[RFC 4/5] drm/i915/display/: Add registers and compute the strength

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Add new registers and related bits. Compute the strength
value and tap value based on display mode.

Signed-off-by: Nemesa Garg <nemesa.garg@xxxxxxxxx>
---
 .../drm/i915/display/intel_display_types.h    |  1 +
 .../drm/i915/display/intel_sharpen_filter.c   | 84 +++++++++++++++++++
 .../drm/i915/display/intel_sharpen_filter.h   |  4 +
 drivers/gpu/drm/i915/i915_reg.h               | 17 ++++
 4 files changed, 106 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index d43931127ec2..ff1facc1c2c6 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -801,6 +801,7 @@ struct intel_sharpen_filter {
 	bool strength_changed;
 	u8 win_size;
 	bool need_scaler;
+	u8 strength;
 };
 
 struct intel_crtc_scaler_state {
diff --git a/drivers/gpu/drm/i915/display/intel_sharpen_filter.c b/drivers/gpu/drm/i915/display/intel_sharpen_filter.c
index 221dca3bcba5..285e341acc94 100644
--- a/drivers/gpu/drm/i915/display/intel_sharpen_filter.c
+++ b/drivers/gpu/drm/i915/display/intel_sharpen_filter.c
@@ -18,11 +18,83 @@
 #define filter_coeff_1_0 1000
 #define filter_coeff_0_0 0
 
+/*
+ * Default LUT values to be loaded one time.
+ */
+static const u16 lut_data[] = {
+	4095, 2047, 1364, 1022, 816, 678, 579,
+	504, 444, 397, 357, 323, 293, 268, 244, 224,
+	204, 187, 170, 154, 139, 125, 111, 98, 85,
+	73, 60, 48, 36, 24, 12, 0
+};
+
+void intel_filter_lut_load(struct intel_crtc *crtc,
+			   const struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+	int i;
+
+	intel_de_write(dev_priv, SHRPLUT_INDEX(crtc->pipe), INDEX_AUTO_INCR | INDEX_VALUE(0));
+
+	for (i = 0; i < ARRAY_SIZE(lut_data); i++)
+		intel_de_write(dev_priv, SHRPLUT_DATA(crtc->pipe), lut_data[i]);
+}
+
+/*
+ * HW takes a value in form (1.0 + strength) in 4.4 fixed format.
+ * Strength is from 0.0-14.9375 ie from 0-239.
+ * User can give value from 0-255 but is clamped to 239.
+ * Ex. User gives 85 which is 5.3125 and adding 1.0 gives 6.3125.
+ * 6.3125 in 4.4 format is 01100101 which is equal to 101.
+ * Also 85 + 16 = 101.
+ */
+static void intel_filter_strength_compute(struct intel_crtc_state *crtc_state, u8 *val)
+{
+	*val = min(crtc_state->hw.casf_params.strength, 0xEF) + 0x10;
+}
+
+static void intel_filter_size_compute(struct intel_crtc_state *crtc_state)
+{
+	const struct drm_display_mode *mode = &crtc_state->hw.adjusted_mode;
+
+	if (mode->hdisplay <= 1920 && mode->vdisplay <= 1080)
+		crtc_state->hw.casf_params.win_size = 0;
+	else if (mode->hdisplay <= 3840 && mode->vdisplay <= 2160)
+		crtc_state->hw.casf_params.win_size = 1;
+	else
+		crtc_state->hw.casf_params.win_size = 2;
+}
+
+void intel_sharpen_strength_changed(struct intel_atomic_state *state)
+{
+	int i;
+	struct intel_crtc_state *old_crtc_state, *new_crtc_state;
+	struct intel_crtc *crtc;
+
+	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
+					    new_crtc_state, i) {
+		if (new_crtc_state->uapi.sharpeness_strength !=
+				old_crtc_state->uapi.sharpeness_strength)
+			new_crtc_state->hw.casf_params.strength_changed = true;
+	}
+}
+
 void intel_sharpen_filter_enable(struct intel_crtc_state *crtc_state)
 {
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
 	int id = crtc_state->scaler_state.scaler_id;
+	u32 sharpness_ctl;
+	u8 val;
+
+	intel_filter_strength_compute(crtc_state, &val);
+	drm_dbg(&dev_priv->drm, "Filter strength value: %d\n", val);
+
+	sharpness_ctl =	FILTER_EN | FILTER_STRENGTH(val) |
+		FILTER_SIZE(crtc_state->hw.casf_params.win_size);
+
+	intel_de_write(dev_priv, SHARPNESS_CTL(crtc->pipe),
+		       sharpness_ctl);
 
 	intel_de_write_fw(dev_priv, GLK_PS_COEF_INDEX_SET(crtc->pipe, id, 0),
 			  PS_COEF_INDEX_AUTO_INC);
@@ -42,7 +114,19 @@ void intel_sharpen_filter_enable(struct intel_crtc_state *crtc_state)
 
 int intel_filter_compute_config(struct intel_crtc_state *crtc_state)
 {
+	struct intel_crtc *intel_crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
+
+	if (crtc_state->uapi.sharpeness_strength == 0)
+		return -EINVAL;
+
+	crtc_state->hw.casf_params.strength =
+		crtc_state->uapi.sharpeness_strength;
 	crtc_state->hw.casf_params.need_scaler = true;
+	
+	intel_filter_size_compute(crtc_state);
+	drm_dbg(&dev_priv->drm, "Tap Size: %d\n",
+		crtc_state->hw.casf_params.win_size);
 
 	return 0;
 }
diff --git a/drivers/gpu/drm/i915/display/intel_sharpen_filter.h b/drivers/gpu/drm/i915/display/intel_sharpen_filter.h
index 89c0d689469c..3100ef696448 100644
--- a/drivers/gpu/drm/i915/display/intel_sharpen_filter.h
+++ b/drivers/gpu/drm/i915/display/intel_sharpen_filter.h
@@ -24,4 +24,8 @@ struct scaler_filter_coeff {
 void intel_sharpen_filter_enable(struct intel_crtc_state *crtc_state);
 void intel_sharpness_scaler_compute_config(struct intel_crtc_state *crtc_state);
 int intel_filter_compute_config(struct intel_crtc_state *crtc_state);
+void intel_filter_lut_load(struct intel_crtc *crtc,
+			   const struct intel_crtc_state *crtc_state);
+void intel_sharpen_strength_changed(struct intel_atomic_state *state);
+
 #endif /* __INTEL_SHARPEN_FLITER_H__ */
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 9d759026add4..a49d946c4479 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4211,6 +4211,23 @@
 			_ID(id, _PS_COEF_SET0_DATA_1A, _PS_COEF_SET0_DATA_2A) + (set) * 8, \
 			_ID(id, _PS_COEF_SET0_DATA_1B, _PS_COEF_SET0_DATA_2B) + (set) * 8)
 
+#define _SHARPNESS_CTL_A               0x682B0
+#define SHARPNESS_CTL(trans)           _MMIO_PIPE2(trans, _SHARPNESS_CTL_A)
+#define  FILTER_EN                      REG_BIT(31)
+#define  FILTER_STRENGTH_MASK           REG_GENMASK(15, 8)
+#define  FILTER_STRENGTH(x)             REG_FIELD_PREP(FILTER_STRENGTH_MASK, (x))
+#define  FILTER_SIZE_MASK               REG_GENMASK(1, 0)
+#define  FILTER_SIZE(x)                 REG_FIELD_PREP(FILTER_SIZE_MASK, (x))
+
+#define _SHRPLUT_DATA_A			0x682B8
+#define SHRPLUT_DATA(trans)		_MMIO_PIPE2(trans, _SHRPLUT_DATA_A)
+
+#define _SHRPLUT_INDEX_A		0x682B4
+#define SHRPLUT_INDEX(trans)		_MMIO_PIPE2(trans, _SHRPLUT_INDEX_A)
+#define  INDEX_AUTO_INCR		REG_BIT(10)
+#define  INDEX_VALUE_MASK		REG_GENMASK(4, 0)
+#define  INDEX_VALUE(x)			REG_FIELD_PREP(INDEX_VALUE_MASK, (x))
+
 /* Display Internal Timeout Register */
 #define RM_TIMEOUT		_MMIO(0x42060)
 #define  MMIO_TIMEOUT_US(us)	((us) << 0)
-- 
2.25.1




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