From 59d3191f14dc18881fec1172c7096b7863622803 Mon Sep 17 00:00:00 2001
From: Harry Wentland <harry.wentland@amd.com>
Date: Wed, 30 Jan 2019 15:45:18 -0500
Subject: drm/amd/display: don't call dm_pp_ function from an fpu block
Git-commit: 59d3191f14dc18881fec1172c7096b7863622803
Patch-mainline: v5.1-rc1
References: bsc#1113956
Powerplay functions called from dm_pp_* functions tend to do a
mutex_lock which isn't safe to do inside a kernel_fpu_begin/end block as
those will disable/enable preemption.
Rearrange the dm_pp_get_clock_levels_by_type_with_voltage calls to make
sure they happen outside of kernel_fpu_begin/end.
Cc: stable@vger.kernel.org
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c b/drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c
index 12d1842079ae..eb62d10bb65c 100644
--- a/drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c
+++ b/drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c
@@ -1348,12 +1348,12 @@ void dcn_bw_update_from_pplib(struct dc *dc)
struct dm_pp_clock_levels_with_voltage fclks = {0}, dcfclks = {0};
bool res;
- kernel_fpu_begin();
-
/* TODO: This is not the proper way to obtain fabric_and_dram_bandwidth, should be min(fclk, memclk) */
res = dm_pp_get_clock_levels_by_type_with_voltage(
ctx, DM_PP_CLOCK_TYPE_FCLK, &fclks);
+ kernel_fpu_begin();
+
if (res)
res = verify_clock_values(&fclks);
@@ -1372,9 +1372,13 @@ void dcn_bw_update_from_pplib(struct dc *dc)
} else
BREAK_TO_DEBUGGER();
+ kernel_fpu_end();
+
res = dm_pp_get_clock_levels_by_type_with_voltage(
ctx, DM_PP_CLOCK_TYPE_DCFCLK, &dcfclks);
+ kernel_fpu_begin();
+
if (res)
res = verify_clock_values(&dcfclks);
--
2.21.0