graphics/drm-66-kmod: fix build with clang 21

With clang 21 graphics/drm-66-kmod fails to compile, with errors similar
to:

    In file included from
/wrkdirs/usr/ports/graphics/drm-66-kmod/work/drm-kmod-drm_v6.6.25_9/drivers/gpu/drm/i915/i915_active.c:12:
   
/wrkdirs/usr/ports/graphics/drm-66-kmod/work/drm-kmod-drm_v6.6.25_9/drivers/gpu/drm/i915/gt/intel_ring.h:63:2:
error: default initialization of an object of type 'typeof (ring->size)' (aka
'const unsigned int') leaves the object uninitialized
[-Werror,-Wdefault-const-init-var-unsafe]
       63 |         typecheck(typeof(ring->size), next);
          |         ^
    /usr/src/sys/compat/linuxkpi/common/include/linux/typecheck.h:31:9: note:
expanded from macro 'typecheck'
       31 | ({      type __var1; \
          |              ^

The thread at https://lkml.org/lkml/2025/5/6/1681 appears to imply that
it is safe to suppress the new -Wdefault-const-init-var-unsafe warning.

PR:		292192
Approved by:	emaste (maintainer)
MFH:		2026Q1

graphics/drm-66-kmod: Really fix build on -CURRENT

Sponsored by:	Beckhoff Automation GmbH & Co. KG

graphics/drm-6{1,6}-kmod: Fix build on current

Update the port to have code dealing with change in BUS_ALLOC_RESOURCE

Sponsored by:	Beckhoff Automation GMbH & Co. KG

graphics/drm-*-kmod: Update DRM drivers to include an optimisation for AMD GPUs

This fixes important slowdowns with AMD GPUs after several hours of
uptime.

The optimisation was submitted by Olivier Cerner <olce@FreeBSD.org> in
the following pull request:
https://github.com/freebsd/drm-kmod/pull/377

The optimisation was submitted to all supported DRM driver version, from
5.10 to 6.6. The corresponding NVIDIA DRM ports were adapted at the same
time accordingly.

drm: Clean up comments

Reviewed by: emaste, ivy, Tomoaki AOKI <junchoon@dec.sakura.ne.jp>

graphics/drm-66-kmod: Update to drm_v6.6.25_6

This change brings some cleanup to the FreeBSD-specific code. This also
solves a conflict with upcoming changes to linuxkpi.

See https://github.com/freebsd/drm-kmod/pull/368.

Sponsored by:	The FreeBSD Foundation

graphics/drm-66-kmod: Update to drm_v6.6.25_5

This update fixes GPU acceleration when switching to VT and back to Xorg.

PR:             271995
Sponsored by:   Beckhoff Automation GmbH & Co. KG

graphics/drm-66-kmod: Improve pkg-descr, bring it in line with the Makefile
check

Pull Request:	https://github.com/freebsd/freebsd-ports/pull/372

graphics/drm-66-kmod: Fix port name in pkg-message

I'm specifically not bumping the PORTREVISION as the change in mostly
cosmetic.

Approved by:	portmgr (blanket)
Fixes:		00508c01e276 graphics/drm-66-kmod: Add new port

graphics/drm-66-kmod: Update to drm_v6.6.25_4

Fixes issues with explicit fence and linux jiffies.

PR:             286311
Sponsored by:   Beckhoff Automation GmbH & Co. KG

graphics/drm-66-kmod: Update to drm_v6.6.25_3

Fix compile on FreeBSD-CURRENT.

Sponsored by:   Beckhoff Automation GmbH & Co. KG

graphics/drm-66-kmod: Update to drm_v6.6.25_2

This exports all symbols from the modules.
See
https://github.com/freebsd/drm-kmod/commit/81f4ddf1c1a5041769f1376e027fa1751df6c292
for the explaination.

Sponsored by:   Beckhoff Automation GmbH & Co. KG

graphics/drm-66-kmod: Fix conflict

WHile here add the conflict in all drm kmod ports for drm-66-kmod.

Reported by:	Alonso Cárdenas Márquez <acm@FreeBSD.org>
Fixes:		00508c01e276 ("graphics/drm-66-kmod: Add new port")
Sponsored by:	Beckhoff Automation GmbH & Co. KG

graphics/drm-66-kmod: Add new port

Add drm-66-kmod which tracks linux 6.6-lts.
Currently synced with 6.6.25

Sponsored by:	Beckhoff Automation GmbH & Co. KG