We need to block DC6 entry in case of Panel Replay as enabling VBI doesn't prevent DC6 in case of Panel Replay. This causes problems if user-space is polling for vblank events. Fix this by setting target DC state as DC_STATE_EN_UPTO_DC5 when both source and sink are supporting eDP Panel Replay and VBI is enabled. v2: - use READ_ONCE in intel_display_vblank_work - use DC_STATE_DISABLE instead of DC_STATE_EN_UPTO_DC6 - use intel_crtc->block_dc6_needed Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2296 Signed-off-by: Jouni Högander <jouni.hogander@xxxxxxxxx> --- .../gpu/drm/i915/display/intel_display_core.h | 2 ++ .../gpu/drm/i915/display/intel_display_irq.c | 28 +++++++++++++++++++ 2 files changed, 30 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_display_core.h b/drivers/gpu/drm/i915/display/intel_display_core.h index 0a711114ff2b4..0707bc2047931 100644 --- a/drivers/gpu/drm/i915/display/intel_display_core.h +++ b/drivers/gpu/drm/i915/display/intel_display_core.h @@ -457,6 +457,8 @@ struct intel_display { /* For i915gm/i945gm vblank irq workaround */ u8 vblank_enabled; + struct work_struct vblank_work; + u32 de_irq_mask[I915_MAX_PIPES]; u32 pipestat_irq_mask[I915_MAX_PIPES]; } irq; diff --git a/drivers/gpu/drm/i915/display/intel_display_irq.c b/drivers/gpu/drm/i915/display/intel_display_irq.c index 8f13f148c73e3..4bdc67e1baa31 100644 --- a/drivers/gpu/drm/i915/display/intel_display_irq.c +++ b/drivers/gpu/drm/i915/display/intel_display_irq.c @@ -1361,16 +1361,38 @@ static bool gen11_dsi_configure_te(struct intel_crtc *intel_crtc, return true; } +static void intel_display_vblank_work(struct work_struct *work) +{ + struct intel_display *display = + container_of(work, typeof(*display), irq.vblank_work); + struct drm_i915_private *i915 = to_i915(display->drm); + u8 vblank_enabled = READ_ONCE(display->irq.vblank_enabled); + + /* + * NOTE: intel_display_power_set_target_dc_state is used only by PSR + * code for DC3CO handling. DC3CO target state is currently disabled in + * PSR code. If DC3CO is taken into use we need take that into account + * here as well. + */ + intel_display_power_set_target_dc_state(i915, vblank_enabled ? DC_STATE_DISABLE : + DC_STATE_EN_UPTO_DC6); +} + int bdw_enable_vblank(struct drm_crtc *_crtc) { struct intel_crtc *crtc = to_intel_crtc(_crtc); + struct intel_display *display = to_intel_display(crtc); struct drm_i915_private *dev_priv = to_i915(crtc->base.dev); enum pipe pipe = crtc->pipe; unsigned long irqflags; + u8 block_dc6_needed = READ_ONCE(crtc->block_dc6_needed); if (gen11_dsi_configure_te(crtc, true)) return 0; + if (display->irq.vblank_enabled++ == 0 && block_dc6_needed) + schedule_work(&display->irq.vblank_work); + spin_lock_irqsave(&dev_priv->irq_lock, irqflags); bdw_enable_pipe_irq(dev_priv, pipe, GEN8_PIPE_VBLANK); spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags); @@ -1436,6 +1458,7 @@ void ilk_disable_vblank(struct drm_crtc *crtc) void bdw_disable_vblank(struct drm_crtc *_crtc) { struct intel_crtc *crtc = to_intel_crtc(_crtc); + struct intel_display *display = to_intel_display(crtc); struct drm_i915_private *dev_priv = to_i915(crtc->base.dev); enum pipe pipe = crtc->pipe; unsigned long irqflags; @@ -1446,6 +1469,9 @@ void bdw_disable_vblank(struct drm_crtc *_crtc) spin_lock_irqsave(&dev_priv->irq_lock, irqflags); bdw_disable_pipe_irq(dev_priv, pipe, GEN8_PIPE_VBLANK); spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags); + + if (--display->irq.vblank_enabled == 0) + schedule_work(&display->irq.vblank_work); } void vlv_display_irq_reset(struct drm_i915_private *dev_priv) @@ -1871,4 +1897,6 @@ void intel_display_irq_init(struct drm_i915_private *i915) i915->display.irq.display_irqs_enabled = false; intel_hotplug_irq_init(i915); + + INIT_WORK(&i915->display.irq.vblank_work, intel_display_vblank_work); } -- 2.34.1
