From 01fe13aa28273e8886b51415ae2fca8c95c3fddd Mon Sep 17 00:00:00 2001
From: Noah Abradjian <noah.abradjian@amd.com>
Date: Fri, 22 Nov 2019 16:07:24 -0500
Subject: drm/amd/display: Collapse resource arrays when pipe is disabled
Git-commit: b9f1246df179522bc28fda50b720553c845863db
Patch-mainline: v5.6-rc1
References: jsc#SLE-12680, jsc#SLE-12880, jsc#SLE-12882, jsc#SLE-12883, jsc#SLE-13496, jsc#SLE-15322

[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>
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 .../drm/amd/display/dc/dcn21/dcn21_resource.c | 20 +++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

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 2f91a016b913..052d2867c823 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;
-- 
2.28.0