[PATCH v1 1/2] ARM: dts: at91: at91sam9x5ek: Use DMA for DBGU serial port

[Nicolas Ferre]

On 02/01/2024 at 17:18, ezra at easyb.ch wrote:
> From: Ezra Buehler <ezra.buehler at husqvarnagroup.com>
> 
> The UART controller does not seem to be fast enough to receive data (at
> 115200 baud) without dropping bytes when DMA is disabled.
> 
> This has often been noticed when pasting SSH keys into the serial
> console (ttyS0). Only after multiple tries, the long strings would be
> successfully transferred without missing characters.
> 
> Co-Developed-by: Michael Zimmermann <michael.zimmermann at grandcentrix.net>
> Signed-off-by: Michael Zimmermann <michael.zimmermann at grandcentrix.net>
> Signed-off-by: Ezra Buehler <ezra.buehler at husqvarnagroup.com>

Fine with me:
Acked-by: Nicolas Ferre <nicolas.ferre at microchip.com>

Thanks for your patch. Best regards,
   Nicolas

> ---
>   arch/arm/boot/dts/microchip/at91sam9x5ek.dtsi | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/microchip/at91sam9x5ek.dtsi b/arch/arm/boot/dts/microchip/at91sam9x5ek.dtsi
> index 5f4eaa618ab4..9618b8d965b0 100644
> --- a/arch/arm/boot/dts/microchip/at91sam9x5ek.dtsi
> +++ b/arch/arm/boot/dts/microchip/at91sam9x5ek.dtsi
> @@ -39,6 +39,8 @@ &adc0 {
>   };
> 
>   &dbgu {
> +       atmel,use-dma-rx;
> +       atmel,use-dma-tx;
>          status = "okay";
>   };
> 
> --
> 2.39.2
>