other versions
- jessie 3.16.56-1+deb8u1
DRM_DP_DPCD_READ(9) | DRM Core | DRM_DP_DPCD_READ(9) |
NAME¶
drm_dp_dpcd_read - read a series of bytes from the DPCDSYNOPSIS¶
ssize_t
drm_dp_dpcd_read(struct drm_dp_aux * aux,
unsigned int offset,
void * buffer,
size_t size);
ARGUMENTS¶
auxDisplayPort AUX channel
offset
address of the (first) register to read
buffer
buffer to store the register values
size
number of bytes in buffer
DESCRIPTION¶
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.AUTHORS¶
Jesse Barnes <jesse.barnes@intel.com>Initial version
Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Driver internals
Daniel Vetter <daniel.vetter@ffwll.ch>
Contributions all over the place
COPYRIGHT¶
May 2018 | Kernel Hackers Manual 3.16 |