mmc_spi: allow setting of spi mode 3
Allow the platform data structures to specify spi mode 3
(if there is a pullup on the clock line or the spi hardware
is not able to serve spi mode 0).
Signed-off-by: Wolfgang Muees <wolfgang.mues@auerswald.de>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c
index 87e211d..ad9e0e2 100644
--- a/drivers/mmc/host/mmc_spi.c
+++ b/drivers/mmc/host/mmc_spi.c
@@ -1204,10 +1204,12 @@
/* MMC and SD specs only seem to care that sampling is on the
* rising edge ... meaning SPI modes 0 or 3. So either SPI mode
- * should be legit. We'll use mode 0 since it seems to be a
- * bit less troublesome on some hardware ... unclear why.
+ * should be legit. We'll use mode 0 since the steady state is 0,
+ * which is appropriate for hotplugging, unless the platform data
+ * specify mode 3 (if hardware is not compatible to mode 0).
*/
- spi->mode = SPI_MODE_0;
+ if (spi->mode != SPI_MODE_3)
+ spi->mode = SPI_MODE_0;
spi->bits_per_word = 8;
status = spi_setup(spi);