A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-31 12:10:52 -04:00
Code Issues Projects Releases Packages Wiki Activity

atmel_spi: allow transfer when max_speed_hz = 0

Browse source 
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 <[email protected]>
Signed-off-by: Haavard Skinnemoen <[email protected]>
Cc: David Brownell <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Stanislaw Gruszka 2009-01-15 13:50:44 -08:00 • committed by Linus Torvalds
commit 5b96f17290
1 changed files with 1 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

3
drivers/spi/atmel_spi.c
View file

@ -670,8 +670,7 @@ static int atmel_spi_transfer(struct spi_device *spi, struct spi_message *msg)
dev_dbg(controller, "new message %p submitted for %s\n",
msg, spi->dev.bus_id);
if (unlikely(list_empty(&msg->transfers)
|| !spi->max_speed_hz))
if (unlikely(list_empty(&msg->transfers)))
return -EINVAL;
if (as->stopping)