Re: [PATCH v5 3/3] PCI: qcom: Add retry logic for link to be stable in L1ss

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

Hi Krishna,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on helgaas-pci/next]
[also build test WARNING on next-20220803]
[cannot apply to linus/master v5.19]
[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/Krishna-chaitanya-chundru/PCI-Restrict-pci-transactions-after-pci-suspend/20220803-193033
base:   https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git next
config: mips-allyesconfig (https://download.01.org/0day-ci/archive/20220804/202208041821.cik847re-lkp@intel.com/config)
compiler: mips-linux-gcc (GCC) 12.1.0
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/64b4ad561ad4a28aa8840303f29669bf7af77757
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Krishna-chaitanya-chundru/PCI-Restrict-pci-transactions-after-pci-suspend/20220803-193033
        git checkout 64b4ad561ad4a28aa8840303f29669bf7af77757
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=mips SHELL=/bin/bash drivers/pci/controller/dwc/

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 >>):

   In file included from include/linux/device.h:15,
                    from include/linux/node.h:18,
                    from include/linux/cpu.h:17,
                    from include/linux/of_device.h:5,
                    from drivers/pci/controller/dwc/pcie-qcom.c:20:
   drivers/pci/controller/dwc/pcie-qcom.c: In function 'qcom_pcie_pm_suspend':
>> drivers/pci/controller/dwc/pcie-qcom.c:1846:39: warning: format '%d' expects argument of type 'int', but argument 3 has type 's64' {aka 'long long int'} [-Wformat=]
    1846 |                         dev_info(dev, "Link enters L1ss after %d ms\n",
         |                                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/dev_printk.h:110:30: note: in definition of macro 'dev_printk_index_wrap'
     110 |                 _p_func(dev, fmt, ##__VA_ARGS__);                       \
         |                              ^~~
   include/linux/dev_printk.h:150:58: note: in expansion of macro 'dev_fmt'
     150 |         dev_printk_index_wrap(_dev_info, KERN_INFO, dev, dev_fmt(fmt), ##__VA_ARGS__)
         |                                                          ^~~~~~~
   drivers/pci/controller/dwc/pcie-qcom.c:1846:25: note: in expansion of macro 'dev_info'
    1846 |                         dev_info(dev, "Link enters L1ss after %d ms\n",
         |                         ^~~~~~~~
   drivers/pci/controller/dwc/pcie-qcom.c:1846:64: note: format string is defined here
    1846 |                         dev_info(dev, "Link enters L1ss after %d ms\n",
         |                                                               ~^
         |                                                                |
         |                                                                int
         |                                                               %lld


vim +1846 drivers/pci/controller/dwc/pcie-qcom.c

  1827	
  1828	static int __maybe_unused qcom_pcie_pm_suspend(struct device *dev)
  1829	{
  1830		struct qcom_pcie *pcie = dev_get_drvdata(dev);
  1831		u32 val;
  1832		ktime_t timeout, start;
  1833	
  1834		if (!pcie->cfg->supports_system_suspend)
  1835			return 0;
  1836	
  1837		start = ktime_get();
  1838		/* Wait max 100 ms */
  1839		timeout = ktime_add_ms(start, 100);
  1840		while (1) {
  1841			bool timedout = ktime_after(ktime_get(), timeout);
  1842	
  1843			/* if the link is not in l1ss don't turn off clocks */
  1844			val = readl(pcie->parf + PCIE20_PARF_PM_STTS);
  1845			if ((val & PCIE20_PARF_PM_STTS_LINKST_IN_L1SUB)) {
> 1846				dev_info(dev, "Link enters L1ss after %d ms\n",
  1847						ktime_to_ms(ktime_get() - start));
  1848				break;
  1849			}
  1850	
  1851			if (timedout) {
  1852				dev_warn(dev, "Link is not in L1ss\n");
  1853				return 0;
  1854			}
  1855			usleep_range(1000, 1200);
  1856		}
  1857	
  1858		if (pcie->cfg->ops->suspend)
  1859			pcie->cfg->ops->suspend(pcie);
  1860	
  1861		pcie->is_suspended = true;
  1862	
  1863		return 0;
  1864	}
  1865	

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