From: Roman Li <Roman.Li@amd.com>
Date: Thu, 3 May 2018 13:29:42 -0400
Subject: drm/amd/display: replace msleep with udelay in fbc path
Git-commit: 2b6199a1d1b70fccd62aed961ba4c2b979ae499c
Patch-mainline: v4.18-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

FBC enabling and disabling path has msleep which leads to
BUG hit when called in atomic context, hence this patch
replaces msleeps with udelays appropriately.

Signed-off-by: Shirish S <shirish.s@amd.com>
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>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/display/dc/dce110/dce110_compressor.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_compressor.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_compressor.c
@@ -121,10 +121,10 @@ static void reset_lb_on_vblank(struct dc
 		frame_count = dm_read_reg(ctx, mmCRTC_STATUS_FRAME_COUNT);
 
 
-		for (retry = 100; retry > 0; retry--) {
+		for (retry = 10000; retry > 0; retry--) {
 			if (frame_count != dm_read_reg(ctx, mmCRTC_STATUS_FRAME_COUNT))
 				break;
-			msleep(1);
+			udelay(10);
 		}
 		if (!retry)
 			dm_error("Frame count did not increase for 100ms.\n");
@@ -147,14 +147,14 @@ static void wait_for_fbc_state_changed(
 	uint32_t addr = mmFBC_STATUS;
 	uint32_t value;
 
-	while (counter < 10) {
+	while (counter < 1000) {
 		value = dm_read_reg(cp110->base.ctx, addr);
 		if (get_reg_field_value(
 			value,
 			FBC_STATUS,
 			FBC_ENABLE_STATUS) == enabled)
 			break;
-		msleep(10);
+		udelay(100);
 		counter++;
 	}