drm/i915: Set adjustment to zero on Up/Down interrupts if freq is already max/min

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When we reach the user's RPS limits, stop requesting an adjustment. Even
though we will clamp the requested frequency later, we rely on interrupt
masking to disable further adjustments in the same direction. Even
though it is unlikely (one scenario is a bug in the driver, another is
careful manipulation through the uAPI) if we keep exponentially
increasing the adjustment value, it will wrap and cause a negative
adjustment.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1484884104-28134-2-git-send-email-sagar.a.kamble@intel.com

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Sagar Arun Kamble 2017-01-20 09:18:24 +05:30 • committed by Chris Wilson

parent e96128235b

commit 7e79a6836c

1 changed files with 6 additions and 0 deletions

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drivers/gpu/drm/i915/i915_irq.c

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