drm/i915/dsb: Pass DSB engine ID to intel_dsb_prepare()

Allow the caller of intel_dsb_prepare() to determine which DSB
engine (out of the three possible per pipe) to use. This will
let us utilize multiple DSB engines during the same commit.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240531114101.19994-4-ville.syrjala@linux.intel.comReviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/i915/display/intel_color.c

@@ -1914,7 +1914,7 @@ void intel_color_prepare_commit(struct intel_crtc_state *crtc_state)
 	if (!crtc_state->pre_csc_lut && !crtc_state->post_csc_lut)
 		return;
 
-	crtc_state->dsb = intel_dsb_prepare(crtc_state, 1024);
+	crtc_state->dsb = intel_dsb_prepare(crtc_state, INTEL_DSB_0, 1024);
 	if (!crtc_state->dsb)
 		return;
 

drivers/gpu/drm/i915/display/intel_dsb.c

@@ -435,6 +435,7 @@ void intel_dsb_wait(struct intel_dsb *dsb)
 /**
  * intel_dsb_prepare() - Allocate, pin and map the DSB command buffer.
  * @crtc_state: the CRTC state
+ * @dsb_id: the DSB engine to use
  * @max_cmds: number of commands we need to fit into command buffer
  *
  * This function prepare the command buffer which is used to store dsb
@@ -444,6 +445,7 @@ void intel_dsb_wait(struct intel_dsb *dsb)
  * DSB context, NULL on failure
  */
 struct intel_dsb *intel_dsb_prepare(const struct intel_crtc_state *crtc_state,
+				    enum intel_dsb_id dsb_id,
 				    unsigned int max_cmds)
 {
 	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
@@ -473,7 +475,7 @@ struct intel_dsb *intel_dsb_prepare(const struct intel_crtc_state *crtc_state,
 
 	intel_runtime_pm_put(&i915->runtime_pm, wakeref);
 
-	dsb->id = INTEL_DSB_0;
+	dsb->id = dsb_id;
 	dsb->crtc = crtc;
 	dsb->size = size / 4; /* in dwords */
 	dsb->free_pos = 0;
@@ -488,7 +490,7 @@ struct intel_dsb *intel_dsb_prepare(const struct intel_crtc_state *crtc_state,
 out:
 	drm_info_once(&i915->drm,
 		      "[CRTC:%d:%s] DSB %d queue setup failed, will fallback to MMIO for display HW programming\n",
-		      crtc->base.base.id, crtc->base.name, INTEL_DSB_0);
+		      crtc->base.base.id, crtc->base.name, dsb_id);
 
 	return NULL;
 }

drivers/gpu/drm/i915/display/intel_dsb.h

@@ -23,6 +23,7 @@ enum intel_dsb_id {
 };
 
 struct intel_dsb *intel_dsb_prepare(const struct intel_crtc_state *crtc_state,
+				    enum intel_dsb_id dsb_id,
 				    unsigned int max_cmds);
 void intel_dsb_finish(struct intel_dsb *dsb);
 void intel_dsb_cleanup(struct intel_dsb *dsb);