On Tue, Nov 13, 2018 at 03:21:47PM -0800, Matt Roper wrote:
> We don't yet allow userspace to control the CRTC background color, but
> we should manually program the color to black to ensure the BIOS didn't
> leave us with some other color. We should also set the pipe gamma and
> pipe CSC bits so that the background color goes through the same color
> management transformations that a plane with black pixels would.
>
> Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
> ---
> We may want to land this patch before the rest of the series since it's
> still valuable even without the new ABI the rest of the series adds.
>
> drivers/gpu/drm/i915/i915_reg.h | 6 ++++++
> drivers/gpu/drm/i915/intel_display.c | 18 ++++++++++++++++++
> 2 files changed, 24 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index fe4b913e46ac..b92a721c9bcb 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -5662,6 +5662,12 @@ enum {
> #define PIPEMISC_DITHER_TYPE_SP (0 << 2)
> #define PIPEMISC(pipe) _MMIO_PIPE2(pipe, _PIPE_MISC_A)
>
> +/* Skylake+ pipe bottom (background) color */
> +#define _SKL_CANVAS_A 0x70034
> +#define SKL_CANVAS_GAMMA_ENABLE (1 << 31)
> +#define SKL_CANVAS_CSC_ENABLE (1 << 30)
> +#define SKL_CANVAS(pipe) _MMIO_PIPE2(pipe, _SKL_CANVAS_A)
Didn't the spec call this BOTTOM_COLOR or something like that?
> +
> #define VLV_DPFLIPSTAT _MMIO(VLV_DISPLAY_BASE + 0x70028)
> #define PIPEB_LINE_COMPARE_INT_EN (1 << 29)
> #define PIPEB_HLINE_INT_EN (1 << 28)
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 132e978227fb..1d089d93d88b 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -3868,6 +3868,15 @@ static void intel_update_pipe_config(const struct intel_crtc_state *old_crtc_sta
> else if (old_crtc_state->pch_pfit.enabled)
> ironlake_pfit_disable(old_crtc_state);
> }
> +
> + /*
> + * We don't (yet) allow userspace to control the pipe background color,
> + * so force it to black, but apply pipe gamma and CSC so that its
> + * handling will match how we program our planes.
> + */
> + if (INTEL_GEN(dev_priv) >= 9)
> + I915_WRITE(SKL_CANVAS(crtc->pipe),
> + SKL_CANVAS_GAMMA_ENABLE | SKL_CANVAS_CSC_ENABLE);
> }
>
> static void intel_fdi_normal_train(struct intel_crtc *crtc)
> @@ -15356,6 +15365,15 @@ static void intel_sanitize_crtc(struct intel_crtc *crtc,
> plane->base.type != DRM_PLANE_TYPE_PRIMARY)
> intel_plane_disable_noatomic(crtc, plane);
> }
> +
> + /*
> + * Disable any background color set by the BIOS, but enable the
> + * gamma and CSC to match how we program our planes.
> + */
> + if (INTEL_GEN(dev_priv) >= 9)
> + I915_WRITE(SKL_CANVAS(crtc->pipe),
> + SKL_CANVAS_GAMMA_ENABLE |
> + SKL_CANVAS_CSC_ENABLE);
> }
>
> /* Adjust the state of the output pipe according to whether we
> --
> 2.14.4
--
Ville Syrjälä
Intel
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