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

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Date:   Fri, 5 Aug 2022 11:14:04 +0800
From:   kernel test robot <lkp@...el.com>
To:     Krishna chaitanya chundru <quic_krichai@...cinc.com>,
        helgaas@...nel.org
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-pci@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, mka@...omium.org,
        quic_vbadigan@...cinc.com, quic_hemantk@...cinc.com,
        quic_nitegupt@...cinc.com, quic_skananth@...cinc.com,
        quic_ramkri@...cinc.com, manivannan.sadhasivam@...aro.org,
        swboyd@...omium.org, dmitry.baryshkov@...aro.org,
        Krishna chaitanya chundru <quic_krichai@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Stanimir Varbanov <svarbanov@...sol.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <helgaas@...nel.org>
Subject: Re: [PATCH v5 3/3] PCI: qcom: Add retry logic for link to be stable
 in L1ss

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-20220804]
[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: arm64-randconfig-r024-20220804 (https://download.01.org/0day-ci/archive/20220805/202208051112.qnLsiuff-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 26dd42705c2af0b8f6e5d6cdb32c9bd5ed9524eb)
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 arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # 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=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/pci/controller/dwc/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

>> drivers/pci/controller/dwc/pcie-qcom.c:1847:6: warning: format specifies type 'int' but the argument has type 's64' (aka 'long long') [-Wformat]
                                           ktime_to_ms(ktime_get() - start));
                                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/dev_printk.h:150:67: note: expanded from macro 'dev_info'
           dev_printk_index_wrap(_dev_info, KERN_INFO, dev, dev_fmt(fmt), ##__VA_ARGS__)
                                                                    ~~~     ^~~~~~~~~~~
   include/linux/dev_printk.h:110:23: note: expanded from macro 'dev_printk_index_wrap'
                   _p_func(dev, fmt, ##__VA_ARGS__);                       \
                                ~~~    ^~~~~~~~~~~
   1 warning generated.


vim +1847 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