[PATCH 02/11] drm/i915/dsb: Extract assert_dsb_tail_is_aligned()

[Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>]

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

Extract the DSB tail alignment checks into helper. We already
have two uses of this, and soo we'll get a third.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_dsb.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dsb.c b/drivers/gpu/drm/i915/display/intel_dsb.c
index c166e02b8af0..08e3bbea1a67 100644
--- a/drivers/gpu/drm/i915/display/intel_dsb.c
+++ b/drivers/gpu/drm/i915/display/intel_dsb.c
@@ -204,6 +204,15 @@ static bool assert_dsb_has_room(struct intel_dsb *dsb)
 			 crtc->base.base.id, crtc->base.name, dsb->id);
 }
 
+static bool assert_dsb_tail_is_aligned(struct intel_dsb *dsb)
+{
+	struct intel_crtc *crtc = dsb->crtc;
+	struct intel_display *display = to_intel_display(crtc->base.dev);
+
+	return !drm_WARN_ON(display->drm,
+			    !IS_ALIGNED(dsb->free_pos * 4, CACHELINE_BYTES));
+}
+
 static void intel_dsb_dump(struct intel_dsb *dsb)
 {
 	struct intel_crtc *crtc = dsb->crtc;
@@ -621,10 +630,11 @@ static void _intel_dsb_chain(struct intel_atomic_state *state,
 	if (drm_WARN_ON(display->drm, dsb->id == chained_dsb->id))
 		return;
 
-	tail = chained_dsb->free_pos * 4;
-	if (drm_WARN_ON(display->drm, !IS_ALIGNED(tail, CACHELINE_BYTES)))
+	if (!assert_dsb_tail_is_aligned(chained_dsb))
 		return;
 
+	tail = chained_dsb->free_pos * 4;
+
 	intel_dsb_reg_write(dsb, DSB_CTRL(pipe, chained_dsb->id),
 			    ctrl | DSB_ENABLE);
 
@@ -695,10 +705,11 @@ static void _intel_dsb_commit(struct intel_dsb *dsb, u32 ctrl,
 	enum pipe pipe = crtc->pipe;
 	u32 tail;
 
-	tail = dsb->free_pos * 4;
-	if (drm_WARN_ON(display->drm, !IS_ALIGNED(tail, CACHELINE_BYTES)))
+	if (!assert_dsb_tail_is_aligned(dsb))
 		return;
 
+	tail = dsb->free_pos * 4;
+
 	if (is_dsb_busy(display, pipe, dsb->id)) {
 		drm_err(display->drm, "[CRTC:%d:%s] DSB %d is busy\n",
 			crtc->base.base.id, crtc->base.name, dsb->id);
-- 
2.25.1