Re: [PATCH V3 7/9] usb: dwc2: Refactor backup/restore of registers

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Hi Stefan,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on arm/for-next arm/fixes v6.11-rc4 next-20240822]
[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/Stefan-Wahren/mailbox-bcm2835-Fix-timeout-during-suspend-mode/20240822-063725
base:   linus/master
patch link:    https://lore.kernel.org/r/20240821214052.6800-8-wahrenst%40gmx.net
patch subject: [PATCH V3 7/9] usb: dwc2: Refactor backup/restore of registers
config: x86_64-randconfig-161-20240822 (https://download.01.org/0day-ci/archive/20240822/202408221629.jv9AgCrF-lkp@xxxxxxxxx/config)
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240822/202408221629.jv9AgCrF-lkp@xxxxxxxxx/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202408221629.jv9AgCrF-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> drivers/usb/dwc2/gadget.c:5605:28: warning: variable 'dr' set but not used [-Wunused-but-set-variable]
    5605 |         struct dwc2_dregs_backup *dr;
         |                                   ^
   1 warning generated.


vim +/dr +5605 drivers/usb/dwc2/gadget.c

be2b960e57154a Artur Petrosyan 2021-04-08  5588  
be2b960e57154a Artur Petrosyan 2021-04-08  5589  /*
be2b960e57154a Artur Petrosyan 2021-04-08  5590   * dwc2_gadget_exit_partial_power_down() - Exit controller from device partial
be2b960e57154a Artur Petrosyan 2021-04-08  5591   * power down.
be2b960e57154a Artur Petrosyan 2021-04-08  5592   *
be2b960e57154a Artur Petrosyan 2021-04-08  5593   * @hsotg: Programming view of the DWC_otg controller
be2b960e57154a Artur Petrosyan 2021-04-08  5594   * @restore: indicates whether need to restore the registers or not.
be2b960e57154a Artur Petrosyan 2021-04-08  5595   *
be2b960e57154a Artur Petrosyan 2021-04-08  5596   * Return: non-zero if failed to exit device partial power down.
be2b960e57154a Artur Petrosyan 2021-04-08  5597   *
be2b960e57154a Artur Petrosyan 2021-04-08  5598   * This function is for exiting from device mode partial power down.
be2b960e57154a Artur Petrosyan 2021-04-08  5599   */
be2b960e57154a Artur Petrosyan 2021-04-08  5600  int dwc2_gadget_exit_partial_power_down(struct dwc2_hsotg *hsotg,
be2b960e57154a Artur Petrosyan 2021-04-08  5601  					bool restore)
be2b960e57154a Artur Petrosyan 2021-04-08  5602  {
be2b960e57154a Artur Petrosyan 2021-04-08  5603  	u32 pcgcctl;
be2b960e57154a Artur Petrosyan 2021-04-08  5604  	u32 dctl;
be2b960e57154a Artur Petrosyan 2021-04-08 @5605  	struct dwc2_dregs_backup *dr;
be2b960e57154a Artur Petrosyan 2021-04-08  5606  	int ret = 0;
be2b960e57154a Artur Petrosyan 2021-04-08  5607  
be2b960e57154a Artur Petrosyan 2021-04-08  5608  	dr = &hsotg->dr_backup;
be2b960e57154a Artur Petrosyan 2021-04-08  5609  
be2b960e57154a Artur Petrosyan 2021-04-08  5610  	dev_dbg(hsotg->dev, "Exiting device partial Power Down started.\n");
be2b960e57154a Artur Petrosyan 2021-04-08  5611  
be2b960e57154a Artur Petrosyan 2021-04-08  5612  	pcgcctl = dwc2_readl(hsotg, PCGCTL);
be2b960e57154a Artur Petrosyan 2021-04-08  5613  	pcgcctl &= ~PCGCTL_STOPPCLK;
be2b960e57154a Artur Petrosyan 2021-04-08  5614  	dwc2_writel(hsotg, pcgcctl, PCGCTL);
be2b960e57154a Artur Petrosyan 2021-04-08  5615  
be2b960e57154a Artur Petrosyan 2021-04-08  5616  	pcgcctl = dwc2_readl(hsotg, PCGCTL);
be2b960e57154a Artur Petrosyan 2021-04-08  5617  	pcgcctl &= ~PCGCTL_PWRCLMP;
be2b960e57154a Artur Petrosyan 2021-04-08  5618  	dwc2_writel(hsotg, pcgcctl, PCGCTL);
be2b960e57154a Artur Petrosyan 2021-04-08  5619  
be2b960e57154a Artur Petrosyan 2021-04-08  5620  	pcgcctl = dwc2_readl(hsotg, PCGCTL);
be2b960e57154a Artur Petrosyan 2021-04-08  5621  	pcgcctl &= ~PCGCTL_RSTPDWNMODULE;
be2b960e57154a Artur Petrosyan 2021-04-08  5622  	dwc2_writel(hsotg, pcgcctl, PCGCTL);
be2b960e57154a Artur Petrosyan 2021-04-08  5623  
be2b960e57154a Artur Petrosyan 2021-04-08  5624  	udelay(100);
be2b960e57154a Artur Petrosyan 2021-04-08  5625  	if (restore) {
78c09c66698a77 Stefan Wahren   2024-08-21  5626  		ret = dwc2_gadget_restore_critical_registers(hsotg);
78c09c66698a77 Stefan Wahren   2024-08-21  5627  		if (ret)
be2b960e57154a Artur Petrosyan 2021-04-08  5628  			return ret;
be2b960e57154a Artur Petrosyan 2021-04-08  5629  	}
be2b960e57154a Artur Petrosyan 2021-04-08  5630  
be2b960e57154a Artur Petrosyan 2021-04-08  5631  	/* Set the Power-On Programming done bit */
be2b960e57154a Artur Petrosyan 2021-04-08  5632  	dctl = dwc2_readl(hsotg, DCTL);
be2b960e57154a Artur Petrosyan 2021-04-08  5633  	dctl |= DCTL_PWRONPRGDONE;
be2b960e57154a Artur Petrosyan 2021-04-08  5634  	dwc2_writel(hsotg, dctl, DCTL);
be2b960e57154a Artur Petrosyan 2021-04-08  5635  
be2b960e57154a Artur Petrosyan 2021-04-08  5636  	/* Set in_ppd flag to 0 as here core exits from suspend. */
be2b960e57154a Artur Petrosyan 2021-04-08  5637  	hsotg->in_ppd = 0;
be2b960e57154a Artur Petrosyan 2021-04-08  5638  	hsotg->lx_state = DWC2_L0;
be2b960e57154a Artur Petrosyan 2021-04-08  5639  
be2b960e57154a Artur Petrosyan 2021-04-08  5640  	dev_dbg(hsotg->dev, "Exiting device partial Power Down completed.\n");
be2b960e57154a Artur Petrosyan 2021-04-08  5641  	return ret;
be2b960e57154a Artur Petrosyan 2021-04-08  5642  }
012466fc8ccc01 Artur Petrosyan 2021-04-13  5643  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki




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