From: Guennadi Liakhovetski Date: Sat, 12 Apr 2014 17:47:17 +0000 (+0200) Subject: serial: pl011: change Rx burst size to half of trigger level X-Git-Tag: v3.15-rc2~14^2~10 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=b2aeb775f814c9543784b15a5f2d87ea91005f3f;p=linux-block.git 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: Guennadi Liakhovetski Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c index d4eda24aa68b..ca0ec600fab6 100644 --- a/drivers/tty/serial/amba-pl011.c +++ b/drivers/tty/serial/amba-pl011.c @@ -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, };