[Intel-gfx] [PATCH] drm/i915: crt fetch EDID by DVI-I converter sync up with 2D driver

[Eric Anholt]

On Fri, 2009-05-22 at 17:50 +0800, Ma Ling wrote:
> Usually crt mainly get modes via GPIOA ports.
> However we need to probe all possible ports for
> DVI-I, which could be wired to GPIOD or GPIOE,
> and fetch our desired EDID, i.e on DG45ID platform 
> we successfully fetch EDID by GPIOD port.
> 
> Signed-off-by: Ma Ling <ling.ma at intel.com>

Doing setup and teardown of I2C buses for each detect seems crazy.
Also, this behavior should probably be limited to affected chipsets --
presumably this doesn't apply to non-HDMI ones?  And I bet we could pull
info out of the BIOS on what the correct GPIO to use is.

Also, please figure out what's going on with your mailer or commit
message editing that's resulting in unusual spaces getting inserted, so
I don't have to edit them all for you.  (just to show that it's not me,
check out the commit message in the message source on
http://lists.freedesktop.org/archives/intel-gfx/2009-May/002504.html)

> ---
>  drivers/gpu/drm/i915/intel_crt.c |   42 +++++++++++++++++++++++++++++++++++++-
>  1 files changed, 41 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
> index 19148c3..91e57a7 100644
> --- a/drivers/gpu/drm/i915/intel_crt.c
> +++ b/drivers/gpu/drm/i915/intel_crt.c
> @@ -228,8 +228,48 @@ 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;
> +
> +	ddcbus = intel_output->ddc_bus;
> +
> +	ret = intel_ddc_get_modes(intel_output);
> +	if (ret)
> +		goto end;
> +
> +	/* 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) {
> +		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(intel_output->ddc_bus);
> +
> +	if (ret)
> +		goto end;
> +
> +	intel_output->ddc_bus =
> +		intel_i2c_create(connector->dev, GPIOE, "CRTDDC_E");
> +
> +	if (!intel_output->ddc_bus) {
> +		dev_printk(KERN_ERR, &connector->dev->pdev->dev,
> +			   "DDC bus registration failed for CRTDDC_D.\n");
> +		goto end;
> +	}
> +	/* Try to get modes by GPIOE port */
> +	ret = intel_ddc_get_modes(intel_output);
> +	intel_i2c_destroy(intel_output->ddc_bus);
> +
> +end:
> +	intel_output->ddc_bus = ddcbus;
> +	return ret;
> +
>  }
>  
>  static int intel_crt_set_property(struct drm_connector *connector,
-- 
Eric Anholt
eric at anholt.net                         eric.anholt at intel.com


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