[PATCH 04/13] drm/i915/dsb: Introduce intel_dsb_finish()

[Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx>]

From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>

Introduce a function to emits whatever commands we need
at the end of the DSB command buffer. For the moment we
only do the tail cacheline alignment there, but eventually
we might want eg. emit an interrupt.

Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/i915/display/intel_color.c |  1 +
 drivers/gpu/drm/i915/display/intel_dsb.c   | 11 +++++++----
 drivers/gpu/drm/i915/display/intel_dsb.h   |  1 +
 3 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_color.c b/drivers/gpu/drm/i915/display/intel_color.c
index 5d99913429b9..6d6d300fa2df 100644
--- a/drivers/gpu/drm/i915/display/intel_color.c
+++ b/drivers/gpu/drm/i915/display/intel_color.c
@@ -1257,6 +1257,7 @@ static void icl_load_luts(const struct intel_crtc_state *crtc_state)
 	}
 
 	if (crtc_state->dsb) {
+		intel_dsb_finish(crtc_state->dsb);
 		intel_dsb_commit(crtc_state->dsb);
 		intel_dsb_wait(crtc_state->dsb);
 	}
diff --git a/drivers/gpu/drm/i915/display/intel_dsb.c b/drivers/gpu/drm/i915/display/intel_dsb.c
index 0b2faa33f204..9e25b1345927 100644
--- a/drivers/gpu/drm/i915/display/intel_dsb.c
+++ b/drivers/gpu/drm/i915/display/intel_dsb.c
@@ -199,7 +199,7 @@ void intel_dsb_reg_write(struct intel_dsb *dsb,
 	}
 }
 
-static u32 intel_dsb_align_tail(struct intel_dsb *dsb)
+static void intel_dsb_align_tail(struct intel_dsb *dsb)
 {
 	u32 aligned_tail, tail;
 
@@ -211,8 +211,11 @@ static u32 intel_dsb_align_tail(struct intel_dsb *dsb)
 		       aligned_tail - tail);
 
 	dsb->free_pos = aligned_tail / 4;
+}
 
-	return aligned_tail;
+void intel_dsb_finish(struct intel_dsb *dsb)
+{
+	intel_dsb_align_tail(dsb);
 }
 
 /**
@@ -228,8 +231,8 @@ void intel_dsb_commit(struct intel_dsb *dsb)
 	enum pipe pipe = crtc->pipe;
 	u32 tail;
 
-	tail = intel_dsb_align_tail(dsb);
-	if (tail == 0)
+	tail = dsb->free_pos * 4;
+	if (drm_WARN_ON(&dev_priv->drm, !IS_ALIGNED(tail, CACHELINE_BYTES)))
 		return;
 
 	if (is_dsb_busy(dev_priv, pipe, dsb->id)) {
diff --git a/drivers/gpu/drm/i915/display/intel_dsb.h b/drivers/gpu/drm/i915/display/intel_dsb.h
index 7999199c2464..6b22499e8a5d 100644
--- a/drivers/gpu/drm/i915/display/intel_dsb.h
+++ b/drivers/gpu/drm/i915/display/intel_dsb.h
@@ -15,6 +15,7 @@ struct intel_dsb;
 
 struct intel_dsb *intel_dsb_prepare(struct intel_crtc *crtc,
 				    unsigned int max_cmds);
+void intel_dsb_finish(struct intel_dsb *dsb);
 void intel_dsb_cleanup(struct intel_dsb *dsb);
 void intel_dsb_reg_write(struct intel_dsb *dsb,
 			 i915_reg_t reg, u32 val);
-- 
2.38.2