drm/amd/display: Move the memory allocation out of dcn20_validate_bandwidth_fp().

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dcn20_validate_bandwidth_fp() is invoked while FPU access has been
enabled. FPU access requires disabling preemption even on PREEMPT_RT.
It is not possible to allocate memory with disabled preemption even with
GFP_ATOMIC on PREEMPT_RT.

Move the memory allocation before FPU access is enabled.
To preserve previous "clean" state of "pipes" add a memset() before the
second invocation of dcn20_validate_bandwidth_internal() where the
variable is used.

Acked-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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Sebastian Andrzej Siewior 2023-09-21 16:15:16 +02:00 • committed by Alex Deucher

parent 941e8036a4

commit 2091ac6903

3 changed files with 18 additions and 13 deletions

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10

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c

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16

drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.c

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5

drivers/gpu/drm/amd/display/dc/dml/dcn20/dcn20_fpu.h

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