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/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index a04d81a..bec4283 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4933,7 +4933,7 @@
/* gen6_set_rps is called to update the frequency request, but should also be
* called when the range (min_delay and max_delay) is modified so that we can
* update the GEN6_RP_INTERRUPT_LIMITS register accordingly. */
-static void gen6_set_rps(struct drm_i915_private *dev_priv, u8 val)
+static int gen6_set_rps(struct drm_i915_private *dev_priv, u8 val)
{
WARN_ON(!mutex_is_locked(&dev_priv->rps.hw_lock));
WARN_ON(val > dev_priv->rps.max_freq);
@@ -4968,10 +4968,14 @@
dev_priv->rps.cur_freq = val;
trace_intel_gpu_freq_change(intel_gpu_freq(dev_priv, val));
+
+ return 0;
}
-static void valleyview_set_rps(struct drm_i915_private *dev_priv, u8 val)
+static int valleyview_set_rps(struct drm_i915_private *dev_priv, u8 val)
{
+ int err;
+
WARN_ON(!mutex_is_locked(&dev_priv->rps.hw_lock));
WARN_ON(val > dev_priv->rps.max_freq);
WARN_ON(val < dev_priv->rps.min_freq);
@@ -4983,13 +4987,18 @@
I915_WRITE(GEN6_PMINTRMSK, gen6_rps_pm_mask(dev_priv, val));
if (val != dev_priv->rps.cur_freq) {
- vlv_punit_write(dev_priv, PUNIT_REG_GPU_FREQ_REQ, val);
+ err = vlv_punit_write(dev_priv, PUNIT_REG_GPU_FREQ_REQ, val);
+ if (err)
+ return err;
+
if (!IS_CHERRYVIEW(dev_priv))
gen6_set_rps_thresholds(dev_priv, val);
}
dev_priv->rps.cur_freq = val;
trace_intel_gpu_freq_change(intel_gpu_freq(dev_priv, val));
+
+ return 0;
}
/* vlv_set_rps_idle: Set the frequency to idle, if Gfx clocks are down
@@ -5002,6 +5011,7 @@
static void vlv_set_rps_idle(struct drm_i915_private *dev_priv)
{
u32 val = dev_priv->rps.idle_freq;
+ int err;
if (dev_priv->rps.cur_freq <= val)
return;
@@ -5019,8 +5029,11 @@
* power than the render powerwell.
*/
intel_uncore_forcewake_get(dev_priv, FORCEWAKE_MEDIA);
- valleyview_set_rps(dev_priv, val);
+ err = valleyview_set_rps(dev_priv, val);
intel_uncore_forcewake_put(dev_priv, FORCEWAKE_MEDIA);
+
+ if (err)
+ DRM_ERROR("Failed to set RPS for idle\n");
}
void gen6_rps_busy(struct drm_i915_private *dev_priv)
@@ -5035,10 +5048,11 @@
gen6_enable_rps_interrupts(dev_priv);
/* Ensure we start at the user's desired frequency */
- intel_set_rps(dev_priv,
- clamp(dev_priv->rps.cur_freq,
- dev_priv->rps.min_freq_softlimit,
- dev_priv->rps.max_freq_softlimit));
+ if (intel_set_rps(dev_priv,
+ clamp(dev_priv->rps.cur_freq,
+ dev_priv->rps.min_freq_softlimit,
+ dev_priv->rps.max_freq_softlimit)))
+ DRM_DEBUG_DRIVER("Failed to set idle frequency\n");
}
mutex_unlock(&dev_priv->rps.hw_lock);
}
@@ -5106,12 +5120,16 @@
spin_unlock(&dev_priv->rps.client_lock);
}
-void intel_set_rps(struct drm_i915_private *dev_priv, u8 val)
+int intel_set_rps(struct drm_i915_private *dev_priv, u8 val)
{
+ int err;
+
if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
- valleyview_set_rps(dev_priv, val);
+ err = valleyview_set_rps(dev_priv, val);
else
- gen6_set_rps(dev_priv, val);
+ err = gen6_set_rps(dev_priv, val);
+
+ return err;
}
static void gen9_disable_rc6(struct drm_i915_private *dev_priv)
@@ -5315,7 +5333,7 @@
}
static void reset_rps(struct drm_i915_private *dev_priv,
- void (*set)(struct drm_i915_private *, u8))
+ int (*set)(struct drm_i915_private *, u8))
{
u8 freq = dev_priv->rps.cur_freq;
@@ -5323,7 +5341,8 @@
dev_priv->rps.power = -1;
dev_priv->rps.cur_freq = -1;
- set(dev_priv, freq);
+ if (set(dev_priv, freq))
+ DRM_ERROR("Failed to reset RPS to initial values\n");
}
/* See the Gen9_GT_PM_Programming_Guide doc for the below */