[Intel-gfx] [PATCH v2 08/19] drm/i915/dsb: Introduce intel_dsb_noop()

[Ville Syrjala]

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

Add a helper for emitting a number of DSB NOOPs commands.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_dsb.c | 9 +++++++++
 drivers/gpu/drm/i915/display/intel_dsb.h | 1 +
 2 files changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_dsb.c b/drivers/gpu/drm/i915/display/intel_dsb.c
index 22c716ee75e2..4ef799c087b4 100644
--- a/drivers/gpu/drm/i915/display/intel_dsb.c
+++ b/drivers/gpu/drm/i915/display/intel_dsb.c
@@ -234,6 +234,15 @@ void intel_dsb_reg_write(struct intel_dsb *dsb,
 	}
 }
 
+void intel_dsb_noop(struct intel_dsb *dsb, int count)
+{
+	int i;
+
+	for (i = 0; i < count; i++)
+		intel_dsb_emit(dsb, 0,
+			       DSB_OPCODE_NOOP << DSB_OPCODE_SHIFT);
+}
+
 static void intel_dsb_align_tail(struct intel_dsb *dsb)
 {
 	u32 aligned_tail, tail;
diff --git a/drivers/gpu/drm/i915/display/intel_dsb.h b/drivers/gpu/drm/i915/display/intel_dsb.h
index b8148b47022d..5a08bc21beda 100644
--- a/drivers/gpu/drm/i915/display/intel_dsb.h
+++ b/drivers/gpu/drm/i915/display/intel_dsb.h
@@ -19,6 +19,7 @@ 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);
+void intel_dsb_noop(struct intel_dsb *dsb, int count);
 void intel_dsb_commit(struct intel_dsb *dsb,
 		      bool wait_for_vblank);
 void intel_dsb_wait(struct intel_dsb *dsb);
-- 
2.39.3