Hi Neil,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.5 next-20200207]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Neil-Armstrong/drm-bridge-dw-hdmi-implement-bus-format-negotiation-and-YUV420-support/20200209-150729
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git d4f309ca411887cd61ea389c7abfb70c2eb1e532
config: openrisc-randconfig-a001-20200209 (attached as .config)
compiler: or1k-linux-gcc (GCC) 9.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=9.2.0 make.cross ARCH=openrisc 

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

All errors (new ones prefixed by >>):

>> drivers/gpu/drm/bridge/synopsys/dw-hdmi.c:2497:3: error: 'const struct drm_bridge_funcs' has no member named 'atomic_duplicate_state'
    2497 |  .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
         |   ^~~~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/bridge/synopsys/dw-hdmi.c:2497:28: error: 'drm_atomic_helper_bridge_duplicate_state' undeclared here (not in a function); did you mean 'drm_atomic_helper_plane_duplicate_state'?
    2497 |  .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
         |                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         |                            drm_atomic_helper_plane_duplicate_state
>> drivers/gpu/drm/bridge/synopsys/dw-hdmi.c:2498:3: error: 'const struct drm_bridge_funcs' has no member named 'atomic_destroy_state'
    2498 |  .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
         |   ^~~~~~~~~~~~~~~~~~~~
   drivers/gpu/drm/bridge/synopsys/dw-hdmi.c:2498:26: error: 'drm_atomic_helper_bridge_destroy_state' undeclared here (not in a function); did you mean 'drm_atomic_helper_plane_destroy_state'?
    2498 |  .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
         |                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         |                          drm_atomic_helper_plane_destroy_state
>> drivers/gpu/drm/bridge/synopsys/dw-hdmi.c:2499:3: error: 'const struct drm_bridge_funcs' has no member named 'atomic_reset'
    2499 |  .atomic_reset = drm_atomic_helper_bridge_reset,
         |   ^~~~~~~~~~~~
   drivers/gpu/drm/bridge/synopsys/dw-hdmi.c:2499:18: error: 'drm_atomic_helper_bridge_reset' undeclared here (not in a function); did you mean 'drm_atomic_helper_plane_reset'?
    2499 |  .atomic_reset = drm_atomic_helper_bridge_reset,
         |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         |                  drm_atomic_helper_plane_reset

vim +2497 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c

  2495	
  2496	static const struct drm_bridge_funcs dw_hdmi_bridge_funcs = {
> 2497		.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
> 2498		.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
> 2499		.atomic_reset = drm_atomic_helper_bridge_reset,
  2500		.attach = dw_hdmi_bridge_attach,
  2501		.detach = dw_hdmi_bridge_detach,
  2502		.enable = dw_hdmi_bridge_enable,
  2503		.disable = dw_hdmi_bridge_disable,
  2504		.mode_set = dw_hdmi_bridge_mode_set,
  2505		.mode_valid = dw_hdmi_bridge_mode_valid,
  2506	};
  2507	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org