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authorChris Wilson <chris@chris-wilson.co.uk>2011-04-05 16:04:40 +0100
committerKeith Packard <keithp@keithp.com>2011-04-05 09:05:56 -0700
commita6737ad15b4acf88bbf7753e929faf215adeaa3a (patch)
tree3433015f4fabcd34ca92ac81732ad26658e14a1b
parent0de009c900e7ebd21097797f723a40813e953879 (diff)
downloadlinux-linaro-a6737ad15b4acf88bbf7753e929faf215adeaa3a.tar.gz
drm/i915/lvds: Remove 0xa0 DDC probe for LVDS
This is a revert of 428d2e828c0a68206e5158a42451487601dc9194. This is broken in the same manner as for VGA: trying to write to an invalid address on the (currently 7-bit) i2c bus. One notable failure appears to be for MacBooks. The scary part was that it gave the appearance of working (i.e. reporting the absence of the panel) on various all-in-one machines with ghost LVDS panels and not failing for laptops. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Acked-by: Dave Airlie <airlied@linux.ie> Signed-off-by: Keith Packard <keithp@keithp.com>
-rw-r--r--drivers/gpu/drm/i915/intel_lvds.c24
1 files changed, 0 insertions, 24 deletions
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 86cd30bcb61..a562bd2648c 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -829,25 +829,6 @@ static bool lvds_is_present_in_vbt(struct drm_device *dev,
return false;
}
-static bool intel_lvds_ddc_probe(struct drm_device *dev, u8 pin)
-{
- struct drm_i915_private *dev_priv = dev->dev_private;
- u8 buf = 0;
- struct i2c_msg msgs[] = {
- {
- .addr = 0xA0,
- .flags = 0,
- .len = 1,
- .buf = &buf,
- },
- };
- struct i2c_adapter *i2c = &dev_priv->gmbus[pin].adapter;
- /* XXX this only appears to work when using GMBUS */
- if (intel_gmbus_is_forced_bit(i2c))
- return true;
- return i2c_transfer(i2c, msgs, 1) == 1;
-}
-
/**
* intel_lvds_init - setup LVDS connectors on this device
* @dev: drm device
@@ -888,11 +869,6 @@ bool intel_lvds_init(struct drm_device *dev)
}
}
- if (!intel_lvds_ddc_probe(dev, pin)) {
- DRM_DEBUG_KMS("LVDS did not respond to DDC probe\n");
- return false;
- }
-
intel_lvds = kzalloc(sizeof(struct intel_lvds), GFP_KERNEL);
if (!intel_lvds) {
return false;