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drm/radeon: only add the mm i2c bus if the hw_i2c module param is set

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commit 46783150a6 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>
This commit is contained in:
Alex Deucher
2012-04-10 12:14:27 -04:00
committed by Greg Kroah-Hartman
parent f4aca1c9b1
commit d9a8fbbbcc
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/radeon/radeon_i2c.c
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@@ -890,6 +890,10 @@ struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,
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;