From: Ville Syrjälä <ville.syrj...@linux.intel.com>
If the level 0 latency is 0 we can't do anything. Return an error
rather than success.
While this can't happen due to WaWmMemoryReadLatency, it can
happen if the user clears out the level 0 latency via debugfs.
v2: Clarify how how we can end here with zero level 0 latency (Matt)
Cc: Matt Roper <matthew.d.ro...@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.v...@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
---
drivers/gpu/drm/i915/intel_pm.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 27498ded4949..25f589c4f68c 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4704,8 +4704,10 @@ static int skl_compute_plane_wm(const struct
drm_i915_private *dev_priv,
bool apply_memory_bw_wa = skl_needs_memory_bw_wa(state);
uint32_t min_disp_buf_needed;
- if (latency == 0 ||
- !intel_wm_plane_visible(cstate, intel_pstate)) {
+ if (latency == 0)
+ return level == 0 ? -EINVAL : 0;
+
+ if (!intel_wm_plane_visible(cstate, intel_pstate)) {
result->plane_en = false;
return 0;
}
--
2.18.1
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