Gen9+ platforms allow CRTC's to be programmed with a background/canvas color below the programmable planes. Let's expose this for use by compositors.

v2: - Split out bgcolor sanitization and programming of csc/gamma bits to a separate patch that we can land before the ABI changes are ready to go in. (Ville) - Change a temporary variable name to be more consistent with other similar functions. (Ville) - Change register name to SKL_CANVAS for consistency with the CHV_CANVAS register.

v3: - Switch register name back to SKL_BOTTOM_COLOR. (Ville) - Use non-_FW register write. (Ville) - Minor parameter rename for consistency. (Ville)

v4: - Removed use of bgcolor_changed flag.

v5: - s/uint64_t/u64/

Cc: dri-devel@lists.freedesktop.org Cc: wei.c.li@intel.com Cc: harish.krupo.kps@intel.com Cc: Ville Syrjälä ville.syrjala@linux.intel.com Signed-off-by: Matt Roper matthew.d.roper@intel.com Reviewed-by: Ville Syrjälä ville.syrjala@linux.intel.com --- drivers/gpu/drm/i915/i915_debugfs.c | 9 +++++++ drivers/gpu/drm/i915/intel_display.c | 46 +++++++++++++++++++++++++++--------- 2 files changed, 44 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index fa2c226fc779..e96fef9fa97c 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -3092,6 +3092,15 @@ static int i915_display_info(struct seq_file *m, void *unused) intel_plane_info(m, crtc); }

+ if (INTEL_GEN(dev_priv) >= 9 && pipe_config->base.active) { + u64 background = pipe_config->base.bgcolor; + + seq_printf(m, "\tbackground color (10bpc): r=%x g=%x b=%x\n", + DRM_ARGB_RED(background, 10), + DRM_ARGB_GREEN(background, 10), + DRM_ARGB_BLUE(background, 10)); + } + seq_printf(m, "\tunderrun reporting: cpu=%s pch=%s \n", yesno(!crtc->cpu_fifo_underrun_disabled), yesno(!crtc->pch_fifo_underrun_disabled)); diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index a6d8985fe2e0..469480fe01a4 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -3896,6 +3896,28 @@ void intel_finish_reset(struct drm_i915_private *dev_priv) clear_bit(I915_RESET_MODESET, &dev_priv->gpu_error.flags); }

+static void +skl_update_background_color(const struct intel_crtc_state *crtc_state) +{ + struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc); + struct drm_i915_private *dev_priv = to_i915(crtc->base.dev); + u64 propval = crtc_state->base.bgcolor; + u32 tmp; + + /* Hardware is programmed with 10 bits of precision */ + tmp = DRM_ARGB_RED(propval, 10) << 20 + | DRM_ARGB_GREEN(propval, 10) << 10 + | DRM_ARGB_BLUE(propval, 10); + + /* + * Set CSC and gamma for bottom color to ensure background pixels + * receive the same color transformations as plane content. + */ + tmp |= SKL_BOTTOM_COLOR_CSC_ENABLE | SKL_BOTTOM_COLOR_GAMMA_ENABLE; + + I915_WRITE(SKL_BOTTOM_COLOR(crtc->pipe), tmp); +} + static void intel_update_pipe_config(const struct intel_crtc_state *old_crtc_state, const struct intel_crtc_state *new_crtc_state) { @@ -3931,15 +3953,8 @@ static void intel_update_pipe_config(const struct intel_crtc_state *old_crtc_sta 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_BOTTOM_COLOR(crtc->pipe), - SKL_BOTTOM_COLOR_GAMMA_ENABLE | - SKL_BOTTOM_COLOR_CSC_ENABLE); + skl_update_background_color(new_crtc_state); }

static void intel_fdi_normal_train(struct intel_crtc *crtc) @@ -11042,6 +11057,8 @@ static int intel_crtc_atomic_check(struct drm_crtc *crtc, struct intel_crtc *intel_crtc = to_intel_crtc(crtc); struct intel_crtc_state *pipe_config = to_intel_crtc_state(crtc_state); + struct drm_crtc_state *old_crtc_state = + drm_atomic_get_old_crtc_state(crtc_state->state, crtc); int ret; bool mode_changed = needs_modeset(crtc_state);

@@ -11069,6 +11086,9 @@ static int intel_crtc_atomic_check(struct drm_crtc *crtc, crtc_state->planes_changed = true; }

+ if (crtc_state->bgcolor != old_crtc_state->bgcolor) + pipe_config->update_pipe = true; + ret = 0; if (dev_priv->display.compute_pipe_wm) { ret = dev_priv->display.compute_pipe_wm(pipe_config); @@ -14238,6 +14258,9 @@ static int intel_crtc_init(struct drm_i915_private *dev_priv, enum pipe pipe)

WARN_ON(drm_crtc_index(&intel_crtc->base) != intel_crtc->pipe);

+ if (INTEL_GEN(dev_priv) >= 9) + drm_crtc_add_bgcolor_property(&intel_crtc->base); + return 0;

fail: @@ -15480,6 +15503,9 @@ static void intel_sanitize_crtc(struct intel_crtc *crtc, struct intel_crtc_state *crtc_state = to_intel_crtc_state(crtc->base.state); enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;

+ /* Always force bgcolor to solid black */ + crtc_state->base.bgcolor = drm_argb(16, 0xFFFF, 0, 0, 0); + /* Clear any frame start delays used for debugging left by the BIOS */ if (crtc->active && !transcoder_is_dsi(cpu_transcoder)) { i915_reg_t reg = PIPECONF(cpu_transcoder); @@ -15506,9 +15532,7 @@ static void intel_sanitize_crtc(struct intel_crtc *crtc, * gamma and CSC to match how we program our planes. */ if (INTEL_GEN(dev_priv) >= 9) - I915_WRITE(SKL_BOTTOM_COLOR(crtc->pipe), - SKL_BOTTOM_COLOR_GAMMA_ENABLE | - SKL_BOTTOM_COLOR_CSC_ENABLE); + skl_update_background_color(crtc_state); }

/* Adjust the state of the output pipe according to whether we