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drm/i915: crt fetch EDID by DVI-I converter on G4x platform

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Usually crt mainly get modes via GPIOA ports.
However on G4X platform we need to probe possible
ports for DVI-I, which could be wired to GPIOD,
then fetch our desired EDID, i.e on DG45ID platform
we successfully fetch EDID by GPIOD port.

It fixed freedesktop.org bug #21084

Signed-off-by: Ma Ling <ling.ma@intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
ling.ma@intel.com 2009-06-30 11:35:34 +08:00 committed by Eric Anholt
parent 22bd50c5b9
commit 8e4d36b993
1 changed files with 27 additions and 1 deletions
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28
drivers/gpu/drm/i915/intel_crt.c
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@ -428,8 +428,34 @@ static void intel_crt_destroy(struct drm_connector *connector)
static int intel_crt_get_modes(struct drm_connector *connector)
{
int ret;
struct intel_output *intel_output = to_intel_output(connector);
return intel_ddc_get_modes(intel_output);
struct intel_i2c_chan *ddcbus;
struct drm_device *dev = connector->dev;
ret = intel_ddc_get_modes(intel_output);
if (ret || !IS_G4X(dev))
goto end;
ddcbus = intel_output->ddc_bus;
/* Try to probe digital port for output in DVI-I -> VGA mode. */
intel_output->ddc_bus =
intel_i2c_create(connector->dev, GPIOD, "CRTDDC_D");
if (!intel_output->ddc_bus) {
intel_output->ddc_bus = ddcbus;
dev_printk(KERN_ERR, &connector->dev->pdev->dev,
"DDC bus registration failed for CRTDDC_D.\n");
goto end;
}
/* Try to get modes by GPIOD port */
ret = intel_ddc_get_modes(intel_output);
intel_i2c_destroy(ddcbus);
end:
return ret;
}
static int intel_crt_set_property(struct drm_connector *connector,