Add functions to enable darkscreen detection and corresponding additions to Makefile to build them. The enable and detect functions will be used in case we encounter a FIFO underrun which will help to check if a darkscreen occurred.
Signed-off-by: Suraj Kandpal <[email protected]> Signed-off-by: Nemesa Garg <[email protected]> --- drivers/gpu/drm/i915/Makefile | 1 + .../gpu/drm/i915/display/intel_darkscreen.c | 139 ++++++++++++++++++ .../gpu/drm/i915/display/intel_darkscreen.h | 25 ++++ .../drm/i915/display/intel_display_types.h | 3 + drivers/gpu/drm/xe/Makefile | 1 + 5 files changed, 169 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 7cad944b825c..00e36169a74d 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -255,6 +255,7 @@ 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..3ac3e8e6c1e3 --- /dev/null +++ b/drivers/gpu/drm/i915/display/intel_darkscreen.c @@ -0,0 +1,139 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2023 Intel Corporation + */ + +#include "i915_reg.h" +#include "intel_de.h" +#include "intel_display_types.h" + +#define COLOR_DEPTH_6BPC 6 +#define COLOR_DEPTH_8BPC 8 +#define COLOR_DEPTH_10BPC 10 +#define COLOR_DEPTH_12BPC 12 + +#define COMPARE_VALUE_6_BPC 4 +#define COMPARE_VALUE_8_BPC 16 +#define COMPARE_VALUE_10_BPC 64 +#define COMPARE_VALUE_12_BPC 256 + +#define COMPARE_VALUE_CALCULATION_FACTOR 12 + +static void intel_darkscreen_detect(struct intel_crtc *crtc); + +static u32 intel_darkscreen_get_comp_val(struct drm_i915_private *i915, int bpc) +{ + u32 compare_value = 0; + + switch (bpc) { + case COLOR_DEPTH_6BPC: + compare_value = COMPARE_VALUE_6_BPC; + break; + case COLOR_DEPTH_8BPC: + compare_value = COMPARE_VALUE_8_BPC; + break; + case COLOR_DEPTH_10BPC: + compare_value = COMPARE_VALUE_10_BPC; + break; + case COLOR_DEPTH_12BPC: + compare_value = COMPARE_VALUE_12_BPC; + break; + default: + drm_dbg(&i915->drm, "Bpc value is incorrect:%d\n", bpc); + return -EINVAL; + } + + compare_value = compare_value << (COMPARE_VALUE_CALCULATION_FACTOR - bpc); + return DARK_SCREEN_COMPARE_VAL(compare_value); +} + +static void intel_darkscreen_work_fn(struct work_struct *work) +{ + struct intel_darkscreen *dark_screen = + container_of(work, typeof(*dark_screen), darkscreen_detect_work); + + if (!dark_screen->enable) + intel_darkscreen_enable(dark_screen->crtc); + + intel_darkscreen_detect(dark_screen->crtc); +} + +void intel_darkscreen_schedule_work(struct intel_crtc *crtc) +{ + struct drm_i915_private *i915 = to_i915(crtc->base.dev); + struct intel_darkscreen *dark_screen = &crtc->dark_screen; + + dark_screen->crtc = crtc; + queue_work(i915->unordered_wq, &dark_screen->darkscreen_detect_work); +} + +void intel_darkscreen_setup(struct intel_crtc *crtc) +{ + struct intel_darkscreen *dark_screen; + + dark_screen = &crtc->dark_screen; + dark_screen = kzalloc(sizeof(*dark_screen), GFP_KERNEL); + if (!dark_screen) + return; + dark_screen->enable = false; + + INIT_WORK(&dark_screen->darkscreen_detect_work, intel_darkscreen_work_fn); +} + +/* + * Check the color format and compute the compare value based on bpc. + */ +int intel_darkscreen_enable(struct intel_crtc *crtc) +{ + struct intel_crtc_state *crtc_state = crtc->config; + enum transcoder cpu_transcoder = crtc_state->cpu_transcoder; + struct drm_i915_private *dev_priv = to_i915(crtc->base.dev); + int bpc = crtc_state->pipe_bpp / 3; + u32 val; + + if (!crtc->dark_screen.enable) + return 0; + + if (crtc_state->output_format != INTEL_OUTPUT_FORMAT_RGB) { + drm_dbg_kms(&dev_priv->drm, + "YUV format not supported:%c for darkscreen detection\n", + pipe_name(crtc->pipe)); + return -EPROTO; + } + + val = intel_darkscreen_get_comp_val(dev_priv, bpc); + val |= DARK_SCREEN_ENABLE; + intel_de_write(dev_priv, DARK_SCREEN(cpu_transcoder), val); + crtc->dark_screen.enable = true; + + return 0; +} + +static void intel_darkscreen_detect(struct intel_crtc *crtc) +{ + struct intel_crtc_state *crtc_state = crtc->config; + struct drm_i915_private *dev_priv = to_i915(crtc->base.dev); + unsigned int frame_time_in_us; + u32 val = 0; + + val |= DARK_SCREEN_DETECT | DARK_SCREEN_DONE; + intel_de_rmw(dev_priv, DARK_SCREEN(crtc->config->cpu_transcoder), 0, val); + + frame_time_in_us = (1000 / drm_mode_vrefresh(&crtc_state->hw.adjusted_mode)) * 2; + intel_de_wait_for_set(dev_priv, DARK_SCREEN(crtc->config->cpu_transcoder), + DARK_SCREEN_DONE, frame_time_in_us); + + if (intel_de_read(dev_priv, DARK_SCREEN(crtc->config->cpu_transcoder)) & + DARK_SCREEN_DETECT) { + drm_dbg_kms(&dev_priv->drm, "Dark screen detected:%c\n", pipe_name(crtc->pipe)); + } +} + +void intel_darkscreen_disable(struct intel_crtc *crtc) +{ + struct intel_crtc_state *crtc_state = crtc->config; + enum transcoder cpu_transcoder = crtc_state->cpu_transcoder; + struct drm_i915_private *dev_priv = to_i915(crtc->base.dev); + + intel_de_write(dev_priv, DARK_SCREEN(cpu_transcoder), 0); +} 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..3b4b3d3df672 --- /dev/null +++ b/drivers/gpu/drm/i915/display/intel_darkscreen.h @@ -0,0 +1,25 @@ +/* SPDX-License-Identifier: MIT */ +/* + * Copyright © 2023 Intel Corporation + */ + +#ifndef __INTEL_DARKSCREEN_H__ +#define __INTEL_DARKSCREEN_H__ + +#include <linux/types.h> +#include <linux/workqueue.h> + +struct intel_crtc; + +struct intel_darkscreen { + bool enable; + struct work_struct darkscreen_detect_work; + struct intel_crtc *crtc; +}; + +void intel_darkscreen_setup(struct intel_crtc *crtc); +int intel_darkscreen_enable(struct intel_crtc *crtc); +void intel_darkscreen_disable(struct intel_crtc *crtc); +void intel_darkscreen_schedule_work(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 62f7a30c37dc..177cf5ff8d77 100644 --- a/drivers/gpu/drm/i915/display/intel_display_types.h +++ b/drivers/gpu/drm/i915/display/intel_display_types.h @@ -50,6 +50,7 @@ #include "i915_vma.h" #include "i915_vma_types.h" #include "intel_bios.h" +#include "intel_darkscreen.h" #include "intel_display.h" #include "intel_display_limits.h" #include "intel_display_power.h" @@ -1511,6 +1512,8 @@ 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/xe/Makefile b/drivers/gpu/drm/xe/Makefile index 8321ec4f9b46..c83217e20cb9 100644 --- a/drivers/gpu/drm/xe/Makefile +++ b/drivers/gpu/drm/xe/Makefile @@ -228,6 +228,7 @@ xe-$(CONFIG_DRM_XE_DISPLAY) += \ i915-display/intel_crtc_state_dump.o \ i915-display/intel_cursor.o \ i915-display/intel_cx0_phy.o \ + i915-display/intel_darkscreen.o \ i915-display/intel_ddi.o \ i915-display/intel_ddi_buf_trans.o \ i915-display/intel_display.o \ -- 2.43.2
