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drm/probe-helper: enable and disable HPD on connectors

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Introduce two drm_connector_helper_funcs: enable_hpd() and disable_hpd().
They are called by drm_kms_helper_poll_enable() and
drm_kms_helper_poll_disable() (and thus drm_kms_helper_poll_init() and
drm_kms_helper_poll_fini()) respectively.

This allows DRM drivers to rely on drm_kms_helper_poll for enabling and
disabling HPD detection rather than doing that manually.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20221102180705.459294-3-dmitry.baryshkov@linaro.org
This commit is contained in:
Dmitry Baryshkov 2022-11-02 21:07:00 +03:00 committed by Neil Armstrong
parent 78b991ccfa
commit c8268795c9
2 changed files with 41 additions and 0 deletions
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19
drivers/gpu/drm/drm_probe_helper.c
View file

@ -250,6 +250,12 @@ void drm_kms_helper_poll_enable(struct drm_device *dev)
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter) {
const struct drm_connector_helper_funcs *funcs =
connector->helper_private;
if (funcs && funcs->enable_hpd)
funcs->enable_hpd(connector);
if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
DRM_CONNECTOR_POLL_DISCONNECT))
poll = true;
@ -804,12 +810,25 @@ EXPORT_SYMBOL(drm_kms_helper_is_poll_worker);
static void drm_kms_helper_poll_disable_fini(struct drm_device *dev, bool fini)
{
struct drm_connector *connector;
struct drm_connector_list_iter conn_iter;
if (!dev->mode_config.poll_enabled)
return;
if (fini)
dev->mode_config.poll_enabled = false;
drm_connector_list_iter_begin(dev, &conn_iter);
drm_for_each_connector_iter(connector, &conn_iter) {
const struct drm_connector_helper_funcs *funcs =
connector->helper_private;
if (funcs && funcs->disable_hpd)
funcs->disable_hpd(connector);
}
drm_connector_list_iter_end(&conn_iter);
cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
}

22
include/drm/drm_modeset_helper_vtables.h
View file

@ -1143,6 +1143,28 @@ struct drm_connector_helper_funcs {
*/
void (*cleanup_writeback_job)(struct drm_writeback_connector *connector,
struct drm_writeback_job *job);
/**
* @enable_hpd:
*
* Enable hot-plug detection for the connector.
*
* This operation is optional.
*
* This callback is used by the drm_kms_helper_poll_enable() helpers.
*/
void (*enable_hpd)(struct drm_connector *connector);
/**
* @disable_hpd:
*
* Disable hot-plug detection for the connector.
*
* This operation is optional.
*
* This callback is used by the drm_kms_helper_poll_disable() helpers.
*/
void (*disable_hpd)(struct drm_connector *connector);
};
/**