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drm/i915: Fall back to bit banging mode for DVO transmitter detection

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commit e4bfff54ed upstream.

As discussed in this thread
http://lists.freedesktop.org/archives/dri-devel/2013-April/037411.html
GMBUS based DVO transmitter detection seems to be unreliable which could
result in an unusable DVO port.

The attached patch fixes this by falling back to bit banging mode for
the time DVO transmitter detection is in progress.

Signed-off-by: David Müller <d.mueller@elsoft.ch>
Tested-by: David Müller <d.mueller@elsoft.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Müller 2013-04-19 10:41:50 +02:00 committed by Greg Kroah-Hartman
parent 83aa4e74a2
commit 32b9dc07fb
1 changed files with 12 additions and 1 deletions
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13
drivers/gpu/drm/i915/intel_dvo.c
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@ -370,6 +370,7 @@ void intel_dvo_init(struct drm_device *dev)
const struct intel_dvo_device *dvo = &intel_dvo_devices[i];
struct i2c_adapter *i2c;
int gpio;
bool dvoinit;
/* Allow the I2C driver info to specify the GPIO to be used in
* special cases, but otherwise default to what's defined
@ -389,7 +390,17 @@ void intel_dvo_init(struct drm_device *dev)
i2c = &dev_priv->gmbus[gpio].adapter;
intel_dvo->dev = *dvo;
if (!dvo->dev_ops->init(&intel_dvo->dev, i2c))
/* GMBUS NAK handling seems to be unstable, hence let the
* transmitter detection run in bit banging mode for now.
*/
intel_gmbus_force_bit(i2c, true);
dvoinit = dvo->dev_ops->init(&intel_dvo->dev, i2c);
intel_gmbus_force_bit(i2c, false);
if (!dvoinit)
continue;
intel_encoder->type = INTEL_OUTPUT_DVO;