Re: [PATCH v5 3/5] media: i2c: add driver for the SK Hynix Hi-846 8M pixel camera

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Hi Martin,

I love your patch! Yet something to improve:

[auto build test ERROR on linuxtv-media/master]
[also build test ERROR on next-20210617]
[cannot apply to robh/for-next arm64/for-next/core linus/master v5.13-rc6]
[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/Martin-Kepplinger/Add-support-for-the-Hynix-Hi-846-camera/20210616-213802
base:   git://linuxtv.org/media_tree.git master
config: powerpc64-randconfig-r002-20210618 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 64720f57bea6a6bf033feef4a5751ab9c0c3b401)
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 powerpc64 cross compiling tool for clang build
        # apt-get install binutils-powerpc64-linux-gnu
        # https://github.com/0day-ci/linux/commit/a6a93a98f579077a210a432a360082e4382f531a
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Martin-Kepplinger/Add-support-for-the-Hynix-Hi-846-camera/20210616-213802
        git checkout a6a93a98f579077a210a432a360082e4382f531a
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64 

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

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

   In file included from drivers/media/i2c/hi846.c:13:
   In file included from include/linux/regulator/consumer.h:35:
   In file included from include/linux/suspend.h:5:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:13:
   In file included from include/linux/cgroup.h:26:
   In file included from include/linux/kernel_stat.h:9:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from arch/powerpc/include/asm/hardirq.h:6:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/powerpc/include/asm/io.h:619:
   arch/powerpc/include/asm/io-defs.h:47:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
   DEF_PCI_AC_NORET(insl, (unsigned long p, void *b, unsigned long c),
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:182:1: note: expanded from here
   __do_insl
   ^
   arch/powerpc/include/asm/io.h:558:56: note: expanded from macro '__do_insl'
   #define __do_insl(p, b, n)      readsl((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
                                          ~~~~~~~~~~~~~~~~~~~~~^
   In file included from drivers/media/i2c/hi846.c:13:
   In file included from include/linux/regulator/consumer.h:35:
   In file included from include/linux/suspend.h:5:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:13:
   In file included from include/linux/cgroup.h:26:
   In file included from include/linux/kernel_stat.h:9:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from arch/powerpc/include/asm/hardirq.h:6:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/powerpc/include/asm/io.h:619:
   arch/powerpc/include/asm/io-defs.h:49:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
   DEF_PCI_AC_NORET(outsb, (unsigned long p, const void *b, unsigned long c),
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:184:1: note: expanded from here
   __do_outsb
   ^
   arch/powerpc/include/asm/io.h:559:58: note: expanded from macro '__do_outsb'
   #define __do_outsb(p, b, n)     writesb((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
                                           ~~~~~~~~~~~~~~~~~~~~~^
   In file included from drivers/media/i2c/hi846.c:13:
   In file included from include/linux/regulator/consumer.h:35:
   In file included from include/linux/suspend.h:5:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:13:
   In file included from include/linux/cgroup.h:26:
   In file included from include/linux/kernel_stat.h:9:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from arch/powerpc/include/asm/hardirq.h:6:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/powerpc/include/asm/io.h:619:
   arch/powerpc/include/asm/io-defs.h:51:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
   DEF_PCI_AC_NORET(outsw, (unsigned long p, const void *b, unsigned long c),
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:186:1: note: expanded from here
   __do_outsw
   ^
   arch/powerpc/include/asm/io.h:560:58: note: expanded from macro '__do_outsw'
   #define __do_outsw(p, b, n)     writesw((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
                                           ~~~~~~~~~~~~~~~~~~~~~^
   In file included from drivers/media/i2c/hi846.c:13:
   In file included from include/linux/regulator/consumer.h:35:
   In file included from include/linux/suspend.h:5:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:13:
   In file included from include/linux/cgroup.h:26:
   In file included from include/linux/kernel_stat.h:9:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from arch/powerpc/include/asm/hardirq.h:6:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/powerpc/include/asm/io.h:619:
   arch/powerpc/include/asm/io-defs.h:53:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
   DEF_PCI_AC_NORET(outsl, (unsigned long p, const void *b, unsigned long c),
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:188:1: note: expanded from here
   __do_outsl
   ^
   arch/powerpc/include/asm/io.h:561:58: note: expanded from macro '__do_outsl'
   #define __do_outsl(p, b, n)     writesl((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
                                           ~~~~~~~~~~~~~~~~~~~~~^
>> drivers/media/i2c/hi846.c:1489:2: warning: comparison of distinct pointer types ('typeof ((link_freq)) *' (aka 'long long *') and 'uint64_t *' (aka 'unsigned long long *')) [-Wcompare-distinct-pointer-types]
           do_div(link_freq, fps);
           ^~~~~~~~~~~~~~~~~~~~~~
   include/asm-generic/div64.h:228:28: note: expanded from macro 'do_div'
           (void)(((typeof((n)) *)0) == ((uint64_t *)0));  \
                  ~~~~~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~~
>> drivers/media/i2c/hi846.c:1491:2: warning: comparison of distinct pointer types ('typeof ((frame_length)) *' (aka 'int *') and 'uint64_t *' (aka 'unsigned long long *')) [-Wcompare-distinct-pointer-types]
           do_div(frame_length, HI846_LINE_LENGTH);
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/asm-generic/div64.h:228:28: note: expanded from macro 'do_div'
           (void)(((typeof((n)) *)0) == ((uint64_t *)0));  \
                  ~~~~~~~~~~~~~~~~~~ ^  ~~~~~~~~~~~~~~~
>> drivers/media/i2c/hi846.c:1491:2: error: incompatible pointer types passing 'int *' to parameter of type 'uint64_t *' (aka 'unsigned long long *') [-Werror,-Wincompatible-pointer-types]
           do_div(frame_length, HI846_LINE_LENGTH);
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/asm-generic/div64.h:245:22: note: expanded from macro 'do_div'
                   __rem = __div64_32(&(n), __base);       \
                                      ^~~~
   include/asm-generic/div64.h:219:38: note: passing argument to parameter 'dividend' here
   extern uint32_t __div64_32(uint64_t *dividend, uint32_t divisor);
                                        ^
>> drivers/media/i2c/hi846.c:1491:2: warning: shift count >= width of type [-Wshift-count-overflow]
           do_div(frame_length, HI846_LINE_LENGTH);
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/asm-generic/div64.h:241:25: note: expanded from macro 'do_div'
           } else if (likely(((n) >> 32) == 0)) {          \
                                  ^  ~~
   include/linux/compiler.h:77:40: note: expanded from macro 'likely'
   # define likely(x)      __builtin_expect(!!(x), 1)
                                               ^
>> drivers/media/i2c/hi846.c:1529:26: warning: address of 'hi846->cur_mode->reg_list_2lane' will always evaluate to 'true' [-Wpointer-bool-conversion]
                   if (!&hi846->cur_mode->reg_list_2lane) {
                       ~ ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~
>> drivers/media/i2c/hi846.c:1535:26: warning: address of 'hi846->cur_mode->reg_list_4lane' will always evaluate to 'true' [-Wpointer-bool-conversion]
                   if (!&hi846->cur_mode->reg_list_4lane) {
                       ~ ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~
   12 warnings and 1 error generated.


vim +1491 drivers/media/i2c/hi846.c

  1477	
  1478	static int hi846_set_video_mode(struct hi846 *hi846, int fps)
  1479	{
  1480		struct i2c_client *client = v4l2_get_subdevdata(&hi846->sd);
  1481		int frame_length;
  1482		int ret = 0;
  1483		int dummy_lines;
  1484		s64 link_freq = hi846_get_link_freq(hi846);
  1485	
  1486		dev_dbg(&client->dev, "%s: link freq: %lld\n", __func__,
  1487			hi846_get_link_freq(hi846));
  1488	
> 1489		do_div(link_freq, fps);
  1490		frame_length = link_freq;
> 1491		do_div(frame_length, HI846_LINE_LENGTH);
  1492	
  1493		dummy_lines = (frame_length > hi846->cur_mode->frame_len) ?
  1494				(frame_length - hi846->cur_mode->frame_len) : 0;
  1495	
  1496		frame_length = hi846->cur_mode->frame_len + dummy_lines;
  1497	
  1498		dev_dbg(&client->dev, "%s: frame length calculated: %d\n", __func__,
  1499			frame_length);
  1500	
  1501		hi846_write_reg_16(hi846, HI846_REG_FLL, frame_length & 0xFFFF, &ret);
  1502		hi846_write_reg_16(hi846, HI846_REG_LLP, HI846_LINE_LENGTH & 0xFFFF, &ret);
  1503	
  1504		return ret;
  1505	}
  1506	
  1507	static int hi846_start_streaming(struct hi846 *hi846)
  1508	{
  1509		struct i2c_client *client = v4l2_get_subdevdata(&hi846->sd);
  1510		int ret = 0;
  1511		u8 val;
  1512	
  1513		if (hi846->nr_lanes == 2)
  1514			ret = hi846_write_reg_list(hi846, &hi846_init_regs_list_2lane);
  1515		else
  1516			ret = hi846_write_reg_list(hi846, &hi846_init_regs_list_4lane);
  1517		if (ret) {
  1518			dev_err(&client->dev, "failed to set plls: %d\n", ret);
  1519			return ret;
  1520		}
  1521	
  1522		ret = hi846_write_reg_list(hi846, &hi846->cur_mode->reg_list_config);
  1523		if (ret) {
  1524			dev_err(&client->dev, "failed to set mode: %d\n", ret);
  1525			return ret;
  1526		}
  1527	
  1528		if (hi846->nr_lanes == 2) {
> 1529			if (!&hi846->cur_mode->reg_list_2lane) {
  1530				dev_err(&client->dev, "2 lanes unsupported for this mode\n");
  1531				return -EINVAL;
  1532			}
  1533			ret = hi846_write_reg_list(hi846, &hi846->cur_mode->reg_list_2lane);
  1534		} else {
> 1535			if (!&hi846->cur_mode->reg_list_4lane) {
  1536				dev_err(&client->dev, "4 lanes unsupported for this mode\n");
  1537				return -EINVAL;
  1538			}
  1539			ret = hi846_write_reg_list(hi846, &hi846->cur_mode->reg_list_4lane);
  1540		}
  1541		if (ret) {
  1542			dev_err(&client->dev, "failed to set mipi mode: %d\n", ret);
  1543			return ret;
  1544		}
  1545	
  1546		hi846_set_video_mode(hi846, hi846->cur_mode->fps);
  1547	
  1548		ret = __v4l2_ctrl_handler_setup(hi846->sd.ctrl_handler);
  1549		if (ret)
  1550			return ret;
  1551	
  1552		/*
  1553		 * Reading 0x0034 is purely done for debugging reasons: It is not
  1554		 * documented in the DS but only mentioned once:
  1555		 * "If 0x0034[2] bit is disabled , Visible pixel width and height is 0."
  1556		 * So even though that sounds like we won't see anything, we don't
  1557		 * know more about this, so in that case only inform the user but do
  1558		 * nothing more.
  1559		 */
  1560		ret = hi846_read_reg(hi846, 0x0034, &val);
  1561		if (ret)
  1562			return ret;
  1563		if (!(val & BIT(2)))
  1564			dev_info(&client->dev, "visible pixel width and height is 0\n");
  1565	
  1566		ret = hi846_write_reg(hi846, HI846_REG_MODE_SELECT,
  1567				      HI846_MODE_STREAMING);
  1568		if (ret) {
  1569			dev_err(&client->dev, "failed to start stream");
  1570			return ret;
  1571		}
  1572	
  1573		hi846->streaming = 1;
  1574	
  1575		dev_dbg(&client->dev, "%s: started streaming successfully\n", __func__);
  1576	
  1577		return ret;
  1578	}
  1579	

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

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