Re: [PATCH net-next v1 3/4] net: phy: realtek: provide TimeSync data path delays for RTL8211E

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

Hi Oleksij,

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/Oleksij-Rempel/net-phy-Add-TimeSync-delay-query-support-to-PHYlib-API/20240418-004607
base:   net-next/main
patch link:    https://lore.kernel.org/r/20240417164316.1755299-4-o.rempel%40pengutronix.de
patch subject: [PATCH net-next v1 3/4] net: phy: realtek: provide TimeSync data path delays for RTL8211E
config: arm-defconfig (https://download.01.org/0day-ci/archive/20240418/202404181340.89g7TIG1-lkp@intel.com/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project.git f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240418/202404181340.89g7TIG1-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/202404181340.89g7TIG1-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/net/phy/realtek.c:278:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
           default:
           ^
   drivers/net/phy/realtek.c:278:2: note: insert 'break;' to avoid fall-through
           default:
           ^
           break; 
   1 warning generated.


vim +278 drivers/net/phy/realtek.c

   245	
   246	static int rtl8211e_get_timesync_data_path_delays(struct phy_device *phydev,
   247							  struct phy_timesync_delay *tsd)
   248	{
   249		phydev_warn(phydev, "Time stamping is not supported\n");
   250	
   251		switch (phydev->interface) {
   252		case PHY_INTERFACE_MODE_RGMII:
   253		case PHY_INTERFACE_MODE_RGMII_RXID:
   254		case PHY_INTERFACE_MODE_RGMII_TXID:
   255		case PHY_INTERFACE_MODE_RGMII_ID:
   256			/* The values are measured with RTL8211E and LAN8841 as link
   257			 * partners and confirmed with i211 to be in sane range.
   258			 */
   259			if (phydev->speed == SPEED_1000) {
   260				tsd->tx_min_delay_ns = 326;
   261				tsd->rx_min_delay_ns = 406;
   262				return 0;
   263			} else if (phydev->speed == SPEED_100) {
   264				tsd->tx_min_delay_ns = 703;
   265				tsd->rx_min_delay_ns = 621;
   266				return 0;
   267			} else if (phydev->speed == SPEED_10) {
   268				/* This value is suspiciously big, with atypical
   269				 * shift to Egress side. This value is confirmed
   270				 * by measuring RGMII-PHY-PHY-RGMII path delay.
   271				 * Similar results are confirmed with LAN8841 and i211
   272				 * as link partners.
   273				 */
   274				tsd->tx_min_delay_ns = 920231;
   275				tsd->rx_min_delay_ns = 1674;
   276				return 0;
   277			}
 > 278		default:
   279			break;
   280		}
   281	
   282		phydev_warn(phydev, "Not tested or not supported modes for path delay values\n");
   283	
   284		return -EOPNOTSUPP;
   285	}
   286	

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