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drm/i915: Report the failure to write to the punit

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The write to the punit may fail, so propagate the error code back to its
callers. Of particular interest are the RPS writes, so add appropriate
user error codes and logging.

v2: Add DEBUG for failed frequency changes during RPS.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170126101919.13211-1-chris@chris-wilson.co.uk
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
This commit is contained in:
Chris Wilson
2017-01-26 10:19:19 +00:00
parent 611032bfa7
commit 9fcee2f77e
6 changed files with 53 additions and 26 deletions
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5
drivers/gpu/drm/i915/i915_irq.c
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@@ -1209,7 +1209,10 @@ static void gen6_pm_rps_work(struct work_struct *work)
new_delay += adj;
new_delay = clamp_t(int, new_delay, min, max);
intel_set_rps(dev_priv, new_delay);
if (intel_set_rps(dev_priv, new_delay)) {
DRM_DEBUG_DRIVER("Failed to set new GPU frequency\n");
dev_priv->rps.last_adj = 0;
}
mutex_unlock(&dev_priv->rps.hw_lock);
}