Hi All,
Good day!
I’ve been doing some PTN3460 programming under Linux using C/C++ and I have some questions regarding on setting the brightness level to my display device.
The display device with PTN3460 is connected in DP (display port) to my computer. Only needs a DisplayPort native AUX command to access DPCD address from PTN3460.
I’m currently looking into the DRM (Direct Rendering Manager) a subsystem of the Linux kernel. It has a methods drm_dp_dpcd_readb, drm_dp_dpcd_read and drm_dp_dpcd_write.
Do you have any suggestions or advice how to use the kernel driver in DRM in regards to how to implement the method drm_dp_dpcd_readb for example? I couldn't not find any test tool examples that implement it. Biggest concern is I don't have sufficient knowledge where to start what to code using the DRM module.
Name
drm_dp_dpcd_readb — read a single byte from the DPCD
Synopsis
ssize_t drm_dp_dpcd_readb ( struct drm_dp_aux * aux,
unsigned int offset,
u8 * valuep);
Arguments
aux - DisplayPort AUX channel
offset - address of the register to read
valuep - location where the value of the register will be stored
Description
Returns the number of bytes transferred (1) on success, or a negative error code on failure.
Regards,
John
_______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
