* [PATCH] ARM: dts: exynos4210-universal_c210: disable DMA for UARTs
@ 2015-11-16 14:36 Marek Szyprowski
2015-11-19 12:37 ` Krzysztof Kozlowski
0 siblings, 1 reply; 2+ messages in thread
From: Marek Szyprowski @ 2015-11-16 14:36 UTC (permalink / raw)
To: linux-samsung-soc
Cc: Marek Szyprowski, Kukjin Kim, Krzysztof Kozlowski,
Bartlomiej Zolnierkiewicz
PDMA for UART devices seems not to be working properly on Exynos 4210
revision 0 used in Universal C210 boards, so disable it to let one to
use UART devices (driver defaults to PIO mode if DMA is not present).
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
arch/arm/boot/dts/exynos4210-universal_c210.dts | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/arch/arm/boot/dts/exynos4210-universal_c210.dts b/arch/arm/boot/dts/exynos4210-universal_c210.dts
index 81b7ec7..4f5d379 100644
--- a/arch/arm/boot/dts/exynos4210-universal_c210.dts
+++ b/arch/arm/boot/dts/exynos4210-universal_c210.dts
@@ -560,16 +560,24 @@
&serial_0 {
status = "okay";
+ /delete-property/dmas;
+ /delete-property/dma-names;
};
&serial_1 {
status = "okay";
+ /delete-property/dmas;
+ /delete-property/dma-names;
};
&serial_2 {
status = "okay";
+ /delete-property/dmas;
+ /delete-property/dma-names;
};
&serial_3 {
status = "okay";
+ /delete-property/dmas;
+ /delete-property/dma-names;
};
--
1.9.2
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH] ARM: dts: exynos4210-universal_c210: disable DMA for UARTs
2015-11-16 14:36 [PATCH] ARM: dts: exynos4210-universal_c210: disable DMA for UARTs Marek Szyprowski
@ 2015-11-19 12:37 ` Krzysztof Kozlowski
0 siblings, 0 replies; 2+ messages in thread
From: Krzysztof Kozlowski @ 2015-11-19 12:37 UTC (permalink / raw)
To: Marek Szyprowski, linux-samsung-soc
Cc: k.kozlowski.k, Kukjin Kim, Bartlomiej Zolnierkiewicz
W dniu 16.11.2015 o 23:36, Marek Szyprowski pisze:
> PDMA for UART devices seems not to be working properly on Exynos 4210
> revision 0 used in Universal C210 boards, so disable it to let one to
> use UART devices (driver defaults to PIO mode if DMA is not present).
>
> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> ---
> arch/arm/boot/dts/exynos4210-universal_c210.dts | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
Oh, DMA on UART strikes back.
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Best regards,
Krzysztof
^ permalink raw reply [flat|nested] 2+ messages in thread
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2015-11-16 14:36 [PATCH] ARM: dts: exynos4210-universal_c210: disable DMA for UARTs Marek Szyprowski
2015-11-19 12:37 ` Krzysztof Kozlowski
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