Re: [PATCH] drm/edid: Fill PAR in AVI infoframe based on CEA mode list

[Daniel Vetter <daniel@ffwll.ch>]

On Tue, Apr 01, 2014 at 08:06:04AM +0530, Vandana Kannan wrote:
> On Apr-01-2014 12:35 AM, Daniel Vetter wrote:
> > On Fri, Mar 21, 2014 at 08:31:29AM +0530, Vandana Kannan wrote:
> >> Populate PAR in infoframe structure. If there is a user setting for PAR, then
> >> that value is set. Else, value is taken from CEA mode list if VIC is found.
> >> Else, PAR is calculated from resolution. If none of these conditions are
> >> satisfied, PAR is NONE as per initialization.
> >>
> >> As a next step, create a property that would enable a user space app to set
> >> aspect ratio. (will be pushed as a separate patch)
> >>
> >> Signed-off-by: Vandana Kannan <vandana.kannan@intel.com>
> >> Cc: Jesse Barnes <jesse.barnes@intel.com>
> >> Cc: Vijay Purushothaman <vijay.a.purushothaman@intel.com>
> >> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> >> Cc: intel-gfx@lists.freedesktop.org
> >> ---
> >>  drivers/gpu/drm/drm_edid.c |   34 ++++++++++++++++++++++++++++++++++
> >>  include/drm/drm_crtc.h     |    1 +
> >>  2 files changed, 35 insertions(+)
> >>
> >> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> >> index d4e3f9d..3db693f 100644
> >> --- a/drivers/gpu/drm/drm_edid.c
> >> +++ b/drivers/gpu/drm/drm_edid.c
> >> @@ -2452,6 +2452,21 @@ u8 drm_match_cea_mode(const struct drm_display_mode *to_match)
> >>  }
> >>  EXPORT_SYMBOL(drm_match_cea_mode);
> >>  
> >> +/**
> >> + * drm_get_cea_aspect_ratio - get the picture aspect ratio corresponding to
> >> + * the input VIC from the CEA mode list
> >> + *
> >> + * Returns picture aspect ratio
> >> + */
> >> +enum hdmi_picture_aspect drm_get_cea_aspect_ratio(const u8 video_code)
> >> +{
> >> +	/* return picture aspect ratio for video_code - 1 to access the
> >> +	 * right array element
> >> +	*/
> >> +	return edid_cea_modes[video_code-1].picture_aspect_ratio;
> >> +}
> >> +EXPORT_SYMBOL(drm_get_cea_aspect_ratio);
> >> +
> >>  /*
> >>   * Calculate the alternate clock for HDMI modes (those from the HDMI vendor
> >>   * specific block).
> >> @@ -3613,6 +3628,25 @@ drm_hdmi_avi_infoframe_from_display_mode(struct hdmi_avi_infoframe *frame,
> >>  	frame->video_code = drm_match_cea_mode(mode);
> >>  
> >>  	frame->picture_aspect = HDMI_PICTURE_ASPECT_NONE;
> >> +
> >> +	/* Populate picture aspect ratio from either CEA mode list or
> >> +	 *  user input
> >> +	*/
> >> +	if (mode->picture_aspect_ratio == HDMI_PICTURE_ASPECT_4_3 ||
> >> +		mode->picture_aspect_ratio == HDMI_PICTURE_ASPECT_16_9)
> >> +		frame->picture_aspect = mode->picture_aspect_ratio;
> > 
> > Please pardon my ignorance, but how can userspace actually set this part
> > of the mode? I couldn't find any code which sets this anywhere ...
> > -Daniel
> > 
> I have submitted a patch to enable user space to set picture aspect
> ratio through a property..
> drm/i915: Add property to set HDMI aspect ratio
> http://lists.freedesktop.org/archives/intel-gfx/2014-March/042403.html

Ah, that makes more sense. I think we should move the property also into
the drm core so that all drivers that want to expose this can use the same
property. Also if you have patches which depend upon each another in a
funtional way it's better to post them together in one series.
-Daniel

> -Vandana
> >> +	else if (frame->video_code > 0)
> >> +		frame->picture_aspect = drm_get_cea_aspect_ratio(
> >> +						frame->video_code);
> >> +	else {
> >> +		if (!(mode->vdisplay % 3) &&
> >> +			(((mode->vdisplay * 4) / 3) == mode->hdisplay))
> >> +			frame->picture_aspect = HDMI_PICTURE_ASPECT_4_3;
> >> +		else if (!(mode->vdisplay % 9) &&
> >> +			(((mode->vdisplay * 16) / 9) == mode->hdisplay))
> >> +			frame->picture_aspect = HDMI_PICTURE_ASPECT_16_9;
> >> +	}
> >> +
> >>  	frame->active_aspect = HDMI_ACTIVE_ASPECT_PICTURE;
> >>  	frame->scan_mode = HDMI_SCAN_MODE_UNDERSCAN;
> >>  
> >> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> >> index 27f828c..50dc55a 100644
> >> --- a/include/drm/drm_crtc.h
> >> +++ b/include/drm/drm_crtc.h
> >> @@ -983,6 +983,7 @@ extern int drm_mode_gamma_get_ioctl(struct drm_device *dev,
> >>  extern int drm_mode_gamma_set_ioctl(struct drm_device *dev,
> >>  				    void *data, struct drm_file *file_priv);
> >>  extern u8 drm_match_cea_mode(const struct drm_display_mode *to_match);
> >> +extern enum hdmi_picture_aspect drm_get_cea_aspect_ratio(const u8 video_code);
> >>  extern bool drm_detect_hdmi_monitor(struct edid *edid);
> >>  extern bool drm_detect_monitor_audio(struct edid *edid);
> >>  extern bool drm_rgb_quant_range_selectable(struct edid *edid);
> >> -- 
> >> 1.7.9.5
> >>
> >> _______________________________________________
> >> dri-devel mailing list
> >> dri-devel@lists.freedesktop.org
> >> http://lists.freedesktop.org/mailman/listinfo/dri-devel
> > 
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch