Add new registers for Darkscreen
The logic checks for any black screen at pipe level and upon such detection prints error.
Darkscreen compares the pixels with the compare value(0x00 - black) for the detection purpose.
This feature can be enable/disable through debugfs.
Signed-off-by: Nemesa Garg <nemesa.garg@xxxxxxxxx>
---
drivers/gpu/drm/i915/Makefile | 1 +
.../gpu/drm/i915/display/intel_darkscreen.c | 69 +++++++++++++++++++
.../gpu/drm/i915/display/intel_darkscreen.h | 40 +++++++++++
.../drm/i915/display/intel_display_types.h | 3 +
drivers/gpu/drm/i915/i915_reg.h | 9 +++
5 files changed, 122 insertions(+)
create mode 100644 drivers/gpu/drm/i915/display/intel_darkscreen.c
create mode 100644 drivers/gpu/drm/i915/display/intel_darkscreen.h
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 88b2bb005014..538d5a42f9e3 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -254,6 +254,7 @@ i915-y += \
display/intel_crtc.o \
display/intel_crtc_state_dump.o \
display/intel_cursor.o \
+ display/intel_darkscreen.o \
display/intel_display.o \
display/intel_display_driver.o \
display/intel_display_irq.o \
diff --git a/drivers/gpu/drm/i915/display/intel_darkscreen.c b/drivers/gpu/drm/i915/display/intel_darkscreen.c
new file mode 100644
index 000000000000..ef68dbc7a296
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_darkscreen.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2018 Intel Corporation
+ *
+ * Author: Nemesa Garg <nemesa.garg@xxxxxxxxx>
+ */
+#include "i915_reg.h"
+#include "intel_display_types.h"
+#include "intel_de.h"
+
+/*
+ * Dark screen detection check if all pixels
+ * in a frame are less than or equal to compare
+ * value.Check the color format and compute the
+ * compare value based on bpc.
+ */
+void dark_screen_enable(struct intel_crtc_state *crtc_state)
+{
+ u32 comparevalue;
+ enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
+ struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+ struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+
+ if (!crtc->dark_screen.enable)
+ return;
+
+ if (crtc_state->output_format != INTEL_OUTPUT_FORMAT_RGB)
+ return;
+ drm_err(&dev_priv->drm,
+ "RGB format is not present%c\n",
+ pipe_name(crtc->pipe));
+
+ switch (crtc_state->pipe_bpp / 3) {
+ case DD_COLOR_DEPTH_6BPC:
+ comparevalue = DARKSCREEN_COMPARE_VALUE_LIMITED_RANGE_6_BPC;
+ break;
+ case DD_COLOR_DEPTH_8BPC:
+ comparevalue = DARKSCREEN_COMPARE_VALUE_LIMITED_RANGE_8_BPC;
+ break;
+ case DD_COLOR_DEPTH_10BPC:
+ comparevalue = DARKSCREEN_COMPARE_VALUE_LIMITED_RANGE_10_BPC;
+ break;
+ case DD_COLOR_DEPTH_12BPC:
+ comparevalue = DARKSCREEN_COMPARE_VALUE_LIMITED_RANGE_12_BPC;
+ break;
+ default:
+ break;
+ }
+
+ comparevalue = comparevalue <<
+ (DARKSCREEN_PROGRAMMED_COMPARE_VALUE_CALCULATION_FACTOR - crtc->dark_screen.bpc);
+
+ intel_de_write(dev_priv, DARK_SCREEN(cpu_transcoder),
+ DARK_SCREEN_ENABLE | DARK_SCREEN_DETECT |
+ DARK_SCREEN_DONE | DARK_SCREEN_COMPARE_VAL(comparevalue));
+
+ intel_de_wait_for_set(dev_priv,
+ DARK_SCREEN(crtc->config->cpu_transcoder), DARK_SCREEN_DONE, 1);
+
+ if (intel_de_read(dev_priv, DARK_SCREEN(crtc->config->cpu_transcoder)) &
+ DARK_SCREEN_DETECT) {
+ drm_err(&dev_priv->drm,
+ "Dark Screen detected %c\n",
+ pipe_name(crtc->pipe));
+ }
+
+ intel_de_rmw(dev_priv, DARK_SCREEN(crtc->config->cpu_transcoder), 0, DARK_SCREEN_DETECT |
+ DARK_SCREEN_DONE);
+}
diff --git a/drivers/gpu/drm/i915/display/intel_darkscreen.h b/drivers/gpu/drm/i915/display/intel_darkscreen.h
new file mode 100644
index 000000000000..69da1ea56829
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_darkscreen.h
@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2018 Intel Corporation
+ *
+ * Author: Nemesa Garg <nemesa.garg@xxxxxxxxx>
+ */
+
+#ifndef __INTEL_DARKSCREEN_H__
+#define __INTEL_DARKSCREEN_H__
+
+#include <drm/drm_device.h>
+
+#define DD_COLOR_DEPTH_6BPC 6
+#define DD_COLOR_DEPTH_8BPC 8
+#define DD_COLOR_DEPTH_10BPC 10
+#define DD_COLOR_DEPTH_12BPC 12
+
+// HW Darkscreen Detection Macros
+#define DARKSCREEN_PROGRAMMED_COMPARE_VALUE_CALCULATION_FACTOR 12
+
+// Compare Value = 16*(2 ^ (bpc-8))
+#define DARKSCREEN_COMPARE_VALUE_LIMITED_RANGE_6_BPC 4
+#define DARKSCREEN_COMPARE_VALUE_LIMITED_RANGE_8_BPC 16
+#define DARKSCREEN_COMPARE_VALUE_LIMITED_RANGE_10_BPC 64
+#define DARKSCREEN_COMPARE_VALUE_LIMITED_RANGE_12_BPC 256
+
+struct intel_crtc_state;
+struct intel_crtc;
+
+struct intel_darkscreen {
+ bool enable;
+ u64 timer_value;
+ u8 bpc;
+ struct hrtimer timer;
+};
+
+void dark_screen_enable(struct intel_crtc_state *crtc_state);
+void intel_darkscreen_crtc_debugfs_add(struct intel_crtc *crtc);
+
+#endif /* __INTEL_DARKSCREEN_H_ */
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 65ea37fe8cff..289ecda2e032 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -54,6 +54,7 @@
#include "intel_display_power.h"
#include "intel_dpll_mgr.h"
#include "intel_wm_types.h"
+#include "intel_darkscreen.h"
struct drm_printer;
struct __intel_global_objs_state;
@@ -1515,6 +1516,8 @@ struct intel_crtc {
/* for loading single buffered registers during vblank */
struct pm_qos_request vblank_pm_qos;
+ struct intel_darkscreen dark_screen;
+
#ifdef CONFIG_DEBUG_FS
struct intel_pipe_crc pipe_crc;
#endif
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 135e8d8dbdf0..01d9de14f79c 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2097,6 +2097,15 @@
#define TRANS_PUSH_EN REG_BIT(31)
#define TRANS_PUSH_SEND REG_BIT(30)
+/* Dark SCREEN */
+#define _DARK_SCREEN_PIPE_A 0x60120
+#define DARK_SCREEN(trans) _MMIO_TRANS2(trans, _DARK_SCREEN_PIPE_A)
+#define DARK_SCREEN_ENABLE REG_BIT(31)
+#define DARK_SCREEN_DETECT REG_BIT(29)
+#define DARK_SCREEN_DONE REG_BIT(28)
+#define DARK_SCREEN_COMPARE_MASK REG_GENMASK(9, 0)
+#define DARK_SCREEN_COMPARE_VAL(x) REG_FIELD_PREP(DARK_SCREEN_COMPARE_MASK, (x))
+
/* VGA port control */
#define ADPA _MMIO(0x61100)
#define PCH_ADPA _MMIO(0xe1100)
--
2.25.1
