drm/i915: Exit early from psr_status if PSR is not supported by the device

Static analysis was complaining that a path existed where we could use
stat[] uninitialized. Fix this by simplifying the logic to exit early if
PSR isn't supported.

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index f293caf..74bc89b 100644 (file)
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2234,6 +2234,11 @@ static int i915_edp_psr_status(struct seq_file *m, void *data)
        enum pipe pipe;
        bool enabled = false;
 
+       if (!HAS_PSR(dev)) {
+               seq_puts(m, "PSR not supported\n");
+               return 0;
+       }
+
        intel_runtime_pm_get(dev_priv);
 
        mutex_lock(&dev_priv->psr.lock);
@@ -2246,17 +2251,15 @@ static int i915_edp_psr_status(struct seq_file *m, void *data)
        seq_printf(m, "Re-enable work scheduled: %s\n",
                   yesno(work_busy(&dev_priv->psr.work.work)));
 
-       if (HAS_PSR(dev)) {
-               if (HAS_DDI(dev))
-                       enabled = I915_READ(EDP_PSR_CTL(dev)) & EDP_PSR_ENABLE;
-               else {
-                       for_each_pipe(dev_priv, pipe) {
-                               stat[pipe] = I915_READ(VLV_PSRSTAT(pipe)) &
-                                       VLV_EDP_PSR_CURR_STATE_MASK;
-                               if ((stat[pipe] == VLV_EDP_PSR_ACTIVE_NORFB_UP) ||
-                                   (stat[pipe] == VLV_EDP_PSR_ACTIVE_SF_UPDATE))
-                                       enabled = true;
-                       }
+       if (HAS_DDI(dev))
+               enabled = I915_READ(EDP_PSR_CTL(dev)) & EDP_PSR_ENABLE;
+       else {
+               for_each_pipe(dev_priv, pipe) {
+                       stat[pipe] = I915_READ(VLV_PSRSTAT(pipe)) &
+                               VLV_EDP_PSR_CURR_STATE_MASK;
+                       if ((stat[pipe] == VLV_EDP_PSR_ACTIVE_NORFB_UP) ||
+                           (stat[pipe] == VLV_EDP_PSR_ACTIVE_SF_UPDATE))
+                               enabled = true;
                }
        }
        seq_printf(m, "HW Enabled & Active bit: %s", yesno(enabled));
@@ -2273,7 +2276,7 @@ static int i915_edp_psr_status(struct seq_file *m, void *data)
                   yesno((bool)dev_priv->psr.link_standby));
 
        /* CHV PSR has no kind of performance counter */
-       if (HAS_PSR(dev) && HAS_DDI(dev)) {
+       if (HAS_DDI(dev)) {
                psrperf = I915_READ(EDP_PSR_PERF_CNT(dev)) &
                        EDP_PSR_PERF_CNT_MASK;