ipq40xx: disable SPI DMA for Fritzbox 4040

We have seen hung devices and failures during SPI transactions on
Fritzbox devices with a gluon based freifunk network. We have narrowed
down that disabling DMA for spi fixes the problem, so disable dma for
the SPI controller on the Fritzbox 4040.

Signed-off-by: Rouven Czerwinski <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/15966
Signed-off-by: John Crispin <[email protected]>

diff --git a/target/linux/ipq40xx/files-6.6/arch/arm/boot/dts/qcom/qcom-ipq4018-fritzbox-4040.dts b/target/linux/ipq40xx/files-6.6/arch/arm/boot/dts/qcom/qcom-ipq4018-fritzbox-4040.dts
index b3617eb45eeed042ac2c8c564904f4ee766d66de..bcb3b24232c9665631c389b6f7b9f6bd005397b4 100644 (file)
--- a/target/linux/ipq40xx/files-6.6/arch/arm/boot/dts/qcom/qcom-ipq4018-fritzbox-4040.dts
+++ b/target/linux/ipq40xx/files-6.6/arch/arm/boot/dts/qcom/qcom-ipq4018-fritzbox-4040.dts
@@ -151,6 +151,8 @@
        pinctrl-0 = <&spi_0_pins>;
        pinctrl-names = "default";
        status = "okay";
+       /delete-property/ dmas;
+       /delete-property/ dma-names;
        cs-gpios = <&tlmm 54 GPIO_ACTIVE_HIGH>;
 
        flash@0 {