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>
---
drivers/gpu/drm/i915/Makefile | 1 +
drivers/gpu/drm/i915/display/intel_casf.c | 68 +++++++++++++++++++
drivers/gpu/drm/i915/display/intel_casf.h | 16 +++++
.../gpu/drm/i915/display/intel_casf_regs.h | 23 +++++++
.../drm/i915/display/intel_crtc_state_dump.c | 7 ++
.../drm/i915/display/intel_display_types.h | 7 ++
drivers/gpu/drm/i915/display/skl_scaler.c | 1 +
drivers/gpu/drm/xe/Makefile | 1 +
8 files changed, 124 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 ed05b131ed3a..d7550b26cdfb 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -230,6 +230,7 @@ i915-y += \
display/intel_bios.o \
display/intel_bo.o \
display/intel_bw.o \
+ display/intel_casf.o \
display/intel_cdclk.o \
display/intel_cmtg.o \
display/intel_color.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..2c406e7c5fb6
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_casf.c
@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2025 Intel Corporation
+ *
+ */
+#include "i915_reg.h"
+#include "intel_casf.h"
+#include "intel_casf_regs.h"
+#include "intel_de.h"
+#include "intel_display_types.h"
+
+#define MAX_PIXELS_FOR_3_TAP_FILTER (1920 * 1080)
+#define MAX_PIXELS_FOR_5_TAP_FILTER (3840 * 2160)
+
+/**
+ * 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.
+ */
+
+void intel_casf_update_strength(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);
+
+ intel_de_rmw(display, SHARPNESS_CTL(crtc->pipe), 0,
+ FILTER_STRENGTH(crtc_state->hw.casf_params.strength));
+}
+
+static void intel_casf_compute_win_size(struct intel_crtc_state *crtc_state)
+{
+ const struct drm_display_mode *mode = &crtc_state->hw.adjusted_mode;
+ u16 total_pixels = mode->hdisplay * mode->vdisplay;
+
+ if (total_pixels <= MAX_PIXELS_FOR_3_TAP_FILTER)
+ crtc_state->hw.casf_params.win_size = SHARPNESS_FILTER_SIZE_3X3;
+ else if (total_pixels <= MAX_PIXELS_FOR_5_TAP_FILTER)
+ crtc_state->hw.casf_params.win_size = SHARPNESS_FILTER_SIZE_5X5;
+ else
+ crtc_state->hw.casf_params.win_size = SHARPNESS_FILTER_SIZE_7X7;
+}
+
+int intel_casf_compute_config(struct intel_crtc_state *crtc_state)
+{
+ crtc_state->hw.casf_params.casf_enable = true;
+
+ /*
+ * 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 b01100101 which is equal to 101.
+ * Also 85 + 16 = 101.
+ */
+ crtc_state->hw.casf_params.strength =
+ min(crtc_state->uapi.sharpness_strength, 0xEF) + 0x10;
+
+ intel_casf_compute_win_size(crtc_state);
+
+ return 0;
+}
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..6e308c367c17
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_casf.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2025 Intel Corporation
+ */
+
+#ifndef __INTEL_CASF_H__
+#define __INTEL_CASF_H__
+
+#include <linux/types.h>
+
+struct intel_crtc_state;
+
+int intel_casf_compute_config(struct intel_crtc_state *crtc_state);
+void intel_casf_update_strength(struct intel_crtc_state *new_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..e5fa4d9bb309
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_casf_regs.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2025 Intel Corporation
+ */
+
+#ifndef __INTEL_CASF_REGS_H__
+#define __INTEL_CASF_REGS_H__
+
+#include "intel_display_reg_defs.h"
+
+#define _SHARPNESS_CTL_A 0x682B0
+#define _SHARPNESS_CTL_B 0x68AB0
+#define SHARPNESS_CTL(pipe) _MMIO_PIPE(pipe, _SHARPNESS_CTL_A, _SHARPNESS_CTL_B)
+#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 SHARPNESS_FILTER_SIZE_3X3 REG_FIELD_PREP(FILTER_SIZE_MASK, 0)
+#define SHARPNESS_FILTER_SIZE_5X5 REG_FIELD_PREP(FILTER_SIZE_MASK, 1)
+#define SHARPNESS_FILTER_SIZE_7X7 REG_FIELD_PREP(FILTER_SIZE_MASK, 2)
+
+#endif /* __INTEL_CASF_REGS__ */
+
diff --git a/drivers/gpu/drm/i915/display/intel_crtc_state_dump.c b/drivers/gpu/drm/i915/display/intel_crtc_state_dump.c
index 599ddce96371..66b6fbae8294 100644
--- a/drivers/gpu/drm/i915/display/intel_crtc_state_dump.c
+++ b/drivers/gpu/drm/i915/display/intel_crtc_state_dump.c
@@ -372,6 +372,13 @@ void intel_crtc_state_dump(const struct intel_crtc_state *pipe_config,
intel_vdsc_state_dump(&p, 0, pipe_config);
+ if (HAS_CASF(i915)) {
+ drm_printf(&p, "sharpness strength: %d, sharpness tap size :%d\n sharpness enable :%d\n",
+ pipe_config->hw.casf_params.strength,
+ pipe_config->hw.casf_params.win_size,
+ pipe_config->hw.casf_params.casf_enable);
+ }
+
dump_planes:
if (!state)
return;
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 99a6fd2900b9..ccaf9dd4f6a8 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -931,6 +931,12 @@ struct intel_csc_matrix {
u16 postoff[3];
};
+struct intel_casf {
+ u8 strength;
+ u8 win_size;
+ bool casf_enable;
+};
+
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);
@@ -971,6 +977,7 @@ 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/display/skl_scaler.c b/drivers/gpu/drm/i915/display/skl_scaler.c
index ee81220a7c88..f0cf966211c9 100644
--- a/drivers/gpu/drm/i915/display/skl_scaler.c
+++ b/drivers/gpu/drm/i915/display/skl_scaler.c
@@ -5,6 +5,7 @@
#include "i915_drv.h"
#include "i915_reg.h"
+#include "intel_casf_regs.h"
#include "intel_de.h"
#include "intel_display_trace.h"
#include "intel_display_types.h"
diff --git a/drivers/gpu/drm/xe/Makefile b/drivers/gpu/drm/xe/Makefile
index 856b14fe1c4d..a6156f59c039 100644
--- a/drivers/gpu/drm/xe/Makefile
+++ b/drivers/gpu/drm/xe/Makefile
@@ -207,6 +207,7 @@ xe-$(CONFIG_DRM_XE_DISPLAY) += \
i915-display/intel_backlight.o \
i915-display/intel_bios.o \
i915-display/intel_bw.o \
+ i915-display/intel_casf.o \
i915-display/intel_cdclk.o \
i915-display/intel_cmtg.o \
i915-display/intel_color.o \
--
2.25.1
