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serial: pl011: Don't enable RX DMA if residue processing not supported 

If the DMA engine doesn't support residue processing then the RX DMA
handling won't work terribly well if polling is enabled.  So, disable
RX DMA if residue handling isn't available.

Signed-off-by: Andrew Jackson <Andrew.Jackson@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andrew Jackson 2014-11-07 14:14:47 +00:00 committed by Greg Kroah-Hartman
parent c64be9231e
commit 2d3b7d6e7d
1 changed files with 15 additions and 0 deletions
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15
drivers/tty/serial/amba-pl011.c
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@ -322,7 +322,22 @@ static void pl011_dma_probe_initcall(struct device *dev, struct uart_amba_port *
.src_maxburst = uap->fifosize >> 2, .src_maxburst = uap->fifosize >> 2,
.device_fc = false, .device_fc = false,
}; };
struct dma_slave_caps caps;
/*
* Some DMA controllers provide information on their capabilities.
* If the controller does, check for suitable residue processing
* otherwise assime all is well.
*/
if (0 == dma_get_slave_caps(chan, &caps)) {
if (caps.residue_granularity ==
DMA_RESIDUE_GRANULARITY_DESCRIPTOR) {
dma_release_channel(chan);
dev_info(uap->port.dev,
"RX DMA disabled - no residue processing\n");
return;
}
}
dmaengine_slave_config(chan, &rx_conf); dmaengine_slave_config(chan, &rx_conf);
uap->dmarx.chan = chan; uap->dmarx.chan = chan;