disp: msm: add api to get active status of hw blocks

This change introduces new ctl path api read_active_status to check
if a particular hw block is active or not in the current control path.
This is specially required in continuous splash use case when bootloader
has programmed certain blocks and the kernel driver tries to find
out the same configuration. This is used to ascertain which DSC block
is active in continuous splash case since DSC blocks are not tied to
mixer blocks.

Change-Id: I8dd590aa2dc764bd340727c166e1133ef9ce7af5
Signed-off-by: Abhijit Kulkarni <kabhijit@codeaurora.org>

msm/sde/sde_rm.c

@@ -1264,11 +1264,6 @@ static int _sde_rm_reserve_dsc(
 		bool has_422_420_support =
 			BIT(SDE_DSC_NATIVE_422_EN) & features;
 
-		SDE_DEBUG("blk id = %d, is_422_420_req:%d ,is_supported:%d\n",
-				iter_i.blk->id,
-				(dsc_info->config.native_422 ||
-				dsc_info->config.native_420),
-				has_422_420_support);
 		memset(&dsc, 0, sizeof(dsc));
 		alloc_count = 0;
 
@@ -1660,8 +1655,7 @@ static int _sde_rm_get_hw_blk_for_cont_splash(struct sde_rm *rm,
 		struct sde_splash_display *splash_display)
 {
 	u32 lm_reg;
-	struct sde_rm_hw_iter iter_lm, iter_pp;
-	struct sde_hw_pingpong *pp;
+	struct sde_rm_hw_iter iter_lm, iter_dsc;
 
 	if (!rm || !ctl || !splash_display) {
 		SDE_ERROR("invalid input parameters\n");
@@ -1669,10 +1663,8 @@ static int _sde_rm_get_hw_blk_for_cont_splash(struct sde_rm *rm,
 	}
 
 	sde_rm_init_hw_iter(&iter_lm, 0, SDE_HW_BLK_LM);
-	sde_rm_init_hw_iter(&iter_pp, 0, SDE_HW_BLK_PINGPONG);
+	sde_rm_init_hw_iter(&iter_dsc, 0, SDE_HW_BLK_DSC);
 	while (_sde_rm_get_hw_locked(rm, &iter_lm)) {
-		_sde_rm_get_hw_locked(rm, &iter_pp);
-
 		if (splash_display->lm_cnt >= MAX_DATA_PATH_PER_DSIPLAY)
 			break;
 
@@ -1695,16 +1687,20 @@ static int _sde_rm_get_hw_blk_for_cont_splash(struct sde_rm *rm,
 					iter_lm.blk->id - LM_0);
 			return 0;
 		}
+	}
 
-		pp = to_sde_hw_pingpong(iter_pp.blk->hw);
-		if (pp && pp->ops.get_dsc_status &&
-				pp->ops.get_dsc_status(pp)) {
-			splash_display->dsc_ids[splash_display->dsc_cnt++] =
-				iter_pp.blk->id;
-			SDE_DEBUG("lm/pp[%d] path, using dsc[%d]\n",
-					iter_lm.blk->id - LM_0,
-					iter_pp.blk->id - DSC_0);
-		}
+	while (_sde_rm_get_hw_locked(rm, &iter_dsc)) {
+		if (!ctl->ops.read_active_status &&
+				!(ctl->ops.read_active_status(ctl,
+					SDE_HW_BLK_DSC,
+					iter_dsc.blk->id)))
+			continue;
+
+		splash_display->dsc_ids[splash_display->dsc_cnt++] =
+				iter_dsc.blk->id;
+		SDE_DEBUG("CTL[%d] path, using dsc[%d]\n",
+				ctl->idx,
+				iter_dsc.blk->id - DSC_0);
 	}
 
 	return splash_display->lm_cnt;