From 66a0f6b9f5fc205272035b6ffa4830be51e3f787 Mon Sep 17 00:00:00 2001 From: Vinod Govindapillai Date: Fri, 23 Aug 2024 14:21:48 +0300 Subject: [PATCH] drm/xe/display: handle HPD polling in display runtime suspend/resume In XE, display runtime suspend / resume routines are called only if d3cold is allowed. This makes the driver unable to detect any HPDs once the device goes into runtime suspend state in platforms like LNL. Update the display runtime suspend / resume routines to include HPD polling regardless of d3cold status. While xe_display_pm_suspend/resume() performs steps during runtime suspend/resume that shouldn't happen, like suspending MST and they are missing other steps like enabling DC9, this patchset is meant to keep the current behavior wrt. these, leaving the corresponding updates for a follow-up v2: have a separate function for display runtime s/r (Rodrigo) v3: better streamlining of system s/r and runtime s/r calls (Imre) v4: rebased Reviewed-by: Arun R Murthy Signed-off-by: Vinod Govindapillai Link: https://patchwork.freedesktop.org/patch/msgid/20240823112148.327015-4-vinod.govindapillai@intel.com --- drivers/gpu/drm/xe/display/xe_display.c | 23 +++++++++++++++++++++++ drivers/gpu/drm/xe/display/xe_display.h | 4 ++++ drivers/gpu/drm/xe/xe_pm.c | 8 +++++--- 3 files changed, 32 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/xe/display/xe_display.c b/drivers/gpu/drm/xe/display/xe_display.c index 00dd38f6177b..710b1e2170c1 100644 --- a/drivers/gpu/drm/xe/display/xe_display.c +++ b/drivers/gpu/drm/xe/display/xe_display.c @@ -308,6 +308,18 @@ static void xe_display_flush_cleanup_work(struct xe_device *xe) } } +/* TODO: System and runtime suspend/resume sequences will be sanitized as a follow-up. */ +void xe_display_pm_runtime_suspend(struct xe_device *xe) +{ + if (!xe->info.probe_display) + return; + + if (xe->d3cold.allowed) + xe_display_pm_suspend(xe, true); + + intel_hpd_poll_enable(xe); +} + void xe_display_pm_suspend(struct xe_device *xe, bool runtime) { struct intel_display *display = &xe->display; @@ -354,6 +366,17 @@ void xe_display_pm_suspend_late(struct xe_device *xe) intel_display_power_suspend_late(xe); } +void xe_display_pm_runtime_resume(struct xe_device *xe) +{ + if (!xe->info.probe_display) + return; + + intel_hpd_poll_disable(xe); + + if (xe->d3cold.allowed) + xe_display_pm_resume(xe, true); +} + void xe_display_pm_resume_early(struct xe_device *xe) { if (!xe->info.probe_display) diff --git a/drivers/gpu/drm/xe/display/xe_display.h b/drivers/gpu/drm/xe/display/xe_display.h index 000fb5799df5..53d727fd792b 100644 --- a/drivers/gpu/drm/xe/display/xe_display.h +++ b/drivers/gpu/drm/xe/display/xe_display.h @@ -38,6 +38,8 @@ void xe_display_pm_suspend(struct xe_device *xe, bool runtime); void xe_display_pm_suspend_late(struct xe_device *xe); void xe_display_pm_resume_early(struct xe_device *xe); void xe_display_pm_resume(struct xe_device *xe, bool runtime); +void xe_display_pm_runtime_suspend(struct xe_device *xe); +void xe_display_pm_runtime_resume(struct xe_device *xe); #else @@ -67,6 +69,8 @@ static inline void xe_display_pm_suspend(struct xe_device *xe, bool runtime) {} static inline void xe_display_pm_suspend_late(struct xe_device *xe) {} static inline void xe_display_pm_resume_early(struct xe_device *xe) {} static inline void xe_display_pm_resume(struct xe_device *xe, bool runtime) {} +static inline void xe_display_pm_runtime_suspend(struct xe_device *xe) {} +static inline void xe_display_pm_runtime_resume(struct xe_device *xe) {} #endif /* CONFIG_DRM_XE_DISPLAY */ #endif /* _XE_DISPLAY_H_ */ diff --git a/drivers/gpu/drm/xe/xe_pm.c b/drivers/gpu/drm/xe/xe_pm.c index fcfb49af8c89..c247e1cb8aba 100644 --- a/drivers/gpu/drm/xe/xe_pm.c +++ b/drivers/gpu/drm/xe/xe_pm.c @@ -366,9 +366,9 @@ int xe_pm_runtime_suspend(struct xe_device *xe) xe_bo_runtime_pm_release_mmap_offset(bo); mutex_unlock(&xe->mem_access.vram_userfault.lock); - if (xe->d3cold.allowed) { - xe_display_pm_suspend(xe, true); + xe_display_pm_runtime_suspend(xe); + if (xe->d3cold.allowed) { err = xe_bo_evict_all(xe); if (err) goto out; @@ -431,12 +431,14 @@ int xe_pm_runtime_resume(struct xe_device *xe) for_each_gt(gt, xe, id) xe_gt_resume(gt); + xe_display_pm_runtime_resume(xe); + if (xe->d3cold.allowed) { - xe_display_pm_resume(xe, true); err = xe_bo_restore_user(xe); if (err) goto out; } + out: lock_map_release(&xe_pm_runtime_lockdep_map); xe_pm_write_callback_task(xe, NULL); -- 2.25.1