[v4 2/5] drm/i915/display: Compute the scaler filter coefficients
Nemesa Garg
nemesa.garg at intel.com
Mon Jul 8 08:09:14 UTC 2024
The sharpness property requires the use of one of the scaler
so need to set the sharpness scaler coefficient values.
These values are based on experiments and vary for different
tap value/win size. These values are normalized by taking the
sum of all values and then dividing each value with a sum.
--v4: fix ifndef header naming issue reported by kernel test robot
Signed-off-by: Nemesa Garg <nemesa.garg at intel.com>
---
drivers/gpu/drm/i915/Makefile | 1 +
drivers/gpu/drm/i915/display/intel_display.c | 2 +
.../drm/i915/display/intel_display_types.h | 9 ++
.../drm/i915/display/intel_sharpen_filter.c | 121 ++++++++++++++++++
.../drm/i915/display/intel_sharpen_filter.h | 27 ++++
drivers/gpu/drm/i915/i915_reg.h | 2 +
drivers/gpu/drm/xe/Makefile | 1 +
7 files changed, 163 insertions(+)
create mode 100644 drivers/gpu/drm/i915/display/intel_sharpen_filter.c
create mode 100644 drivers/gpu/drm/i915/display/intel_sharpen_filter.h
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index c63fa2133ccb..0021f0a372ab 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -280,6 +280,7 @@ i915-y += \
display/intel_pmdemand.o \
display/intel_psr.o \
display/intel_quirks.o \
+ display/intel_sharpen_filter.o \
display/intel_sprite.o \
display/intel_sprite_uapi.o \
display/intel_tc.o \
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index c2c388212e2e..a62560a0c1a9 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -5906,6 +5906,8 @@ static int intel_atomic_check_planes(struct intel_atomic_state *state)
if (ret)
return ret;
+ intel_sharpness_scaler_compute_config(new_crtc_state);
+
/*
* On some platforms the number of active planes affects
* the planes' minimum cdclk calculation. Add such planes
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 8713835e2307..1c3e031ab369 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -55,6 +55,7 @@
#include "intel_display_limits.h"
#include "intel_display_power.h"
#include "intel_dpll_mgr.h"
+#include "intel_sharpen_filter.h"
#include "intel_wm_types.h"
struct drm_printer;
@@ -828,6 +829,13 @@ struct intel_scaler {
u32 mode;
};
+struct intel_sharpness_filter {
+ struct scaler_filter_coeff coeff[7];
+ u32 scaler_coefficient[119];
+ bool strength_changed;
+ u8 win_size;
+};
+
struct intel_crtc_scaler_state {
#define SKL_NUM_SCALERS 2
struct intel_scaler scalers[SKL_NUM_SCALERS];
@@ -1072,6 +1080,7 @@ struct intel_crtc_state {
struct drm_property_blob *degamma_lut, *gamma_lut, *ctm;
struct drm_display_mode mode, pipe_mode, adjusted_mode;
enum drm_scaling_filter scaling_filter;
+ struct intel_sharpness_filter casf_params;
} hw;
/* actual state of LUTs */
diff --git a/drivers/gpu/drm/i915/display/intel_sharpen_filter.c b/drivers/gpu/drm/i915/display/intel_sharpen_filter.c
new file mode 100644
index 000000000000..b3ebd72b4116
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_sharpen_filter.c
@@ -0,0 +1,121 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2024 Intel Corporation
+ *
+ */
+
+#include "i915_reg.h"
+#include "intel_de.h"
+#include "intel_display_types.h"
+#include "skl_scaler.h"
+
+#define MAX_NUM_UNIQUE_COEF_FOR_SHARPNESS_FILTER 7
+#define SCALER_FILTER_NUM_TAPS 7
+#define SCALER_FILTER_NUM_PHASES 17
+#define FILTER_COEFF_0_125 125
+#define FILTER_COEFF_0_25 250
+#define FILTER_COEFF_0_5 500
+#define FILTER_COEFF_1_0 1000
+#define FILTER_COEFF_0_0 0
+
+void intel_sharpness_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;
+
+ intel_de_write_fw(dev_priv, GLK_PS_COEF_INDEX_SET(crtc->pipe, id, 0),
+ PS_COEF_INDEX_AUTO_INC);
+
+ intel_de_write_fw(dev_priv, GLK_PS_COEF_INDEX_SET(crtc->pipe, id, 1),
+ PS_COEF_INDEX_AUTO_INC);
+
+ for (int index = 0; index < 60; index++) {
+ intel_de_write_fw(dev_priv, GLK_PS_COEF_DATA_SET(crtc->pipe, id, 0),
+ crtc_state->hw.casf_params.scaler_coefficient[index]);
+ intel_de_write_fw(dev_priv, GLK_PS_COEF_DATA_SET(crtc->pipe, id, 1),
+ crtc_state->hw.casf_params. scaler_coefficient[index]);
+ }
+}
+
+static void convert_sharpness_coef_binary(struct scaler_filter_coeff *coeff,
+ u16 coefficient)
+{
+ if (coefficient < 25) {
+ coeff->mantissa = (coefficient * 2048) / 100;
+ coeff->exp = 3;
+ }
+
+ else if (coefficient < 50) {
+ coeff->mantissa = (coefficient * 1024) / 100;
+ coeff->exp = 2;
+ }
+
+ else if (coefficient < 100) {
+ coeff->mantissa = (coefficient * 512) / 100;
+ coeff->exp = 1;
+ } else {
+ coeff->mantissa = (coefficient * 256) / 100;
+ coeff->exp = 0;
+ }
+}
+
+static void intel_sharpness_filter_coeff(struct intel_crtc_state *crtc_state)
+{
+ u16 filtercoeff[MAX_NUM_UNIQUE_COEF_FOR_SHARPNESS_FILTER];
+ u16 sumcoeff = 0;
+ u8 i;
+
+ if (crtc_state->hw.casf_params.win_size == 0) {
+ filtercoeff[0] = FILTER_COEFF_0_0;
+ filtercoeff[1] = FILTER_COEFF_0_0;
+ filtercoeff[2] = FILTER_COEFF_0_5;
+ filtercoeff[3] = FILTER_COEFF_1_0;
+ filtercoeff[4] = FILTER_COEFF_0_5;
+ filtercoeff[5] = FILTER_COEFF_0_0;
+ filtercoeff[6] = FILTER_COEFF_0_0;
+ }
+
+ else if (crtc_state->hw.casf_params.win_size == 1) {
+ filtercoeff[0] = FILTER_COEFF_0_0;
+ filtercoeff[1] = FILTER_COEFF_0_25;
+ filtercoeff[2] = FILTER_COEFF_0_5;
+ filtercoeff[3] = FILTER_COEFF_1_0;
+ filtercoeff[4] = FILTER_COEFF_0_5;
+ filtercoeff[5] = FILTER_COEFF_0_25;
+ filtercoeff[6] = FILTER_COEFF_0_0;
+ } else {
+ filtercoeff[0] = FILTER_COEFF_0_125;
+ filtercoeff[1] = FILTER_COEFF_0_25;
+ filtercoeff[2] = FILTER_COEFF_0_5;
+ filtercoeff[3] = FILTER_COEFF_1_0;
+ filtercoeff[4] = FILTER_COEFF_0_5;
+ filtercoeff[5] = FILTER_COEFF_0_25;
+ filtercoeff[6] = FILTER_COEFF_0_125;
+ }
+
+ for (i = 0; i < MAX_NUM_UNIQUE_COEF_FOR_SHARPNESS_FILTER; i++)
+ sumcoeff += filtercoeff[i];
+
+ for (i = 0; i < MAX_NUM_UNIQUE_COEF_FOR_SHARPNESS_FILTER; i++) {
+ filtercoeff[i] = (filtercoeff[i] * 100 / sumcoeff);
+ convert_sharpness_coef_binary(&crtc_state->hw.casf_params.coeff[i],
+ filtercoeff[i]);
+ }
+}
+
+void intel_sharpness_scaler_compute_config(struct intel_crtc_state *crtc_state)
+{
+ u16 phase, tapindex, phaseoffset;
+ u16 *coeff = (u16 *)crtc_state->hw.casf_params.scaler_coefficient;
+
+ intel_sharpness_filter_coeff(crtc_state);
+
+ for (phase = 0; phase < SCALER_FILTER_NUM_PHASES; phase++) {
+ phaseoffset = SCALER_FILTER_NUM_TAPS * phase;
+ for (tapindex = 0; tapindex < SCALER_FILTER_NUM_TAPS; tapindex++) {
+ coeff[phaseoffset + tapindex] =
+ SHARP_COEFF_TO_REG_FORMAT(crtc_state->hw.casf_params.coeff[tapindex]);
+ }
+ }
+}
diff --git a/drivers/gpu/drm/i915/display/intel_sharpen_filter.h b/drivers/gpu/drm/i915/display/intel_sharpen_filter.h
new file mode 100644
index 000000000000..6ab70a635e2f
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_sharpen_filter.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2024 Intel Corporation
+ */
+
+#ifndef __INTEL_SHARPEN_FILTER_H__
+#define __INTEL_SHARPEN_FILTER_H__
+
+#include <linux/types.h>
+
+#define SHARP_COEFF_TO_REG_FORMAT(coefficient) ((u16)(coefficient.sign << 15 | \
+ coefficient.exp << 12 | coefficient.mantissa << 3))
+
+struct intel_crtc;
+struct intel_crtc_state;
+struct intel_atomic_state;
+
+struct scaler_filter_coeff {
+ u16 sign;
+ u16 exp;
+ u16 mantissa;
+};
+
+void intel_sharpness_filter_enable(struct intel_crtc_state *crtc_state);
+void intel_sharpness_scaler_compute_config(struct intel_crtc_state *crtc_state);
+
+#endif /* __INTEL_SHARPEN_FILTER_H__ */
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 0e3d79227e3c..9492fda15627 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2257,6 +2257,8 @@
#define PS_VERT_INT_INVERT_FIELD REG_BIT(20)
#define PS_PROG_SCALE_FACTOR REG_BIT(19) /* tgl+ */
#define PS_PWRUP_PROGRESS REG_BIT(17)
+#define PS_BYPASS_ARMING REG_BIT(10)
+#define PS_DB_STALL REG_BIT(9)
#define PS_V_FILTER_BYPASS REG_BIT(8)
#define PS_VADAPT_EN REG_BIT(7) /* skl/bxt */
#define PS_VADAPT_MODE_MASK REG_GENMASK(6, 5) /* skl/bxt */
diff --git a/drivers/gpu/drm/xe/Makefile b/drivers/gpu/drm/xe/Makefile
index 0eb0acc4f198..8681ca89af27 100644
--- a/drivers/gpu/drm/xe/Makefile
+++ b/drivers/gpu/drm/xe/Makefile
@@ -278,6 +278,7 @@ xe-$(CONFIG_DRM_XE_DISPLAY) += \
i915-display/intel_psr.o \
i915-display/intel_qp_tables.o \
i915-display/intel_quirks.o \
+ i915-display/intel_sharpen_filter.o \
i915-display/intel_snps_phy.o \
i915-display/intel_tc.o \
i915-display/intel_vblank.o \
--
2.25.1
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