Re: [PATCH 05/18] video/hdmi: Add an enum for HDMI packet types

Ville Syrjälä
2018-09-21T15:07:12Z

On Fri, Sep 21, 2018 at 04:12:36PM +0200, Hans Verkuil wrote:
> On 09/21/18 16:01, Ville Syrjälä wrote:
> > On Fri, Sep 21, 2018 at 10:41:46AM +0200, Hans Verkuil wrote:
> >> On 09/20/18 20:51, Ville Syrjala wrote:
> >>> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> >>>
> >>> We'll be wanting to send more than just infoframes over HDMI. So add an
> >>> enum for other packet types.
> >>>
> >>> TODO: Maybe just include the infoframe types in the packet type enum
> >>> and get rid of the infoframe type enum?
> >>
> >> I think that's better, IMHO. With a comment that the types starting with
> >> 0x81 are defined in CTA-861-G.
> >>
> >> It's really the same byte that is being checked, so having two enums is
> >> a bit misleading. The main difference is really which standard defines
> >> the packet types.
> >
> > Right. The only slight annoyance is that we'll get a bunch of warnings
> > from the compiler if we don't handle all the enum valus in the switch
> > statements. If we want to avoid that I guess I could limit this
> > to just the null, gcp and gamut metadata packets initially and try to
> > write some actual code for them. Those three are the only ones we
> > care about in i915 at the moment.
>
> Note that I don't have a terribly strong opinion on this, so if using
> one enum instead of two causes more problems than it is worth, then
> that's fine with me as well.
>
> But you asked, and given a choice with all other things being equal,
> then one enum has my preference.

I do agree that it would seem nicer.

But I'm a bit busy with other things at the moment so I might want
to leave it like this for now and revisit the topic in the
hopefully-not-too-distant future.

>
> Regards,
>
> Hans
>
> >
> >>
> >> Regards,
> >>
> >> Hans
> >>
> >>>
> >>> Cc: Thierry Reding <thierry.reding@gmail.com>
> >>> Cc: Hans Verkuil <hans.verkuil@cisco.com>
> >>> Cc: linux-media@vger.kernel.org
> >>> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> >>> ---
> >>> include/linux/hdmi.h | 15 +++++++++++++++
> >>> 1 file changed, 15 insertions(+)
> >>>
> >>> diff --git a/include/linux/hdmi.h b/include/linux/hdmi.h
> >>> index c76b50a48e48..80521d9591a1 100644
> >>> --- a/include/linux/hdmi.h
> >>> +++ b/include/linux/hdmi.h
> >>> @@ -27,6 +27,21 @@
> >>> #include <linux/types.h>
> >>> #include <linux/device.h>
> >>>
> >>> +enum hdmi_packet_type {
> >>> + HDMI_PACKET_TYPE_NULL = 0x00,
> >>> + HDMI_PACKET_TYPE_AUDIO_CLOCK_REGEN = 0x01,
> >>> + HDMI_PACKET_TYPE_AUDIO_SAMPLE = 0x02,
> >>> + HDMI_PACKET_TYPE_GENERAL_CONTROL = 0x03,
> >>> + HDMI_PACKET_TYPE_AUDIO_CP = 0x04,
> >>> + HDMI_PACKET_TYPE_ISRC1 = 0x05,
> >>> + HDMI_PACKET_TYPE_ISRC2 = 0x06,
> >>> + HDMI_PACKET_TYPE_ONE_BIT_AUDIO_SAMPLE = 0x07,
> >>> + HDMI_PACKET_TYPE_DST_AUDIO = 0x08,
> >>> + HDMI_PACKET_TYPE_HBR_AUDIO_STREAM = 0x09,
> >>> + HDMI_PACKET_TYPE_GAMUT_METADATA = 0x0a,
> >>> + /* + enum hdmi_infoframe_type */
> >>> +};
> >>> +
> >>> enum hdmi_infoframe_type {
> >>> HDMI_INFOFRAME_TYPE_VENDOR = 0x81,
> >>> HDMI_INFOFRAME_TYPE_AVI = 0x82,
> >>>
> >

--
Ville Syrjälä
Intel
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