Whenever DMC firmware put the HW into DC State a bunch
of registers including this perf counter is reset to 0 and
never restored.
So, even with PSR active and working we could still read
"Performance_Counter: 0" what will misslead people to believe
PSR is broken.
So, it is better to remove this counter information while
we don't have a better way to track PSR residency.
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_debugfs.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 038d5c6..71e1666 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2580,8 +2580,11 @@ static int i915_edp_psr_status(struct seq_file *m, void *data)
}
seq_puts(m, "\n");
- /* CHV PSR has no kind of performance counter */
- if (HAS_DDI(dev)) {
+ /*
+ * VLV/CHV PSR has no kind of performance counter
+ * SKL+ Perf counter is reset to 0 everytime DC state is entered
+ */
+ if (IS_HASWELL(dev) || IS_BROADWELL(dev)) {
psrperf = I915_READ(EDP_PSR_PERF_CNT) &
EDP_PSR_PERF_CNT_MASK;
--
2.4.3
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