Re: [PATCH net-next 4/6] dpll: zl3073x: Cache all reference properties in zl3073x_ref

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

Hi Ivan,

kernel test robot noticed the following build warnings:

[auto build test WARNING on net-next/main]

url:    https://github.com/intel-lab-lkp/linux/commits/Ivan-Vecera/dpll-zl3073x-Store-raw-register-values-instead-of-parsed-state/20251111-020236
base:   net-next/main
patch link:    https://lore.kernel.org/r/20251110175818.1571610-5-ivecera%40redhat.com
patch subject: [PATCH net-next 4/6] dpll: zl3073x: Cache all reference properties in zl3073x_ref
config: x86_64-randconfig-161-20251111 (https://download.01.org/0day-ci/archive/20251111/202511111402.yEyMEeLb-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251111/202511111402.yEyMEeLb-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/202511111402.yEyMEeLb-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/dpll/zl3073x/dpll.c: In function 'zl3073x_dpll_pin_phase_offset_check':
>> drivers/dpll/zl3073x/dpll.c:1850:35: warning: variable 'ref' set but not used [-Wunused-but-set-variable]
    1850 |         const struct zl3073x_ref *ref;
         |                                   ^~~


vim +/ref +1850 drivers/dpll/zl3073x/dpll.c

  1836	
  1837	/**
  1838	 * zl3073x_dpll_pin_phase_offset_check - check for pin phase offset change
  1839	 * @pin: pin to check
  1840	 *
  1841	 * Check for the change of DPLL to connected pin phase offset change.
  1842	 *
  1843	 * Return: true on phase offset change, false otherwise
  1844	 */
  1845	static bool
  1846	zl3073x_dpll_pin_phase_offset_check(struct zl3073x_dpll_pin *pin)
  1847	{
  1848		struct zl3073x_dpll *zldpll = pin->dpll;
  1849		struct zl3073x_dev *zldev = zldpll->dev;
> 1850		const struct zl3073x_ref *ref;
  1851		unsigned int reg;
  1852		s64 phase_offset;
  1853		u8 ref_id;
  1854		int rc;
  1855	
  1856		ref_id = zl3073x_input_pin_ref_get(pin->id);
  1857		ref = zl3073x_ref_state_get(zldev, ref_id);
  1858	
  1859		/* No phase offset if the ref monitor reports signal errors */
  1860		if (!zl3073x_dev_ref_is_status_ok(zldev, ref_id))
  1861			return false;
  1862	
  1863		/* Select register to read phase offset value depending on pin and
  1864		 * phase monitor state:
  1865		 * 1) For connected pin use dpll_phase_err_data register
  1866		 * 2) For other pins use appropriate ref_phase register if the phase
  1867		 *    monitor feature is enabled.
  1868		 */
  1869		if (pin->pin_state == DPLL_PIN_STATE_CONNECTED)
  1870			reg = ZL_REG_DPLL_PHASE_ERR_DATA(zldpll->id);
  1871		else if (zldpll->phase_monitor)
  1872			reg = ZL_REG_REF_PHASE(ref_id);
  1873		else
  1874			return false;
  1875	
  1876		/* Read measured phase offset value */
  1877		rc = zl3073x_read_u48(zldev, reg, &phase_offset);
  1878		if (rc) {
  1879			dev_err(zldev->dev, "Failed to read ref phase offset: %pe\n",
  1880				ERR_PTR(rc));
  1881	
  1882			return false;
  1883		}
  1884	
  1885		/* Convert to ps */
  1886		phase_offset = div_s64(sign_extend64(phase_offset, 47), 100);
  1887	
  1888		/* Compare with previous value */
  1889		if (phase_offset != pin->phase_offset) {
  1890			dev_dbg(zldev->dev, "%s phase offset changed: %lld -> %lld\n",
  1891				pin->label, pin->phase_offset, phase_offset);
  1892			pin->phase_offset = phase_offset;
  1893	
  1894			return true;
  1895		}
  1896	
  1897		return false;
  1898	}
  1899	

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