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    SubjectRe: [PATCH v7 2/4] drm/loongson: Add GPIO and I2C driver for loongson drm.
    Hi Chenyang,

    Thank you for the patch! Perhaps something to improve:

    [auto build test WARNING on drm-misc/drm-misc-next]
    [also build test WARNING on linus/master v5.19-rc3 next-20220624]
    [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/intel-lab-lkp/linux/commits/Chenyang-Li/drm-loongson-Add-DRM-Driver-for-Loongson-7A1000-bridge-chip/20220625-171037
    base: git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
    config: powerpc-allmodconfig
    compiler: powerpc-linux-gcc (GCC) 11.3.0
    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/intel-lab-lkp/linux/commit/3af56da81352153b38e05c082b8f2bf8c9fc0320
    git remote add linux-review https://github.com/intel-lab-lkp/linux
    git fetch --no-tags linux-review Chenyang-Li/drm-loongson-Add-DRM-Driver-for-Loongson-7A1000-bridge-chip/20220625-171037
    git checkout 3af56da81352153b38e05c082b8f2bf8c9fc0320
    # save the config file
    mkdir build_dir && cp config build_dir/.config
    COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash drivers/gpu/drm/loongson/

    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/loongson/loongson_encoder.c:10:27: warning: no previous prototype for 'loongson_bridge_detect' [-Wmissing-prototypes]
    10 | enum drm_connector_status loongson_bridge_detect(struct drm_bridge *bridge)
    | ^~~~~~~~~~~~~~~~~~~~~~


    vim +/loongson_bridge_detect +10 drivers/gpu/drm/loongson/loongson_encoder.c

    9
    > 10 enum drm_connector_status loongson_bridge_detect(struct drm_bridge *bridge)
    11 {
    12 unsigned char start = 0x0;
    13 struct i2c_msg msgs = {
    14 .addr = DDC_ADDR,
    15 .flags = 0,
    16 .len = 1,
    17 .buf = &start,
    18 };
    19
    20 if (i2c_transfer(bridge->ddc, &msgs, 1) != 1)
    21 return connector_status_disconnected;
    22 else
    23 return connector_status_connected;
    24 }
    25

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

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