[Intel-gfx] [PATCH 1/2] drm/i915: Add support for retrying hotplug
José Roberto de Souza
jose.souza at intel.com
Fri Feb 22 21:08:33 UTC 2019
From: Imre Deak <imre.deak at intel.com>
There is some scenarios that we are aware that sink probe can fail,
so lets add the infrastructure to let hotplug() hook to request
another probe after some time.
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
Signed-off-by: Jani Nikula <jani.nikula at intel.com>
Signed-off-by: Imre Deak <imre.deak at intel.com>
---
drivers/gpu/drm/i915/i915_debugfs.c | 2 +-
drivers/gpu/drm/i915/i915_drv.h | 3 +-
drivers/gpu/drm/i915/intel_ddi.c | 12 +++---
drivers/gpu/drm/i915/intel_dp.c | 12 +++---
drivers/gpu/drm/i915/intel_drv.h | 17 +++++++--
drivers/gpu/drm/i915/intel_hotplug.c | 56 ++++++++++++++++++++++------
drivers/gpu/drm/i915/intel_sdvo.c | 8 ++--
7 files changed, 79 insertions(+), 31 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 37175414ce89..8149be62a630 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -4296,7 +4296,7 @@ static int i915_hpd_storm_ctl_show(struct seq_file *m, void *data)
*/
synchronize_irq(dev_priv->drm.irq);
flush_work(&dev_priv->hotplug.dig_port_work);
- flush_work(&dev_priv->hotplug.hotplug_work);
+ flush_delayed_work(&dev_priv->hotplug.hotplug_work);
seq_printf(m, "Threshold: %d\n", hotplug->hpd_storm_threshold);
seq_printf(m, "Detected: %s\n",
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index bb0e75e43987..5703526bddab 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -156,7 +156,7 @@ enum hpd_pin {
#define HPD_STORM_DEFAULT_THRESHOLD 50
struct i915_hotplug {
- struct work_struct hotplug_work;
+ struct delayed_work hotplug_work;
struct {
unsigned long last_jiffies;
@@ -168,6 +168,7 @@ struct i915_hotplug {
} state;
} stats[HPD_NUM_PINS];
u32 event_bits;
+ u32 retry_bits;
struct delayed_work reenable_work;
u32 long_port_mask;
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index ea83071a22c4..1676a87f18cb 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -4051,14 +4051,16 @@ static int intel_hdmi_reset_link(struct intel_encoder *encoder,
return modeset_pipe(&crtc->base, ctx);
}
-static bool intel_ddi_hotplug(struct intel_encoder *encoder,
- struct intel_connector *connector)
+static enum intel_hotplug_state
+intel_ddi_hotplug(struct intel_encoder *encoder,
+ struct intel_connector *connector,
+ bool irq_received)
{
struct drm_modeset_acquire_ctx ctx;
- bool changed;
+ enum intel_hotplug_state state;
int ret;
- changed = intel_encoder_hotplug(encoder, connector);
+ state = intel_encoder_hotplug(encoder, connector, irq_received);
drm_modeset_acquire_init(&ctx, 0);
@@ -4080,7 +4082,7 @@ static bool intel_ddi_hotplug(struct intel_encoder *encoder,
drm_modeset_acquire_fini(&ctx);
WARN(ret, "Acquiring modeset locks failed with %i\n", ret);
- return changed;
+ return state;
}
static struct intel_connector *
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index e1a051c0fbfe..0bb43eaa154c 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4734,14 +4734,16 @@ int intel_dp_retrain_link(struct intel_encoder *encoder,
* retrain the link to get a picture. That's in case no
* userspace component reacted to intermittent HPD dip.
*/
-static bool intel_dp_hotplug(struct intel_encoder *encoder,
- struct intel_connector *connector)
+static enum intel_hotplug_state
+intel_dp_hotplug(struct intel_encoder *encoder,
+ struct intel_connector *connector,
+ bool irq_received)
{
struct drm_modeset_acquire_ctx ctx;
- bool changed;
+ enum intel_hotplug_state state;
int ret;
- changed = intel_encoder_hotplug(encoder, connector);
+ state = intel_encoder_hotplug(encoder, connector, irq_received);
drm_modeset_acquire_init(&ctx, 0);
@@ -4760,7 +4762,7 @@ static bool intel_dp_hotplug(struct intel_encoder *encoder,
drm_modeset_acquire_fini(&ctx);
WARN(ret, "Acquiring modeset locks failed with %i\n", ret);
- return changed;
+ return state;
}
static void intel_dp_check_service_irq(struct intel_dp *intel_dp)
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 81ec73e4a083..de62af970dc1 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -226,14 +226,21 @@ struct intel_fbdev {
struct mutex hpd_lock;
};
+enum intel_hotplug_state {
+ INTEL_HOTPLUG_NOCHANGE,
+ INTEL_HOTPLUG_CHANGED,
+ INTEL_HOTPLUG_RETRY,
+};
+
struct intel_encoder {
struct drm_encoder base;
enum intel_output_type type;
enum port port;
unsigned int cloneable;
- bool (*hotplug)(struct intel_encoder *encoder,
- struct intel_connector *connector);
+ enum intel_hotplug_state (*hotplug)(struct intel_encoder *encoder,
+ struct intel_connector *connector,
+ bool irq_received);
enum intel_output_type (*compute_output_type)(struct intel_encoder *,
struct intel_crtc_state *,
struct drm_connector_state *);
@@ -2003,8 +2010,10 @@ int intel_dsi_dcs_init_backlight_funcs(struct intel_connector *intel_connector);
void intel_dvo_init(struct drm_i915_private *dev_priv);
/* intel_hotplug.c */
void intel_hpd_poll_init(struct drm_i915_private *dev_priv);
-bool intel_encoder_hotplug(struct intel_encoder *encoder,
- struct intel_connector *connector);
+enum intel_hotplug_state
+intel_encoder_hotplug(struct intel_encoder *encoder,
+ struct intel_connector *connector,
+ bool irq_received);
/* legacy fbdev emulation in intel_fbdev.c */
#ifdef CONFIG_DRM_FBDEV_EMULATION
diff --git a/drivers/gpu/drm/i915/intel_hotplug.c b/drivers/gpu/drm/i915/intel_hotplug.c
index b8937c788f03..3eaa06526f6b 100644
--- a/drivers/gpu/drm/i915/intel_hotplug.c
+++ b/drivers/gpu/drm/i915/intel_hotplug.c
@@ -111,6 +111,7 @@ enum hpd_pin intel_hpd_pin_default(struct drm_i915_private *dev_priv,
#define HPD_STORM_DETECT_PERIOD 1000
#define HPD_STORM_REENABLE_DELAY (2 * 60 * 1000)
+#define HPD_RETRY_DELAY 1000
/**
* intel_hpd_irq_storm_detect - gather stats and detect HPD IRQ storm on a pin
@@ -265,8 +266,10 @@ static void intel_hpd_irq_storm_reenable_work(struct work_struct *work)
intel_runtime_pm_put(dev_priv, wakeref);
}
-bool intel_encoder_hotplug(struct intel_encoder *encoder,
- struct intel_connector *connector)
+enum intel_hotplug_state
+intel_encoder_hotplug(struct intel_encoder *encoder,
+ struct intel_connector *connector,
+ bool irq_received)
{
struct drm_device *dev = connector->base.dev;
enum drm_connector_status old_status;
@@ -278,7 +281,7 @@ bool intel_encoder_hotplug(struct intel_encoder *encoder,
drm_helper_probe_detect(&connector->base, NULL, false);
if (old_status == connector->base.status)
- return false;
+ return INTEL_HOTPLUG_NOCHANGE;
DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
connector->base.base.id,
@@ -286,7 +289,7 @@ bool intel_encoder_hotplug(struct intel_encoder *encoder,
drm_get_connector_status_name(old_status),
drm_get_connector_status_name(connector->base.status));
- return true;
+ return INTEL_HOTPLUG_CHANGED;
}
static bool intel_encoder_has_hpd_pulse(struct intel_encoder *encoder)
@@ -338,7 +341,7 @@ static void i915_digport_work_func(struct work_struct *work)
spin_lock_irq(&dev_priv->irq_lock);
dev_priv->hotplug.event_bits |= old_bits;
spin_unlock_irq(&dev_priv->irq_lock);
- schedule_work(&dev_priv->hotplug.hotplug_work);
+ schedule_delayed_work(&dev_priv->hotplug.hotplug_work, 0);
}
}
@@ -348,14 +351,17 @@ static void i915_digport_work_func(struct work_struct *work)
static void i915_hotplug_work_func(struct work_struct *work)
{
struct drm_i915_private *dev_priv =
- container_of(work, struct drm_i915_private, hotplug.hotplug_work);
+ container_of(work, struct drm_i915_private,
+ hotplug.hotplug_work.work);
struct drm_device *dev = &dev_priv->drm;
struct intel_connector *intel_connector;
struct intel_encoder *intel_encoder;
struct drm_connector *connector;
struct drm_connector_list_iter conn_iter;
bool changed = false;
+ u32 retry = 0;
u32 hpd_event_bits;
+ u32 hpd_retry_bits;
mutex_lock(&dev->mode_config.mutex);
DRM_DEBUG_KMS("running encoder hotplug functions\n");
@@ -364,6 +370,8 @@ static void i915_hotplug_work_func(struct work_struct *work)
hpd_event_bits = dev_priv->hotplug.event_bits;
dev_priv->hotplug.event_bits = 0;
+ hpd_retry_bits = dev_priv->hotplug.retry_bits;
+ dev_priv->hotplug.retry_bits = 0;
/* Enable polling for connectors which had HPD IRQ storms */
intel_hpd_irq_storm_switch_to_polling(dev_priv);
@@ -372,16 +380,29 @@ static void i915_hotplug_work_func(struct work_struct *work)
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter) {
+ u32 hpd_bit;
+
intel_connector = to_intel_connector(connector);
if (!intel_connector->encoder)
continue;
intel_encoder = intel_connector->encoder;
- if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) {
+ hpd_bit = BIT(intel_encoder->hpd_pin);
+ if ((hpd_event_bits | hpd_retry_bits) & hpd_bit) {
DRM_DEBUG_KMS("Connector %s (pin %i) received hotplug event.\n",
connector->name, intel_encoder->hpd_pin);
- changed |= intel_encoder->hotplug(intel_encoder,
- intel_connector);
+ switch (intel_encoder->hotplug(intel_encoder,
+ intel_connector,
+ hpd_event_bits & hpd_bit)) {
+ case INTEL_HOTPLUG_NOCHANGE:
+ break;
+ case INTEL_HOTPLUG_CHANGED:
+ changed = true;
+ break;
+ case INTEL_HOTPLUG_RETRY:
+ retry |= hpd_bit;
+ break;
+ }
}
}
drm_connector_list_iter_end(&conn_iter);
@@ -389,6 +410,15 @@ static void i915_hotplug_work_func(struct work_struct *work)
if (changed)
drm_kms_helper_hotplug_event(dev);
+
+ if (retry) {
+ spin_lock_irq(&dev_priv->irq_lock);
+ dev_priv->hotplug.retry_bits |= retry;
+ spin_unlock_irq(&dev_priv->irq_lock);
+
+ mod_delayed_work(system_wq, &dev_priv->hotplug.hotplug_work,
+ msecs_to_jiffies(HPD_RETRY_DELAY));
+ }
}
@@ -515,7 +545,7 @@ void intel_hpd_irq_handler(struct drm_i915_private *dev_priv,
if (queue_dig)
queue_work(dev_priv->hotplug.dp_wq, &dev_priv->hotplug.dig_port_work);
if (queue_hp)
- schedule_work(&dev_priv->hotplug.hotplug_work);
+ schedule_delayed_work(&dev_priv->hotplug.hotplug_work, 0);
}
/**
@@ -635,7 +665,8 @@ void intel_hpd_poll_init(struct drm_i915_private *dev_priv)
void intel_hpd_init_work(struct drm_i915_private *dev_priv)
{
- INIT_WORK(&dev_priv->hotplug.hotplug_work, i915_hotplug_work_func);
+ INIT_DELAYED_WORK(&dev_priv->hotplug.hotplug_work,
+ i915_hotplug_work_func);
INIT_WORK(&dev_priv->hotplug.dig_port_work, i915_digport_work_func);
INIT_WORK(&dev_priv->hotplug.poll_init_work, i915_hpd_poll_init_work);
INIT_DELAYED_WORK(&dev_priv->hotplug.reenable_work,
@@ -649,11 +680,12 @@ void intel_hpd_cancel_work(struct drm_i915_private *dev_priv)
dev_priv->hotplug.long_port_mask = 0;
dev_priv->hotplug.short_port_mask = 0;
dev_priv->hotplug.event_bits = 0;
+ dev_priv->hotplug.retry_bits = 0;
spin_unlock_irq(&dev_priv->irq_lock);
cancel_work_sync(&dev_priv->hotplug.dig_port_work);
- cancel_work_sync(&dev_priv->hotplug.hotplug_work);
+ cancel_delayed_work_sync(&dev_priv->hotplug.hotplug_work);
cancel_work_sync(&dev_priv->hotplug.poll_init_work);
cancel_delayed_work_sync(&dev_priv->hotplug.reenable_work);
}
diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index e7b0884ba5a5..92793475b2b9 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -1722,12 +1722,14 @@ static void intel_sdvo_enable_hotplug(struct intel_encoder *encoder)
&intel_sdvo->hotplug_active, 2);
}
-static bool intel_sdvo_hotplug(struct intel_encoder *encoder,
- struct intel_connector *connector)
+static enum intel_hotplug_state
+intel_sdvo_hotplug(struct intel_encoder *encoder,
+ struct intel_connector *connector,
+ bool irq_received)
{
intel_sdvo_enable_hotplug(encoder);
- return intel_encoder_hotplug(encoder, connector);
+ return intel_encoder_hotplug(encoder, connector, irq_received);
}
static bool
--
2.20.1
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