Re: [PATCH net-next v3] net: ethernet: mediatek: add EEE support

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

Hi Qingfang,

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/Qingfang-Deng/net-ethernet-mediatek-add-EEE-support/20250217-114148
base:   net-next/main
patch link:    https://lore.kernel.org/r/20250217033954.3698772-1-dqfext%40gmail.com
patch subject: [PATCH net-next v3] net: ethernet: mediatek: add EEE support
config: arm64-randconfig-001-20250217 (https://download.01.org/0day-ci/archive/20250217/202502171610.TU1Cuzq5-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250217/202502171610.TU1Cuzq5-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/202502171610.TU1Cuzq5-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/net/ethernet/mediatek/mtk_eth_soc.c: In function 'mtk_mac_enable_tx_lpi':
>> drivers/net/ethernet/mediatek/mtk_eth_soc.c:860:1: warning: control reaches end of non-void function [-Wreturn-type]
     860 | }
         | ^


vim +860 drivers/net/ethernet/mediatek/mtk_eth_soc.c

   826	
   827	static int mtk_mac_enable_tx_lpi(struct phylink_config *config, u32 timer,
   828					 bool tx_clk_stop)
   829	{
   830		struct mtk_mac *mac = container_of(config, struct mtk_mac,
   831						   phylink_config);
   832		struct mtk_eth *eth = mac->hw;
   833		u32 val;
   834	
   835		/* Tx idle timer in ms */
   836		timer = DIV_ROUND_UP(timer, 1000);
   837	
   838		/* If the timer is zero, then set LPI_MODE, which allows the
   839		 * system to enter LPI mode immediately rather than waiting for
   840		 * the LPI threshold.
   841		 */
   842		if (!timer)
   843			val = MAC_EEE_LPI_MODE;
   844		else if (FIELD_FIT(MAC_EEE_LPI_TXIDLE_THD, timer))
   845			val = FIELD_PREP(MAC_EEE_LPI_TXIDLE_THD, timer);
   846		else
   847			val = MAC_EEE_LPI_TXIDLE_THD;
   848	
   849		if (tx_clk_stop)
   850			val |= MAC_EEE_CKG_TXIDLE;
   851	
   852		/* PHY Wake-up time, this field does not have a reset value, so use the
   853		 * reset value from MT7531 (36us for 100M and 17us for 1000M).
   854		 */
   855		val |= FIELD_PREP(MAC_EEE_WAKEUP_TIME_1000, 17) |
   856		       FIELD_PREP(MAC_EEE_WAKEUP_TIME_100, 36);
   857	
   858		mtk_w32(eth, val, MTK_MAC_EEECR(mac->id));
   859		mtk_m32(eth, 0, MAC_MCR_EEE100M | MAC_MCR_EEE1G, MTK_MAC_MCR(mac->id));
 > 860	}
   861	

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