From: Noah Abradjian <noah.abradjian@amd.com>
Date: Fri, 22 Nov 2019 21:07:24 +0000 (-0500)
Subject: drm/amd/display: Collapse resource arrays when pipe is disabled
X-Git-Tag: v5.10.7~3266^2~16^2~162
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b9f1246df179522bc28fda50b720553c845863db;p=platform%2Fkernel%2Flinux-rpi.git

drm/amd/display: Collapse resource arrays when pipe is disabled

[Why]
Currently, pipe resources are assigned to an index that matches the pipe position.
However, if pipe 1 or 2 is disabled, there will be a gap in the arrays which causes a crash when iterating based on pipe_count.

[How]
Fix resource construct to assign resources to minimum available array index.

Signed-off-by: Noah Abradjian <noah.abradjian@amd.com>
Reviewed-by: Yongqiang Sun <yongqiang.sun@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c b/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
index 2f91a01..052d286 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn21/dcn21_resource.c
@@ -1783,41 +1783,41 @@ static bool dcn21_resource_construct(
 		if ((pipe_fuses & (1 << i)) != 0)
 			continue;
 
-		pool->base.hubps[i] = dcn21_hubp_create(ctx, i);
-		if (pool->base.hubps[i] == NULL) {
+		pool->base.hubps[j] = dcn21_hubp_create(ctx, i);
+		if (pool->base.hubps[j] == NULL) {
 			BREAK_TO_DEBUGGER();
 			dm_error(
 				"DC: failed to create memory input!\n");
 			goto create_fail;
 		}
 
-		pool->base.ipps[i] = dcn21_ipp_create(ctx, i);
-		if (pool->base.ipps[i] == NULL) {
+		pool->base.ipps[j] = dcn21_ipp_create(ctx, i);
+		if (pool->base.ipps[j] == NULL) {
 			BREAK_TO_DEBUGGER();
 			dm_error(
 				"DC: failed to create input pixel processor!\n");
 			goto create_fail;
 		}
 
-		pool->base.dpps[i] = dcn21_dpp_create(ctx, i);
-		if (pool->base.dpps[i] == NULL) {
+		pool->base.dpps[j] = dcn21_dpp_create(ctx, i);
+		if (pool->base.dpps[j] == NULL) {
 			BREAK_TO_DEBUGGER();
 			dm_error(
 				"DC: failed to create dpps!\n");
 			goto create_fail;
 		}
 
-		pool->base.opps[i] = dcn21_opp_create(ctx, i);
-		if (pool->base.opps[i] == NULL) {
+		pool->base.opps[j] = dcn21_opp_create(ctx, i);
+		if (pool->base.opps[j] == NULL) {
 			BREAK_TO_DEBUGGER();
 			dm_error(
 				"DC: failed to create output pixel processor!\n");
 			goto create_fail;
 		}
 
-		pool->base.timing_generators[i] = dcn21_timing_generator_create(
+		pool->base.timing_generators[j] = dcn21_timing_generator_create(
 				ctx, i);
-		if (pool->base.timing_generators[i] == NULL) {
+		if (pool->base.timing_generators[j] == NULL) {
 			BREAK_TO_DEBUGGER();
 			dm_error("DC: failed to create tg!\n");
 			goto create_fail;