> -----Original Message-----
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> Sent: Tuesday, September 29, 2020 9:48 PM
> To: Shankar, Uma <uma.shankar@xxxxxxxxx>
> Cc: intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> Subject: Re: [v6 04/11] drm/i915/display: Enable BT2020 for HDR on LSPCON
> devices
>
> On Tue, Sep 15, 2020 at 02:30:40AM +0530, Uma Shankar wrote:
> > Enable Colorspace as BT2020 if driving HDR content.Sending Colorimetry
> > data for HDR using AVI infoframe. LSPCON firmware expects this and
> > though SOC drives DP, for HDMI panel AVI infoframe is sent to the
> > LSPCON device which transfers the same to HDMI sink.
> >
> > v2: Dropped state managed in drm core as per Jani Nikula's suggestion.
> >
> > Signed-off-by: Uma Shankar <uma.shankar@xxxxxxxxx>
> > ---
> > drivers/gpu/drm/i915/display/intel_lspcon.c | 18 ++++++++++++++++++
> > 1 file changed, 18 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_lspcon.c
> > b/drivers/gpu/drm/i915/display/intel_lspcon.c
> > index fd05210f4405..b0ca494f1110 100644
> > --- a/drivers/gpu/drm/i915/display/intel_lspcon.c
> > +++ b/drivers/gpu/drm/i915/display/intel_lspcon.c
> > @@ -507,6 +507,11 @@ void lspcon_read_infoframe(struct intel_encoder
> *encoder,
> > /* FIXME implement this */
> > }
> >
> > +/* HDMI HDR Colorspace Spec Definitions */
> > +#define NORMAL_COLORIMETRY_MASK 0x3
> > +#define EXTENDED_COLORIMETRY_MASK 0x7
> > +#define HDMI_COLORIMETRY_BT2020_YCC ((3 << 0) | (6 << 2) | (0 << 5))
> > +
> > void lspcon_set_infoframes(struct intel_encoder *encoder,
> > bool enable,
> > const struct intel_crtc_state *crtc_state, @@ -551,6
> +556,19 @@
> > void lspcon_set_infoframes(struct intel_encoder *encoder,
> > HDMI_QUANTIZATION_RANGE_LIMITED
> :
> > HDMI_QUANTIZATION_RANGE_FULL);
> >
> > + /*
> > + * Set BT2020 colorspace if driving HDR data
> > + * ToDo: Make this generic and expose all colorspaces for lspcon
> > + */
> > + if (lspcon->active && lspcon->hdr_supported) {
> > + frame.avi.colorimetry =
> > + HDMI_COLORIMETRY_BT2020_YCC &
> > + NORMAL_COLORIMETRY_MASK;
> > + frame.avi.extended_colorimetry =
> > + (HDMI_COLORIMETRY_BT2020_YCC >> 2) &
> > + EXTENDED_COLORIMETRY_MASK;
> > + }
>
> drm_hdmi_avi_infoframe_colorspace().
>
> Also pls try to match intel_hdmi_compute_avi_infoframe() as closesly as possible
> if we can't just outright reuse it. That will make it easier to spot differences
> between the two.
Sure, will rectify it.
> > +
> > ret = hdmi_infoframe_pack(&frame, buf, sizeof(buf));
> > if (ret < 0) {
> > DRM_ERROR("Failed to pack AVI IF\n");
> > --
> > 2.26.2
>
> --
> Ville Syrjälä
> Intel
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