[PATCH v3 1/2] drm/i915/display: Add block_dc6_needed variable into intel_crtc

[Jouni Högander]

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. For this purpose add new block_dc6_needed
variable into intel_crtc. Check if eDP Panel Replay is possible and set the
variable accordingly.

v3: check that encoder is dp
v2: set/clear block_dc6_needed in intel_crtc_vblank_on/off

Signed-off-by: Jouni Högander <jouni.hogander at intel.com>
---
 drivers/gpu/drm/i915/display/intel_crtc.c       | 17 +++++++++++++++++
 .../gpu/drm/i915/display/intel_display_types.h  |  7 +++++++
 drivers/gpu/drm/i915/display/intel_psr.c        |  1 +
 3 files changed, 25 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_crtc.c b/drivers/gpu/drm/i915/display/intel_crtc.c
index aed3853952be8..34a60b5b1e55b 100644
--- a/drivers/gpu/drm/i915/display/intel_crtc.c
+++ b/drivers/gpu/drm/i915/display/intel_crtc.c
@@ -24,6 +24,7 @@
 #include "intel_display_irq.h"
 #include "intel_display_trace.h"
 #include "intel_display_types.h"
+#include "intel_dp.h"
 #include "intel_drrs.h"
 #include "intel_dsi.h"
 #include "intel_fifo_underrun.h"
@@ -123,6 +124,20 @@ u32 intel_crtc_max_vblank_count(const struct intel_crtc_state *crtc_state)
 void intel_crtc_vblank_on(const struct intel_crtc_state *crtc_state)
 {
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	struct intel_encoder *encoder;
+
+	for_each_encoder_on_crtc(crtc->base.dev, &crtc->base, encoder) {
+		struct intel_dp *intel_dp;
+
+		if (!intel_encoder_is_dp(encoder))
+			continue;
+
+		intel_dp = enc_to_intel_dp(encoder);
+
+		if (intel_dp_is_edp(intel_dp) &&
+		    CAN_PANEL_REPLAY(intel_dp))
+			crtc->block_dc6_needed = true;
+	}
 
 	assert_vblank_disabled(&crtc->base);
 	drm_crtc_set_max_vblank_count(&crtc->base,
@@ -150,6 +165,8 @@ 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_dc6_needed = false;
 }
 
 struct intel_crtc_state *intel_crtc_state_alloc(struct intel_crtc *crtc)
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 000ab373c8879..df0c3eb750809 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1413,6 +1413,13 @@ struct intel_crtc {
 #ifdef CONFIG_DEBUG_FS
 	struct intel_pipe_crc pipe_crc;
 #endif
+
+	/*
+	 * 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.
+	 */
+	u8 block_dc6_needed;
 };
 
 struct intel_plane {
diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 4f29ac32ff85b..957f470b08fe8 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -35,6 +35,7 @@
 #include "intel_cursor_regs.h"
 #include "intel_ddi.h"
 #include "intel_de.h"
+#include "intel_display_irq.h"
 #include "intel_display_types.h"
 #include "intel_dp.h"
 #include "intel_dp_aux.h"
-- 
2.34.1