[PATCH for 6.1 2/2] drm/amdgpu: clarify DC checks
From: Rosen Penev
Date: Fri Feb 27 2026 - 20:15:14 EST
From: Alex Deucher <alexander.deucher@xxxxxxx>
[ Upstream commit d09ef243035b75a6d403ebfeb7e87fa20d7e25c6 ]
There are several places where we don't want to check
if a particular asic could support DC, but rather, if
DC is enabled. Set a flag if DC is enabled and check
for that rather than if a device supports DC or not.
Acked-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 +
drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c | 2 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c | 2 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 32 ++++++++++---------
drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 4 +--
drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 2 +-
.../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 1 +
.../gpu/drm/amd/pm/powerplay/amd_powerplay.c | 2 +-
8 files changed, 25 insertions(+), 21 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index dcb5de01a220..c4287e09658f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1071,6 +1071,7 @@ struct amdgpu_device {
struct work_struct reset_work;
bool job_hang;
+ bool dc_enabled;
};
static inline struct amdgpu_device *drm_to_adev(struct drm_device *ddev)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
index 5fa7f6d8aa30..9ced0c60ec8b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
@@ -857,7 +857,7 @@ int amdgpu_acpi_init(struct amdgpu_device *adev)
struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
if (atif->notifications.brightness_change) {
- if (amdgpu_device_has_dc_support(adev)) {
+ if (adev->dc_enabled) {
#if defined(CONFIG_DRM_AMD_DC)
struct amdgpu_display_manager *dm = &adev->dm;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
index 3cca3f07f34d..11bfbf1d6a3d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
@@ -1981,7 +1981,7 @@ int amdgpu_debugfs_init(struct amdgpu_device *adev)
amdgpu_ta_if_debugfs_init(adev);
#if defined(CONFIG_DRM_AMD_DC)
- if (amdgpu_device_has_dc_support(adev))
+ if (adev->dc_enabled)
dtn_debugfs_init(adev);
#endif
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 535cc74c5880..a43f18defa7a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -4402,25 +4402,27 @@ int amdgpu_device_resume(struct drm_device *dev, bool fbcon)
amdgpu_ras_resume(adev);
- /*
- * Most of the connector probing functions try to acquire runtime pm
- * refs to ensure that the GPU is powered on when connector polling is
- * performed. Since we're calling this from a runtime PM callback,
- * trying to acquire rpm refs will cause us to deadlock.
- *
- * Since we're guaranteed to be holding the rpm lock, it's safe to
- * temporarily disable the rpm helpers so this doesn't deadlock us.
- */
+ if (adev->mode_info.num_crtc) {
+ /*
+ * Most of the connector probing functions try to acquire runtime pm
+ * refs to ensure that the GPU is powered on when connector polling is
+ * performed. Since we're calling this from a runtime PM callback,
+ * trying to acquire rpm refs will cause us to deadlock.
+ *
+ * Since we're guaranteed to be holding the rpm lock, it's safe to
+ * temporarily disable the rpm helpers so this doesn't deadlock us.
+ */
#ifdef CONFIG_PM
- dev->dev->power.disable_depth++;
+ dev->dev->power.disable_depth++;
#endif
- if (!amdgpu_device_has_dc_support(adev))
- drm_helper_hpd_irq_event(dev);
- else
- drm_kms_helper_hotplug_event(dev);
+ if (!adev->dc_enabled)
+ drm_helper_hpd_irq_event(dev);
+ else
+ drm_kms_helper_hotplug_event(dev);
#ifdef CONFIG_PM
- dev->dev->power.disable_depth--;
+ dev->dev->power.disable_depth--;
#endif
+ }
adev->in_suspend = false;
if (adev->enable_mes)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
index 98cce09684f2..f9692e724409 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
@@ -534,7 +534,7 @@ uint32_t amdgpu_display_supported_domains(struct amdgpu_device *adev,
*/
if ((bo_flags & AMDGPU_GEM_CREATE_CPU_GTT_USWC) &&
amdgpu_bo_support_uswc(bo_flags) &&
- amdgpu_device_has_dc_support(adev) &&
+ adev->dc_enabled &&
adev->mode_info.gpu_vm_support)
domain |= AMDGPU_GEM_DOMAIN_GTT;
#endif
@@ -1330,7 +1330,7 @@ int amdgpu_display_modeset_create_props(struct amdgpu_device *adev)
"dither",
amdgpu_dither_enum_list, sz);
- if (amdgpu_device_has_dc_support(adev)) {
+ if (adev->dc_enabled) {
adev->mode_info.abm_level_property =
drm_property_create_range(adev_to_drm(adev), 0,
"abm level", 0, 4);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 055e05b2cb22..3c01bb464248 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -2530,7 +2530,7 @@ static int amdgpu_runtime_idle_check_display(struct device *dev)
if (ret)
return ret;
- if (amdgpu_device_has_dc_support(adev)) {
+ if (adev->dc_enabled) {
struct drm_crtc *crtc;
drm_for_each_crtc(crtc, drm_dev) {
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index f7fbc7932bb5..0d41a13c9019 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -4842,6 +4842,7 @@ static int dm_early_init(void *handle)
adev_to_drm(adev)->dev,
&dev_attr_s3_debug);
#endif
+ adev->dc_enabled = true;
return 0;
}
diff --git a/drivers/gpu/drm/amd/pm/powerplay/amd_powerplay.c b/drivers/gpu/drm/amd/pm/powerplay/amd_powerplay.c
index ab8ae7464664..9bf85ca607c3 100644
--- a/drivers/gpu/drm/amd/pm/powerplay/amd_powerplay.c
+++ b/drivers/gpu/drm/amd/pm/powerplay/amd_powerplay.c
@@ -1567,7 +1567,7 @@ static void pp_pm_compute_clocks(void *handle)
struct pp_hwmgr *hwmgr = handle;
struct amdgpu_device *adev = hwmgr->adev;
- if (!amdgpu_device_has_dc_support(adev)) {
+ if (!adev->dc_enabled) {
amdgpu_dpm_get_active_displays(adev);
adev->pm.pm_display_cfg.num_display = adev->pm.dpm.new_active_crtc_count;
adev->pm.pm_display_cfg.vrefresh = amdgpu_dpm_get_vrefresh(adev);
--
2.53.0