| Message ID | 20240102161839.702625-1-ezra.buehler@husqvarna.com |
|---|---|
| Headers | show |
| Series | ARM: dts: at91: gardena-smart-gateway: Use DMA for serial ports | expand |
On 02/01/2024 at 17:18, ezra@easyb.ch wrote: > From: Ezra Buehler <ezra.buehler@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@grandcentrix.net> > Signed-off-by: Michael Zimmermann <michael.zimmermann@grandcentrix.net> > Signed-off-by: Ezra Buehler <ezra.buehler@husqvarnagroup.com> Fine with me: Acked-by: Nicolas Ferre <nicolas.ferre@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 >
From: Ezra Buehler <ezra.buehler@husqvarnagroup.com> On our AT91SAM9G25-based GARDENA smart Gateway we have been experiencing various problems which we were able to trace back to unreliable UART communication. Enabling DMA for the serial ports resolved these issues. Ezra Buehler (2): ARM: dts: at91: at91sam9x5ek: Use DMA for DBGU serial port ARM: dts: at91: gardena-smart-gateway: Use DMA for USART3 .../boot/dts/microchip/at91sam9g25-gardena-smart-gateway.dts | 2 ++ arch/arm/boot/dts/microchip/at91sam9x5ek.dtsi | 2 ++ 2 files changed, 4 insertions(+) -- 2.39.2