On Thu, 24 May 2018, John Sledge <john_sledget@xxxxxxxxx> wrote: > I was able to update my kernel to 4.6 which has the DRM_DP_AUX_CHARDEV > in the Kconfig file linux-4.6\drivers\gpu\drm. Though I also > add DRM_DP_AUX_CHARDEV=y in kernel config. When invoke uname -r, I > could see that the kernel is now 4.6. If you're updating kernels, why not update to a recent kernel that's actually supported...? > How can I verify the DRM_DP_AUX_CHARDEV takes effect or got configure > it correctly? Boot the kernel, run 'ls /dev/drm_dp_aux*'. If you see stuff, you got it right. > It still unclear to me how to follow what you mean by using DRM DP AUX > interface and getting /dev/drm_dp_auxN node(s) that allows me to read > and write arbitrary DPCD offsets. The device is a char device you can open, seek to an offset (which would be the DPCD offset), and read. For testing, you can achieve the same using dd. BR, Jani. -- Jani Nikula, Intel Open Source Graphics Center _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
