netdev - Re: [PATCH v2 wireless-drivers 1/2] mt76: mt76x2e: disable pcie

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Date:   Tue, 29 Oct 2019 05:33:47 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     kbuild-all@...ts.01.org, kvalo@...eaurora.org,
        linux-wireless@...r.kernel.org, nbd@....name, hkallweit1@...il.com,
        sgruszka@...hat.com, lorenzo.bianconi@...hat.com,
        oleksandr@...alenko.name, netdev@...r.kernel.org
Subject: Re: [PATCH v2 wireless-drivers 1/2] mt76: mt76x2e: disable pcie_aspm
 by default

Hi Lorenzo,

I love your patch! Yet something to improve:

[auto build test ERROR on wireless-drivers/master]

url:    https://github.com/0day-ci/linux/commits/Lorenzo-Bianconi/fix-mt76x2e-hangs-on-U7612E-mini-pcie/20191029-024127
base:   https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/wireless-drivers.git master
config: c6x-allyesconfig (attached as .config)
compiler: c6x-elf-gcc (GCC) 7.4.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.4.0 make.cross ARCH=c6x 

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

All errors (new ones prefixed by >>):

   drivers/net//wireless/mediatek/mt76/mmio.c: In function 'mt76_mmio_disable_aspm':
   drivers/net//wireless/mediatek/mt76/mmio.c:88:2: error: implicit declaration of function 'pcie_capability_read_word'; did you mean 'has_capability_noaudit'? [-Werror=implicit-function-declaration]
     pcie_capability_read_word(pdev, PCI_EXP_LNKCTL, &aspm_conf);
     ^~~~~~~~~~~~~~~~~~~~~~~~~
     has_capability_noaudit
>> drivers/net//wireless/mediatek/mt76/mmio.c:108:9: error: implicit declaration of function 'pci_disable_link_state'; did you mean 'pci_disable_ats'? [-Werror=implicit-function-declaration]
      err = pci_disable_link_state(pdev, aspm_conf);
            ^~~~~~~~~~~~~~~~~~~~~~
            pci_disable_ats
   drivers/net//wireless/mediatek/mt76/mmio.c:116:2: error: implicit declaration of function 'pcie_capability_clear_word'; did you mean 'has_capability_noaudit'? [-Werror=implicit-function-declaration]
     pcie_capability_clear_word(pdev, PCI_EXP_LNKCTL, aspm_conf);
     ^~~~~~~~~~~~~~~~~~~~~~~~~~
     has_capability_noaudit
   cc1: some warnings being treated as errors

vim +108 drivers/net//wireless/mediatek/mt76/mmio.c

    82	
    83	void mt76_mmio_disable_aspm(struct pci_dev *pdev)
    84	{
    85		struct pci_dev *parent = pdev->bus->self;
    86		u16 aspm_conf, parent_aspm_conf = 0;
    87	
  > 88		pcie_capability_read_word(pdev, PCI_EXP_LNKCTL, &aspm_conf);
    89		aspm_conf &= PCI_EXP_LNKCTL_ASPMC;
    90		if (parent) {
    91			pcie_capability_read_word(parent, PCI_EXP_LNKCTL,
    92						  &parent_aspm_conf);
    93			parent_aspm_conf &= PCI_EXP_LNKCTL_ASPMC;
    94		}
    95	
    96		if (!aspm_conf && (!parent || !parent_aspm_conf)) {
    97			/* aspm already disabled */
    98			return;
    99		}
   100	
   101		dev_info(&pdev->dev, "disabling ASPM %s %s\n",
   102			 (aspm_conf & PCI_EXP_LNKCTL_ASPM_L0S) ? "L0s" : "",
   103			 (aspm_conf & PCI_EXP_LNKCTL_ASPM_L1) ? "L1" : "");
   104	
   105		if (IS_ENABLED(CONFIG_PCIEASPM)) {
   106			int err;
   107	
 > 108			err = pci_disable_link_state(pdev, aspm_conf);
   109			if (!err)
   110				return;
   111		}
   112	
   113		/* both device and parent should have the same ASPM setting.
   114		 * disable ASPM in downstream component first and then upstream.
   115		 */
   116		pcie_capability_clear_word(pdev, PCI_EXP_LNKCTL, aspm_conf);
   117		if (parent)
   118			pcie_capability_clear_word(parent, PCI_EXP_LNKCTL,
   119						   aspm_conf);
   120	}
   121	EXPORT_SYMBOL_GPL(mt76_mmio_disable_aspm);
   122	

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