[PATCH 3/4] Restructure output format computation for better expandability

[kernel test robot]

Hi Werner,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on drm-intel/for-linux-next]
[also build test ERROR on next-20210503]
[cannot apply to v5.12]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Werner-Sembach/drm-i915-display-Try-YCbCr420-color-when-RGB-fails/20210504-022344
base:   git://anongit.freedesktop.org/drm-intel for-linux-next
config: i386-randconfig-m021-20210503 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/8ff372234cbfe66eb5a59c2cda6a44961f5a9266
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Werner-Sembach/drm-i915-display-Try-YCbCr420-color-when-RGB-fails/20210504-022344
        git checkout 8ff372234cbfe66eb5a59c2cda6a44961f5a9266
        # save the attached .config to linux build tree
        make W=1 W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp at intel.com>

All errors (new ones prefixed by >>):

>> drivers/gpu/drm/i915/display/intel_hdmi.c:2108:5: error: no previous prototype for 'intel_hdmi_compute_output_format' [-Werror=missing-prototypes]
    2108 | int intel_hdmi_compute_output_format(struct intel_encoder *encoder,
         |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors


vim +/intel_hdmi_compute_output_format +2108 drivers/gpu/drm/i915/display/intel_hdmi.c

  2107	
> 2108	int intel_hdmi_compute_output_format(struct intel_encoder *encoder,
  2109					     struct intel_crtc_state *crtc_state,
  2110					     const struct drm_connector_state *conn_state)
  2111	{
  2112		const struct drm_connector *connector = conn_state->connector;
  2113		const struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
  2114		int ret;
  2115	
  2116		if (connector->ycbcr_420_allowed && drm_mode_is_420_only(&connector->display_info, adjusted_mode))
  2117			crtc_state->output_format = INTEL_OUTPUT_FORMAT_YCBCR420;
  2118		else
  2119			crtc_state->output_format = INTEL_OUTPUT_FORMAT_RGB;
  2120	
  2121		ret = intel_hdmi_compute_clock(encoder, crtc_state);
  2122	
  2123		return ret;
  2124	}
  2125	

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