drm/i915: Report the failure to write to the punit
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>
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 0a39487..3ae0656 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -4278,7 +4278,8 @@ i915_max_freq_set(void *data, u64 val)
dev_priv->rps.max_freq_softlimit = val;
- intel_set_rps(dev_priv, val);
+ if (intel_set_rps(dev_priv, val))
+ DRM_DEBUG_DRIVER("failed to update RPS to new softlimit\n");
mutex_unlock(&dev_priv->rps.hw_lock);
@@ -4333,7 +4334,8 @@ i915_min_freq_set(void *data, u64 val)
dev_priv->rps.min_freq_softlimit = val;
- intel_set_rps(dev_priv, val);
+ if (intel_set_rps(dev_priv, val))
+ DRM_DEBUG_DRIVER("failed to update RPS to new softlimit\n");
mutex_unlock(&dev_priv->rps.hw_lock);