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Date: Mon, 16 May 2022 14:05:48 +0200
From: Hans de Goede <hdegoede@...hat.com>
To: Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
Bjorn Andersson <bjorn.andersson@...aro.org>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
Abhinav Kumar <quic_abhinavk@...cinc.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Kuogee Hsieh <quic_khsieh@...cinc.com>,
Stephen Boyd <swboyd@...omium.org>,
linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
intel-gfx@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
freedreno@...ts.freedesktop.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v4 2/5] drm: Add HPD state to
drm_connector_oob_hotplug_event()
Hi,
On 5/16/22 13:25, Heikki Krogerus wrote:
> +Hans
>
> Hans, do you have any comments?
Thanks for the ping, this looks good to me:
Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Regards,
Hans
>
> On Mon, May 02, 2022 at 09:53:13AM -0700, Bjorn Andersson wrote:
>> In some implementations, such as the Qualcomm platforms, the display
>> driver has no way to query the current HPD state and as such it's
>> impossible to distinguish between disconnect and attention events.
>>
>> Add a parameter to drm_connector_oob_hotplug_event() to pass the HPD
>> state.
>>
>> Also push the test for unchanged state in the displayport altmode driver
>> into the i915 driver, to allow other drivers to act upon each update.
>>
>> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
>> ---
>>
>> Changes since v3:
>> - Transition to drm_connector_status instead of custom hpd_state
>>
>> drivers/gpu/drm/drm_connector.c | 6 ++++--
>> drivers/gpu/drm/i915/display/intel_dp.c | 17 ++++++++++++++---
>> drivers/gpu/drm/i915/i915_drv.h | 3 +++
>> drivers/usb/typec/altmodes/displayport.c | 10 +++-------
>> include/drm/drm_connector.h | 6 ++++--
>> 5 files changed, 28 insertions(+), 14 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
>> index 1c48d162c77e..e86c69f0640f 100644
>> --- a/drivers/gpu/drm/drm_connector.c
>> +++ b/drivers/gpu/drm/drm_connector.c
>> @@ -2794,6 +2794,7 @@ struct drm_connector *drm_connector_find_by_fwnode(struct fwnode_handle *fwnode)
>> /**
>> * drm_connector_oob_hotplug_event - Report out-of-band hotplug event to connector
>> * @connector_fwnode: fwnode_handle to report the event on
>> + * @status: hot plug detect logical state
>> *
>> * On some hardware a hotplug event notification may come from outside the display
>> * driver / device. An example of this is some USB Type-C setups where the hardware
>> @@ -2803,7 +2804,8 @@ struct drm_connector *drm_connector_find_by_fwnode(struct fwnode_handle *fwnode)
>> * This function can be used to report these out-of-band events after obtaining
>> * a drm_connector reference through calling drm_connector_find_by_fwnode().
>> */
>> -void drm_connector_oob_hotplug_event(struct fwnode_handle *connector_fwnode)
>> +void drm_connector_oob_hotplug_event(struct fwnode_handle *connector_fwnode,
>> + enum drm_connector_status status)
>> {
>> struct drm_connector *connector;
>>
>> @@ -2812,7 +2814,7 @@ void drm_connector_oob_hotplug_event(struct fwnode_handle *connector_fwnode)
>> return;
>>
>> if (connector->funcs->oob_hotplug_event)
>> - connector->funcs->oob_hotplug_event(connector);
>> + connector->funcs->oob_hotplug_event(connector, status);
>>
>> drm_connector_put(connector);
>> }
>> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
>> index e4a79c11fd25..56cc023f7bbd 100644
>> --- a/drivers/gpu/drm/i915/display/intel_dp.c
>> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
>> @@ -4951,15 +4951,26 @@ static int intel_dp_connector_atomic_check(struct drm_connector *conn,
>> return intel_modeset_synced_crtcs(state, conn);
>> }
>>
>> -static void intel_dp_oob_hotplug_event(struct drm_connector *connector)
>> +static void intel_dp_oob_hotplug_event(struct drm_connector *connector,
>> + enum drm_connector_status hpd_state)
>> {
>> struct intel_encoder *encoder = intel_attached_encoder(to_intel_connector(connector));
>> struct drm_i915_private *i915 = to_i915(connector->dev);
>> + bool hpd_high = hpd_state == connector_status_connected;
>> + unsigned int hpd_pin = encoder->hpd_pin;
>> + bool need_work = false;
>>
>> spin_lock_irq(&i915->irq_lock);
>> - i915->hotplug.event_bits |= BIT(encoder->hpd_pin);
>> + if (hpd_high != test_bit(hpd_pin, &i915->hotplug.oob_hotplug_last_state)) {
>> + i915->hotplug.event_bits |= BIT(hpd_pin);
>> +
>> + __assign_bit(hpd_pin, &i915->hotplug.oob_hotplug_last_state, hpd_high);
>> + need_work = true;
>> + }
>> spin_unlock_irq(&i915->irq_lock);
>> - queue_delayed_work(system_wq, &i915->hotplug.hotplug_work, 0);
>> +
>> + if (need_work)
>> + queue_delayed_work(system_wq, &i915->hotplug.hotplug_work, 0);
>> }
>>
>> static const struct drm_connector_funcs intel_dp_connector_funcs = {
>> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
>> index 24111bf42ce0..96c088bb5522 100644
>> --- a/drivers/gpu/drm/i915/i915_drv.h
>> +++ b/drivers/gpu/drm/i915/i915_drv.h
>> @@ -135,6 +135,9 @@ struct i915_hotplug {
>> /* Whether or not to count short HPD IRQs in HPD storms */
>> u8 hpd_short_storm_enabled;
>>
>> + /* Last state reported by oob_hotplug_event for each encoder */
>> + unsigned long oob_hotplug_last_state;
>> +
>> /*
>> * if we get a HPD irq from DP and a HPD irq from non-DP
>> * the non-DP HPD could block the workqueue on a mode config
>> diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c
>> index c1d8c23baa39..9360ca177c7d 100644
>> --- a/drivers/usb/typec/altmodes/displayport.c
>> +++ b/drivers/usb/typec/altmodes/displayport.c
>> @@ -59,7 +59,6 @@ struct dp_altmode {
>> struct typec_displayport_data data;
>>
>> enum dp_state state;
>> - bool hpd;
>>
>> struct mutex lock; /* device lock */
>> struct work_struct work;
>> @@ -143,10 +142,8 @@ static int dp_altmode_status_update(struct dp_altmode *dp)
>> if (!ret)
>> dp->state = DP_STATE_CONFIGURE;
>> } else {
>> - if (dp->hpd != hpd) {
>> - drm_connector_oob_hotplug_event(dp->connector_fwnode);
>> - dp->hpd = hpd;
>> - }
>> + drm_connector_oob_hotplug_event(dp->connector_fwnode,
>> + hpd ? connector_status_connected : connector_status_disconnected);
>> }
>>
>> return ret;
>> @@ -573,8 +570,7 @@ void dp_altmode_remove(struct typec_altmode *alt)
>> cancel_work_sync(&dp->work);
>>
>> if (dp->connector_fwnode) {
>> - if (dp->hpd)
>> - drm_connector_oob_hotplug_event(dp->connector_fwnode);
>> + drm_connector_oob_hotplug_event(dp->connector_fwnode, connector_status_disconnected);
>>
>> fwnode_handle_put(dp->connector_fwnode);
>> }
>> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
>> index 3ac4bf87f257..886aa1861ed9 100644
>> --- a/include/drm/drm_connector.h
>> +++ b/include/drm/drm_connector.h
>> @@ -1141,7 +1141,8 @@ struct drm_connector_funcs {
>> * This will get called when a hotplug-event for a drm-connector
>> * has been received from a source outside the display driver / device.
>> */
>> - void (*oob_hotplug_event)(struct drm_connector *connector);
>> + void (*oob_hotplug_event)(struct drm_connector *connector,
>> + enum drm_connector_status status);
>>
>> /**
>> * @debugfs_init:
>> @@ -1749,7 +1750,8 @@ drm_connector_is_unregistered(struct drm_connector *connector)
>> DRM_CONNECTOR_UNREGISTERED;
>> }
>>
>> -void drm_connector_oob_hotplug_event(struct fwnode_handle *connector_fwnode);
>> +void drm_connector_oob_hotplug_event(struct fwnode_handle *connector_fwnode,
>> + enum drm_connector_status status);
>> const char *drm_get_connector_type_name(unsigned int connector_type);
>> const char *drm_get_connector_status_name(enum drm_connector_status status);
>> const char *drm_get_subpixel_order_name(enum subpixel_order order);
>> --
>> 2.35.1
>
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