drm/rockchip: cdn-dp: Use drm_connector_helper_hpd_irq_event()

The code for detecting and updating the connector status in
cdn_dp_pd_event_work() has a number of problems.

- It does not aquire the locks to call the detect helper and update
the connector status. These are struct drm_mode_config.connection_mutex
and struct drm_mode_config.mutex.

- It does not use drm_helper_probe_detect(), which helps with the
details of locking and detection.

- It uses the connector's status field to determine a change to
the connector status. The epoch_counter field is the correct one. The
field signals a change even if the connector status' value did not
change.

Replace the code with a call to drm_connector_helper_hpd_irq_event(),
which fixes all these problems.

Signed-off-by: Thomas Zimmermann <[email protected]>
Fixes: 81632df69772 ("drm/rockchip: cdn-dp: do not use drm_helper_hpd_irq_event")
Cc: Chris Zhong <[email protected]>
Cc: Guenter Roeck <[email protected]>
Cc: Sandy Huang <[email protected]>
Cc: "Heiko Stübner" <[email protected]>
Cc: Andy Yan <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: <[email protected]> # v4.11+
Signed-off-by: Heiko Stuebner <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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