tree:   https://github.com/AsahiLinux/linux gpu/rust-wip
head:   bf21e26f1f1b49243f55eb850c5fd6b915f47d23
commit: da74ef0cfa2364bd6f816d0fec94f469ab250d64 [1712/2025] HACK: drm/apple: avoid DCP swaps without attached surfaces
config: arm64-allyesconfig
compiler: aarch64-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/AsahiLinux/linux/commit/da74ef0cfa2364bd6f816d0fec94f469ab250d64
        git remote add asahilinux https://github.com/AsahiLinux/linux
        git fetch --no-tags asahilinux gpu/rust-wip
        git checkout da74ef0cfa2364bd6f816d0fec94f469ab250d64
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/gpu/drm/apple/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   drivers/gpu/drm/apple/dcp.c:159:24: warning: no previous prototype for 'dcp_get_cb_channel' [-Wmissing-prototypes]
     159 | struct dcp_cb_channel *dcp_get_cb_channel(struct apple_dcp *dcp,
         |                        ^~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/apple/dcp.c:219:6: warning: no previous prototype for 'dcp_push' [-Wmissing-prototypes]
     219 | void dcp_push(struct apple_dcp *dcp, bool oob, enum dcpep_method method,
         |      ^~~~~~~~
   drivers/gpu/drm/apple/dcp.c:341:6: warning: no previous prototype for 'dcp_ack' [-Wmissing-prototypes]
     341 | void dcp_ack(struct apple_dcp *dcp, enum dcp_context_id context)
         |      ^~~~~~~
>> drivers/gpu/drm/apple/dcp.c:744:6: warning: no previous prototype for 'dcp_delayed_vblank' [-Wmissing-prototypes]
     744 | void dcp_delayed_vblank(struct work_struct *work)
         |      ^~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/apple/dcp.c:984:17: warning: no previous prototype for 'drm_to_dcp_rect' [-Wmissing-prototypes]
     984 | struct dcp_rect drm_to_dcp_rect(struct drm_rect *rect)
         |                 ^~~~~~~~~~~~~~~
   drivers/gpu/drm/apple/dcp.c: In function 'dcp_flush':
   drivers/gpu/drm/apple/dcp.c:1116:37: error: implicit declaration of function 'drm_fb_cma_get_gem_addr'; did you mean 'drm_fb_dma_get_gem_addr'? [-Werror=implicit-function-declaration]
    1116 |                 req->surf_iova[l] = drm_fb_cma_get_gem_addr(fb, new_state, 0);
         |                                     ^~~~~~~~~~~~~~~~~~~~~~~
         |                                     drm_fb_dma_get_gem_addr
   In file included from drivers/gpu/drm/apple/dcp.c:20:
   drivers/gpu/drm/apple/dcp.h: At top level:
   drivers/gpu/drm/apple/dcp.h:46:18: warning: 'dcp_formats' defined but not used [-Wunused-const-variable=]
      46 | static const u32 dcp_formats[] = {
         |                  ^~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/dcp_delayed_vblank +744 drivers/gpu/drm/apple/dcp.c

   738	
   739	/*
   740	 * Helper to send a DRM vblank event. We do not know how call swap_submit_dcp
   741	 * without surfaces. To avoid timeouts in drm_atomic_helper_wait_for_vblanks
   742	 * send a vblank event via a workqueue.
   743	 */
 > 744	void dcp_delayed_vblank(struct work_struct *work)
   745	{
   746		struct apple_dcp *dcp;
   747	
   748		dcp = container_of(work, struct apple_dcp, vblank_wq);
   749		mdelay(5);
   750		apple_crtc_vblank(dcp->crtc);
   751	}
   752	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp