From: Ken Chalmers <ken.chalmers@amd.com>
Date: Wed, 27 Jun 2018 12:48:21 -0400
Subject: drm/amd/display: Fix new stream count check in dc_add_stream_to_ctx
Git-commit: ece4147fea152fe0761d67b825fb4b4b9f94349b
Patch-mainline: v4.19-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

[Why]
The previous code could allow through attempts to enable more streams
than there are timing generators, in designs where the number of pipes
is greater than the number of timing generators.

[How]
Compare the new stream count to the resource pool's timing generator
count, instead of its pipe count.  Also correct a typo in the error
message.

Signed-off-by: Ken Chalmers <ken.chalmers@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_resource.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -1705,8 +1705,8 @@ enum dc_status dc_add_stream_to_ctx(
 	struct dc_context *dc_ctx = dc->ctx;
 	enum dc_status res;
 
-	if (new_ctx->stream_count >= dc->res_pool->pipe_count) {
-		DC_ERROR("Max streams reached, can add stream %p !\n", stream);
+	if (new_ctx->stream_count >= dc->res_pool->timing_generator_count) {
+		DC_ERROR("Max streams reached, can't add stream %p !\n", stream);
 		return DC_ERROR_UNEXPECTED;
 	}