'\" t
.\"     Title: drm_dp_dpcd_write
.\"    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_DP_DPCD_WRITE" "9" "May 2018" "Kernel Hackers Manual 3\&.16\&" "DRM Core"
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.SH "NAME"
drm_dp_dpcd_write \- write a series of bytes to the DPCD
.SH "SYNOPSIS"
.HP \w'ssize_t\ drm_dp_dpcd_write('u
.BI "ssize_t drm_dp_dpcd_write(struct\ drm_dp_aux\ *\ " "aux" ", unsigned\ int\ " "offset" ", void\ *\ " "buffer" ", size_t\ " "size" ");"
.SH "ARGUMENTS"
.PP
\fIaux\fR
.RS 4
DisplayPort AUX channel
.RE
.PP
\fIoffset\fR
.RS 4
address of the (first) register to write
.RE
.PP
\fIbuffer\fR
.RS 4
buffer containing the values to write
.RE
.PP
\fIsize\fR
.RS 4
number of bytes in
\fIbuffer\fR
.RE
.SH "DESCRIPTION"
.PP
Returns the number of bytes transferred on success, or a negative error code on failure\&. \-EIO is returned if the request was NAKed by the sink or if the retry count was exceeded\&. If not all bytes were transferred, this function returns \-EPROTO\&. Errors from the underlying AUX channel transfer function, with the exception of \-EBUSY (which causes the transaction to be retried), are propagated to the caller\&.
.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