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Commit b2aeb775 authored by Guennadi Liakhovetski's avatar Guennadi Liakhovetski Committed by Greg Kroah-Hartman
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serial: pl011: change Rx burst size to half of trigger level 



The amba-pl011.c driver sets DMA burst size equal to FIFO trigger level.
If now exactly DMA burst size bytes are received, the DMAC will retrieve
them all and no Rx timeout interrupt will be generated. To fix that set
the burst size to half the FIFO trigger level.

Signed-off-by: default avatarGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e55c2a07

drivers/tty/serial/amba-pl011.c

+1 −1
Original line number Diff line number Diff line
@@ -318,7 +318,7 @@ static void pl011_dma_probe_initcall(struct device *dev, struct uart_amba_port * 
			.src_addr = uap->port.mapbase + UART01x_DR,

			.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE,

			.direction = DMA_DEV_TO_MEM,

			.src_maxburst = uap->fifosize >> 1,

			.src_maxburst = uap->fifosize >> 2,

			.device_fc = false,

		};