[android-common:android14-kiwi-6.1 336/336] drivers/usb/dwc3/core.c:771:22: warning: variable 'hw_mode' set but not used

[android-common:android14-kiwi-6.1 336/336] drivers/usb/dwc3/core.c:771:22: warning: variable 'hw_mode' set but not used

[kernel test robot]

tree:   https://android.googlesource.com/kernel/common android14-kiwi-6.1
head:   85239205a20932568f405bb06f7dc3187e755674
commit: 9f49b974c86db9070c108e904ead1aadddb7e5a6 [336/336] BACKPORT: usb: dwc3: core: Refactor PHY logic to support Multiport Controller
config: arm64-randconfig-2000-20261018 (https://download.01.org/0day-ci/archive/20261019/202610190223.ldkcTCV3-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 11.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261019/202610190223.ldkcTCV3-lkp@intel.com/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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202610190223.ldkcTCV3-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/usb/dwc3/core.c: In function 'dwc3_hs_phy_setup':
>> drivers/usb/dwc3/core.c:771:22: warning: variable 'hw_mode' set but not used [-Wunused-but-set-variable]
     771 |         unsigned int hw_mode;
         |                      ^~~~~~~


vim +/hw_mode +771 drivers/usb/dwc3/core.c

   768	
   769	static int dwc3_hs_phy_setup(struct dwc3 *dwc, int index)
   770	{
 > 771		unsigned int hw_mode;
   772		u32 reg;
   773	
   774		hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0);
   775		reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(index));
   776	
   777		/* Select the HS PHY interface */
   778		switch (DWC3_GHWPARAMS3_HSPHY_IFC(dwc->hwparams.hwparams3)) {
   779		case DWC3_GHWPARAMS3_HSPHY_IFC_UTMI_ULPI:
   780			if (dwc->hsphy_interface &&
   781					!strncmp(dwc->hsphy_interface, "utmi", 4)) {
   782				reg &= ~DWC3_GUSB2PHYCFG_ULPI_UTMI;
   783				break;
   784			} else if (dwc->hsphy_interface &&
   785					!strncmp(dwc->hsphy_interface, "ulpi", 4)) {
   786				reg |= DWC3_GUSB2PHYCFG_ULPI_UTMI;
   787				dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(index), reg);
   788			} else {
   789				/* Relying on default value. */
   790				if (!(reg & DWC3_GUSB2PHYCFG_ULPI_UTMI))
   791					break;
   792			}
   793			fallthrough;
   794		case DWC3_GHWPARAMS3_HSPHY_IFC_ULPI:
   795		default:
   796			break;
   797		}
   798	
   799		switch (dwc->hsphy_mode) {
   800		case USBPHY_INTERFACE_MODE_UTMI:
   801			reg &= ~(DWC3_GUSB2PHYCFG_PHYIF_MASK |
   802			       DWC3_GUSB2PHYCFG_USBTRDTIM_MASK);
   803			reg |= DWC3_GUSB2PHYCFG_PHYIF(UTMI_PHYIF_8_BIT) |
   804			       DWC3_GUSB2PHYCFG_USBTRDTIM(USBTRDTIM_UTMI_8_BIT);
   805			break;
   806		case USBPHY_INTERFACE_MODE_UTMIW:
   807			reg &= ~(DWC3_GUSB2PHYCFG_PHYIF_MASK |
   808			       DWC3_GUSB2PHYCFG_USBTRDTIM_MASK);
   809			reg |= DWC3_GUSB2PHYCFG_PHYIF(UTMI_PHYIF_16_BIT) |
   810			       DWC3_GUSB2PHYCFG_USBTRDTIM(USBTRDTIM_UTMI_16_BIT);
   811			break;
   812		default:
   813			break;
   814		}
   815	
   816		/*
   817		 * Above DWC_usb3.0 1.94a, it is recommended to set
   818		 * DWC3_GUSB2PHYCFG_SUSPHY to '0' during coreConsultant configuration.
   819		 * So default value will be '0' when the core is reset. Application
   820		 * needs to set it to '1' after the core initialization is completed.
   821		 *
   822		 * Similarly for DRD controllers, GUSB2PHYCFG.SUSPHY must be cleared
   823		 * after power-on reset, and it can be set after core initialization.
   824		 */
   825		reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
   826	
   827		if (dwc->dis_enblslpm_quirk)
   828			reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM;
   829		else
   830			reg |= DWC3_GUSB2PHYCFG_ENBLSLPM;
   831	
   832		if (dwc->dis_u2_freeclk_exists_quirk || dwc->gfladj_refclk_lpm_sel)
   833			reg &= ~DWC3_GUSB2PHYCFG_U2_FREECLK_EXISTS;
   834	
   835		dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(index), reg);
   836	
   837		return 0;
   838	}
   839	

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