[Intel-gfx] DRM Inquiry

[Jani Nikula]

On Mon, 11 Jun 2018, John Sledge <john_sledget at yahoo.com> wrote:
> 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.

Why are you disabling it again? Just enable the config, use the
resulting kernel, and do the rest in userspace.

> 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.

Don't do this. I don't understand what you're trying to do.

> Please have comments and advice.

Please explain what you're trying to do to begin with. What's your end
goal?

BR,
Jani.


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-- 
Jani Nikula, Intel Open Source Graphics Center