818d4..443cc8d6ae8e9e2bff1bb862b0921d9626bb78e1 100644 --- a/arch/arm64/boot/dts/st/stm32mp251.dtsi +++ b/arch/arm64/boot/dts/st/stm32mp251.dtsi @@ -181,6 +181,7 @@ hpdma: dma-controller@40400000 { <GIC_SPI 48 IRQ_TYPE_LEVEL_HIGH>; clocks = <&scmi_clk CK_SCMI_HPDMA1>; #dma-cells = <3>; + st,axi-max-burst-len = <16>; }; hpdma2: dma-controller@40410000 { @@ -204,6 +205,7 @@ hpdma2: dma-controller@40410000 { <GIC_SPI 64 IRQ_TYPE_LEVEL_HIGH>; clocks = <&scmi_clk CK_SCMI_HPDMA2>; #dma-cells = <3>; + st,axi-max-burst-len = <16>; }; hpdma3: dma-controller@40420000 { @@ -227,6 +229,7 @@ hpdma3: dma-controller@40420000 { <GIC_SPI 80 IRQ_TYPE_LEVEL_HIGH>; clocks = <&scmi_clk CK_SCMI_HPDMA3>; #dma-cells = <3>; + st,axi-max-burst-len = <16>; }; rifsc: bus@42080000 { -- 2.25.1
