[PATCH v5 2/3] drm/i915/gen9+: Add support for pipe background color (v5)

Matt Roper
2019-01-31T23:55:07Z

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
--
2.14.5

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