Add support for icl pipe degamma and gamma.
v2: Removed a POSTING_READ and corrected the Bit
Definition as per Maarten's comments.
v3: Addressed Matt's review comments. Removed rmw patterns
as suggested by Matt.
v4: Fixed Matt's review comments.
Signed-off-by: Uma Shankar <uma.shankar@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 3 ++
drivers/gpu/drm/i915/intel_color.c | 67 ++++++++++++++++++++++++++++++++++++++
2 files changed, 70 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 02af9b5..1852c33 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7092,6 +7092,9 @@ enum {
#define GAMMA_MODE_MODE_12BIT (2 << 0)
#define GAMMA_MODE_MODE_SPLIT (3 << 0)
+#define PRE_CSC_GAMMA_ENABLE (1 << 31)
+#define POST_CSC_GAMMA_ENABLE (1 << 30)
+
/* DMC/CSR */
#define CSR_PROGRAM(i) _MMIO(0x80000 + (i) * 4)
#define CSR_SSP_BASE_ADDR_GEN9 0x00002FC0
diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c
index f32e4a7..e72d8d6 100644
--- a/drivers/gpu/drm/i915/intel_color.c
+++ b/drivers/gpu/drm/i915/intel_color.c
@@ -534,6 +534,71 @@ static void glk_load_luts(struct intel_crtc_state *crtc_state)
POSTING_READ(GAMMA_MODE(pipe));
}
+static void icl_load_degamma_lut(struct intel_crtc_state *crtc_state)
+{
+ struct drm_device *dev = crtc_state->base.crtc->dev;
+ struct drm_i915_private *dev_priv = to_i915(dev);
+ enum pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
+ const uint32_t lut_size = INTEL_INFO(dev_priv)->color.degamma_lut_size;
+ uint32_t i;
+
+ /*
+ * When setting the auto-increment bit, the hardware seems to
+ * ignore the index bits, so we need to reset it to index 0
+ * separately.
+ */
+ I915_WRITE(PRE_CSC_GAMC_INDEX(pipe), 0);
+ I915_WRITE(PRE_CSC_GAMC_INDEX(pipe), PRE_CSC_GAMC_AUTO_INCREMENT);
+
+ if (crtc_state->base.degamma_lut) {
+ struct drm_color_lut *lut = crtc_state->base.degamma_lut->data;
+
+ for (i = 0; i < lut_size; i++) {
+ /*
+ * First 33 entries represent range from 0 to 1.0
+ * 34th and 35th entry will represent extended range
+ * inputs 3.0 and 7.0 respectively, currently clamped
+ * at 1.0. Since the precision is 16bit, the user value
+ * can be directly filled to register.
+ * ToDo: Extend to max 7.0.
+ */
+ I915_WRITE(PRE_CSC_GAMC_DATA(pipe), lut[i].red);
+ }
+ } else {
+ /* load a linear table. */
+ for (i = 0; i < lut_size; i++) {
+ uint32_t v = (i * (1 << 16)) / (lut_size - 1);
+
+ I915_WRITE(PRE_CSC_GAMC_DATA(pipe), v);
+ }
+ }
+
+ /* Clamp values > 1.0. */
+ while (i++ < 35)
+ I915_WRITE(PRE_CSC_GAMC_DATA(pipe), (1 << 16));
+}
+
+static void icl_load_luts(struct intel_crtc_state *crtc_state)
+{
+ struct drm_crtc *crtc = crtc_state->base.crtc;
+ struct drm_device *dev = crtc_state->base.crtc->dev;
+ struct drm_i915_private *dev_priv = to_i915(dev);
+ enum pipe pipe = to_intel_crtc(crtc)->pipe;
+ u32 gamma_mode = 0;
+
+ if (crtc_state_is_legacy_gamma(crtc_state)) {
+ haswell_load_luts(crtc_state);
+ return;
+ }
+
+ icl_load_degamma_lut(crtc_state);
+ bdw_load_gamma_lut(crtc_state, 0);
+
+ gamma_mode = GAMMA_MODE_MODE_10BIT | PRE_CSC_GAMMA_ENABLE
+ | POST_CSC_GAMMA_ENABLE;
+ I915_WRITE(GAMMA_MODE(pipe), gamma_mode);
+}
+
/* Loads the palette/gamma unit for the CRTC on CherryView. */
static void cherryview_load_luts(struct intel_crtc_state *crtc_state)
{
@@ -649,6 +714,8 @@ void intel_color_init(struct intel_crtc *crtc)
} else if (IS_GEMINILAKE(dev_priv) || IS_CANNONLAKE(dev_priv)) {
dev_priv->display.load_csc_matrix = ilk_load_csc_matrix;
dev_priv->display.load_luts = glk_load_luts;
+ } else if (IS_ICELAKE(dev_priv)) {
+ dev_priv->display.load_luts = icl_load_luts;
} else {
dev_priv->display.load_luts = i9xx_load_luts;
}
--
1.9.1
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