[Intel-gfx] [PATCH] drm/i915: Support FP16 compressed formats on MTL

[Dan Carpenter]

Hi Melanie,

kernel test robot noticed the following build warnings:

url:    https://github.com/intel-lab-lkp/linux/commits/Melanie-Lobo/drm-i915-Support-FP16-compressed-formats-on-MTL/20231011-181214
base:   git://anongit.freedesktop.org/drm/drm-tip drm-tip
patch link:    https://lore.kernel.org/r/20231011102356.22014-1-melanie.lobo%40intel.com
patch subject: [Intel-gfx] [PATCH] drm/i915: Support FP16 compressed formats on MTL
config: x86_64-randconfig-161-20231015 (https://download.01.org/0day-ci/archive/20231015/202310150454.S9QF86bl-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce: (https://download.01.org/0day-ci/archive/20231015/202310150454.S9QF86bl-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp at intel.com>
| Reported-by: Dan Carpenter <dan.carpenter at linaro.org>
| Closes: https://lore.kernel.org/r/202310150454.S9QF86bl-lkp@intel.com/

smatch warnings:
drivers/gpu/drm/i915/display/skl_universal_plane.c:2126 gen12_plane_format_mod_supported() warn: ignoring unreachable code.

vim +2126 drivers/gpu/drm/i915/display/skl_universal_plane.c

46d12f911821f7 Dave Airlie           2021-02-05  2120  	case DRM_FORMAT_Y210:
46d12f911821f7 Dave Airlie           2021-02-05  2121  	case DRM_FORMAT_Y212:
46d12f911821f7 Dave Airlie           2021-02-05  2122  	case DRM_FORMAT_Y216:
46d12f911821f7 Dave Airlie           2021-02-05  2123  	case DRM_FORMAT_XVYU12_16161616:
46d12f911821f7 Dave Airlie           2021-02-05  2124  	case DRM_FORMAT_XVYU16161616:
46d12f911821f7 Dave Airlie           2021-02-05  2125  		return true;
46d12f911821f7 Dave Airlie           2021-02-05 @2126  		fallthrough;

This fallthrough annotation is incorrect.

46d12f911821f7 Dave Airlie           2021-02-05  2127  	default:
46d12f911821f7 Dave Airlie           2021-02-05  2128  		return false;
46d12f911821f7 Dave Airlie           2021-02-05  2129  	}
46d12f911821f7 Dave Airlie           2021-02-05  2130  }

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https://github.com/intel/lkp-tests/wiki