API are added to enable/disable histogram. Upon generation of histogram
interrupt its notified to the usespace. User can then use this histogram
and generate a LUT which is then fed back to the enahancement block.
Histogram is an image statistics based on the input pixel stream.
LUT is a look up table consisiting of pixel data.
Signed-off-by: Arun R Murthy <arun.r.murthy@xxxxxxxxx>
---
drivers/gpu/drm/i915/Makefile | 1 +
.../drm/i915/display/intel_display_types.h | 3 +
.../gpu/drm/i915/display/intel_global_hist.c | 295 ++++++++++++++++++
.../gpu/drm/i915/display/intel_global_hist.h | 117 +++++++
4 files changed, 416 insertions(+)
create mode 100644 drivers/gpu/drm/i915/display/intel_global_hist.c
create mode 100644 drivers/gpu/drm/i915/display/intel_global_hist.h
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 5ab909ec24e5..eac1e0d7bd30 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -295,6 +295,7 @@ i915-y += \
display/intel_dpll.o \
display/intel_dpll_mgr.o \
display/intel_dpt.o \
+ display/intel_global_hist.o \
display/intel_drrs.o \
display/intel_dsb.o \
display/intel_fb.o \
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index ac6951b3e5bd..9848fcf73b87 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1462,6 +1462,9 @@ struct intel_crtc {
/* for loading single buffered registers during vblank */
struct pm_qos_request vblank_pm_qos;
+ /* GLOBAL_HIST data */
+ struct intel_global_hist *global_hist;
+
#ifdef CONFIG_DEBUG_FS
struct intel_pipe_crc pipe_crc;
u32 cpu_fifo_underrun_count;
diff --git a/drivers/gpu/drm/i915/display/intel_global_hist.c b/drivers/gpu/drm/i915/display/intel_global_hist.c
new file mode 100644
index 000000000000..ea5bcd195017
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_global_hist.c
@@ -0,0 +1,295 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2022 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#include <drm/drm_device.h>
+#include <drm/drm_file.h>
+#include "i915_reg.h"
+#include "i915_drv.h"
+#include "intel_display_types.h"
+#include "intel_de.h"
+#include "intel_global_hist.h"
+
+static int intel_global_hist_get_data(struct drm_i915_private *i915,
+ enum pipe pipe)
+{
+ struct intel_crtc *intel_crtc = to_intel_crtc(
+ drm_crtc_from_index(&i915->drm, pipe));
+ struct intel_global_hist *global_hist = intel_crtc->global_hist;
+ u32 dpstbin;
+ int ret = 0, i = 0;
+
+ /*
+ * TODO: PSR to be exited while reading the Histogram data
+ * Set DPST_CTL Bin Reg function select to TC
+ * Set DPST_CTL Bin Register Index to 0
+ */
+ intel_de_rmw(i915, DPST_CTL(pipe),
+ DPST_CTL_BIN_REG_FUNC_SEL | DPST_CTL_BIN_REG_MASK, 0);
+
+ for (i = 0; i < GLOBAL_HIST_BIN_COUNT; i++) {
+ dpstbin = intel_de_read(i915, DPST_BIN(pipe));
+ if (dpstbin & DPST_BIN_BUSY) {
+ /*
+ * If DPST_BIN busy bit is set, then set the
+ * DPST_CTL bin reg index to 0 and proceed
+ * from begining
+ */
+ intel_de_rmw(i915, DPST_CTL(pipe),
+ DPST_CTL_BIN_REG_MASK, 0);
+ i = 0;
+ }
+ global_hist->bindata[i] = dpstbin & DPST_BIN_DATA_MASK;
+ drm_dbg_atomic(&i915->drm, "Hist[%d]=%x\n",
+ i, global_hist->bindata[i]);
+ }
+
+ /* Clear histogram interrupt by setting histogram interrupt status bit*/
+ intel_de_rmw(i915, DPST_GUARD(pipe),
+ DPST_GUARD_HIST_EVENT_STATUS, 1);
+
+ return ret;
+}
+
+int intel_global_hist_compute_config(struct intel_crtc *intel_crtc)
+{
+ struct intel_global_hist *global_hist = intel_crtc->global_hist;
+ struct drm_i915_private *i915 = global_hist->i915;
+
+ if (!global_hist->has_edp) {
+ drm_err(&i915->drm, "Not a eDP panel\n");
+ return -EINVAL;
+ }
+ if (!global_hist->has_pwm) {
+ drm_err(&i915->drm, "eDP doesn't have PWM based backlight, cannot enable GLOBAL_HIST\n");
+ return -EINVAL;
+ }
+ /* Restrictions for enabling GLOBAL_HIST */
+ global_hist->can_enable = true;
+ return 0;
+}
+
+static void intel_global_hist_handle_int_work(struct work_struct *work)
+{
+ struct intel_global_hist *global_hist = container_of(work,
+ struct intel_global_hist, handle_global_hist_int_work.work);
+ struct drm_i915_private *i915 = global_hist->i915;
+ char *global_hist_event[] = {"GLOBAL_HIST=1", NULL};
+
+ /* Notify user for Histogram rediness */
+ if (kobject_uevent_env(&i915->drm.primary->kdev->kobj, KOBJ_CHANGE,
+ global_hist_event))
+ drm_err(&i915->drm, "sending GLOBAL_HIST event failed\n");
+ intel_global_hist_get_data(i915, global_hist->pipe);
+}
+
+void intel_global_hist_irq_handler(struct drm_i915_private *i915, enum pipe pipe)
+{
+ struct intel_crtc *intel_crtc =
+ to_intel_crtc(drm_crtc_from_index(&i915->drm, pipe));
+ struct intel_global_hist *global_hist = intel_crtc->global_hist;
+
+ if (!global_hist->has_pwm) {
+ drm_err(&i915->drm,
+ "eDP doesn't have PWM based backlight, failure in GLOBAL_HIST\n");
+ return;
+ }
+ queue_delayed_work(global_hist->wq,
+ &global_hist->handle_global_hist_int_work, 0);
+}
+static void intel_global_hist_enable_dithering(struct drm_i915_private *dev_priv,
+ enum pipe pipe)
+{
+ intel_de_rmw(dev_priv, PIPEMISC(pipe), PIPEMISC_DITHER_ENABLE,
+ PIPEMISC_DITHER_ENABLE);
+}
+
+static int intel_global_hist_enable(struct intel_crtc *intel_crtc)
+{
+ struct drm_i915_private *i915 = to_i915(intel_crtc->base.dev);
+ struct intel_global_hist *global_hist = intel_crtc->global_hist;
+ int pipe = intel_crtc->pipe;
+ uint32_t gbandthreshold;
+
+ if (!global_hist->has_pwm) {
+ drm_err(&i915->drm,
+ "eDP doesn't have PWM based backlight, cannot enable GLOBAL_HIST\n");
+ return -EINVAL;
+ }
+
+ /* Pipe Dithering should be enabled with GLOBAL_HIST */
+ intel_global_hist_enable_dithering(i915, pipe);
+
+ /*
+ * enable DPST_CTL Histogram mode
+ * Clear DPST_CTL Bin Reg function select to TC
+ */
+ intel_de_rmw(i915, DPST_CTL(pipe),
+ DPST_CTL_BIN_REG_FUNC_SEL | DPST_CTL_IE_HIST_EN |
+ DPST_CTL_HIST_MODE | DPST_CTL_IE_TABLE_VALUE_FORMAT,
+ DPST_CTL_BIN_REG_FUNC_TC | DPST_CTL_IE_HIST_EN |
+ DPST_CTL_HIST_MODE_HSV |
+ DPST_CTL_IE_TABLE_VALUE_FORMAT_1INT_9FRAC);
+ /* check if wait for one vblank is required */
+ drm_crtc_wait_one_vblank(&intel_crtc->base);
+
+ /* TODO: one time programming: Program GuardBand Threshold */
+ gbandthreshold = ((intel_crtc->config->hw.adjusted_mode.vtotal *
+ intel_crtc->config->hw.adjusted_mode.htotal) *
+ GLOBAL_HIST_GUARDBAND_THRESHOLD_DEFAULT) /
+ GLOBAL_HIST_GUARDBAND_PRECISION_FACTOR;
+
+ /* Enable histogram interrupt mode */
+ intel_de_rmw(i915, DPST_GUARD(pipe),
+ DPST_GUARD_THRESHOLD_GB_MASK |
+ DPST_GUARD_INTERRUPT_DELAY_MASK | DPST_GUARD_HIST_INT_EN,
+ DPST_GUARD_THRESHOLD_GB(gbandthreshold) |
+ DPST_GUARD_INTERRUPT_DELAY(GLOBAL_HIST_DEFAULT_GUARDBAND_DELAY) |
+ DPST_GUARD_HIST_INT_EN);
+
+ /* Clear pending interrupts has to be done on seperate write */
+ intel_de_rmw(i915, DPST_GUARD(pipe),
+ DPST_GUARD_HIST_EVENT_STATUS, 1);
+
+ global_hist->enable = true;
+
+ return 0;
+}
+
+static int intel_global_hist_disable(struct intel_crtc *intel_crtc)
+{
+ struct drm_i915_private *i915 = to_i915(intel_crtc->base.dev);
+ struct intel_global_hist *global_hist = intel_crtc->global_hist;
+ int pipe = intel_crtc->pipe;
+
+ /* Pipe Dithering should be enabled with GLOBAL_HIST */
+ intel_global_hist_enable_dithering(i915, pipe);
+
+ /* Clear pending interrupts and disable interrupts */
+ intel_de_rmw(i915, DPST_GUARD(pipe),
+ DPST_GUARD_HIST_INT_EN | DPST_GUARD_HIST_EVENT_STATUS, 0);
+
+ /* disable DPST_CTL Histogram mode */
+ intel_de_rmw(i915, DPST_CTL(pipe),
+ DPST_CTL_IE_HIST_EN, 0);
+
+ cancel_delayed_work(&global_hist->handle_global_hist_int_work);
+ global_hist->enable = false;
+
+ return 0;
+}
+
+int intel_global_hist_update(struct intel_crtc *intel_crtc, bool enable)
+{
+ struct intel_global_hist *global_hist = intel_crtc->global_hist;
+ struct drm_i915_private *i915 = to_i915(intel_crtc->base.dev);
+
+ if (!global_hist->can_enable) {
+ drm_err(&i915->drm,
+ "GLOBAL_HIST not supported, compute config failed\n");
+ return 0;
+ }
+
+ if (enable)
+ return intel_global_hist_enable(intel_crtc);
+ else
+ return intel_global_hist_disable(intel_crtc);
+}
+
+int intel_global_hist_set_iet_lut(struct intel_crtc *intel_crtc, u32 *data)
+{
+ struct intel_global_hist *global_hist = intel_crtc->global_hist;
+ struct drm_i915_private *i915 = to_i915(intel_crtc->base.dev);
+ int pipe = intel_crtc->pipe;
+ int i = 0;
+
+ if (!global_hist->enable) {
+ drm_err(&i915->drm, "GLOBAL_HIST not enabled");
+ return -EINVAL;
+ }
+
+ /*
+ * Set DPST_CTL Bin Reg function select to IE
+ * Set DPST_CTL Bin Register Index to 0
+ */
+ intel_de_rmw(i915, DPST_CTL(pipe),
+ DPST_CTL_BIN_REG_FUNC_SEL | DPST_CTL_BIN_REG_MASK,
+ DPST_CTL_BIN_REG_FUNC_IE | DPST_CTL_BIN_REG_CLEAR);
+ for (i = 0; i < GLOBAL_HIST_IET_LENGTH; i++) {
+ intel_de_rmw(i915, DPST_BIN(pipe),
+ DPST_BIN_DATA_MASK, data[i]);
+ drm_dbg_atomic(&i915->drm, "iet_lut[%d]=%x\n", i, data[i]);
+ }
+ intel_de_rmw(i915, DPST_CTL(pipe),
+ DPST_CTL_ENHANCEMENT_MODE_MASK | DPST_CTL_IE_MODI_TABLE_EN,
+ DPST_CTL_EN_MULTIPLICATIVE | DPST_CTL_IE_MODI_TABLE_EN);
+ /* Once IE is applied, change DPST CTL to TC */
+ intel_de_rmw(i915, DPST_CTL(pipe),
+ DPST_CTL_BIN_REG_FUNC_SEL, DPST_CTL_BIN_REG_FUNC_TC);
+
+ return 0;
+}
+
+void intel_global_hist_deinit(struct intel_crtc *intel_crtc)
+{
+ struct intel_global_hist *global_hist = intel_crtc->global_hist;
+
+ cancel_delayed_work(&global_hist->handle_global_hist_int_work);
+ destroy_workqueue(global_hist->wq);
+ kfree(global_hist);
+}
+
+int intel_global_hist_init(struct intel_crtc *intel_crtc)
+{
+ struct drm_i915_private *i915 = to_i915(intel_crtc->base.dev);
+ struct intel_global_hist *global_hist;
+
+ /* Allocate global_hist internal struct */
+ global_hist = kzalloc(sizeof(*global_hist), GFP_KERNEL);
+ if (unlikely(!global_hist)) {
+ drm_err(&i915->drm,
+ "Failed to allocate GLOBAL_HIST event\n");
+ kfree(global_hist);
+ return -ENOMEM;
+ }
+
+ intel_crtc->global_hist = global_hist;
+ global_hist->pipe = intel_crtc->pipe;
+ global_hist->can_enable = false;
+ global_hist->wq = alloc_ordered_workqueue("global_hist_wq",
+ WQ_MEM_RECLAIM);
+ if (global_hist->wq == NULL) {
+ drm_err(&i915->drm,
+ "failed to create work queue\n");
+ kfree(global_hist);
+ return -ENOMEM;
+ }
+
+ INIT_DEFERRABLE_WORK(&global_hist->handle_global_hist_int_work,
+ intel_global_hist_handle_int_work);
+
+ global_hist->i915 = i915;
+
+ return 0;
+}
diff --git a/drivers/gpu/drm/i915/display/intel_global_hist.h b/drivers/gpu/drm/i915/display/intel_global_hist.h
new file mode 100644
index 000000000000..c6621bf4ea61
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_global_hist.h
@@ -0,0 +1,117 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2022 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#ifndef __INTEL_GLOBAL_HIST_H__
+#define __INTEL_GLOBAL_HIST_H__
+
+#include <drm/drm_device.h>
+#include <drm/drm_file.h>
+#include "intel_display.h"
+#include "../i915_reg.h"
+
+/* GLOBAL_HIST related registers */
+#define _DPST_CTL_A 0x490C0
+#define _DPST_CTL_B 0x491C0
+#define DPST_CTL(pipe) _MMIO_PIPE(pipe, _DPST_CTL_A, _DPST_CTL_B)
+#define DPST_CTL_IE_HIST_EN REG_BIT(31)
+#define DPST_CTL_IE_MODI_TABLE_EN REG_BIT(27)
+#define DPST_CTL_HIST_MODE REG_BIT(24)
+#define DPST_CTL_ENHANCEMENT_MODE_MASK REG_GENMASK(14, 13)
+#define DPST_CTL_EN_MULTIPLICATIVE REG_FIELD_PREP(DPST_CTL_ENHANCEMENT_MODE_MASK, 2)
+#define DPST_CTL_IE_TABLE_VALUE_FORMAT REG_BIT(15)
+#define DPST_CTL_BIN_REG_FUNC_SEL REG_BIT(11)
+#define DPST_CTL_BIN_REG_FUNC_TC (0 << 0)
+#define DPST_CTL_BIN_REG_FUNC_IE (1 << 11)
+#define DPST_CTL_BIN_REG_MASK REG_GENMASK(6, 0)
+#define DPST_CTL_BIN_REG_CLEAR REG_FIELD_PREP(DPST_CTL_BIN_REG_MASK, 0)
+
+#define _DPST_GUARD_A 0x490C8
+#define _DPST_GUARD_B 0x491C8
+#define DPST_GUARD(pipe) _MMIO_PIPE(pipe, _DPST_GUARD_A, _DPST_GUARD_B)
+#define DPST_GUARD_HIST_INT_EN REG_BIT(31)
+#define DPST_GUARD_HIST_EVENT_STATUS REG_BIT(30)
+#define DPST_GUARD_INTERRUPT_DELAY_MASK REG_GENMASK(29, 22)
+#define DPST_GUARD_INTERRUPT_DELAY(val) REG_FIELD_PREP(DPST_GUARD_INTERRUPT_DELAY_MASK, val)
+#define DPST_GUARD_THRESHOLD_GB_MASK REG_GENMASK(21, 0)
+#define DPST_GUARD_THRESHOLD_GB(val) REG_FIELD_PREP(DPST_GUARD_THRESHOLD_GB_MASK, val)
+
+#define _DPST_BIN_A 0x490C4
+#define _DPST_BIN_B 0x491C4
+#define DPST_BIN(pipe) _MMIO_PIPE(pipe, _DPST_BIN_A, _DPST_BIN_B)
+#define DPST_BIN_DATA_MASK REG_GENMASK(23, 0)
+#define DPST_BIN_BUSY REG_BIT(31)
+
+#define DPST_CTL_IE_TABLE_VALUE_FORMAT_2INT_8FRAC (1 << 15)
+#define DPST_CTL_IE_TABLE_VALUE_FORMAT_1INT_9FRAC (0 << 15)
+#define DPST_CTL_HIST_MODE_YUV (0 << 24)
+#define DPST_CTL_HIST_MODE_HSV (1 << 24)
+
+
+#define INTEL_GLOBAL_HISTOGRAM_PIPEA 0x90000000
+#define INTEL_GLOBAL_HISTOGRAM_PIPEB 0x90000002
+#define INTEL_GLOBAL_HISTOGRAM_EVENT(pipe) _PIPE(pipe, \
+ INTEL_GLOBAL_HISTOGRAM_PIPEA, \
+ INTEL_GLOBAL_HISTOGRAM_PIPEB)
+
+#define GLOBAL_HIST_BIN_COUNT 32
+#define GLOBAL_HIST_IET_LENGTH 33
+
+#define GLOBAL_HIST_GUARDBAND_THRESHOLD_DEFAULT 300 // 3.0% of the pipe's current pixel count.
+#define GLOBAL_HIST_GUARDBAND_PRECISION_FACTOR 10000 // Precision factor for threshold guardband.
+#define GLOBAL_HIST_DEFAULT_GUARDBAND_DELAY 0x04
+
+enum intel_global_hist_status {
+ INTEL_GLOBAL_HIST_ENABLE,
+ INTEL_GLOBAL_HIST_DISABLE,
+};
+
+enum intel_global_histogram {
+ INTEL_GLOBAL_HISTOGRAM,
+};
+
+enum intel_global_hist_lut {
+ INTEL_GLOBAL_HIST_PIXEL_FACTOR,
+};
+
+struct intel_global_hist {
+ struct drm_i915_private *i915;
+ struct workqueue_struct *wq;
+ struct delayed_work handle_global_hist_int_work;
+ bool enable;
+ bool has_pwm;
+ bool has_edp;
+ bool can_enable;
+ enum pipe pipe;
+ u32 bindata[GLOBAL_HIST_BIN_COUNT];
+};
+
+int intel_global_hist_compute_config(struct intel_crtc *intel_crtc);
+void intel_global_hist_irq_handler(struct drm_i915_private *i915, enum pipe pipe);
+int intel_global_hist_update(struct intel_crtc *intel_crtc, bool enable);
+int intel_global_hist_set_iet_lut(struct intel_crtc *intel_crtc, u32 *data);
+int intel_global_hist_init(struct intel_crtc *intel_crtc);
+void intel_global_hist_deinit(struct intel_crtc *intel_crtc);
+
+#endif /* __INTEL_GLOBAL_HIST_H__ */
--
2.25.1
