drm/i915: crt fetch EDID by DVI-I converter on G4x platform
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>
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@ -428,8 +428,34 @@ static void intel_crt_destroy(struct drm_connector *connector)
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static int intel_crt_get_modes(struct drm_connector *connector)
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{
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int ret;
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struct intel_output *intel_output = to_intel_output(connector);
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return intel_ddc_get_modes(intel_output);
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struct intel_i2c_chan *ddcbus;
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struct drm_device *dev = connector->dev;
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ret = intel_ddc_get_modes(intel_output);
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if (ret || !IS_G4X(dev))
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goto end;
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ddcbus = intel_output->ddc_bus;
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/* Try to probe digital port for output in DVI-I -> VGA mode. */
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intel_output->ddc_bus =
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intel_i2c_create(connector->dev, GPIOD, "CRTDDC_D");
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if (!intel_output->ddc_bus) {
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intel_output->ddc_bus = ddcbus;
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dev_printk(KERN_ERR, &connector->dev->pdev->dev,
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"DDC bus registration failed for CRTDDC_D.\n");
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goto end;
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}
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/* Try to get modes by GPIOD port */
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ret = intel_ddc_get_modes(intel_output);
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intel_i2c_destroy(ddcbus);
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end:
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return ret;
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}
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static int intel_crt_set_property(struct drm_connector *connector,
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