[PATCH] drm/xe/display: Add intel_plane_initial_vblank_wait

[Maarten Lankhorst]

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 <maarten.lankhorst at linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241105121857.17389-2-maarten.lankhorst@linux.intel.com
Signed-off-by: Maarten Lankhorst,,, <dev at lankhorst.se>
---
 drivers/gpu/drm/i915/display/intel_display.c  |  6 +++---
 .../drm/i915/display/intel_plane_initial.c    |  9 ++++++++-
 .../drm/i915/display/intel_plane_initial.h    |  2 ++
 drivers/gpu/drm/xe/display/xe_plane_initial.c | 19 ++++++++++++++++++-
 4 files changed, 31 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index d7f92dc56d1e9..7bd6da2bb36f7 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -795,7 +795,7 @@ 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(plane);
 	}
 
 	/*
@@ -809,7 +809,7 @@ 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(plane);
 
 	/*
 	 * Gen2 reports pipe underruns whenever all planes are disabled.
@@ -819,7 +819,7 @@ 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(plane);
 }
 
 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 62401f6a04e4f..77eb2b763be5e 100644
--- a/drivers/gpu/drm/i915/display/intel_plane_initial.c
+++ b/drivers/gpu/drm/i915/display/intel_plane_initial.c
@@ -14,6 +14,13 @@
 #include "intel_frontbuffer.h"
 #include "intel_plane_initial.h"
 
+void intel_plane_initial_vblank_wait(struct intel_plane *plane)
+{
+	struct intel_crtc *crtc = intel_crtc_for_pipe(to_intel_display(plane->base.dev), plane->pipe);
+
+	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[],
@@ -438,7 +445,7 @@ void intel_initial_plane_config(struct drm_i915_private *i915)
 		intel_find_initial_plane_obj(crtc, plane_configs);
 
 		if (i915->display.funcs.display->fixup_initial_plane_config(crtc, plane_config))
-			intel_crtc_wait_for_next_vblank(crtc);
+			intel_plane_initial_vblank_wait(to_intel_plane(crtc->base.primary));
 
 		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 64ab95239cd45..149b1bf1bc1f8 100644
--- a/drivers/gpu/drm/i915/display/intel_plane_initial.h
+++ b/drivers/gpu/drm/i915/display/intel_plane_initial.h
@@ -7,7 +7,9 @@
 #define __INTEL_PLANE_INITIAL_H__
 
 struct drm_i915_private;
+struct intel_plane;
 
+void intel_plane_initial_vblank_wait(struct intel_plane *plane);
 void intel_initial_plane_config(struct drm_i915_private *i915);
 
 #endif
diff --git a/drivers/gpu/drm/xe/display/xe_plane_initial.c b/drivers/gpu/drm/xe/display/xe_plane_initial.c
index 668f544a7ac80..9252cfeef0a1f 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_plane *plane)
+{
+	/* Early xe has no irq */
+	struct xe_device *xe = to_xe_device(plane->base.dev);
+	struct xe_reg pipe_frmtmstmp = XE_REG(i915_mmio_reg_offset(PIPE_FRMTMSTMP(plane->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[],
@@ -293,7 +310,7 @@ void intel_initial_plane_config(struct drm_i915_private *i915)
 		intel_find_initial_plane_obj(crtc, plane_configs);
 
 		if (i915->display.funcs.display->fixup_initial_plane_config(crtc, plane_config))
-			intel_crtc_wait_for_next_vblank(crtc);
+			intel_plane_initial_vblank_wait(to_intel_plane(crtc->base.primary));
 
 		plane_config_fini(plane_config);
 	}
-- 
2.45.2