From: Eryk Brol <eryk.brol@xxxxxxx> [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@xxxxxxx> Signed-off-by: Mikita Lipski <mikita.lipski@xxxxxxx> Acked-by: Aurabindo Pillai <aurabindo.pillai@xxxxxxx> --- .../amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 31 +++++++++++++++++-- 1 file changed, 29 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c index 5cf3ba3ec5da..7c7f937166dc 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c @@ -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; @@ -1114,11 +1119,33 @@ 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; -unlock: - mutex_unlock(&aconnector->hpd_lock); + 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; } -- 2.25.1 _______________________________________________ amd-gfx mailing list amd-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/amd-gfx