Quelle intel_display_driver.c
Sprache: C
// SPDX-License-Identifier: MIT
/*
* Copyright © 2022 - 2023 Intel Corporation
*
* High level display driver entry points . This is a layer between top level
* driver code and low level display functionality ; no low level display code or
* details here .
*/
#include <linux/vga_switcheroo.h>
#include <acpi/video.h>
#include <drm/display/drm_dp_mst_helper.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_client_event.h>
#include <drm/drm_mode_config.h>
#include <drm/drm_privacy_screen_consumer.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_vblank.h>
#include "i915_drv.h"
#include "i9xx_wm.h"
#include "intel_acpi.h"
#include "intel_atomic.h"
#include "intel_audio.h"
#include "intel_bios.h"
#include "intel_bw.h"
#include "intel_cdclk.h"
#include "intel_color.h"
#include "intel_crtc.h"
#include "intel_display_core.h"
#include "intel_display_debugfs.h"
#include "intel_display_driver.h"
#include "intel_display_irq.h"
#include "intel_display_power.h"
#include "intel_display_types.h"
#include "intel_display_wa.h"
#include "intel_dkl_phy.h"
#include "intel_dmc.h"
#include "intel_dp.h"
#include "intel_dp_tunnel.h"
#include "intel_dpll.h"
#include "intel_dpll_mgr.h"
#include "intel_fb.h"
#include "intel_fbc.h"
#include "intel_fbdev.h"
#include "intel_fdi.h"
#include "intel_flipq.h"
#include "intel_gmbus.h"
#include "intel_hdcp.h"
#include "intel_hotplug.h"
#include "intel_hti.h"
#include "intel_modeset_lock.h"
#include "intel_modeset_setup.h"
#include "intel_opregion.h"
#include "intel_overlay.h"
#include "intel_plane_initial.h"
#include "intel_pmdemand.h"
#include "intel_pps.h"
#include "intel_psr.h"
#include "intel_quirks.h"
#include "intel_vga.h"
#include "intel_wm.h"
#include "skl_watermark.h"
bool intel_display_driver_probe_defer(struct pci_dev *pdev)
{
struct drm_privacy_screen *privacy_screen;
/*
* apple - gmux is needed on dual GPU MacBook Pro
* to probe the panel if we ' re the inactive GPU .
*/
if (vga_switcheroo_client_probe_defer(pdev))
return true ;
/* If the LCD panel has a privacy-screen, wait for it */
privacy_screen = drm_privacy_screen_get(&pdev->dev, NULL);
if (IS_ERR(privacy_screen) && PTR_ERR(privacy_screen) == -EPROBE_DEFER)
return true ;
drm_privacy_screen_put(privacy_screen);
return false ;
}
void intel_display_driver_init_hw(struct intel_display *display)
{
if (!HAS_DISPLAY(display))
return ;
intel_cdclk_read_hw(display);
intel_display_wa_apply(display);
}
static const struct drm_mode_config_funcs intel_mode_funcs = {
.fb_create = intel_user_framebuffer_create,
.get_format_info = intel_fb_get_format_info,
.mode_valid = intel_mode_valid,
.atomic_check = intel_atomic_check,
.atomic_commit = intel_atomic_commit,
.atomic_state_alloc = intel_atomic_state_alloc,
.atomic_state_clear = intel_atomic_state_clear,
.atomic_state_free = intel_atomic_state_free,
};
static const struct drm_mode_config_helper_funcs intel_mode_config_funcs = {
.atomic_commit_setup = drm_dp_mst_atomic_setup_commit,
};
static void intel_mode_config_init(struct intel_display *display)
{
struct drm_mode_config *mode_config = &display->drm->mode_config;
drm_mode_config_init(display->drm);
INIT_LIST_HEAD(&display->global.obj_list);
mode_config->min_width = 0 ;
mode_config->min_height = 0 ;
mode_config->preferred_depth = 24 ;
mode_config->prefer_shadow = 1 ;
mode_config->funcs = &intel_mode_funcs;
mode_config->helper_private = &intel_mode_config_funcs;
mode_config->async_page_flip = HAS_ASYNC_FLIPS(display);
/*
* Maximum framebuffer dimensions , chosen to match
* the maximum render engine surface size on gen4 + .
*/
if (DISPLAY_VER(display) >= 7 ) {
mode_config->max_width = 16384 ;
mode_config->max_height = 16384 ;
} else if (DISPLAY_VER(display) >= 4 ) {
mode_config->max_width = 8192 ;
mode_config->max_height = 8192 ;
} else if (DISPLAY_VER(display) == 3 ) {
mode_config->max_width = 4096 ;
mode_config->max_height = 4096 ;
} else {
mode_config->max_width = 2048 ;
mode_config->max_height = 2048 ;
}
if (display->platform.i845g || display->platform.i865g) {
mode_config->cursor_width = display->platform.i845g ? 64 : 512 ;
mode_config->cursor_height = 1023 ;
} else if (display->platform.i830 || display->platform.i85x ||
display->platform.i915g || display->platform.i915gm) {
mode_config->cursor_width = 64 ;
mode_config->cursor_height = 64 ;
} else {
mode_config->cursor_width = 256 ;
mode_config->cursor_height = 256 ;
}
}
static void intel_mode_config_cleanup(struct intel_display *display)
{
intel_atomic_global_obj_cleanup(display);
drm_mode_config_cleanup(display->drm);
}
static void intel_plane_possible_crtcs_init(struct intel_display *display)
{
struct intel_plane *plane;
for_each_intel_plane(display->drm, plane) {
struct intel_crtc *crtc = intel_crtc_for_pipe(display,
plane->pipe);
plane->base.possible_crtcs = drm_crtc_mask(&crtc->base);
}
}
void intel_display_driver_early_probe(struct intel_display *display)
{
/* This must be called before any calls to HAS_PCH_* */
intel_pch_detect(display);
if (!HAS_DISPLAY(display))
return ;
spin_lock_init(&display->fb_tracking.lock);
mutex_init(&display->backlight.lock);
mutex_init(&display->audio.mutex);
mutex_init(&display->wm.wm_mutex);
mutex_init(&display->pps.mutex);
mutex_init(&display->hdcp.hdcp_mutex);
intel_display_irq_init(display);
intel_dkl_phy_init(display);
intel_color_init_hooks(display);
intel_init_cdclk_hooks(display);
intel_audio_hooks_init(display);
intel_dpll_init_clock_hook(display);
intel_init_display_hooks(display);
intel_fdi_init_hook(display);
intel_dmc_wl_init(display);
}
/* part #1: call before irq install */
int intel_display_driver_probe_noirq(struct intel_display *display)
{
struct drm_i915_private *i915 = to_i915(display->drm);
int ret;
if (i915_inject_probe_failure(i915))
return -ENODEV;
if (HAS_DISPLAY(display)) {
ret = drm_vblank_init(display->drm,
INTEL_NUM_PIPES(display));
if (ret)
return ret;
}
intel_bios_init(display);
ret = intel_vga_register(display);
if (ret)
goto cleanup_bios;
intel_psr_dc5_dc6_wa_init(display);
/* FIXME: completely on the wrong abstraction layer */
ret = intel_power_domains_init(display);
if (ret < 0 )
goto cleanup_vga;
intel_pmdemand_init_early(display);
intel_power_domains_init_hw(display, false );
if (!HAS_DISPLAY(display))
return 0 ;
display->hotplug.dp_wq = alloc_ordered_workqueue("intel-dp" , 0 );
if (!display->hotplug.dp_wq) {
ret = -ENOMEM;
goto cleanup_vga_client_pw_domain_dmc;
}
display->wq.modeset = alloc_ordered_workqueue("i915_modeset" , 0 );
if (!display->wq.modeset) {
ret = -ENOMEM;
goto cleanup_wq_dp;
}
display->wq.flip = alloc_workqueue("i915_flip" , WQ_HIGHPRI |
WQ_UNBOUND, WQ_UNBOUND_MAX_ACTIVE);
if (!display->wq.flip) {
ret = -ENOMEM;
goto cleanup_wq_modeset;
}
display->wq.cleanup = alloc_workqueue("i915_cleanup" , WQ_HIGHPRI, 0 );
if (!display->wq.cleanup) {
ret = -ENOMEM;
goto cleanup_wq_flip;
}
display->wq.unordered = alloc_workqueue("display_unordered" , 0 , 0 );
if (!display->wq.unordered) {
ret = -ENOMEM;
goto cleanup_wq_cleanup;
}
intel_dmc_init(display);
intel_mode_config_init(display);
ret = intel_cdclk_init(display);
if (ret)
goto cleanup_wq_unordered;
ret = intel_color_init(display);
if (ret)
goto cleanup_wq_unordered;
ret = intel_dbuf_init(display);
if (ret)
goto cleanup_wq_unordered;
ret = intel_bw_init(display);
if (ret)
goto cleanup_wq_unordered;
ret = intel_pmdemand_init(display);
if (ret)
goto cleanup_wq_unordered;
intel_init_quirks(display);
intel_fbc_init(display);
return 0 ;
cleanup_wq_unordered:
destroy_workqueue(display->wq.unordered);
cleanup_wq_cleanup:
destroy_workqueue(display->wq.cleanup);
cleanup_wq_flip:
destroy_workqueue(display->wq.flip);
cleanup_wq_modeset:
destroy_workqueue(display->wq.modeset);
cleanup_wq_dp:
destroy_workqueue(display->hotplug.dp_wq);
cleanup_vga_client_pw_domain_dmc:
intel_dmc_fini(display);
intel_power_domains_driver_remove(display);
cleanup_vga:
intel_vga_unregister(display);
cleanup_bios:
intel_bios_driver_remove(display);
return ret;
}
static void set_display_access(struct intel_display *display,
bool any_task_allowed,
struct task_struct *allowed_task)
{
struct drm_modeset_acquire_ctx ctx;
int err;
intel_modeset_lock_ctx_retry(&ctx, NULL, 0 , err) {
err = drm_modeset_lock_all_ctx(display->drm, &ctx);
if (err)
continue ;
display->access.any_task_allowed = any_task_allowed;
display->access.allowed_task = allowed_task;
}
drm_WARN_ON(display->drm, err);
}
/**
* intel_display_driver_enable_user_access - Enable display HW access for all threads
* @ display : display device instance
*
* Enable the display HW access for all threads . Examples for such accesses
* are modeset commits and connector probing .
*
* This function should be called during driver loading and system resume once
* all the HW initialization steps are done .
*/
void intel_display_driver_enable_user_access(struct intel_display *display)
{
set_display_access(display, true , NULL);
intel_hpd_enable_detection_work(display);
}
/**
* intel_display_driver_disable_user_access - Disable display HW access for user threads
* @ display : display device instance
*
* Disable the display HW access for user threads . Examples for such accesses
* are modeset commits and connector probing . For the current thread the
* access is still enabled , which should only perform HW init / deinit
* programming ( as the initial modeset during driver loading or the disabling
* modeset during driver unloading and system suspend / shutdown ) . This function
* should be followed by calling either intel_display_driver_enable_user_access ( )
* after completing the HW init programming or
* intel_display_driver_suspend_access ( ) after completing the HW deinit
* programming .
*
* This function should be called during driver loading / unloading and system
* suspend / shutdown before starting the HW init / deinit programming .
*/
void intel_display_driver_disable_user_access(struct intel_display *display)
{
intel_hpd_disable_detection_work(display);
set_display_access(display, false , current);
}
/**
* intel_display_driver_suspend_access - Suspend display HW access for all threads
* @ display : display device instance
*
* Disable the display HW access for all threads . Examples for such accesses
* are modeset commits and connector probing . This call should be either
* followed by calling intel_display_driver_resume_access ( ) , or the driver
* should be unloaded / shutdown .
*
* This function should be called during driver unloading and system
* suspend / shutdown after completing the HW deinit programming .
*/
void intel_display_driver_suspend_access(struct intel_display *display)
{
set_display_access(display, false , NULL);
}
/**
* intel_display_driver_resume_access - Resume display HW access for the resume thread
* @ display : display device instance
*
* Enable the display HW access for the current resume thread , keeping the
* access disabled for all other ( user ) threads . Examples for such accesses
* are modeset commits and connector probing . The resume thread should only
* perform HW init programming ( as the restoring modeset ) . This function
* should be followed by calling intel_display_driver_enable_user_access ( ) ,
* after completing the HW init programming steps .
*
* This function should be called during system resume before starting the HW
* init steps .
*/
void intel_display_driver_resume_access(struct intel_display *display)
{
set_display_access(display, false , current);
}
/**
* intel_display_driver_check_access - Check if the current thread has disaplay HW access
* @ display : display device instance
*
* Check whether the current thread has display HW access , print a debug
* message if it doesn ' t . Such accesses are modeset commits and connector
* probing . If the function returns % false any HW access should be prevented .
*
* Returns % true if the current thread has display HW access , % false
* otherwise .
*/
bool intel_display_driver_check_access(struct intel_display *display)
{
char current_task[TASK_COMM_LEN + 16 ];
char allowed_task[TASK_COMM_LEN + 16 ] = "none" ;
if (display->access.any_task_allowed ||
display->access.allowed_task == current)
return true ;
snprintf(current_task, sizeof (current_task), "%s[%d]" ,
current->comm, task_pid_vnr(current));
if (display->access.allowed_task)
snprintf(allowed_task, sizeof (allowed_task), "%s[%d]" ,
display->access.allowed_task->comm,
task_pid_vnr(display->access.allowed_task));
drm_dbg_kms(display->drm,
"Reject display access from task %s (allowed to %s)\n" ,
current_task, allowed_task);
return false ;
}
/* part #2: call after irq install, but before gem init */
int intel_display_driver_probe_nogem(struct intel_display *display)
{
enum pipe pipe;
int ret;
if (!HAS_DISPLAY(display))
return 0 ;
intel_wm_init(display);
intel_panel_sanitize_ssc(display);
intel_pps_setup(display);
intel_gmbus_setup(display);
drm_dbg_kms(display->drm, "%d display pipe%s available.\n" ,
INTEL_NUM_PIPES(display),
INTEL_NUM_PIPES(display) > 1 ? "s" : "" );
for_each_pipe(display, pipe) {
ret = intel_crtc_init(display, pipe);
if (ret)
goto err_mode_config;
}
intel_plane_possible_crtcs_init(display);
intel_dpll_init(display);
intel_fdi_pll_freq_update(display);
intel_update_czclk(display);
intel_display_driver_init_hw(display);
intel_dpll_update_ref_clks(display);
if (display->cdclk.max_cdclk_freq == 0 )
intel_update_max_cdclk(display);
intel_hti_init(display);
intel_setup_outputs(display);
ret = intel_dp_tunnel_mgr_init(display);
if (ret)
goto err_hdcp;
intel_display_driver_disable_user_access(display);
drm_modeset_lock_all(display->drm);
intel_modeset_setup_hw_state(display, display->drm->mode_config.acquire_ctx);
intel_acpi_assign_connector_fwnodes(display);
drm_modeset_unlock_all(display->drm);
intel_initial_plane_config(display);
/*
* Make sure hardware watermarks really match the state we read out .
* Note that we need to do this after reconstructing the BIOS fb ' s
* since the watermark calculation done here will use pstate - > fb .
*/
if (!HAS_GMCH(display))
ilk_wm_sanitize(display);
return 0 ;
err_hdcp:
intel_hdcp_component_fini(display);
err_mode_config:
intel_mode_config_cleanup(display);
return ret;
}
/* part #3: call after gem init */
int intel_display_driver_probe(struct intel_display *display)
{
int ret;
if (!HAS_DISPLAY(display))
return 0 ;
/*
* This will bind stuff into ggtt , so it needs to be done after
* the BIOS fb takeover and whatever else magic ggtt reservations
* happen during gem / ggtt init .
*/
intel_hdcp_component_init(display);
intel_flipq_init(display);
/*
* Force all active planes to recompute their states . So that on
* mode_setcrtc after probe , all the intel_plane_state variables
* are already calculated and there is no assert_plane warnings
* during bootup .
*/
ret = intel_initial_commit(display);
if (ret)
drm_dbg_kms(display->drm, "Initial modeset failed, %d\n" , ret);
intel_overlay_setup(display);
/* Only enable hotplug handling once the fbdev is fully set up. */
intel_hpd_init(display);
skl_watermark_ipc_init(display);
return 0 ;
}
void intel_display_driver_register(struct intel_display *display)
{
struct drm_printer p = drm_dbg_printer(display->drm, DRM_UT_KMS,
"i915 display info:" );
if (!HAS_DISPLAY(display))
return ;
/* Must be done after probing outputs */
intel_opregion_register(display);
intel_acpi_video_register(display);
intel_audio_init(display);
intel_display_driver_enable_user_access(display);
intel_audio_register(display);
intel_display_debugfs_register(display);
/*
* We need to coordinate the hotplugs with the asynchronous
* fbdev configuration , for which we use the
* fbdev - > async_cookie .
*/
drm_kms_helper_poll_init(display->drm);
intel_hpd_poll_disable(display);
intel_fbdev_setup(display);
intel_display_device_info_print(DISPLAY_INFO(display),
DISPLAY_RUNTIME_INFO(display), &p);
intel_register_dsm_handler();
}
/* part #1: call before irq uninstall */
void intel_display_driver_remove(struct intel_display *display)
{
if (!HAS_DISPLAY(display))
return ;
flush_workqueue(display->wq.flip);
flush_workqueue(display->wq.modeset);
flush_workqueue(display->wq.cleanup);
flush_workqueue(display->wq.unordered);
/*
* MST topology needs to be suspended so we don ' t have any calls to
* fbdev after it ' s finalized . MST will be destroyed later as part of
* drm_mode_config_cleanup ( )
*/
intel_dp_mst_suspend(display);
}
/* part #2: call after irq uninstall */
void intel_display_driver_remove_noirq(struct intel_display *display)
{
if (!HAS_DISPLAY(display))
return ;
intel_display_driver_suspend_access(display);
/*
* Due to the hpd irq storm handling the hotplug work can re - arm the
* poll handlers . Hence disable polling after hpd handling is shut down .
*/
intel_hpd_poll_fini(display);
intel_unregister_dsm_handler();
/* flush any delayed tasks or pending work */
flush_workqueue(display->wq.unordered);
intel_hdcp_component_fini(display);
intel_mode_config_cleanup(display);
intel_dp_tunnel_mgr_cleanup(display);
intel_overlay_cleanup(display);
intel_gmbus_teardown(display);
destroy_workqueue(display->hotplug.dp_wq);
destroy_workqueue(display->wq.flip);
destroy_workqueue(display->wq.modeset);
destroy_workqueue(display->wq.cleanup);
destroy_workqueue(display->wq.unordered);
intel_fbc_cleanup(display);
}
/* part #3: call after gem init */
void intel_display_driver_remove_nogem(struct intel_display *display)
{
intel_dmc_fini(display);
intel_power_domains_driver_remove(display);
intel_vga_unregister(display);
intel_bios_driver_remove(display);
}
void intel_display_driver_unregister(struct intel_display *display)
{
if (!HAS_DISPLAY(display))
return ;
intel_unregister_dsm_handler();
drm_client_dev_unregister(display->drm);
/*
* After flushing the fbdev ( incl . a late async config which
* will have delayed queuing of a hotplug event ) , then flush
* the hotplug events .
*/
drm_kms_helper_poll_fini(display->drm);
intel_display_driver_disable_user_access(display);
intel_audio_deinit(display);
drm_atomic_helper_shutdown(display->drm);
acpi_video_unregister();
intel_opregion_unregister(display);
}
/*
* turn all crtc ' s off , but do not adjust state
* This has to be paired with a call to intel_modeset_setup_hw_state .
*/
int intel_display_driver_suspend(struct intel_display *display)
{
struct drm_atomic_state *state;
int ret;
if (!HAS_DISPLAY(display))
return 0 ;
state = drm_atomic_helper_suspend(display->drm);
ret = PTR_ERR_OR_ZERO(state);
if (ret)
drm_err(display->drm, "Suspending crtc's failed with %i\n" ,
ret);
else
display->restore.modeset_state = state;
/* ensure all DPT VMAs have been unpinned for intel_dpt_suspend() */
flush_workqueue(display->wq.cleanup);
intel_dp_mst_suspend(display);
return ret;
}
int
__intel_display_driver_resume(struct intel_display *display,
struct drm_atomic_state *state,
struct drm_modeset_acquire_ctx *ctx)
{
struct drm_crtc_state *crtc_state;
struct drm_crtc *crtc;
int ret, i;
intel_modeset_setup_hw_state(display, ctx);
if (!state)
return 0 ;
/*
* We ' ve duplicated the state , pointers to the old state are invalid .
*
* Don ' t attempt to use the old state until we commit the duplicated state .
*/
for_each_new_crtc_in_state(state, crtc, crtc_state, i) {
/*
* Force recalculation even if we restore
* current state . With fast modeset this may not result
* in a modeset when the state is compatible .
*/
crtc_state->mode_changed = true ;
}
/* ignore any reset values/BIOS leftovers in the WM registers */
if (!HAS_GMCH(display))
to_intel_atomic_state(state)->skip_intermediate_wm = true ;
ret = drm_atomic_helper_commit_duplicated_state(state, ctx);
drm_WARN_ON(display->drm, ret == -EDEADLK);
return ret;
}
void intel_display_driver_resume(struct intel_display *display)
{
struct drm_atomic_state *state = display->restore.modeset_state;
struct drm_modeset_acquire_ctx ctx;
int ret;
if (!HAS_DISPLAY(display))
return ;
/* MST sideband requires HPD interrupts enabled */
intel_dp_mst_resume(display);
display->restore.modeset_state = NULL;
if (state)
state->acquire_ctx = &ctx;
drm_modeset_acquire_init(&ctx, 0 );
while (1 ) {
ret = drm_modeset_lock_all_ctx(display->drm, &ctx);
if (ret != -EDEADLK)
break ;
drm_modeset_backoff(&ctx);
}
if (!ret)
ret = __intel_display_driver_resume(display, state, &ctx);
skl_watermark_ipc_update(display);
drm_modeset_drop_locks(&ctx);
drm_modeset_acquire_fini(&ctx);
if (ret)
drm_err(display->drm,
"Restoring old state failed with %i\n" , ret);
if (state)
drm_atomic_state_put(state);
}
Messung V0.5 in Prozent C=96 H=93 G=94
¤ Dauer der Verarbeitung: 0.10 Sekunden
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*© Formatika GbR, Deutschland
2026-10-11
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