[Intel-gfx] [PATCH v3] drm/i915/skl: Implement the skl version of MMIO flips

[Damien Lespiau]

Because the plane registers are different in Skylake we need to adapt
the MMIO code as well.

v2: Don't introduce yet another vfunc when the direction is do
consolidate the plane updates to use the same code path (Daniel)

v3:
  - Use enum pipe instead of int (Ville)
  - Also update PLANE_STRIDE when the tiling has changed (Ville)
  - Put intel_mark_page_flip_active() in the shared code (Damien)

Signed-off-by: Damien Lespiau <damien.lespiau at intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 55 ++++++++++++++++++++++++++++++++++--
 1 file changed, 52 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 6d35484..e94a132 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -9252,7 +9252,41 @@ static bool use_mmio_flip(struct intel_engine_cs *ring,
 		return ring != obj->ring;
 }
 
-static void intel_do_mmio_flip(struct intel_crtc *intel_crtc)
+static void skl_do_mmio_flip(struct intel_crtc *intel_crtc)
+{
+       struct drm_device *dev = intel_crtc->base.dev;
+       struct drm_i915_private *dev_priv = dev->dev_private;
+       struct drm_framebuffer *fb = intel_crtc->base.primary->fb;
+       struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
+       struct drm_i915_gem_object *obj = intel_fb->obj;
+       const enum pipe pipe = intel_crtc->pipe;
+       u32 ctl, stride;
+
+       ctl = I915_READ(PLANE_CTL(pipe, 0));
+       ctl &= ~PLANE_CTL_TILED_MASK;
+       if (obj->tiling_mode == I915_TILING_X)
+               ctl |= PLANE_CTL_TILED_X;
+
+	/*
+	 * The stride is either expressed as a multiple of 64 bytes chunks for
+	 * linear buffers or in number of tiles for tiled buffers.
+	 */
+       stride = fb->pitches[0] >> 6;
+       if (obj->tiling_mode == I915_TILING_X)
+		stride = fb->pitches[0] >> 9; /* X tiles are 512 bytes wide */
+
+	/*
+	 * Both PLANE_CTL and PLANE_STRIDE are not updated on vblank but on
+	 * PLANE_SURF updates, the update is then guaranteed to be atomic.
+	 */
+       I915_WRITE(PLANE_CTL(pipe, 0), ctl);
+       I915_WRITE(PLANE_STRIDE(pipe, 0), stride);
+
+       I915_WRITE(PLANE_SURF(pipe, 0), intel_crtc->unpin_work->gtt_offset);
+       POSTING_READ(PLANE_SURF(pipe, 0));
+}
+
+static void ilk_do_mmio_flip(struct intel_crtc *intel_crtc)
 {
 	struct drm_device *dev = intel_crtc->base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -9262,8 +9296,6 @@ static void intel_do_mmio_flip(struct intel_crtc *intel_crtc)
 	u32 dspcntr;
 	u32 reg;
 
-	intel_mark_page_flip_active(intel_crtc);
-
 	reg = DSPCNTR(intel_crtc->plane);
 	dspcntr = I915_READ(reg);
 
@@ -9279,6 +9311,23 @@ static void intel_do_mmio_flip(struct intel_crtc *intel_crtc)
 	POSTING_READ(DSPSURF(intel_crtc->plane));
 }
 
+/*
+ * XXX: This is the temporary way to update the plane registers until we get
+ * around to using the usual plane update functions for MMIO flips
+ */
+static void intel_do_mmio_flip(struct intel_crtc *intel_crtc)
+{
+	struct drm_device *dev = intel_crtc->base.dev;
+
+	intel_mark_page_flip_active(intel_crtc);
+
+	if (INTEL_INFO(dev)->gen >= 9)
+		skl_do_mmio_flip(intel_crtc);
+	else
+		/* use_mmio_flip() retricts MMIO flips to ilk+ */
+		ilk_do_mmio_flip(intel_crtc);
+}
+
 static int intel_postpone_flip(struct drm_i915_gem_object *obj)
 {
 	struct intel_engine_cs *ring;
-- 
1.8.3.1