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authorStanislaw Gruszka <stf_xl@wp.pl>2009-01-15 16:50:44 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-15 19:39:35 -0500
commit5b96f1729064453e09805a387378e0644da1c937 (patch)
treee2ef80291f2ed0176e9d8330c0b698aae790ecd4 /drivers/spi
parent1f14081d8b31b2780e2e6e2ae2766264e1f7d38b (diff)
atmel_spi: allow transfer when max_speed_hz = 0
For some reason I have to slowdown clock to touchscreen device. In atmel_spi_setup() there is comment that max_speed_hz == 0 means as slow as possible and divider is set to maximum value. But in atmel_spi_transfer() function is check against not zero max_speed_hz with EINVAL returned. Probably driver should setup divider for each transfer based on transfer->speed_hz value, but I think that would be not necessary overhead as all used devices have constant clock. Below patch works fine for me. Signed-off-by: Stanislaw Gruszka <stf_xl@wp.pl> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/atmel_spi.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/spi/atmel_spi.c b/drivers/spi/atmel_spi.c
index 5e39bac9c51b..56ff3e6864ea 100644
--- a/drivers/spi/atmel_spi.c
+++ b/drivers/spi/atmel_spi.c
@@ -670,8 +670,7 @@ static int atmel_spi_transfer(struct spi_device *spi, struct spi_message *msg)
670 dev_dbg(controller, "new message %p submitted for %s\n", 670 dev_dbg(controller, "new message %p submitted for %s\n",
671 msg, spi->dev.bus_id); 671 msg, spi->dev.bus_id);
672 672
673 if (unlikely(list_empty(&msg->transfers) 673 if (unlikely(list_empty(&msg->transfers)))
674 || !spi->max_speed_hz))
675 return -EINVAL; 674 return -EINVAL;
676 675
677 if (as->stopping) 676 if (as->stopping)