Hi AngeloGioacchino,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on drm/drm-next]
[also build test WARNING on v5.15-rc7 next-20211029]
[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/AngeloGioacchino-Del-Regno/drm-bridge-parade-ps8640-Don-t-try-to-enable-VDO-if-poweron-fails/20211029-212903
base:   git://anongit.freedesktop.org/drm/drm drm-next
config: arm-randconfig-r012-20211029 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 5db7568a6a1fcb408eb8988abdaff2a225a8eb72)
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
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/0day-ci/linux/commit/a04870beda522c60c8604006667038a096f1cbd4
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review AngeloGioacchino-Del-Regno/drm-bridge-parade-ps8640-Don-t-try-to-enable-VDO-if-poweron-fails/20211029-212903
        git checkout a04870beda522c60c8604006667038a096f1cbd4
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm 

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

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/bridge/parade-ps8640.c:304:47: warning: variable 'ret' is uninitialized when used here [-Wuninitialized]
                   DRM_ERROR("cannot disable regulators %d\n", ret);
                                                               ^~~
   include/drm/drm_print.h:518:19: note: expanded from macro 'DRM_ERROR'
           __drm_err(fmt, ##__VA_ARGS__)
                            ^~~~~~~~~~~
   drivers/gpu/drm/bridge/parade-ps8640.c:298:9: note: initialize the variable 'ret' to silence this warning
           int ret;
                  ^
                   = 0
   1 warning generated.


vim +/ret +304 drivers/gpu/drm/bridge/parade-ps8640.c

   295	
   296	static void __ps8640_bridge_poweroff(struct ps8640 *ps_bridge)
   297	{
   298		int ret;
   299	
   300		gpiod_set_value(ps_bridge->gpio_reset, 1);
   301		gpiod_set_value(ps_bridge->gpio_powerdown, 1);
   302		if (regulator_bulk_disable(ARRAY_SIZE(ps_bridge->supplies),
   303					   ps_bridge->supplies)) {
 > 304			DRM_ERROR("cannot disable regulators %d\n", ret);
   305		}
   306	}
   307	

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