Re: [PATCH] drm/i915: set the AVI VIC of the HDMI mode

[Thierry Reding <thierry.reding@avionic-design.de>]

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On Wed, Nov 21, 2012 at 01:39:48PM -0200, Paulo Zanoni wrote:
> From: Paulo Zanoni <paulo.r.zanoni@intel.com>
> 
> We currently set "0" as the VIC value of the AVI InfoFrames. According
> to the specs this should be fine and work for every mode, so to my
> point of view we can't consider the current behavior as a bug. The
> problem is that  we recently received a bug report (Kernel bug #50371)
> from a user that has an AV receiver that gives a black screen for any
> mode with VIC set to 0.
> 
> So in order to make at least some modes work for him, this patch sets
> the correct VIC number when sending AVI InfoFrames. We add a generic
> drm function to calculate the VIC number and then call it from the
> i915 driver.
> 
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=50371
> Cc: Thierry Reding <thierry.reding@avionic-design.de>
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
> ---
>  drivers/gpu/drm/drm_edid.c        |   19 +++++++++++++++++++
>  drivers/gpu/drm/drm_modes.c       |    3 ++-
>  drivers/gpu/drm/i915/intel_hdmi.c |    2 ++
>  include/drm/drm_crtc.h            |    4 +++-
>  4 files changed, 26 insertions(+), 2 deletions(-)
> 
> Patch applies on top of Daniel's drm-intel-next-queued. I'm not sure who exactly
> is going to merge this (Dave or Daniel).
> 
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index fadcd44..c57fc46 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -2062,3 +2062,22 @@ int drm_add_modes_noedid(struct drm_connector *connector,
>  	return num_modes;
>  }
>  EXPORT_SYMBOL(drm_add_modes_noedid);
> +
> +/**
> + * drm_mode_vic - return the CEA-861 VIC of a given mode

The name in the comment here doesn't match the actual function name.

> + * @mode: mode
> + *
> + * RETURNS:
> + * The VIC number, 0 in case it's not a CEA-861 mode.
> + */
> +uint8_t drm_mode_cea_vic(const struct drm_display_mode *mode)

I understand the reason for returning an uint8_t here, but ...

> +{
> +	uint8_t i;
> +
> +	for (i = 0; i < drm_num_cea_modes; i++)

... maybe unsigned int would be better for the iteration variable here.
Looking at drm_edid_modes.h, drm_num_cea_modes is actually signed, which
isn't necessary to store an array size, so maybe that should be changed
as well.

> +		if (drm_mode_equal(mode, &edid_cea_modes[i]))
> +			return i + 1;
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(drm_mode_cea_vic);
> diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
> index 59450f3..9ef6750 100644
> --- a/drivers/gpu/drm/drm_modes.c
> +++ b/drivers/gpu/drm/drm_modes.c
> @@ -768,7 +768,8 @@ EXPORT_SYMBOL(drm_mode_duplicate);
>   * RETURNS:
>   * True if the modes are equal, false otherwise.
>   */
> -bool drm_mode_equal(struct drm_display_mode *mode1, struct drm_display_mode *mode2)
> +bool drm_mode_equal(const struct drm_display_mode *mode1,
> +		    const struct drm_display_mode *mode2)

I think this change warrants a separate commit.

Thierry

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