[Intel-gfx] [PATCH v4 1/2] drm/i915: Add support for retrying hotplug
Shane McKee
shane.mckee at intel.com
Thu Jul 11 20:55:34 UTC 2019
On Thu, Jul 11, 2019 at 11:05:15PM +0300, Ville Syrjälä wrote:
> On Wed, Jul 10, 2019 at 03:14:59PM -0700, José Roberto de Souza wrote:
> > 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.
> >
> > v2: Handle shared HPD pins (Imre)
> > v3: Rebased
> > v4: Renamed INTEL_HOTPLUG_NOCHANGE to INTEL_HOTPLUG_UNCHANGED to keep
> > it consistent(Rodrigo)
> >
> > Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Tested-by: Shane McKee <shane.mckee at intel.com>
> > Reviewed-by: Rodrigo Vivi <rodrigo.vivi at 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/display/intel_ddi.c | 12 ++--
> > drivers/gpu/drm/i915/display/intel_dp.c | 12 ++--
> > drivers/gpu/drm/i915/display/intel_hotplug.c | 59 +++++++++++++++-----
> > drivers/gpu/drm/i915/display/intel_hotplug.h | 5 +-
> > drivers/gpu/drm/i915/display/intel_sdvo.c | 8 ++-
> > drivers/gpu/drm/i915/i915_debugfs.c | 2 +-
> > drivers/gpu/drm/i915/i915_drv.h | 3 +-
> > drivers/gpu/drm/i915/intel_drv.h | 11 +++-
> > 8 files changed, 80 insertions(+), 32 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> > index ad638e7f27bb..734c004800f8 100644
> > --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> > +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> > @@ -4047,14 +4047,16 @@ 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);
> >
> > @@ -4076,7 +4078,7 @@ 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/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> > index 0bdb7ecc5a81..4423abbc7907 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> > @@ -4853,14 +4853,16 @@ 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);
> >
> > @@ -4879,7 +4881,7 @@ 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/display/intel_hotplug.c b/drivers/gpu/drm/i915/display/intel_hotplug.c
> > index ea3de4acc850..2ca92780c659 100644
> > --- a/drivers/gpu/drm/i915/display/intel_hotplug.c
> > +++ b/drivers/gpu/drm/i915/display/intel_hotplug.c
> > @@ -112,6 +112,7 @@ 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
> > @@ -266,8 +267,10 @@ static void intel_hpd_irq_storm_reenable_work(struct work_struct *work)
> > intel_runtime_pm_put(&dev_priv->runtime_pm, 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;
> > @@ -279,7 +282,7 @@ 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_UNCHANGED;
> >
> > DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
> > connector->base.base.id,
> > @@ -287,7 +290,7 @@ 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)
> > @@ -339,7 +342,7 @@ 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);
>
> Random thought: Should open code this with queue_delayed_work() instead
> so that we can be sure the wq really is the same between this call
> and the mod_delayed_work()?
>
> > }
> > }
> >
> > @@ -349,14 +352,16 @@ 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 changed = 0, retry = 0;
> > u32 hpd_event_bits;
> > + u32 hpd_retry_bits;
> >
> > mutex_lock(&dev->mode_config.mutex);
> > DRM_DEBUG_KMS("running encoder hotplug functions\n");
> > @@ -365,6 +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);
> > @@ -373,16 +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_UNCHANGED:
> > + break;
> > + case INTEL_HOTPLUG_CHANGED:
> > + changed |= hpd_bit;
> > + break;
> > + case INTEL_HOTPLUG_RETRY:
> > + retry |= hpd_bit;
> > + break;
> > + }
> > }
> > }
> > drm_connector_list_iter_end(&conn_iter);
> > @@ -390,6 +410,17 @@ static void i915_hotplug_work_func(struct work_struct *work)
> >
> > if (changed)
> > drm_kms_helper_hotplug_event(dev);
> > +
> > + /* Remove shared HPD pins that have changed */
> > + retry &= ~changed;
> > + 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));
> > + }
> > }
> >
> >
> > @@ -516,7 +547,7 @@ 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);
> > }
> >
> > /**
> > @@ -636,7 +667,8 @@ 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,
> > @@ -650,11 +682,12 @@ 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/display/intel_hotplug.h b/drivers/gpu/drm/i915/display/intel_hotplug.h
> > index 805f897dbb7a..b0cd447b7fbc 100644
> > --- a/drivers/gpu/drm/i915/display/intel_hotplug.h
> > +++ b/drivers/gpu/drm/i915/display/intel_hotplug.h
> > @@ -15,8 +15,9 @@ struct intel_connector;
> > struct intel_encoder;
> >
> > 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);
> > void intel_hpd_irq_handler(struct drm_i915_private *dev_priv,
> > u32 pin_mask, u32 long_mask);
> > void intel_hpd_init(struct drm_i915_private *dev_priv);
> > diff --git a/drivers/gpu/drm/i915/display/intel_sdvo.c b/drivers/gpu/drm/i915/display/intel_sdvo.c
> > index 3fe8eaef6bd8..639317b84e51 100644
> > --- a/drivers/gpu/drm/i915/display/intel_sdvo.c
> > +++ b/drivers/gpu/drm/i915/display/intel_sdvo.c
> > @@ -1915,12 +1915,14 @@ 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
> > diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> > index 3e4f58f19362..6d4bc983915f 100644
> > --- a/drivers/gpu/drm/i915/i915_debugfs.c
> > +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> > @@ -4090,7 +4090,7 @@ static int i915_hpd_storm_ctl_show(struct seq_file *m, void *data)
> > */
> > intel_synchronize_irq(dev_priv);
> > 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 f9878cbef4d9..f471307aa704 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.h
> > +++ b/drivers/gpu/drm/i915/i915_drv.h
> > @@ -163,7 +163,7 @@ 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;
> > @@ -175,6 +175,7 @@ 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_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> > index 24c63ed45c6f..e58d3751ed43 100644
> > --- a/drivers/gpu/drm/i915/intel_drv.h
> > +++ b/drivers/gpu/drm/i915/intel_drv.h
> > @@ -101,14 +101,21 @@ struct intel_fbdev {
> > struct mutex hpd_lock;
> > };
> >
> > +enum intel_hotplug_state {
> > + INTEL_HOTPLUG_UNCHANGED,
> > + 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 *);
> > --
> > 2.22.0
>
> --
> Ville Syrjälä
> Intel
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