From: Roman Li <Roman.Li@amd.com>
Date: Tue, 5 Jun 2018 18:24:53 +0000 (-0400)
Subject: drm/amd/display: fix potential infinite loop in fbc path
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=6f66ccf0aa8f6d430d161a1ac2bc43e665d2fc59;p=openwrt%2Fstaging%2Fblogic.git

drm/amd/display: fix potential infinite loop in fbc path

- Fixing integer overflow bug in wait_for_fbc_state_changed()
- Correct the max value of retries for the corresponding warning

Signed-off-by: Roman Li <Roman.Li@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_compressor.c b/drivers/gpu/drm/amd/display/dc/dce110/dce110_compressor.c
index df027013e50c..1f7f25013217 100644
--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_compressor.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_compressor.c
@@ -143,7 +143,7 @@ static void wait_for_fbc_state_changed(
 	struct dce110_compressor *cp110,
 	bool enabled)
 {
-	uint16_t counter = 0;
+	uint32_t counter = 0;
 	uint32_t addr = mmFBC_STATUS;
 	uint32_t value;
 
@@ -158,7 +158,7 @@ static void wait_for_fbc_state_changed(
 		counter++;
 	}
 
-	if (counter == 10) {
+	if (counter == 1000) {
 		DC_LOG_WARNING("%s: wait counter exceeded, changes to HW not applied",
 			__func__);
 	} else {