[PATCH 04/10] drm/i915/display: Add filter lut values

[Nemesa Garg]

Add the register bits related to filter lut values
and populate the table.

Signed-off-by: Nemesa Garg <nemesa.garg at intel.com>
---
 drivers/gpu/drm/i915/display/intel_casf.c     | 22 +++++++++++++++++++
 drivers/gpu/drm/i915/display/intel_casf.h     |  3 +++
 .../gpu/drm/i915/display/intel_casf_regs.h    | 11 ++++++++++
 3 files changed, 36 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_casf.c b/drivers/gpu/drm/i915/display/intel_casf.c
index 2c406e7c5fb6..ed72bccbb93f 100644
--- a/drivers/gpu/drm/i915/display/intel_casf.c
+++ b/drivers/gpu/drm/i915/display/intel_casf.c
@@ -25,6 +25,28 @@
  * to original image.
  */
 
+/* Default LUT values to be loaded one time. */
+static const u16 sharpness_lut[] = {
+	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 intel_display *display = to_intel_display(crtc_state);
+	int i;
+
+	intel_de_write(display, SHRPLUT_INDEX(crtc->pipe),
+		       INDEX_AUTO_INCR | INDEX_VALUE(0));
+
+	for (i = 0; i < ARRAY_SIZE(sharpness_lut); i++)
+		intel_de_write(display, SHRPLUT_DATA(crtc->pipe),
+			       sharpness_lut[i]);
+}
+
 void intel_casf_update_strength(struct intel_crtc_state *crtc_state)
 {
 	struct intel_display *display = to_intel_display(crtc_state);
diff --git a/drivers/gpu/drm/i915/display/intel_casf.h b/drivers/gpu/drm/i915/display/intel_casf.h
index 6e308c367c17..faeed50de2ba 100644
--- a/drivers/gpu/drm/i915/display/intel_casf.h
+++ b/drivers/gpu/drm/i915/display/intel_casf.h
@@ -9,8 +9,11 @@
 #include <linux/types.h>
 
 struct intel_crtc_state;
+struct intel_crtc;
 
 int intel_casf_compute_config(struct intel_crtc_state *crtc_state);
 void intel_casf_update_strength(struct intel_crtc_state *new_crtc_state);
+void intel_filter_lut_load(struct intel_crtc *crtc,
+			   const struct intel_crtc_state *crtc_state);
 
 #endif /* __INTEL_CASF_H__ */
diff --git a/drivers/gpu/drm/i915/display/intel_casf_regs.h b/drivers/gpu/drm/i915/display/intel_casf_regs.h
index e5fa4d9bb309..c61755a401ff 100644
--- a/drivers/gpu/drm/i915/display/intel_casf_regs.h
+++ b/drivers/gpu/drm/i915/display/intel_casf_regs.h
@@ -19,5 +19,16 @@
 #define   SHARPNESS_FILTER_SIZE_5X5    REG_FIELD_PREP(FILTER_SIZE_MASK, 1)
 #define   SHARPNESS_FILTER_SIZE_7X7    REG_FIELD_PREP(FILTER_SIZE_MASK, 2)
 
+#define _SHRPLUT_DATA_A                        0x682B8
+#define _SHRPLUT_DATA_B                        0x68AB8
+#define SHRPLUT_DATA(pipe)             _MMIO_PIPE(pipe, _SHRPLUT_DATA_A, _SHRPLUT_DATA_B)
+
+#define _SHRPLUT_INDEX_A               0x682B4
+#define _SHRPLUT_INDEX_B               0x68AB4
+#define SHRPLUT_INDEX(pipe)            _MMIO_PIPE(pipe, _SHRPLUT_INDEX_A, _SHRPLUT_INDEX_B)
+#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))
+
 #endif /* __INTEL_CASF_REGS__ */
 
-- 
2.25.1