[PATCH 4/6] drm: scrambling support in drm layer

[Ville Syrjälä]

On Thu, Feb 02, 2017 at 03:46:55PM +0530, Sharma, Shashank wrote:
> Regards
> 
> Shashank
> 
> 
> On 2/2/2017 3:21 PM, Ville Syrjälä wrote:
> > On Thu, Feb 02, 2017 at 11:18:51AM +0530, Sharma, Shashank wrote:
> >> Regards
> >>
> >> Shashank
> >>
> >>
> >> On 2/1/2017 10:02 PM, Ville Syrjälä wrote:
> >>> On Wed, Feb 01, 2017 at 06:14:39PM +0530, Shashank Sharma wrote:
> >>>> HDMI 2.0 spec mandates scrambling for modes with pixel clock higher
> >>>> than 340Mhz. This patch adds few new functions in drm layer for
> >>>> core drivers to enable/disable scrambling.
> >>>>
> >>>> This patch adds:
> >>>> - A function to detect scrambling support parsing HF-VSDB
> >>>> - A function to check scrambling status runtime using SCDC read.
> >>>> - Two functions to enable/disable scrambling using SCDC read/write.
> >>>> - Few new bools to reflect scrambling support and status.
> >>>>
> >>>> Signed-off-by: Shashank Sharma <shashank.sharma at intel.com>
> >>>> ---
> >>>>    drivers/gpu/drm/drm_edid.c  | 131 +++++++++++++++++++++++++++++++++++++++++++-
> >>>>    include/drm/drm_connector.h |  24 ++++++++
> >>>>    include/drm/drm_edid.h      |   6 +-
> >>>>    3 files changed, 159 insertions(+), 2 deletions(-)
> >>>>
> >>>> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> >>>> index 37902e5..f0d940a 100644
> >>>> --- a/drivers/gpu/drm/drm_edid.c
> >>>> +++ b/drivers/gpu/drm/drm_edid.c
> >>>> @@ -37,6 +37,7 @@
> >>>>    #include <drm/drm_edid.h>
> >>>>    #include <drm/drm_encoder.h>
> >>>>    #include <drm/drm_displayid.h>
> >>>> +#include <drm/drm_scdc_helper.h>
> >>>>    
> >>>>    #define version_greater(edid, maj, min) \
> >>>>    	(((edid)->version > (maj)) || \
> >>>> @@ -3814,6 +3815,132 @@ static void drm_detect_hdmi_scdc(struct drm_connector *connector,
> >>>>    	}
> >>>>    }
> >>>>    
> >>>> +static void drm_detect_hdmi_scrambling(struct drm_connector *connector,
> >>>> +				 const u8 *hf_vsdb)
> >>> That names seems off. Should probably be drm_parse_hdmi_forum_vsdb() or
> >>> something.
> >> Actually, unlike the last patch set, we are not parsing the whole
> >> hf_vsdb, but parsing it only for
> >> scrambling status byte (hf_vsdb[5]). But may be I can make it
> >> drm_detect_scrambling_from_hfvsdb
> >> ot something similar. We will have more hf_vsdb parsing for 3d flags,
> >> yuv420_deep_color etc.
> > Well, so far I'm not seeing much point in splitting it up. So I'd stuff
> > it all into one place, for now at least.
> I had published a patch just doing as you suggested which was parsing 
> complete hf-vsdb in one shot, and adding info in
> hdmi_info structure, to accommodate it.
> (Patch https://patchwork.freedesktop.org/patch/128963/ and 
> https://patchwork.freedesktop.org/patch/128962/)
> 
> But you gave a review comment not to add anything which is not being 
> used in the patch series:
> https://patchwork.freedesktop.org/patch/128962/

That's doesn't require the things that are left to be split into
separate functions.

> 
> That was the only reason I have split hf-vsdb parsing patch into 3 parts
> - parse SCDC and scrambling info (here)
> - with YUV420 deep color ( upcoming )
> - with 3d handling (upcoming)
> 
> So I am confused, split or no split :-) ?
> 
> - Shashank

-- 
Ville Syrjälä
Intel OTC