diff options
| author | Imre Deak <imre.deak@intel.com> | 2024-01-04 10:29:57 +0200 |
|---|---|---|
| committer | Imre Deak <imre.deak@intel.com> | 2024-01-08 18:51:31 +0200 |
| commit | 289d4180bda98bfd47e0dac402a1caf2a8f50cf7 (patch) | |
| tree | 56defee96049b35a1e745110a0b50f382103d6ab /drivers/gpu/drm/i915/display/intel_dvo.c | |
| parent | 0fa647659c492c0a4342f7da70f5f946a40df250 (diff) | |
drm/i915: Init DRM connector polled field early
After an HPD IRQ storm on a connector intel_hpd_irq_storm_detect() will
set the connector's HPD pin state to HPD_MARK_DISABLED and the IRQ gets
disabled. Subsequently intel_hpd_irq_storm_switch_to_polling() will
enable polling for these connectors, setting the pin state to
HPD_DISABLED, but only if the connector's base.polled field is set to
DRM_CONNECTOR_POLL_HPD. intel_hpd_irq_storm_reenable_work() will
reenable the IRQ - after 2 minutes - if the pin state is HPD_DISABLED.
The connectors will be created with their base.polled field set to 0,
which gets initialized only later in i915_hpd_poll_init_work() (using
intel_connector::polled). If a storm is detected on a connector after
it's created and IRQs are enabled on it - by intel_hpd_init() - and
before its bease.polled field is initialized in the above work, the
connector's HPD pin will stay in the HPD_MARK_DISABLED state - leaving
the IRQ disabled indefinitely - and polling will not get enabled on it as
intended.
I can't see a reason for initializing base.polled in a delayed manner,
so do this already when creating the connector, to prevent the above
race condition.
Link: https://patchwork.freedesktop.org/patch/msgid/20240104083008.2715733-2-imre.deak@intel.com
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Diffstat (limited to 'drivers/gpu/drm/i915/display/intel_dvo.c')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_dvo.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_dvo.c b/drivers/gpu/drm/i915/display/intel_dvo.c index 9111e9d46486..83898ba493d1 100644 --- a/drivers/gpu/drm/i915/display/intel_dvo.c +++ b/drivers/gpu/drm/i915/display/intel_dvo.c @@ -536,6 +536,7 @@ void intel_dvo_init(struct drm_i915_private *i915) if (intel_dvo->dev.type == INTEL_DVO_CHIP_TMDS) connector->polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT; + connector->base.polled = connector->polled; drm_connector_init_with_ddc(&i915->drm, &connector->base, &intel_dvo_connector_funcs, |