On Tue, Oct 19, 2021 at 09:16:33PM +0300, Jani Nikula wrote:
> On Fri, 15 Oct 2021, Ville Syrjala <ville.syrj...@linux.intel.com> wrote:
> > From: Ville Syrjälä <ville.syrj...@linux.intel.com>
> >
> > Rename intel_hdmi_port_clock() into intel_hdmi_tmds_clock(), and
> > move the 4:2:0 TMDS clock halving into intel_hdmi_tmds_clock() so
> > the callers don't have to worry about such details.
> >
> > Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
> > ---
> > drivers/gpu/drm/i915/display/intel_hdmi.c | 25 +++++++++++------------
> > 1 file changed, 12 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c
> > b/drivers/gpu/drm/i915/display/intel_hdmi.c
> > index 37ce8a621973..e97c83535965 100644
> > --- a/drivers/gpu/drm/i915/display/intel_hdmi.c
> > +++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
> > @@ -1868,8 +1868,12 @@ hdmi_port_clock_valid(struct intel_hdmi *hdmi,
> > return MODE_OK;
> > }
> >
> > -static int intel_hdmi_port_clock(int clock, int bpc)
> > +static int intel_hdmi_tmds_clock(int clock, int bpc, bool ycbcr420_output)
> > {
> > + /* YCBCR420 TMDS rate requirement is half the pixel clock */
> > + if (ycbcr420_output)
> > + clock /= 2;
> > +
> > /*
> > * Need to adjust the port link by:
> > * 1.5x for 12bpc
> > @@ -1932,25 +1936,22 @@ intel_hdmi_mode_clock_valid(struct drm_connector
> > *connector, int clock,
> > struct intel_hdmi *hdmi =
> > intel_attached_hdmi(to_intel_connector(connector));
> > enum drm_mode_status status;
> >
> > - if (ycbcr420_output)
> > - clock /= 2;
> > -
> > /* check if we can do 8bpc */
> > - status = hdmi_port_clock_valid(hdmi, intel_hdmi_port_clock(clock, 8),
> > + status = hdmi_port_clock_valid(hdmi, intel_hdmi_tmds_clock(clock, 8,
> > ycbcr420_output),
> > true, has_hdmi_sink);
> >
> > /* if we can't do 8bpc we may still be able to do 12bpc */
> > if (status != MODE_OK &&
> > intel_hdmi_source_bpc_possible(i915, 12) &&
> > intel_hdmi_sink_bpc_possible(connector, 12, has_hdmi_sink,
> > ycbcr420_output))
> > - status = hdmi_port_clock_valid(hdmi,
> > intel_hdmi_port_clock(clock, 12),
> > + status = hdmi_port_clock_valid(hdmi,
> > intel_hdmi_tmds_clock(clock, 12, ycbcr420_output),
> > true, has_hdmi_sink);
> >
> > /* if we can't do 8,12bpc we may still be able to do 10bpc */
> > if (status != MODE_OK &&
> > intel_hdmi_source_bpc_possible(i915, 10) &&
> > intel_hdmi_sink_bpc_possible(connector, 10, has_hdmi_sink,
> > ycbcr420_output))
> > - status = hdmi_port_clock_valid(hdmi,
> > intel_hdmi_port_clock(clock, 10),
> > + status = hdmi_port_clock_valid(hdmi,
> > intel_hdmi_tmds_clock(clock, 10, ycbcr420_output),
> > true, has_hdmi_sink);
> >
> > return status;
> > @@ -2057,12 +2058,13 @@ static int intel_hdmi_compute_bpc(struct
> > intel_encoder *encoder,
> > int clock)
> > {
> > struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder);
> > + bool ycbcr420_output = intel_hdmi_is_ycbcr420(crtc_state);
> > int bpc;
> >
> > for (bpc = 12; bpc >= 10; bpc -= 2) {
> > if (hdmi_deep_color_possible(crtc_state, bpc) &&
> > hdmi_port_clock_valid(intel_hdmi,
> > - intel_hdmi_port_clock(clock, bpc),
> > + intel_hdmi_tmds_clock(clock, bpc,
> > ycbcr420_output),
>
> Does not having the clock /= 2 here mean the check was bogus before this
> patch?
Previously the /2 was done by the caller (intel_hdmi_compute_clock()).
So nothing should be different here.
>
> BR,
> Jani.
>
>
> > true, crtc_state->has_hdmi_sink) ==
> > MODE_OK)
> > return bpc;
> > }
> > @@ -2082,13 +2084,10 @@ static int intel_hdmi_compute_clock(struct
> > intel_encoder *encoder,
> > if (adjusted_mode->flags & DRM_MODE_FLAG_DBLCLK)
> > clock *= 2;
> >
> > - /* YCBCR420 TMDS rate requirement is half the pixel clock */
> > - if (intel_hdmi_is_ycbcr420(crtc_state))
> > - clock /= 2;
> > -
> > bpc = intel_hdmi_compute_bpc(encoder, crtc_state, clock);
> >
> > - crtc_state->port_clock = intel_hdmi_port_clock(clock, bpc);
> > + crtc_state->port_clock = intel_hdmi_tmds_clock(clock, bpc,
> > +
> > intel_hdmi_is_ycbcr420(crtc_state));
> >
> > /*
> > * pipe_bpp could already be below 8bpc due to
>
> --
> Jani Nikula, Intel Open Source Graphics Center
--
Ville Syrjälä
Intel
