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-002-20250217 (https://download.01.org/0day-ci/archive/20250217/202502171639.wrPFfdvn-lkp@intel.com/config)
compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project 910be4ff90d7d07bd4518ea03b85c0974672bf9c)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250217/202502171639.wrPFfdvn-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/202502171639.wrPFfdvn-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from drivers/net/ethernet/mediatek/mtk_eth_soc.c:10:
   In file included from include/linux/of_mdio.h:12:
   In file included from include/linux/phy.h:16:
   In file included from include/linux/ethtool.h:18:
   In file included from include/linux/if_ether.h:19:
   In file included from include/linux/skbuff.h:17:
   In file included from include/linux/bvec.h:10:
   In file included from include/linux/highmem.h:8:
   In file included from include/linux/cacheflush.h:5:
   In file included from arch/arm64/include/asm/cacheflush.h:11:
   In file included from include/linux/kgdb.h:19:
   In file included from include/linux/kprobes.h:28:
   In file included from include/linux/ftrace.h:13:
   In file included from include/linux/kallsyms.h:13:
   In file included from include/linux/mm.h:2224:
   include/linux/vmstat.h:504:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     504 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     505 |                            item];
         |                            ~~~~
   include/linux/vmstat.h:511:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     511 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     512 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
   include/linux/vmstat.h:524:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion]
     524 |         return vmstat_text[NR_VM_ZONE_STAT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~ ^
     525 |                            NR_VM_NUMA_EVENT_ITEMS +
         |                            ~~~~~~~~~~~~~~~~~~~~~~
>> drivers/net/ethernet/mediatek/mtk_eth_soc.c:860:1: warning: non-void function does not return a value in all control paths [-Wreturn-type]
     860 | }
         | ^
   4 warnings generated.


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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