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serial: pl011: change Rx burst size to half of trigger level

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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 <g.liakhovetski@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Guennadi Liakhovetski 2014-04-12 19:47:17 +02:00 • committed by Greg Kroah-Hartman
parent e55c2a07c4
commit b2aeb775f8
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/serial/amba-pl011.c
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@ -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,
};