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drm/i915/display: convert inner wakeref get towards get_if_in_use

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This patch brings no functional change. Since at this point of
the code we are already asserting a wakeref was held, it means
that we are with runtime_pm 'in_use' and in practical terms we
are only bumping the pm_runtime usage counter and moving on.

However, xe driver has a lockdep annotation that warned us that
if a sync resume was actually called at this point, we could have
a deadlock because we are inside the power_domains->lock locked
area and the resume would call the irq_reset, which would also
try to get the power_domains->lock.

For this reason, let's convert this call to a safer option and
calm lockdep on.

v2: use _noresume variant instead of get_in_use (Ville, Imre)

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Imre Deak <imre.deak@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Francois Dugast <francois.dugast@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240417203952.25503-3-rodrigo.vivi@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Rodrigo Vivi 2024-04-17 16:39:45 -04:00
parent 82e279a49a
commit 77e619a82f
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GPG key ID: FA625F640EEB13CA
1 changed files with 1 additions and 1 deletions
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drivers/gpu/drm/i915/display/intel_display_power.c
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@ -646,7 +646,7 @@ release_async_put_domains(struct i915_power_domains *power_domains,
* power well disabling.
*/
assert_rpm_raw_wakeref_held(rpm);
wakeref = intel_runtime_pm_get(rpm);
wakeref = intel_runtime_pm_get_noresume(rpm);
for_each_power_domain(domain, mask) {
/* Clear before put, so put's sanity check is happy. */