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drm/amd/display: don't call dm_pp_ function from an fpu block

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commit 59d3191f14dc18881fec1172c7096b7863622803 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Harry Wentland 2019-01-30 15:45:18 -05:00 committed by Greg Kroah-Hartman
parent 17982c6a64
commit 585715ef18
1 changed files with 6 additions and 2 deletions
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8
drivers/gpu/drm/amd/display/dc/calcs/dcn_calcs.c
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@ -1347,12 +1347,12 @@ 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);
@ -1371,9 +1371,13 @@ 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);