[Intel-gfx] [PATCH 1/3] drm/i915/display/skl+: Drop frontbuffer rendering support

["José Roberto de Souza" <jose.souza@intel.com>]

By now all the userspace applications should have migrated to atomic
or at least be calling DRM_IOCTL_MODE_DIRTYFB.

With that we can kill frontbuffer rendering support in i915 for
modern platforms.

So here converting legacy APIs into atomic commits so it can be
properly handled by driver i915.

Several IGT tests will fail with this changes, because some tests
were stressing those frontbuffer rendering scenarios that no userspace
should be using by now, fixes to IGT should be sent soon.

Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
---
 drivers/gpu/drm/i915/display/intel_cursor.c      | 6 ++----
 drivers/gpu/drm/i915/display/intel_display.c     | 7 ++++++-
 drivers/gpu/drm/i915/display/intel_frontbuffer.c | 6 ++++++
 drivers/gpu/drm/i915/i915_drv.h                  | 2 ++
 4 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_cursor.c b/drivers/gpu/drm/i915/display/intel_cursor.c
index c7618fef01439..5aa996c3b7980 100644
--- a/drivers/gpu/drm/i915/display/intel_cursor.c
+++ b/drivers/gpu/drm/i915/display/intel_cursor.c
@@ -617,6 +617,7 @@ intel_legacy_cursor_update(struct drm_plane *_plane,
 			   u32 src_w, u32 src_h,
 			   struct drm_modeset_acquire_ctx *ctx)
 {
+	struct drm_i915_private *i915 = to_i915(_crtc->dev);
 	struct intel_plane *plane = to_intel_plane(_plane);
 	struct intel_crtc *crtc = to_intel_crtc(_crtc);
 	struct intel_plane_state *old_plane_state =
@@ -633,12 +634,9 @@ intel_legacy_cursor_update(struct drm_plane *_plane,
 	 * PSR2 selective fetch also requires the slow path as
 	 * PSR2 plane and transcoder registers can only be updated during
 	 * vblank.
-	 *
-	 * FIXME bigjoiner fastpath would be good
 	 */
 	if (!crtc_state->hw.active || intel_crtc_needs_modeset(crtc_state) ||
-	    crtc_state->update_pipe || crtc_state->bigjoiner ||
-	    crtc_state->enable_psr2_sel_fetch)
+	    crtc_state->update_pipe || !HAS_FRONTBUFFER_RENDERING(i915))
 		goto slow;
 
 	/*
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index a257e5dc381c6..90fd0d5e87778 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -11742,10 +11742,15 @@ static int intel_user_framebuffer_dirty(struct drm_framebuffer *fb,
 					unsigned num_clips)
 {
 	struct drm_i915_gem_object *obj = intel_fb_obj(fb);
+	struct drm_i915_private *i915 = to_i915(obj->base.dev);
 
 	i915_gem_object_flush_if_display(obj);
-	intel_frontbuffer_flush(to_intel_frontbuffer(fb), ORIGIN_DIRTYFB);
 
+	if (!HAS_FRONTBUFFER_RENDERING(i915))
+		return drm_atomic_helper_dirtyfb(fb, file, flags, color, clips,
+						 num_clips);
+
+	intel_frontbuffer_flush(to_intel_frontbuffer(fb), ORIGIN_DIRTYFB);
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/i915/display/intel_frontbuffer.c b/drivers/gpu/drm/i915/display/intel_frontbuffer.c
index 8e75debcce1a9..8bae2db721ef9 100644
--- a/drivers/gpu/drm/i915/display/intel_frontbuffer.c
+++ b/drivers/gpu/drm/i915/display/intel_frontbuffer.c
@@ -90,6 +90,9 @@ static void frontbuffer_flush(struct drm_i915_private *i915,
 
 	trace_intel_frontbuffer_flush(frontbuffer_bits, origin);
 
+	if (!HAS_FRONTBUFFER_RENDERING(i915))
+		return;
+
 	might_sleep();
 	intel_edp_drrs_flush(i915, frontbuffer_bits);
 	intel_psr_flush(i915, frontbuffer_bits, origin);
@@ -178,6 +181,9 @@ void __intel_fb_invalidate(struct intel_frontbuffer *front,
 
 	trace_intel_frontbuffer_invalidate(frontbuffer_bits, origin);
 
+	if (!HAS_FRONTBUFFER_RENDERING(i915))
+		return;
+
 	might_sleep();
 	intel_psr_invalidate(i915, frontbuffer_bits, origin);
 	intel_edp_drrs_invalidate(i915, frontbuffer_bits);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 005b1cec70075..41e3a421efcec 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1721,6 +1721,8 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 
 #define HAS_VRR(i915)	(GRAPHICS_VER(i915) >= 12)
 
+#define HAS_FRONTBUFFER_RENDERING(i915)	(GRAPHICS_VER(i915) < 9)
+
 /* Only valid when HAS_DISPLAY() is true */
 #define INTEL_DISPLAY_ENABLED(dev_priv) \
 	(drm_WARN_ON(&(dev_priv)->drm, !HAS_DISPLAY(dev_priv)), !(dev_priv)->params.disable_display)
-- 
2.32.0