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spi/dw_spi: remove conditional from 'poll_transfer'. 

The 'poll_transfer' function employs a conditional to test whether the
transmit buffer is valid; in doing so, on a receive operation no data is
clocked out, thus no data is clocked in and ultimately errors appear.

This removes the conditional as the transmit function will be set to a null
writer when the transmit buffer is invalid, allowing the driver to clock
0x00 out to the device to receive data from the device.

Signed-off-by: George Shore <george@georgeshore.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
George Shore 2010-01-21 11:40:51 +00:00 committed by Grant Likely
parent 426c0093d8
commit f4aec798ae
1 changed files with 2 additions and 5 deletions
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7
drivers/spi/dw_spi.c
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@ -408,12 +408,9 @@ static irqreturn_t dw_spi_irq(int irq, void *dev_id)
/* Must be called inside pump_transfers() */
static void poll_transfer(struct dw_spi *dws)
{
if (dws->tx) {
while (dws->write(dws))
dws->read(dws);
}
while (dws->write(dws))
dws->read(dws);
dws->read(dws);
transfer_complete(dws);
}