[PATCH v4 2/2] drm/i915/display: Prevent DC6 while vblank is enabled for Panel Replay
Jouni Högander
jouni.hogander at intel.com
Thu Sep 19 12:37:25 UTC 2024
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.
v3:
- do flush_work for vblank_work on intel_crtc_vblank_off
- no need to use READ_ONCE in bdw_enable_vblank
- check crtc->block_dc_for_vblank in bdw_disable_vblank as well
- move adding block_dc_for_vblank into this patch
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 at intel.com>
---
drivers/gpu/drm/i915/display/intel_crtc.c | 7 +++++
.../gpu/drm/i915/display/intel_display_core.h | 2 ++
.../gpu/drm/i915/display/intel_display_irq.c | 27 +++++++++++++++++++
.../drm/i915/display/intel_display_types.h | 2 ++
4 files changed, 38 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_crtc.c b/drivers/gpu/drm/i915/display/intel_crtc.c
index f95d169fc324a..315d3f1230846 100644
--- a/drivers/gpu/drm/i915/display/intel_crtc.c
+++ b/drivers/gpu/drm/i915/display/intel_crtc.c
@@ -124,6 +124,8 @@ void intel_crtc_vblank_on(const struct intel_crtc_state *crtc_state)
{
struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+ crtc->block_dc_for_vblank = intel_psr_needs_block_dc_vblank(crtc_state);
+
assert_vblank_disabled(&crtc->base);
drm_crtc_set_max_vblank_count(&crtc->base,
intel_crtc_max_vblank_count(crtc_state));
@@ -140,6 +142,7 @@ void intel_crtc_vblank_on(const struct intel_crtc_state *crtc_state)
void intel_crtc_vblank_off(const struct intel_crtc_state *crtc_state)
{
struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+ struct intel_display *display = to_intel_display(crtc);
/*
* Should really happen exactly when we disable the pipe
@@ -150,6 +153,10 @@ void intel_crtc_vblank_off(const struct intel_crtc_state *crtc_state)
drm_crtc_vblank_off(&crtc->base);
assert_vblank_disabled(&crtc->base);
+
+ crtc->block_dc_for_vblank = false;
+
+ flush_work(&display->irq.vblank_work);
}
struct intel_crtc_state *intel_crtc_state_alloc(struct intel_crtc *crtc)
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 b830756124c32..03428f92abd82 100644
--- a/drivers/gpu/drm/i915/display/intel_display_irq.c
+++ b/drivers/gpu/drm/i915/display/intel_display_irq.c
@@ -1361,9 +1361,27 @@ 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;
@@ -1371,6 +1389,9 @@ int bdw_enable_vblank(struct drm_crtc *_crtc)
if (gen11_dsi_configure_te(crtc, true))
return 0;
+ if (display->irq.vblank_enabled++ == 0 && crtc->block_dc_for_vblank)
+ 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 +1457,7 @@ 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 +1468,9 @@ 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 && crtc->block_dc_for_vblank)
+ schedule_work(&display->irq.vblank_work);
}
void vlv_display_irq_reset(struct drm_i915_private *dev_priv)
@@ -1882,4 +1907,6 @@ 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);
}
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 000ab373c8879..245c1381b455f 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1413,6 +1413,8 @@ struct intel_crtc {
#ifdef CONFIG_DEBUG_FS
struct intel_pipe_crc pipe_crc;
#endif
+
+ u8 block_dc_for_vblank;
};
struct intel_plane {
--
2.34.1
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