drm/xe/mmio: Fix xe_mmio_wait32() to honor delay/sleep maximums

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Check for overflow in udelay use in __xe_mmio_wait32 and
avoid growing delays becoming intollerably large by capping the
in-loop wait time.

v7: - Change assisted-by to "LLM" (Rodrigo).
    - Move the max-wait macro to outside the function (Rodrigo).
v6: - Fix commit message to remove items dropped in v5. Fix the
      use of MAX_UDELAY_MS for microsecond unit. (Shasiko review).
v5: - Simplify: don't introduce additional redesign and
      use min_t with a backoff to cap wait. (Rodrigo).
v4: - Simplify using poll_timeout_us and poll_timeout_us_atomic and
      update all callers to never use a param for atomic (Jani)
v3: - Use div64_s64 kernel API for 32-bit vs 64-bit division.
v2: - Fixed checkpatch failure.
    - Added helper for 64-bit DIV_ROUND_UP on 32-bit CPU (Shasiko
      review). Fixed bug max range in usleep_range(Shasiko review)

Fixes: 5c09bd6ccd ("drm/xe/mmio: Move xe_mmio_wait32() to xe_mmio.c")
Signed-off-by: Alan Previn <alan.previn.teres.alexis@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Assisted-by: LLM
Link: https://patch.msgid.link/20260929192037.2233429-2-alan.previn.teres.alexis@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
(cherry picked from commit 70dab9ee7d)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

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Alan Previn 2026-09-29 12:20:37 -07:00 • committed by Rodrigo Vivi

parent a90ee4305c

commit e7ed652b13

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drivers/gpu/drm/xe/xe_mmio.c

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