[Intel-gfx] DRM Inquiry

[John Sledge]

 Hi Jani,
Thanks for the help. I was able to manage your advice on the drm_dp_aux_chardev. Though I still need to learn more about the DRM vs kernel process flow. Like for example, upon changing/adding DRM_DP_AUX_CHARDEV in kernel .config, How did DRM_DP_AUX_CHARDEV was being invoke here? From the code, I notice character device will be created under drm_dp_aux_register_devnode method.
For example I made two kernel 4.6 with DRM_DP_AUX_CHARDEV=y and another kernel 4.6 with DRM_DP_AUX_CHARDEV=n. 
So the steps was to build and install the kernel with DRM_DP_AUX_CHARDEV=y. Once finish, I tried to reboot and verified the /dev/drm_dp_aux_chardev* and it was there. Now, I will change the .config DRM_DP_AUXCHARDEV=n then follow the steps below to manual build the DRM module. I'm not really sure if I'm correct on this one.
1. rm /dev/drm_dp_aux_chardev* 2. make modules_prepare3. make SUBDIRS=scripts/mod4. make SUBDIRS=drivers/gpu/drm modules5. cp drivers/gpu/drm/i915/i915.ko /lib/modules/4.6.0-94.11-default/kernel/drivers/gpu/drm6. ... I copy all .ko under drm to the lib/modules/4.67. depmod8. modprobe i9159. ... I also modprobe all modules10. reboot
The result was /dev/drm_dp_aux_chardev* was still there. My expectation was it would disrepair or remove.
Please have comments and advice.
Regards,John 





    On Saturday, May 26, 2018, 1:14:40 AM GMT+8, Jani Nikula <jani.nikula at linux.intel.com> wrote:  
 
 On Fri, 25 May 2018, "Taylor, Clinton A" <clinton.a.taylor at intel.com> wrote:
> Looks like the seek=%d in the sprintf is not working.

Yeah. Try skip=%d instead.

BR,
Jani.


-- 
Jani Nikula, Intel Open Source Graphics Center
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