drm/i915: Fix DDC on some systems by clearing BIOS GMBUS setup.
This is a sync of a fix I made in the old UMS code. If the BIOS uses
the GMBUS and doesn't clear that setup, then our bit-banging I2C can
fail, leading to monitors not being detected.
Signed-off-by: Eric Anholt <eric@anholt.net>
diff --git a/drivers/gpu/drm/i915/i915_suspend.c b/drivers/gpu/drm/i915/i915_suspend.c
index cd10d9b8..c5a6df9 100644
--- a/drivers/gpu/drm/i915/i915_suspend.c
+++ b/drivers/gpu/drm/i915/i915_suspend.c
@@ -27,7 +27,7 @@
#include "drmP.h"
#include "drm.h"
#include "i915_drm.h"
-#include "i915_drv.h"
+#include "intel_drv.h"
static bool i915_pipe_enabled(struct drm_device *dev, enum pipe pipe)
{
@@ -816,6 +816,9 @@
for (i = 0; i < 3; i++)
I915_WRITE(SWF30 + (i << 2), dev_priv->saveSWF2[i]);
+ /* I2C state */
+ intel_i2c_reset_gmbus(dev);
+
return 0;
}