Re: [PATCH 9/9] drm/bridge: imx: Add i.MX93 MIPI DSI support

[kernel test robot <lkp@intel.com>]

Hi Liu,

kernel test robot noticed the following build errors:

[auto build test ERROR on drm-exynos/exynos-drm-next]
[also build test ERROR on drm-intel/for-linux-next drm-intel/for-linux-next-fixes drm-tip/drm-tip linus/master v6.5-rc2 next-20230718]
[cannot apply to drm-misc/drm-misc-next drm/drm-next]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Liu-Ying/drm-bridge-synopsys-dw-mipi-dsi-Add-dw_mipi_dsi_get_bridge-helper/20230718-172247
base:   https://git.kernel.org/pub/scm/linux/kernel/git/daeinki/drm-exynos.git exynos-drm-next
patch link:    https://lore.kernel.org/r/20230717061831.1826878-10-victor.liu%40nxp.com
patch subject: [PATCH 9/9] drm/bridge: imx: Add i.MX93 MIPI DSI support
config: arm-allmodconfig (https://download.01.org/0day-ci/archive/20230719/202307190811.jOcroxF5-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230719/202307190811.jOcroxF5-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202307190811.jOcroxF5-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

   In file included from arch/arm/include/asm/div64.h:107,
                    from include/linux/math.h:6,
                    from include/linux/kernel.h:26,
                    from include/linux/clk.h:13,
                    from drivers/gpu/drm/bridge/imx/imx93-mipi-dsi.c:9:
   drivers/gpu/drm/bridge/imx/imx93-mipi-dsi.c: In function 'dphy_pll_get_configure_from_opts':
   include/asm-generic/div64.h:222:35: warning: comparison of distinct pointer types lacks a cast
     222 |         (void)(((typeof((n)) *)0) == ((uint64_t *)0));  \
         |                                   ^~
   drivers/gpu/drm/bridge/imx/imx93-mipi-dsi.c:272:17: note: in expansion of macro 'do_div'
     272 |                 do_div(tmp, n * fvco_div);
         |                 ^~~~~~
   In file included from include/linux/build_bug.h:5,
                    from include/linux/bitfield.h:10,
                    from drivers/gpu/drm/bridge/imx/imx93-mipi-dsi.c:7:
>> include/asm-generic/div64.h:234:32: warning: right shift count >= width of type [-Wshift-count-overflow]
     234 |         } else if (likely(((n) >> 32) == 0)) {          \
         |                                ^~
   include/linux/compiler.h:76:45: note: in definition of macro 'likely'
      76 | # define likely(x)      __builtin_expect(!!(x), 1)
         |                                             ^
   drivers/gpu/drm/bridge/imx/imx93-mipi-dsi.c:272:17: note: in expansion of macro 'do_div'
     272 |                 do_div(tmp, n * fvco_div);
         |                 ^~~~~~
>> include/asm-generic/div64.h:238:36: error: passing argument 1 of '__div64_32' from incompatible pointer type [-Werror=incompatible-pointer-types]
     238 |                 __rem = __div64_32(&(n), __base);       \
         |                                    ^~~~
         |                                    |
         |                                    long unsigned int *
   drivers/gpu/drm/bridge/imx/imx93-mipi-dsi.c:272:17: note: in expansion of macro 'do_div'
     272 |                 do_div(tmp, n * fvco_div);
         |                 ^~~~~~
   arch/arm/include/asm/div64.h:24:45: note: expected 'uint64_t *' {aka 'long long unsigned int *'} but argument is of type 'long unsigned int *'
      24 | static inline uint32_t __div64_32(uint64_t *n, uint32_t base)
         |                                   ~~~~~~~~~~^
   cc1: some warnings being treated as errors


vim +/__div64_32 +238 include/asm-generic/div64.h

^1da177e4c3f41 Linus Torvalds     2005-04-16  215  
^1da177e4c3f41 Linus Torvalds     2005-04-16  216  /* The unnecessary pointer compare is there
^1da177e4c3f41 Linus Torvalds     2005-04-16  217   * to check for type safety (n must be 64bit)
^1da177e4c3f41 Linus Torvalds     2005-04-16  218   */
^1da177e4c3f41 Linus Torvalds     2005-04-16  219  # define do_div(n,base) ({				\
^1da177e4c3f41 Linus Torvalds     2005-04-16  220  	uint32_t __base = (base);			\
^1da177e4c3f41 Linus Torvalds     2005-04-16  221  	uint32_t __rem;					\
^1da177e4c3f41 Linus Torvalds     2005-04-16  222  	(void)(((typeof((n)) *)0) == ((uint64_t *)0));	\
911918aa7ef6f8 Nicolas Pitre      2015-11-02  223  	if (__builtin_constant_p(__base) &&		\
911918aa7ef6f8 Nicolas Pitre      2015-11-02  224  	    is_power_of_2(__base)) {			\
911918aa7ef6f8 Nicolas Pitre      2015-11-02  225  		__rem = (n) & (__base - 1);		\
911918aa7ef6f8 Nicolas Pitre      2015-11-02  226  		(n) >>= ilog2(__base);			\
c747ce4706190e Geert Uytterhoeven 2021-08-11  227  	} else if (__builtin_constant_p(__base) &&	\
461a5e51060c93 Nicolas Pitre      2015-10-30  228  		   __base != 0) {			\
461a5e51060c93 Nicolas Pitre      2015-10-30  229  		uint32_t __res_lo, __n_lo = (n);	\
461a5e51060c93 Nicolas Pitre      2015-10-30  230  		(n) = __div64_const32(n, __base);	\
461a5e51060c93 Nicolas Pitre      2015-10-30  231  		/* the remainder can be computed with 32-bit regs */ \
461a5e51060c93 Nicolas Pitre      2015-10-30  232  		__res_lo = (n);				\
461a5e51060c93 Nicolas Pitre      2015-10-30  233  		__rem = __n_lo - __res_lo * __base;	\
911918aa7ef6f8 Nicolas Pitre      2015-11-02 @234  	} else if (likely(((n) >> 32) == 0)) {		\
^1da177e4c3f41 Linus Torvalds     2005-04-16  235  		__rem = (uint32_t)(n) % __base;		\
^1da177e4c3f41 Linus Torvalds     2005-04-16  236  		(n) = (uint32_t)(n) / __base;		\
c747ce4706190e Geert Uytterhoeven 2021-08-11  237  	} else {					\
^1da177e4c3f41 Linus Torvalds     2005-04-16 @238  		__rem = __div64_32(&(n), __base);	\
c747ce4706190e Geert Uytterhoeven 2021-08-11  239  	}						\
^1da177e4c3f41 Linus Torvalds     2005-04-16  240  	__rem;						\
^1da177e4c3f41 Linus Torvalds     2005-04-16  241   })
^1da177e4c3f41 Linus Torvalds     2005-04-16  242  

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