From cb8ea7527b813dd6e19fb07328f7867a5f0a8d0a Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Tue, 28 Sep 2010 13:35:47 +0100 Subject: [PATCH] drm/i915: Use i2c bit banging instead of GMBUS There are several reported instances of GMBUS failing to successfully read the EDID, so revert back to bit banging until the issue is resolved. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=30371 Signed-off-by: Chris Wilson --- drivers/gpu/drm/i915/intel_i2c.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c index 9192024..2449a74 100644 --- a/drivers/gpu/drm/i915/intel_i2c.c +++ b/drivers/gpu/drm/i915/intel_i2c.c @@ -379,6 +379,9 @@ int intel_setup_gmbus(struct drm_device *dev) /* By default use a conservative clock rate */ bus->reg0 = i | GMBUS_RATE_100KHZ; + + /* XXX force bit banging until GMBUS is fully debugged */ + bus->force_bit = intel_gpio_create(dev_priv, i); } intel_i2c_reset(dev_priv->dev); -- 2.7.4