diff options
| -rw-r--r-- | drivers/gpu/drm/drm_dp_mst_topology.c | 32 | ||||
| -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 | ||||
| -rw-r--r-- | include/drm/drm_dp_mst_helper.h | 9 |
5 files changed, 68 insertions, 3 deletions
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 469d3569d5ca..ca936ef41312 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -1178,11 +1178,37 @@ static int drm_dp_mst_wait_tx_reply(struct drm_dp_mst_branch *mstb, struct drm_dp_sideband_msg_tx *txmsg) { struct drm_dp_mst_topology_mgr *mgr = mstb->mgr; + unsigned long wait_timeout = msecs_to_jiffies(4000); + unsigned long wait_expires = jiffies + wait_timeout; int ret; - ret = wait_event_timeout(mgr->tx_waitq, - check_txmsg_state(mgr, txmsg), - (4 * HZ)); + for (;;) { + /* + * If the driver provides a way for this, change to + * poll-waiting for the MST reply interrupt if we didn't receive + * it for 50 msec. This would cater for cases where the HPD + * pulse signal got lost somewhere, even though the sink raised + * the corresponding MST interrupt correctly. One example is the + * Club 3D CAC-1557 TypeC -> DP adapter which for some reason + * filters out short pulses with a duration less than ~540 usec. + * + * The poll period is 50 msec to avoid missing an interrupt + * after the sink has cleared it (after a 110msec timeout + * since it raised the interrupt). + */ + ret = wait_event_timeout(mgr->tx_waitq, + check_txmsg_state(mgr, txmsg), + mgr->cbs->poll_hpd_irq ? + msecs_to_jiffies(50) : + wait_timeout); + + if (ret || !mgr->cbs->poll_hpd_irq || + time_after(jiffies, wait_expires)) + break; + + mgr->cbs->poll_hpd_irq(mgr); + } + mutex_lock(&mgr->qlock); if (ret > 0) { if (txmsg->state == DRM_DP_SIDEBAND_TX_TIMEOUT) { 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); diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h index 9e1ffcd7cb68..b230ff6f7081 100644 --- a/include/drm/drm_dp_mst_helper.h +++ b/include/drm/drm_dp_mst_helper.h @@ -475,6 +475,15 @@ struct drm_dp_mst_topology_mgr; struct drm_dp_mst_topology_cbs { /* create a connector for a port */ struct drm_connector *(*add_connector)(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, const char *path); + /* + * Checks for any pending MST interrupts, passing them to MST core for + * processing, the same way an HPD IRQ pulse handler would do this. + * If provided MST core calls this callback from a poll-waiting loop + * when waiting for MST down message replies. The driver is expected + * to guard against a race between this callback and the driver's HPD + * IRQ pulse handler. + */ + void (*poll_hpd_irq)(struct drm_dp_mst_topology_mgr *mgr); }; #define DP_MAX_PAYLOAD (sizeof(unsigned long) * 8) |