drm/i915: disable gmbus on i830
The hw just returns garbage.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=49838
Reported-and-tested-by: Vladyslav <DFEW.Entwickler@googlemail.com>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c
index e04255e..4a9707d 100644
--- a/drivers/gpu/drm/i915/intel_i2c.c
+++ b/drivers/gpu/drm/i915/intel_i2c.c
@@ -490,6 +490,10 @@
/* By default use a conservative clock rate */
bus->reg0 = port | GMBUS_RATE_100KHZ;
+ /* gmbus seems to be broken on i830 */
+ if (IS_I830(dev))
+ bus->force_bit = true;
+
intel_gpio_setup(bus, port);
}