[PATCH 2/5] drm/i915/display: Compute the scaler filter coefficients
Nemesa Garg
nemesa.garg at intel.com
Thu Nov 14 10:18:22 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.
v2: Fix ifndef header naming issue reported by kernel test robot
v3: Rename file name[Arun]
Replace array size number with macro[Arun]
v4: Correct the register format[Jani]
Add brief comment and expalin about file[Jani]
Remove coefficient value from crtc_state[Jani]
v5: Fix build issue
Signed-off-by: Nemesa Garg <nemesa.garg at intel.com>
Reviewed-by: Naga Venkata Srikanth V <nagavenkata.srikanth.v at intel.com>
---
drivers/gpu/drm/i915/Makefile | 1 +
drivers/gpu/drm/i915/display/intel_casf.c | 128 ++++++++++++++++++
drivers/gpu/drm/i915/display/intel_casf.h | 16 +++
.../gpu/drm/i915/display/intel_casf_regs.h | 19 +++
drivers/gpu/drm/i915/display/intel_display.c | 3 +
.../drm/i915/display/intel_display_types.h | 14 ++
drivers/gpu/drm/i915/i915_reg.h | 2 +
drivers/gpu/drm/xe/Makefile | 1 +
8 files changed, 184 insertions(+)
create mode 100644 drivers/gpu/drm/i915/display/intel_casf.c
create mode 100644 drivers/gpu/drm/i915/display/intel_casf.h
create mode 100644 drivers/gpu/drm/i915/display/intel_casf_regs.h
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 31710d98cad5..b3ca13df8c58 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -283,6 +283,7 @@ i915-y += \
display/intel_pmdemand.o \
display/intel_psr.o \
display/intel_quirks.o \
+ display/intel_casf.o \
display/intel_sprite.o \
display/intel_sprite_uapi.o \
display/intel_tc.o \
diff --git a/drivers/gpu/drm/i915/display/intel_casf.c b/drivers/gpu/drm/i915/display/intel_casf.c
new file mode 100644
index 000000000000..d186dea75cbf
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_casf.c
@@ -0,0 +1,128 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2024 Intel Corporation
+ *
+ */
+#include "i915_reg.h"
+#include "intel_de.h"
+#include "intel_display_types.h"
+#include "intel_casf.h"
+#include "intel_casf_regs.h"
+#include "skl_scaler.h"
+
+#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
+#define SET_POSITIVE_SIGN(x) ((x) & (~SIGN))
+
+/**
+ * DOC: Content Adaptive Sharpness Filter (CASF)
+ *
+ * From LNL onwards the display engine based adaptive
+ * sharpening filter is supported. This helps in
+ * improving the image quality. The display hardware
+ * uses one of the pipe scaler for implementing casf.
+ * It works on a region of pixels depending on the
+ * tap size. The coefficients are used to generate an
+ * alpha value which is used to blend the sharpened image
+ * to original image.
+ */
+
+const u16 filtercoeff_1[] = {FILTER_COEFF_0_0, FILTER_COEFF_0_0,
+FILTER_COEFF_0_5, FILTER_COEFF_1_0, FILTER_COEFF_0_5, FILTER_COEFF_0_0, FILTER_COEFF_0_0};
+
+const u16 filtercoeff_2[] = {FILTER_COEFF_0_0, FILTER_COEFF_0_25,
+FILTER_COEFF_0_5, FILTER_COEFF_1_0, FILTER_COEFF_0_5, FILTER_COEFF_0_25, FILTER_COEFF_0_0};
+
+const u16 filtercoeff_3[] = {FILTER_COEFF_0_125, FILTER_COEFF_0_25,
+FILTER_COEFF_0_5, FILTER_COEFF_1_0, FILTER_COEFF_0_5, FILTER_COEFF_0_25, FILTER_COEFF_0_125};
+
+static int casf_coef_tap(int i)
+{
+ return i % 7;
+}
+
+static u16 casf_coef(struct intel_crtc_state *crtc_state, int t)
+{
+ struct scaler_filter_coeff value;
+ u16 coeff;
+
+ value = crtc_state->hw.casf_params.coeff[t];
+ coeff = SET_POSITIVE_SIGN(0) | EXPONENT(value.exp) | MANTISSA(value.mantissa);
+
+ return coeff;
+}
+
+void intel_casf_enable(struct intel_crtc_state *crtc_state)
+{
+ struct intel_display *display = to_intel_display(crtc_state);
+ struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+ int id = crtc_state->scaler_state.scaler_id;
+ int i;
+
+ intel_de_write_fw(display, GLK_PS_COEF_INDEX_SET(crtc->pipe, id, 0),
+ PS_COEF_INDEX_AUTO_INC);
+
+ intel_de_write_fw(display, GLK_PS_COEF_INDEX_SET(crtc->pipe, id, 1),
+ PS_COEF_INDEX_AUTO_INC);
+
+ for (i = 0; i < 17 * 7; i += 2) {
+ u32 tmp;
+ int t;
+
+ t = casf_coef_tap(i);
+ tmp = casf_coef(crtc_state, t);
+
+ t = casf_coef_tap(i + 1);
+ tmp |= casf_coef(crtc_state, t) << 16;
+
+ intel_de_write_fw(display, GLK_PS_COEF_DATA_SET(crtc->pipe, id, 0),
+ tmp);
+ intel_de_write_fw(display, GLK_PS_COEF_DATA_SET(crtc->pipe, id, 1),
+ tmp);
+ }
+}
+
+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;
+ }
+}
+
+void intel_casf_scaler_compute_config(struct intel_crtc_state *crtc_state)
+{
+ const u16 *filtercoeff;
+ u16 filter_coeff[SCALER_FILTER_NUM_TAPS];
+ u16 sumcoeff = 0;
+ u8 i;
+
+ if (crtc_state->hw.casf_params.win_size == 0)
+ filtercoeff = filtercoeff_1;
+ else if (crtc_state->hw.casf_params.win_size == 1)
+ filtercoeff = filtercoeff_2;
+ else
+ filtercoeff = filtercoeff_3;
+
+ for (i = 0; i < SCALER_FILTER_NUM_TAPS; i++)
+ sumcoeff += *(filtercoeff + i);
+
+ for (i = 0; i < SCALER_FILTER_NUM_TAPS; i++) {
+ filter_coeff[i] = (*(filtercoeff + i) * 100 / sumcoeff);
+ convert_sharpness_coef_binary(&crtc_state->hw.casf_params.coeff[i],
+ filter_coeff[i]);
+ }
+}
diff --git a/drivers/gpu/drm/i915/display/intel_casf.h b/drivers/gpu/drm/i915/display/intel_casf.h
new file mode 100644
index 000000000000..8e0b67a2fd99
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_casf.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2024 Intel Corporation
+ */
+
+#ifndef __INTEL_CASF_H__
+#define __INTEL_CASF_H__
+
+#include <linux/types.h>
+
+struct intel_crtc_state;
+
+void intel_casf_enable(struct intel_crtc_state *crtc_state);
+void intel_casf_scaler_compute_config(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
new file mode 100644
index 000000000000..0b3fcdb22c0c
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_casf_regs.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2024 Intel Corporation
+ */
+
+#ifndef __INTEL_CASF_REGS_H__
+#define __INTEL_CASF_REGS_H__
+
+#include "intel_display_reg_defs.h"
+
+/* Scaler Coefficient structure */
+#define SIGN REG_BIT(15)
+#define EXPONENT_MASK REG_GENMASK(13, 12)
+#define EXPONENT(x) REG_FIELD_PREP(EXPONENT_MASK, (x))
+#define MANTISSA_MASK REG_GENMASK(11, 3)
+#define MANTISSA(x) REG_FIELD_PREP(MANTISSA_MASK, (x))
+
+#endif /* __INTEL_CASF_REGS__ */
+
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index e790a2de5b3d..86d5f916dfe1 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -111,6 +111,7 @@
#include "intel_psr.h"
#include "intel_psr_regs.h"
#include "intel_sdvo.h"
+#include "intel_casf.h"
#include "intel_snps_phy.h"
#include "intel_tc.h"
#include "intel_tdf.h"
@@ -6193,6 +6194,8 @@ static int intel_atomic_check_planes(struct intel_atomic_state *state)
if (ret)
return ret;
+ intel_casf_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 339e4b0f7698..19a671848f42 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -909,6 +909,19 @@ struct intel_csc_matrix {
u16 postoff[3];
};
+struct scaler_filter_coeff {
+ u16 sign;
+ u16 exp;
+ u16 mantissa;
+};
+
+struct intel_casf {
+#define SCALER_FILTER_NUM_TAPS 7
+ struct scaler_filter_coeff coeff[SCALER_FILTER_NUM_TAPS];
+ u8 win_size;
+ bool need_scaler;
+};
+
void intel_io_mmio_fw_write(void *ctx, i915_reg_t reg, u32 val);
typedef void (*intel_io_reg_write)(void *ctx, i915_reg_t reg, u32 val);
@@ -949,6 +962,7 @@ 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_casf casf_params;
} hw;
/* actual state of LUTs */
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 7a35be56b7ef..2458bad38e74 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2203,6 +2203,8 @@
#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 a93e6fcc0ad9..fbc45a66b429 100644
--- a/drivers/gpu/drm/xe/Makefile
+++ b/drivers/gpu/drm/xe/Makefile
@@ -260,6 +260,7 @@ xe-$(CONFIG_DRM_XE_DISPLAY) += \
i915-display/intel_psr.o \
i915-display/intel_qp_tables.o \
i915-display/intel_quirks.o \
+ i915-display/intel_casf.o \
i915-display/intel_snps_phy.o \
i915-display/intel_tc.o \
i915-display/intel_vblank.o \
--
2.25.1
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