[PATCH] drm/mediatek: add dsi module reset driver

[kbuild test robot]

Hi Jitao,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.1 next-20190517]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Jitao-Shi/drm-mediatek-add-dsi-module-reset-driver/20190519-214457
config: arm64-allyesconfig (attached as .config)
compiler: aarch64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
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=7.2.0 make.cross ARCH=arm64 

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

All warnings (new ones prefixed by >>):

   In file included from drivers/gpu//drm/mediatek/mtk_dsi.c:29:0:
   drivers/gpu//drm/mediatek/mtk_dsi.c: In function 'mtk_dsi_reset_all':
>> drivers/gpu//drm/mediatek/mtk_dsi.c:250:27: warning: large integer implicitly truncated to unsigned type [-Woverflow]
          MMSYS_SW_RST_DSI_B, ~MMSYS_SW_RST_DSI_B);
                              ^
   include/linux/regmap.h:77:42: note: in definition of macro 'regmap_update_bits'
     regmap_update_bits_base(map, reg, mask, val, NULL, false, false)
                                             ^~~

vim +250 drivers/gpu//drm/mediatek/mtk_dsi.c

   246	
   247	static void mtk_dsi_reset_all(struct mtk_dsi *dsi)
   248	{
   249		regmap_update_bits(dsi->mmsys_sw_rst_b, dsi->sw_rst_b,
 > 250				   MMSYS_SW_RST_DSI_B, ~MMSYS_SW_RST_DSI_B);
   251		usleep_range(1000, 1100);
   252	
   253		regmap_update_bits(dsi->mmsys_sw_rst_b, dsi->sw_rst_b,
   254				   MMSYS_SW_RST_DSI_B, MMSYS_SW_RST_DSI_B);
   255	}
   256	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
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