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drm/amd/display: Add trigger connector unplug

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[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: Eryk Brol <eryk.brol@amd.com>
Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Eryk Brol 2020-08-27 15:45:06 -04:00 committed by Alex Deucher
parent 0749ddeb7d
commit 6b29bb3737
1 changed files with 29 additions and 2 deletions
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31
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
View File

@ -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);
}
mutex_unlock(&aconnector->hpd_lock);
kfree(wr_buf);
return size;