diff options
author | Imre Deak <imre.deak@intel.com> | 2020-06-04 21:45:00 +0300 |
---|---|---|
committer | Imre Deak <imre.deak@intel.com> | 2020-06-11 15:28:45 +0300 |
commit | 471bdd0df0d5048d1e1bb0aa5da44f44f9856fb1 (patch) | |
tree | c920186c90a281f14e9f99c2c06e6f50e904a305 /drivers/gpu/drm/i915/display | |
parent | 8b9f3437ff5b5d059f70f9ce44d169b0cc5650ee (diff) | |
download | linux-471bdd0df0d5048d1e1bb0aa5da44f44f9856fb1.tar.xz |
drm/i915/dp_mst: Work around out-of-spec adapters filtering short pulses
Some TypeC -> native DP adapters, at least the Club 3D CAC-1557 adapter,
incorrectly filter out HPD short pulses with a duration less than
~540 usec, leading to MST probe failures.
According to the DP Standard 2.0 section 5.1.4:
- DP sinks should generate short pulses in the 500 usec -> 1 msec range
- DP sources should detect short pulses in the 250 usec -> 2 msec range
According to the DP Alt Mode on TypeC Standard section 3.9.2, adapters
should detect and forward short pulses according to how sources should
detect them as specified in the DP Standard (250 usec -> 2 msec).
Based on the above filtering out short pulses with a duration less than
540 usec is incorrect.
To make such adapters work add support for a driver polling on MST
inerrupt flags, and wire this up in the i915 driver. The sink can clear
an interrupt it raised after 110 msec if the source doesn't respond, so
use a 50 msec poll period to avoid missing an interrupt. Polling of the
MST interrupt flags is explicitly allowed by the DP Standard.
This fixes MST probe failures I saw using this adapter and a DELL U2515H
monitor.
v2:
- Fix the wait event timeout for the no-poll case.
v3 (Ville):
- Fix the short pulse duration limits in the commit log prescribed by the
DP Standard.
- Add code comment explaining why/how polling is used.
- Factor out a helper to schedule the port's hpd irq handler and move it
to the rest of hotplug handlers.
- Document the new MST callback.
- s/update_hpd_irq_state/poll_hpd_irq/
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200604184500.23730-2-imre.deak@intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/display')
-rw-r--r-- | drivers/gpu/drm/i915/display/intel_dp_mst.c | 10 | ||||
-rw-r--r-- | drivers/gpu/drm/i915/display/intel_hotplug.c | 18 | ||||
-rw-r--r-- | drivers/gpu/drm/i915/display/intel_hotplug.h | 2 |
3 files changed, 30 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c index 35debce71366..57ef82285fee 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c @@ -33,6 +33,7 @@ #include "intel_connector.h" #include "intel_ddi.h" #include "intel_display_types.h" +#include "intel_hotplug.h" #include "intel_dp.h" #include "intel_dp_mst.h" #include "intel_dpio_phy.h" @@ -747,8 +748,17 @@ err: return NULL; } +static void +intel_dp_mst_poll_hpd_irq(struct drm_dp_mst_topology_mgr *mgr) +{ + struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr); + + intel_hpd_trigger_irq(dp_to_dig_port(intel_dp)); +} + static const struct drm_dp_mst_topology_cbs mst_cbs = { .add_connector = intel_dp_add_mst_connector, + .poll_hpd_irq = intel_dp_mst_poll_hpd_irq, }; static struct intel_dp_mst_encoder * diff --git a/drivers/gpu/drm/i915/display/intel_hotplug.c b/drivers/gpu/drm/i915/display/intel_hotplug.c index a091442efba4..21445e5afbc2 100644 --- a/drivers/gpu/drm/i915/display/intel_hotplug.c +++ b/drivers/gpu/drm/i915/display/intel_hotplug.c @@ -348,6 +348,24 @@ static void i915_digport_work_func(struct work_struct *work) } } +/** + * intel_hpd_trigger_irq - trigger an hpd irq event for a port + * @dig_port: digital port + * + * Trigger an HPD interrupt event for the given port, emulating a short pulse + * generated by the sink, and schedule the dig port work to handle it. + */ +void intel_hpd_trigger_irq(struct intel_digital_port *dig_port) +{ + struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev); + + spin_lock_irq(&i915->irq_lock); + i915->hotplug.short_port_mask |= BIT(dig_port->base.port); + spin_unlock_irq(&i915->irq_lock); + + queue_work(i915->hotplug.dp_wq, &i915->hotplug.dig_port_work); +} + /* * Handle hotplug events outside the interrupt handler proper. */ diff --git a/drivers/gpu/drm/i915/display/intel_hotplug.h b/drivers/gpu/drm/i915/display/intel_hotplug.h index 1e6b4fda2900..febf1132a298 100644 --- a/drivers/gpu/drm/i915/display/intel_hotplug.h +++ b/drivers/gpu/drm/i915/display/intel_hotplug.h @@ -10,6 +10,7 @@ struct drm_i915_private; struct intel_connector; +struct intel_digital_port; struct intel_encoder; enum port; @@ -19,6 +20,7 @@ enum intel_hotplug_state intel_encoder_hotplug(struct intel_encoder *encoder, bool irq_received); void intel_hpd_irq_handler(struct drm_i915_private *dev_priv, u32 pin_mask, u32 long_mask); +void intel_hpd_trigger_irq(struct intel_digital_port *dig_port); void intel_hpd_init(struct drm_i915_private *dev_priv); void intel_hpd_init_work(struct drm_i915_private *dev_priv); void intel_hpd_cancel_work(struct drm_i915_private *dev_priv); |