Re: [PATCH v4 07/11] net: ethernet: stmmac: add management of stm32mp13 for stm32

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

Hi Christophe,

kernel test robot noticed the following build warnings:

[auto build test WARNING on cd0057ad75116bacf16fea82e48c1db642971136]

url:    https://github.com/intel-lab-lkp/linux/commits/Christophe-Roullier/dt-bindings-net-add-STM32MP13-compatible-in-documentation-for-stm32/20240604-224324
base:   cd0057ad75116bacf16fea82e48c1db642971136
patch link:    https://lore.kernel.org/r/20240604143502.154463-8-christophe.roullier%40foss.st.com
patch subject: [PATCH v4 07/11] net: ethernet: stmmac: add management of stm32mp13 for stm32
config: arm-defconfig (https://download.01.org/0day-ci/archive/20240605/202406050248.rGgTkevY-lkp@intel.com/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240605/202406050248.rGgTkevY-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/202406050248.rGgTkevY-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c:239:4: warning: variable 'val' is uninitialized when used here [-Wuninitialized]
                           val |= SYSCFG_PMCR_ETH_SEL_MII;
                           ^~~
   drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c:228:9: note: initialize the variable 'val' to silence this warning
           int val;
                  ^
                   = 0
   1 warning generated.


vim +/val +239 drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c

   223	
   224	static int stm32mp1_configure_pmcr(struct plat_stmmacenet_data *plat_dat)
   225	{
   226		struct stm32_dwmac *dwmac = plat_dat->bsp_priv;
   227		u32 reg = dwmac->mode_reg;
   228		int val;
   229	
   230		switch (plat_dat->mac_interface) {
   231		case PHY_INTERFACE_MODE_MII:
   232			/*
   233			 * STM32MP15xx supports both MII and GMII, STM32MP13xx MII only.
   234			 * SYSCFG_PMCSETR ETH_SELMII is present only on STM32MP15xx and
   235			 * acts as a selector between 0:GMII and 1:MII. As STM32MP13xx
   236			 * supports only MII, ETH_SELMII is not present.
   237			 */
   238			if (!dwmac->is_mp13)	/* Select MII mode on STM32MP15xx */
 > 239				val |= SYSCFG_PMCR_ETH_SEL_MII;
   240			break;
   241		case PHY_INTERFACE_MODE_GMII:
   242			val = SYSCFG_PMCR_ETH_SEL_GMII;
   243			if (dwmac->enable_eth_ck)
   244				val |= SYSCFG_PMCR_ETH_CLK_SEL;
   245			break;
   246		case PHY_INTERFACE_MODE_RMII:
   247			val = SYSCFG_PMCR_ETH_SEL_RMII;
   248			if (dwmac->enable_eth_ck)
   249				val |= SYSCFG_PMCR_ETH_REF_CLK_SEL;
   250			break;
   251		case PHY_INTERFACE_MODE_RGMII:
   252		case PHY_INTERFACE_MODE_RGMII_ID:
   253		case PHY_INTERFACE_MODE_RGMII_RXID:
   254		case PHY_INTERFACE_MODE_RGMII_TXID:
   255			val = SYSCFG_PMCR_ETH_SEL_RGMII;
   256			if (dwmac->enable_eth_ck)
   257				val |= SYSCFG_PMCR_ETH_CLK_SEL;
   258			break;
   259		default:
   260			dev_err(dwmac->dev, "Mode %s not supported",
   261				phy_modes(plat_dat->mac_interface));
   262			/* Do not manage others interfaces */
   263			return -EINVAL;
   264		}
   265	
   266		dev_dbg(dwmac->dev, "Mode %s", phy_modes(plat_dat->mac_interface));
   267	
   268		/* Shift value at correct ethernet MAC offset in SYSCFG_PMCSETR */
   269		val <<= ffs(dwmac->mode_mask) - ffs(SYSCFG_MP1_ETH_MASK);
   270	
   271		/* Need to update PMCCLRR (clear register) */
   272		regmap_write(dwmac->regmap, dwmac->ops->syscfg_clr_off,
   273			     dwmac->mode_mask);
   274	
   275		/* Update PMCSETR (set register) */
   276		return regmap_update_bits(dwmac->regmap, reg,
   277					 dwmac->mode_mask, val);
   278	}
   279	

-- 
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https://github.com/intel/lkp-tests/wiki