From: "Ville Syrjälä" <ville.syrjala@linux.intel.com>
To: Jani Nikula <jani.nikula@linux.intel.com>
Cc: intel-gfx@lists.freedesktop.org
Subject: Re: [Intel-gfx] [PATCH] drm/i915: Only enable DFP 4:4:4->4:2:0 conversion when outputting YCbCr 4:4:4
Date: Thu, 14 Jan 2021 17:06:00 +0200 [thread overview]
Message-ID: <YABd2J3L+MTNV42w@intel.com> (raw)
In-Reply-To: <87v9c0q8pk.fsf@intel.com>
On Thu, Jan 14, 2021 at 09:27:35AM +0200, Jani Nikula wrote:
> On Mon, 11 Jan 2021, Ville Syrjala <ville.syrjala@linux.intel.com> wrote:
> > From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> >
> > Let's not enable the 4:4:4->4:2:0 conversion bit in the DFP unless we're
> > actually outputting YCbCr 4:4:4. It would appear some protocol
> > converters blindy consult this bit even when the source is outputting
> > RGB, resulting in a visual mess.
> >
> > Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/2914
> > Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
>
> Fixes: 181567aa9f0d ("drm/i915: Do YCbCr 444->420 conversion via DP protocol converters")
> Cc: <stable@vger.kernel.org> # v5.10+
>
> Right?
Not sure I should to add the stable tag directly since it apparently
applies cleanly but does not build. So needs a custom backport.
>
> Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Ta.
>
> > ---
> > drivers/gpu/drm/i915/display/intel_dp.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> > index 4f190a82d4ad..aa30ef9f6906 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> > @@ -4368,8 +4368,8 @@ void intel_dp_configure_protocol_converter(struct intel_dp *intel_dp,
> > drm_dbg_kms(&i915->drm, "Failed to set protocol converter HDMI mode to %s\n",
> > enableddisabled(intel_dp->has_hdmi_sink));
> >
> > - tmp = intel_dp->dfp.ycbcr_444_to_420 ?
> > - DP_CONVERSION_TO_YCBCR420_ENABLE : 0;
> > + tmp = crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR444 &&
> > + intel_dp->dfp.ycbcr_444_to_420 ? DP_CONVERSION_TO_YCBCR420_ENABLE : 0;
> >
> > if (drm_dp_dpcd_writeb(&intel_dp->aux,
> > DP_PROTOCOL_CONVERTER_CONTROL_1, tmp) != 1)
>
> --
> Jani Nikula, Intel Open Source Graphics Center
--
Ville Syrjälä
Intel
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prev parent reply other threads:[~2021-01-14 15:06 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-11 16:41 [Intel-gfx] [PATCH] drm/i915: Only enable DFP 4:4:4->4:2:0 conversion when outputting YCbCr 4:4:4 Ville Syrjala
2021-01-11 17:59 ` [Intel-gfx] ✗ Fi.CI.BAT: failure for " Patchwork
2021-01-12 1:53 ` [Intel-gfx] ✓ Fi.CI.BAT: success for drm/i915: Only enable DFP 4:4:4->4:2:0 conversion when outputting YCbCr 4:4:4 (rev2) Patchwork
2021-01-12 4:23 ` [Intel-gfx] ✗ Fi.CI.IGT: failure " Patchwork
2021-01-14 7:27 ` [Intel-gfx] [PATCH] drm/i915: Only enable DFP 4:4:4->4:2:0 conversion when outputting YCbCr 4:4:4 Jani Nikula
2021-01-14 15:06 ` Ville Syrjälä [this message]
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