Commit 6b29bb37 authored by Eryk Brol's avatar Eryk Brol Committed by Alex Deucher
Browse files

drm/amd/display: Add trigger connector unplug 



[why]
We need a virtual tool that would emulate a physical
connector unplug to usermode, while connector is
still physically plugged in.

[how]
Added a new option to debugfs entry "trigger_hotplug".
It emulates hotplug irq handling scenario by clearing
DC and DM connector states.
It can be triggered with the following command:

	echo 0 > /sys/kernel/debug/dri/0/DP-X/trigger_hotplug

Signed-off-by: default avatarEryk Brol <eryk.brol@amd.com>
Signed-off-by: default avatarMikita Lipski <mikita.lipski@amd.com>
Acked-by: default avatarAurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 0749ddeb

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c

+29 −2
Original line number Diff line number Diff line
@@ -1058,12 +1058,17 @@ static int dp_dsc_fec_support_show(struct seq_file *m, void *data) 
 *

 *	echo 1 > /sys/kernel/debug/dri/0/DP-X/trigger_hotplug

 *

 * This function can perform HPD unplug:

 *

 *	echo 0 > /sys/kernel/debug/dri/0/DP-X/trigger_hotplug

 *

 */

static ssize_t dp_trigger_hotplug(struct file *f, const char __user *buf,

							size_t size, loff_t *pos)

{

	struct amdgpu_dm_connector *aconnector = file_inode(f)->i_private;

	struct drm_connector *connector = &aconnector->base;

	struct dc_link *link = NULL;

	struct drm_device *dev = connector->dev;

	enum dc_connection_type new_connection_type = dc_connection_none;

	char *wr_buf = NULL;
@@ -1114,10 +1119,32 @@ static ssize_t dp_trigger_hotplug(struct file *f, const char __user *buf, 
		drm_modeset_unlock_all(dev);



		drm_kms_helper_hotplug_event(dev);

	} else if (param[0] == 0) {

		if (!aconnector->dc_link)

			goto unlock;



		link = aconnector->dc_link;



		if (link->local_sink) {

			dc_sink_release(link->local_sink);

			link->local_sink = NULL;

		}



		link->dpcd_sink_count = 0;

		link->type = dc_connection_none;

		link->dongle_max_pix_clk = 0;



		amdgpu_dm_update_connector_after_detect(aconnector);



		drm_modeset_lock_all(dev);

		dm_restore_drm_connector_state(dev, connector);

		drm_modeset_unlock_all(dev);



		drm_kms_helper_hotplug_event(dev);

	}



unlock:

	mutex_unlock(&aconnector->hpd_lock);

	}



	kfree(wr_buf);

	return size;