'\" t
.\"     Title: drm_kms_helper_poll_init
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: May 2018
.\"    Manual: DRM Core
.\"    Source: Kernel Hackers Manual 3.16.56
.\"  Language: English
.\"
.TH "DRM_KMS_HELPER_POLL_" "9" "May 2018" "Kernel Hackers Manual 3\&.16\&" "DRM Core"
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.SH "NAME"
drm_kms_helper_poll_init \- initialize and enable output polling
.SH "SYNOPSIS"
.HP \w'void\ drm_kms_helper_poll_init('u
.BI "void drm_kms_helper_poll_init(struct\ drm_device\ *\ " "dev" ");"
.SH "ARGUMENTS"
.PP
\fIdev\fR
.RS 4
drm_device
.RE
.SH "DESCRIPTION"
.PP
This function intializes and then also enables output polling support for
\fIdev\fR\&. Drivers which do not have reliable hotplug support in hardware can use this helper infrastructure to regularly poll such connectors for changes in their connection state\&.
.PP
Drivers can control which connectors are polled by setting the DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags\&. On connectors where probing live outputs can result in visual distortion drivers should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this\&. Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are completely ignored by the polling logic\&.
.PP
Note that a connector can be both polled and probed from the hotplug handler, in case the hotplug interrupt is known to be unreliable\&.
.SH "AUTHORS"
.PP
\fBJesse Barnes\fR <\&jesse.barnes@intel.com\&>
.br
Intel Corporation, 
	    
	  
.RS 4
Initial version
.RE
.PP
\fBLaurent Pinchart\fR <\&laurent.pinchart@ideasonboard.com\&>
.br
Ideas on board SPRL, 
	    
	  
.RS 4
Driver internals
.RE
.PP
\fBDaniel Vetter\fR <\&daniel.vetter@ffwll.ch\&>
.br
Intel Corporation, 
	    
	  
.RS 4
Contributions all over the place
.RE
.SH "COPYRIGHT"
.br