[PATCH 1/5] drm/xe/display: Add intel_plane_initial_vblank_wait

[Maarten Lankhorst <dev@lankhorst.se>]

We're changing the driver to have no interrupts during early init for
Xe, so we poll the PIPE_FRMSTMSMP counter instead.

Signed-off-by: Maarten Lankhorst <dev@lankhorst.se>
---
 drivers/gpu/drm/i915/display/intel_display.c  |  6 +++---
 .../drm/i915/display/intel_plane_initial.c    |  7 ++++++-
 .../drm/i915/display/intel_plane_initial.h    |  2 ++
 drivers/gpu/drm/xe/display/xe_plane_initial.c | 19 ++++++++++++++++++-
 4 files changed, 29 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 28c1b372cc954..079d1631c7893 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -796,7 +796,7 @@ void intel_plane_disable_noatomic(struct intel_crtc *crtc,
 	if ((crtc_state->active_planes & ~BIT(PLANE_CURSOR)) == 0 &&
 	    hsw_ips_disable(crtc_state)) {
 		crtc_state->ips_enabled = false;
-		intel_crtc_wait_for_next_vblank(crtc);
+		intel_plane_initial_vblank_wait(crtc);
 	}
 
 	/*
@@ -810,7 +810,7 @@ void intel_plane_disable_noatomic(struct intel_crtc *crtc,
 	 */
 	if (HAS_GMCH(dev_priv) &&
 	    intel_set_memory_cxsr(dev_priv, false))
-		intel_crtc_wait_for_next_vblank(crtc);
+		intel_plane_initial_vblank_wait(crtc);
 
 	/*
 	 * Gen2 reports pipe underruns whenever all planes are disabled.
@@ -820,7 +820,7 @@ void intel_plane_disable_noatomic(struct intel_crtc *crtc,
 		intel_set_cpu_fifo_underrun_reporting(dev_priv, crtc->pipe, false);
 
 	intel_plane_disable_arm(NULL, plane, crtc_state);
-	intel_crtc_wait_for_next_vblank(crtc);
+	intel_plane_initial_vblank_wait(crtc);
 }
 
 unsigned int
diff --git a/drivers/gpu/drm/i915/display/intel_plane_initial.c b/drivers/gpu/drm/i915/display/intel_plane_initial.c
index 6789b7f140952..b1675b46e06cb 100644
--- a/drivers/gpu/drm/i915/display/intel_plane_initial.c
+++ b/drivers/gpu/drm/i915/display/intel_plane_initial.c
@@ -14,6 +14,11 @@
 #include "intel_frontbuffer.h"
 #include "intel_plane_initial.h"
 
+void intel_plane_initial_vblank_wait(struct intel_crtc *crtc)
+{
+	intel_crtc_wait_for_next_vblank(crtc);
+}
+
 static bool
 intel_reuse_initial_plane_obj(struct intel_crtc *this,
 			      const struct intel_initial_plane_config plane_configs[],
@@ -442,7 +447,7 @@ void intel_initial_plane_config(struct intel_display *display)
 		intel_find_initial_plane_obj(crtc, plane_configs);
 
 		if (display->funcs.display->fixup_initial_plane_config(crtc, plane_config))
-			intel_crtc_wait_for_next_vblank(crtc);
+			intel_plane_initial_vblank_wait(crtc);
 
 		plane_config_fini(plane_config);
 	}
diff --git a/drivers/gpu/drm/i915/display/intel_plane_initial.h b/drivers/gpu/drm/i915/display/intel_plane_initial.h
index 6c6aa717ed21f..5c315acda2101 100644
--- a/drivers/gpu/drm/i915/display/intel_plane_initial.h
+++ b/drivers/gpu/drm/i915/display/intel_plane_initial.h
@@ -6,8 +6,10 @@
 #ifndef __INTEL_PLANE_INITIAL_H__
 #define __INTEL_PLANE_INITIAL_H__
 
+struct intel_crtc;
 struct intel_display;
 
 void intel_initial_plane_config(struct intel_display *display);
+void intel_plane_initial_vblank_wait(struct intel_crtc *crtc);
 
 #endif
diff --git a/drivers/gpu/drm/xe/display/xe_plane_initial.c b/drivers/gpu/drm/xe/display/xe_plane_initial.c
index 2eb9633f163a7..a22e7adfb09d9 100644
--- a/drivers/gpu/drm/xe/display/xe_plane_initial.c
+++ b/drivers/gpu/drm/xe/display/xe_plane_initial.c
@@ -8,7 +8,9 @@
 
 #include "regs/xe_gtt_defs.h"
 #include "xe_ggtt.h"
+#include "xe_mmio.h"
 
+#include "i915_reg.h"
 #include "intel_atomic_plane.h"
 #include "intel_crtc.h"
 #include "intel_display.h"
@@ -22,6 +24,21 @@
 
 #include <generated/xe_wa_oob.h>
 
+void intel_plane_initial_vblank_wait(struct intel_crtc *crtc)
+{
+	/* Early xe has no irq */
+	struct xe_device *xe = to_xe_device(crtc->base.dev);
+	struct xe_reg pipe_frmtmstmp = XE_REG(i915_mmio_reg_offset(PIPE_FRMTMSTMP(crtc->pipe)));
+	u32 timestamp;
+	int ret;
+
+	timestamp = xe_mmio_read32(xe_root_tile_mmio(xe), pipe_frmtmstmp);
+
+	ret = xe_mmio_wait32_not(xe_root_tile_mmio(xe), pipe_frmtmstmp, ~0U, timestamp, 40000U, &timestamp, false);
+	if (ret < 0)
+		drm_warn(&xe->drm, "waiting for early vblank failed with %i\n", ret);
+}
+
 static bool
 intel_reuse_initial_plane_obj(struct intel_crtc *this,
 			      const struct intel_initial_plane_config plane_configs[],
@@ -303,7 +320,7 @@ void intel_initial_plane_config(struct intel_display *display)
 		intel_find_initial_plane_obj(crtc, plane_configs);
 
 		if (display->funcs.display->fixup_initial_plane_config(crtc, plane_config))
-			intel_crtc_wait_for_next_vblank(crtc);
+			intel_plane_initial_vblank_wait(crtc);
 
 		plane_config_fini(plane_config);
 	}
-- 
2.45.2