[Intel-gfx] [PATCH v3 1/3] drm: Create new structure for HDMI info

[Ville Syrjälä]

On Thu, Dec 22, 2016 at 10:02:26AM +0000, Jose Abreu wrote:
> Hi Shashank,
> 
> 
> On 21-12-2016 15:29, Shashank Sharma wrote:
> 
> [snip]
> 
> > +
> > +	/**
> > +	 * @edid_yuv420_dc_modes: bpc for deep color yuv420 encoding.
> > +	 * various sinks can support 10/12/16 bit per channel deep
> > +	 * color encoding. edid_yuv420_dc_modes = 0 means sink doesn't
> > +	 * support deep color yuv420 encoding.
> > +	 */
> > +	u8 edid_yuv420_dc_modes;
> > +
> > +
> > +#define DRM_HFVSDB_SCDC_SUPPORT	(1<<7)
> > +#define DRM_HFVSDB_SCDC_RR_CAP		(1<<6)
> > +#define DRM_HFVSDB_SCRAMBLING		(1<<3)
> > +#define DRM_HFVSDB_INDEPENDENT_VIEW	(1<<2)
> > +#define DRM_HFVSDB_DUAL_VIEW		(1<<1)
> > +#define DRM_HFVSDB_3D_OSD		(1<<0)
> > +
> > +	/**
> > +	 * @scdc_supported: Sink supports SCDC functionality.
> > +	 */
> > +	bool scdc_supported;
> > +
> > +	/**
> > +	 * @scdc_rr_cap: Sink has SCDC read request capability.
> > +	 */
> > +	bool scdc_rr_cap;
> > +
> > +	/**
> > +	 * @scrambling: Sync supports scrambling for <=340 Mcsc TMDS
> > +	 * char rates. Above 340 Mcsc rates, scrambling is always reqd.
> > +	 */
> > +	bool scrambling;
> > +
> > +	/**
> > +	 * @independent_view_3d: Sink supports 3d independent view signaling
> > +	 * in HF-VSIF.
> > +	 */
> > +	bool independent_view_3d;
> > +
> > +	/**
> > +	 * @dual_view_3d: Sink supports 3d dual view signaling in HF-VSIF.
> > +	 */
> > +	bool dual_view_3d;
> > +
> > +	/**
> > +	 * @osd_disparity_3d: Sink supports 3d osd disparity indication
> > +	 * in HF-VSIF.
> > +	 */
> > +	bool osd_disparity_3d;
> > +};
> 
> [snip]
> 
> I thought we agreed in only adding these fields
> (edid_yuv420_dc_modes, scdc_supported, scdc_rr_cap, scrambling,
> independent_view_3d, dual_view_3d, osd_disparity_3d) in patch 2.
> I think it makes sense because you are only using them after that
> patch. Though, I would like to hear more comments about this as I
> am quite new to dri-devel.

Generally you shouldn't add stuff you don't use. In this seires nothing
actually uses any of of this stuff, so I don't think we should add
any of it.

The only piece of information actually used is the max TMDS clock, so
parsing that does make sense. But I think that might be buggy as the
patch will go ahead and parse both the old and new HDMI data blocks.
IIRC the spec did have some words about which one should be used in
which case. I don't think I spotted anything matching that in these
patches.

-- 
Ville Syrjälä
Intel OTC