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Subject[ 04/68] drm/radeon: only add the mm i2c bus if the hw_i2c module param is set
3.2-stable review patch.  If anyone has any objections, please let me know.

------------------
From: Alex Deucher <alexander.deucher@amd.com>

commit 46783150a6552f9513f08e62cfcc07125d6e502b upstream.

It seems it can corrupt the monitor EDID in certain cases on certain
boards when running sensors detect. It's rarely used anyway outside
of AIW boards.

http://lists.lm-sensors.org/pipermail/lm-sensors/2012-April/035847.html
http://lists.freedesktop.org/archives/xorg/2011-January/052239.html

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/gpu/drm/radeon/radeon_i2c.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/gpu/drm/radeon/radeon_i2c.c
+++ b/drivers/gpu/drm/radeon/radeon_i2c.c
@@ -890,6 +890,10 @@ struct radeon_i2c_chan *radeon_i2c_creat
struct radeon_i2c_chan *i2c;
int ret;

+ /* don't add the mm_i2c bus unless hw_i2c is enabled */
+ if (rec->mm_i2c && (radeon_hw_i2c == 0))
+ return NULL;
+
i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);
if (i2c == NULL)
return NULL;



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