drm/radeon/kms: fix for hw i2c

use the i2c pads to drive SDA

Possible fix for fdo bug 26430

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/radeon/radeon_i2c.c b/drivers/gpu/drm/radeon/radeon_i2c.c
index 4ae50c1..5d93418 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_i2c.c
+++ b/drivers/gpu/drm/radeon/radeon_i2c.c
@@ -291,6 +291,7 @@ static int r100_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
        prescale = radeon_get_i2c_prescale(rdev);
 
        reg = ((prescale << RADEON_I2C_PRESCALE_SHIFT) |
+              RADEON_I2C_DRIVE_EN |
               RADEON_I2C_START |
               RADEON_I2C_STOP |
               RADEON_I2C_GO);