On 2024-06-28 14:00, Diederik de Haas wrote:
There have been several attempts to set the dma-names property on the
SoC level (in rk356x.dtsi), but that appears to cause problems when set
on channels without flow control.
Quoting part of a previous attempt for clarification:
Nah, enabling it for bluetooth is fine because you have flow control.
My issues have been on channels without flow control. Without DMA it
simply drops messages or the channel hangs until you close and reopen
it. With DMA, when an overflow locks up the channel it is usually
unavailable until the board is rebooted.
Setting it on the board level for the bluetooth connection was deemed
safe, so do so for the Quartz64 Model B.
This fixes the following error/warning:
of_dma_request_slave_channel: dma-names property of node
'/serial@fe650000' missing or empty
dw-apb-uart fe650000.serial: failed to request DMA
Signed-off-by: Diederik de Haas <didi.debian@xxxxxxxxx>
Link: https://libera.irclog.whitequark.org/armlinux/2024-02-29
Link: https://lore.kernel.org/linux-rockchip/18284546.sWSEgdgrri@diego/
Thanks for this patch, it's looking good to me.
Reviewed-by: Dragan Simic <dsimic@xxxxxxxxxxx>
---
arch/arm64/boot/dts/rockchip/rk3566-quartz64-b.dts | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm64/boot/dts/rockchip/rk3566-quartz64-b.dts
b/arch/arm64/boot/dts/rockchip/rk3566-quartz64-b.dts
index b908ce006c26..13e599a85eb8 100644
--- a/arch/arm64/boot/dts/rockchip/rk3566-quartz64-b.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3566-quartz64-b.dts
@@ -652,6 +652,7 @@ &tsadc {
};
&uart1 {
+ dma-names = "tx", "rx";
pinctrl-names = "default";
pinctrl-0 = <&uart1m0_xfer &uart1m0_ctsn &uart1m0_rtsn>;
status = "okay";
