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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>
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@ -408,12 +408,9 @@ static irqreturn_t dw_spi_irq(int irq, void *dev_id)
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/* Must be called inside pump_transfers() */
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static void poll_transfer(struct dw_spi *dws)
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{
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if (dws->tx) {
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while (dws->write(dws))
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dws->read(dws);
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}
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while (dws->write(dws))
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dws->read(dws);
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dws->read(dws);
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transfer_complete(dws);
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}
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