drm/xe/guc_pc: Use poll_timeout_us() for waiting

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Convert wait_for_pc_state() and wait_for_act_freq_limit() to
poll_timeout_us(). This brings 2 changes in behavior: Drop the
exponential wait and fix a potential much longer sleep.

usleep_range() will wait anywhere between `wait` and `wait << 1`, so
it's not correct to assume `slept += wait`.  This code is not really
accurate. Pairing this with the exponential wait increase, it could be
waiting much longer than intended.

Reviewed-by: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
Link: https://lore.kernel.org/r/20250922-xe-iopoll-v4-2-06438311a63f@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>

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Lucas De Marchi 2025-09-22 12:58:30 -07:00

parent 09ab20c41a

commit b0ac4ef074

1 changed files with 13 additions and 31 deletions

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drivers/gpu/drm/xe/xe_guc_pc.c

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