[PATCH] i3c: update dw-i3c-master i3c_clk_cfg function

[Jack Chen]

Thanks Intel kernel test robot.
I have submitted the V2 patch, which replaced max with max_t to do a type cast.


On Mon, Feb 13, 2023 at 9:13 PM kernel test robot <lkp at intel.com> wrote:
>
> Hi Jack,
>
> Thank you for the patch! Perhaps something to improve:
>
> [auto build test WARNING on linus/master]
> [also build test WARNING on v6.2-rc8 next-20230213]
> [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/Jack-Chen/i3c-update-dw-i3c-master-i3c_clk_cfg-function/20230213-222533
> patch link:    https://lore.kernel.org/r/20230213142336.192875-1-zenghuchen%40google.com
> patch subject: [PATCH] i3c: update dw-i3c-master i3c_clk_cfg function
> config: i386-randconfig-s001 (https://download.01.org/0day-ci/archive/20230214/202302141029.2CS1z9de-lkp@intel.com/config)
> compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
> reproduce:
>         # apt-get install sparse
>         # sparse version: v0.6.4-39-gce1a6720-dirty
>         # https://github.com/intel-lab-lkp/linux/commit/e85b41ae5bb17077ac7d01bdd13c48ea1f83ea42
>         git remote add linux-review https://github.com/intel-lab-lkp/linux
>         git fetch --no-tags linux-review Jack-Chen/i3c-update-dw-i3c-master-i3c_clk_cfg-function/20230213-222533
>         git checkout e85b41ae5bb17077ac7d01bdd13c48ea1f83ea42
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 olddefconfig
>         make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash drivers/i3c/master/
>
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp at intel.com>
> | Link: https://lore.kernel.org/oe-kbuild-all/202302141029.2CS1z9de-lkp@intel.com/
>
> sparse warnings: (new ones prefixed by >>)
> >> drivers/i3c/master/dw-i3c-master.c:544:16: sparse: sparse: incompatible types in comparison expression (different type sizes):
> >> drivers/i3c/master/dw-i3c-master.c:544:16: sparse:    unsigned long *
> >> drivers/i3c/master/dw-i3c-master.c:544:16: sparse:    unsigned char *
>
> vim +544 drivers/i3c/master/dw-i3c-master.c
>
>    517
>    518  static int dw_i3c_clk_cfg(struct dw_i3c_master *master)
>    519  {
>    520          unsigned long core_rate, core_period;
>    521          u32 scl_timing;
>    522          u8 hcnt, lcnt;
>    523
>    524          core_rate = clk_get_rate(master->core_clk);
>    525          if (!core_rate)
>    526                  return -EINVAL;
>    527
>    528          core_period = DIV_ROUND_UP(1000000000, core_rate);
>    529
>    530          hcnt = DIV_ROUND_UP(I3C_BUS_THIGH_MAX_NS, core_period) - 1;
>    531          if (hcnt < SCL_I3C_TIMING_CNT_MIN)
>    532                  hcnt = SCL_I3C_TIMING_CNT_MIN;
>    533
>    534          lcnt = DIV_ROUND_UP(core_rate, master->base.bus.scl_rate.i3c) - hcnt;
>    535          if (lcnt < SCL_I3C_TIMING_CNT_MIN)
>    536                  lcnt = SCL_I3C_TIMING_CNT_MIN;
>    537
>    538          scl_timing = SCL_I3C_TIMING_HCNT(hcnt) | SCL_I3C_TIMING_LCNT(lcnt);
>    539          writel(scl_timing, master->regs + SCL_I3C_PP_TIMING);
>    540
>    541          if (!(readl(master->regs + DEVICE_CTRL) & DEV_CTRL_I2C_SLAVE_PRESENT))
>    542                  writel(BUS_I3C_MST_FREE(lcnt), master->regs + BUS_FREE_TIMING);
>    543
>  > 544          lcnt = max(DIV_ROUND_UP(I3C_BUS_TLOW_OD_MIN_NS, core_period), lcnt);
>    545          scl_timing = SCL_I3C_TIMING_HCNT(hcnt) | SCL_I3C_TIMING_LCNT(lcnt);
>    546          writel(scl_timing, master->regs + SCL_I3C_OD_TIMING);
>    547
>    548          lcnt = DIV_ROUND_UP(core_rate, I3C_BUS_SDR1_SCL_RATE) - hcnt;
>    549          scl_timing = SCL_EXT_LCNT_1(lcnt);
>    550          lcnt = DIV_ROUND_UP(core_rate, I3C_BUS_SDR2_SCL_RATE) - hcnt;
>    551          scl_timing |= SCL_EXT_LCNT_2(lcnt);
>    552          lcnt = DIV_ROUND_UP(core_rate, I3C_BUS_SDR3_SCL_RATE) - hcnt;
>    553          scl_timing |= SCL_EXT_LCNT_3(lcnt);
>    554          lcnt = DIV_ROUND_UP(core_rate, I3C_BUS_SDR4_SCL_RATE) - hcnt;
>    555          scl_timing |= SCL_EXT_LCNT_4(lcnt);
>    556          writel(scl_timing, master->regs + SCL_EXT_LCNT_TIMING);
>    557
>    558          return 0;
>    559  }
>    560
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests