Add a helper to reschedule drm_mode_config::output_poll_work after polling has been enabled for a connector (and needing a reschedule, since previously polling was disabled for all connectors and hence output_poll_work was not running).

This is needed by the next patch fixing HPD polling on i915.

CC: stable@vger.kernel.org # 6.4+ Cc: Dmitry Baryshkov dmitry.baryshkov@linaro.org Cc: dri-devel@lists.freedesktop.org Reviewed-by: Jouni Högander jouni.hogander@intel.com Reviewed-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org Signed-off-by: Imre Deak imre.deak@intel.com --- drivers/gpu/drm/drm_probe_helper.c | 68 ++++++++++++++++++++---------- include/drm/drm_probe_helper.h | 1 + 2 files changed, 47 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c index 2fb9bf901a2cc..3f479483d7d80 100644 --- a/drivers/gpu/drm/drm_probe_helper.c +++ b/drivers/gpu/drm/drm_probe_helper.c @@ -262,6 +262,26 @@ static bool drm_kms_helper_enable_hpd(struct drm_device *dev) }

#define DRM_OUTPUT_POLL_PERIOD (10*HZ) +static void reschedule_output_poll_work(struct drm_device *dev) +{ + unsigned long delay = DRM_OUTPUT_POLL_PERIOD; + + if (dev->mode_config.delayed_event) + /* + * FIXME: + * + * Use short (1s) delay to handle the initial delayed event. + * This delay should not be needed, but Optimus/nouveau will + * fail in a mysterious way if the delayed event is handled as + * soon as possible like it is done in + * drm_helper_probe_single_connector_modes() in case the poll + * was enabled before. + */ + delay = HZ; + + schedule_delayed_work(&dev->mode_config.output_poll_work, delay); +} + /** * drm_kms_helper_poll_enable - re-enable output polling. * @dev: drm_device @@ -279,37 +299,41 @@ static bool drm_kms_helper_enable_hpd(struct drm_device *dev) */ void drm_kms_helper_poll_enable(struct drm_device *dev) { - bool poll = false; - unsigned long delay = DRM_OUTPUT_POLL_PERIOD; - if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll || dev->mode_config.poll_running) return;

- poll = drm_kms_helper_enable_hpd(dev); - - if (dev->mode_config.delayed_event) { - /* - * FIXME: - * - * Use short (1s) delay to handle the initial delayed event. - * This delay should not be needed, but Optimus/nouveau will - * fail in a mysterious way if the delayed event is handled as - * soon as possible like it is done in - * drm_helper_probe_single_connector_modes() in case the poll - * was enabled before. - */ - poll = true; - delay = HZ; - } - - if (poll) - schedule_delayed_work(&dev->mode_config.output_poll_work, delay); + if (drm_kms_helper_enable_hpd(dev) || + dev->mode_config.delayed_event) + reschedule_output_poll_work(dev);

dev->mode_config.poll_running = true; } EXPORT_SYMBOL(drm_kms_helper_poll_enable);

+/** + * drm_kms_helper_poll_reschedule - reschedule the output polling work + * @dev: drm_device + * + * This function reschedules the output polling work, after polling for a + * connector has been enabled. + * + * Drivers must call this helper after enabling polling for a connector by + * setting %DRM_CONNECTOR_POLL_CONNECT / %DRM_CONNECTOR_POLL_DISCONNECT flags + * in drm_connector::polled. Note that after disabling polling by clearing these + * flags for a connector will stop the output polling work automatically if + * the polling is disabled for all other connectors as well. + * + * The function can be called only after polling has been enabled by calling + * drm_kms_helper_poll_init() / drm_kms_helper_poll_enable(). + */ +void drm_kms_helper_poll_reschedule(struct drm_device *dev) +{ + if (dev->mode_config.poll_running) + reschedule_output_poll_work(dev); +} +EXPORT_SYMBOL(drm_kms_helper_poll_reschedule); + static enum drm_connector_status drm_helper_probe_detect_ctx(struct drm_connector *connector, bool force) { diff --git a/include/drm/drm_probe_helper.h b/include/drm/drm_probe_helper.h index 4977e0ab72dbb..fad3c4003b2b5 100644 --- a/include/drm/drm_probe_helper.h +++ b/include/drm/drm_probe_helper.h @@ -25,6 +25,7 @@ void drm_kms_helper_connector_hotplug_event(struct drm_connector *connector);

void drm_kms_helper_poll_disable(struct drm_device *dev); void drm_kms_helper_poll_enable(struct drm_device *dev); +void drm_kms_helper_poll_reschedule(struct drm_device *dev); bool drm_kms_helper_is_poll_worker(void);

enum drm_mode_status drm_crtc_helper_mode_valid_fixed(struct drm_crtc *crtc,