spi: spi-fsl-dspi: Fix cs_change handling in message transfer

avostrik · broonie · commit 92dc20d83ade · 2016-04-05T12:12:42.000-07:00
There are use cases when chip select should be triggered between transfers
in single SPI message. Current implementation does this only on last
transfer in message ignoring cs_change value provided in current transfer.

Signed-off-by: Andrey Vostrikov &lt;andrey.vostrikov@cogentembedded.com&gt;
Signed-off-by: Mark Brown &lt;broonie@kernel.org&gt;
diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c
@@ -385,8 +385,8 @@ static int dspi_transfer_one_message(struct spi_master *master,
 		dspi->cur_chip = spi_get_ctldata(spi);
 		dspi->cs = spi->chip_select;
 		dspi->cs_change = 0;
-		if (dspi->cur_transfer->transfer_list.next
-				== &dspi->cur_msg->transfers)
+		if (list_is_last(&dspi->cur_transfer->transfer_list,
+				 &dspi->cur_msg->transfers) || transfer->cs_change)
 			dspi->cs_change = 1;
 		dspi->void_write_data = dspi->cur_chip->void_write_data;
 
