Re: [Intel-gfx] [PATCH 09/11] drm/i915: Add i915_save/load_pci_state helpers

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

Hi Tilak,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on drm-tip/drm-tip]

url:    https://github.com/intel-lab-lkp/linux/commits/Tilak-Tangudu/drm-i915-Add-D3Cold-Off-support-for-runtime-pm/20220621-202453
base:   git://anongit.freedesktop.org/drm/drm-tip drm-tip
config: i386-debian-10.3-kselftests (https://download.01.org/0day-ci/archive/20220622/202206220018.NY2T7g0S-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/ad0aa2eb6293edc066466ecf3b82ce2e4e0a9636
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Tilak-Tangudu/drm-i915-Add-D3Cold-Off-support-for-runtime-pm/20220621-202453
        git checkout ad0aa2eb6293edc066466ecf3b82ce2e4e0a9636
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/gpu/drm/i915/

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 >>):

>> drivers/gpu/drm/i915/i915_driver.c:108:6: warning: no previous prototype for 'i915_save_pci_state' [-Wmissing-prototypes]
     108 | bool i915_save_pci_state(struct pci_dev *pdev)
         |      ^~~~~~~~~~~~~~~~~~~
>> drivers/gpu/drm/i915/i915_driver.c:127:6: warning: no previous prototype for 'i915_load_pci_state' [-Wmissing-prototypes]
     127 | void i915_load_pci_state(struct pci_dev *pdev)
         |      ^~~~~~~~~~~~~~~~~~~


vim +/i915_save_pci_state +108 drivers/gpu/drm/i915/i915_driver.c

   107	
 > 108	bool i915_save_pci_state(struct pci_dev *pdev)
   109	{
   110		struct drm_i915_private *i915 = pci_get_drvdata(pdev);
   111	
   112		if (pci_save_state(pdev))
   113			return false;
   114	
   115		kfree(i915->pci_state);
   116	
   117		i915->pci_state = pci_store_saved_state(pdev);
   118	
   119		if (!i915->pci_state) {
   120			drm_err(&i915->drm, "Failed to store PCI saved state\n");
   121			return false;
   122		}
   123	
   124		return true;
   125	}
   126	
 > 127	void i915_load_pci_state(struct pci_dev *pdev)
   128	{
   129		struct drm_i915_private *i915 = pci_get_drvdata(pdev);
   130		int ret;
   131	
   132		if (!i915->pci_state)
   133			return;
   134	
   135		ret = pci_load_saved_state(pdev, i915->pci_state);
   136		if (!ret) {
   137			pci_restore_state(pdev);
   138		} else {
   139			drm_warn(&i915->drm, "Failed to load PCI state, err:%d\n", ret);
   140		}
   141	}
   142	static int i915_get_bridge_dev(struct drm_i915_private *dev_priv)
   143	{
   144		int domain = pci_domain_nr(to_pci_dev(dev_priv->drm.dev)->bus);
   145	
   146		dev_priv->bridge_dev =
   147			pci_get_domain_bus_and_slot(domain, 0, PCI_DEVFN(0, 0));
   148		if (!dev_priv->bridge_dev) {
   149			drm_err(&dev_priv->drm, "bridge device not found\n");
   150			return -EIO;
   151		}
   152		return 0;
   153	}
   154	

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