Re: [PATCH v2 08/12] phy: tegra: xusb: t210: support wake and sleepwalk

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Hi JC,

I love your patch! Perhaps something to improve:

[auto build test WARNING on tegra/for-next]
[also build test WARNING on robh/for-next usb/usb-testing char-misc/char-misc-testing staging/staging-testing driver-core/driver-core-testing v5.9-rc3 next-20200828]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/JC-Kuo/Tegra-XHCI-controller-ELPG-support/20200831-124234
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux.git for-next
config: arm64-randconfig-r014-20200901 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c10e63677f5d20f18010f8f68c631ddc97546f7d)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> drivers/phy/tegra/xusb-tegra210.c:1368:5: warning: no previous prototype for function 'tegra_pmc_utmi_enable_phy_sleepwalk' [-Wmissing-prototypes]
   int tegra_pmc_utmi_enable_phy_sleepwalk(struct phy *phy,
       ^
   drivers/phy/tegra/xusb-tegra210.c:1368:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int tegra_pmc_utmi_enable_phy_sleepwalk(struct phy *phy,
   ^
   static 
>> drivers/phy/tegra/xusb-tegra210.c:1527:5: warning: no previous prototype for function 'tegra_pmc_utmi_disable_phy_sleepwalk' [-Wmissing-prototypes]
   int tegra_pmc_utmi_disable_phy_sleepwalk(struct phy *phy)
       ^
   drivers/phy/tegra/xusb-tegra210.c:1527:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int tegra_pmc_utmi_disable_phy_sleepwalk(struct phy *phy)
   ^
   static 
>> drivers/phy/tegra/xusb-tegra210.c:1577:5: warning: no previous prototype for function 'tegra_pmc_hsic_enable_phy_sleepwalk' [-Wmissing-prototypes]
   int tegra_pmc_hsic_enable_phy_sleepwalk(struct phy *phy)
       ^
   drivers/phy/tegra/xusb-tegra210.c:1577:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int tegra_pmc_hsic_enable_phy_sleepwalk(struct phy *phy)
   ^
   static 
>> drivers/phy/tegra/xusb-tegra210.c:1680:5: warning: no previous prototype for function 'tegra_pmc_hsic_disable_phy_sleepwalk' [-Wmissing-prototypes]
   int tegra_pmc_hsic_disable_phy_sleepwalk(struct phy *phy)
       ^
   drivers/phy/tegra/xusb-tegra210.c:1680:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int tegra_pmc_hsic_disable_phy_sleepwalk(struct phy *phy)
   ^
   static 
>> drivers/phy/tegra/xusb-tegra210.c:3036:5: warning: no previous prototype for function 'tegra210_xusb_padctl_remote_wake_detected' [-Wmissing-prototypes]
   int tegra210_xusb_padctl_remote_wake_detected(struct phy *phy)
       ^
   drivers/phy/tegra/xusb-tegra210.c:3036:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int tegra210_xusb_padctl_remote_wake_detected(struct phy *phy)
   ^
   static 
   5 warnings generated.

# https://github.com/0day-ci/linux/commit/85501cb657fc0bbb792dc08358e31fad69c8b13c
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review JC-Kuo/Tegra-XHCI-controller-ELPG-support/20200831-124234
git checkout 85501cb657fc0bbb792dc08358e31fad69c8b13c
vim +/tegra_pmc_utmi_enable_phy_sleepwalk +1368 drivers/phy/tegra/xusb-tegra210.c

  1366	
  1367	/* T210 USB2 SLEEPWALK APIs */
> 1368	int tegra_pmc_utmi_enable_phy_sleepwalk(struct phy *phy,
  1369						enum usb_device_speed speed)
  1370	{
  1371		struct tegra_xusb_lane *lane = phy_get_drvdata(phy);
  1372		struct tegra_xusb_padctl *padctl = lane->pad->padctl;
  1373		struct tegra210_xusb_padctl *priv = to_tegra210_xusb_padctl(padctl);
  1374		struct device *dev = padctl->dev;
  1375		unsigned int port = lane->index;
  1376		u32 val, tctrl, pctrl, rpd_ctrl;
  1377	
  1378		if (speed > USB_SPEED_HIGH)
  1379			return -EINVAL;
  1380	
  1381		dev_dbg(dev, "phy enable sleepwalk usb2 %d speed %d\n", port, speed);
  1382	
  1383		val = padctl_readl(padctl, XUSB_PADCTL_USB2_BIAS_PAD_CTL1);
  1384		tctrl = TCTRL_VALUE(val);
  1385		pctrl = PCTRL_VALUE(val);
  1386	
  1387		val = padctl_readl(padctl, XUSB_PADCTL_USB2_OTG_PADX_CTL1(port));
  1388		rpd_ctrl = RPD_CTRL_VALUE(val);
  1389	
  1390		/* ensure sleepwalk logic is disabled */
  1391		val = padctl_pmc_readl(priv, PMC_UTMIP_UHSIC_SLEEP_CFG(port));
  1392		val &= ~UTMIP_MASTER_ENABLE(port);
  1393		padctl_pmc_writel(priv, val, PMC_UTMIP_UHSIC_SLEEP_CFG(port));
  1394	
  1395		/* ensure sleepwalk logics are in low power mode */
  1396		val = padctl_pmc_readl(priv, PMC_UTMIP_MASTER_CONFIG);
  1397		val |= UTMIP_PWR(port);
  1398		padctl_pmc_writel(priv, val, PMC_UTMIP_MASTER_CONFIG);
  1399	
  1400		/* set debounce time */
  1401		val = padctl_pmc_readl(priv, PMC_USB_DEBOUNCE_DEL);
  1402		val &= ~UTMIP_LINE_DEB_CNT(~0);
  1403		val |= UTMIP_LINE_DEB_CNT(0x1);
  1404		padctl_pmc_writel(priv, val, PMC_USB_DEBOUNCE_DEL);
  1405	
  1406		/* ensure fake events of sleepwalk logic are desiabled */
  1407		val = padctl_pmc_readl(priv, PMC_UTMIP_UHSIC_FAKE(port));
  1408		val &= ~(UTMIP_FAKE_USBOP_VAL(port) | UTMIP_FAKE_USBON_VAL(port) |
  1409				UTMIP_FAKE_USBOP_EN(port) | UTMIP_FAKE_USBON_EN(port));
  1410		padctl_pmc_writel(priv, val, PMC_UTMIP_UHSIC_FAKE(port));
  1411	
  1412		/* ensure wake events of sleepwalk logic are not latched */
  1413		val = padctl_pmc_readl(priv, PMC_UTMIP_UHSIC_LINE_WAKEUP);
  1414		val &= ~UTMIP_LINE_WAKEUP_EN(port);
  1415		padctl_pmc_writel(priv, val, PMC_UTMIP_UHSIC_LINE_WAKEUP);
  1416	
  1417		/* disable wake event triggers of sleepwalk logic */
  1418		val = padctl_pmc_readl(priv, PMC_UTMIP_UHSIC_SLEEP_CFG(port));
  1419		val &= ~UTMIP_WAKE_VAL(port, ~0);
  1420		val |= UTMIP_WAKE_VAL_NONE(port);
  1421		padctl_pmc_writel(priv, val, PMC_UTMIP_UHSIC_SLEEP_CFG(port));
  1422	
  1423		/* power down the line state detectors of the pad */
  1424		val = padctl_pmc_readl(priv, PMC_USB_AO);
  1425		val |= (USBOP_VAL_PD(port) | USBON_VAL_PD(port));
  1426		padctl_pmc_writel(priv, val, PMC_USB_AO);
  1427	
  1428		/* save state per speed */
  1429		val = padctl_pmc_readl(priv, PMC_UTMIP_UHSIC_SAVED_STATE(port));
  1430		val &= ~SPEED(port, ~0);
  1431		if (speed == USB_SPEED_HIGH)
  1432			val |= UTMI_HS(port);
  1433		else if (speed == USB_SPEED_FULL)
  1434			val |= UTMI_FS(port);
  1435		else if (speed == USB_SPEED_LOW)
  1436			val |= UTMI_LS(port);
  1437		else
  1438			val |= UTMI_RST(port);
  1439		padctl_pmc_writel(priv, val, PMC_UTMIP_UHSIC_SAVED_STATE(port));
  1440	
  1441		/* enable the trigger of the sleepwalk logic */
  1442		val = padctl_pmc_readl(priv, PMC_UTMIP_UHSIC_SLEEPWALK_CFG(port));
  1443		val |= UTMIP_LINEVAL_WALK_EN(port);
  1444		padctl_pmc_writel(priv, val, PMC_UTMIP_UHSIC_SLEEPWALK_CFG(port));
  1445	
  1446		/* reset the walk pointer and clear the alarm of the sleepwalk logic,
  1447		 * as well as capture the configuration of the USB2.0 pad
  1448		 */
  1449		val = padctl_pmc_readl(priv, PMC_UTMIP_UHSIC_TRIGGERS);
  1450		val |= (UTMIP_CLR_WALK_PTR(port) | UTMIP_CLR_WAKE_ALARM(port) |
  1451			UTMIP_CAP_CFG(port));
  1452		padctl_pmc_writel(priv, val, PMC_UTMIP_UHSIC_TRIGGERS);
  1453	
  1454		/* program electrical parameters read from XUSB PADCTL */
  1455		val = padctl_pmc_readl(priv, PMC_UTMIP_TERM_PAD_CFG);
  1456		val &= ~(TCTRL_VAL(~0) | PCTRL_VAL(~0));
  1457		val |= (TCTRL_VAL(tctrl) | PCTRL_VAL(pctrl));
  1458		padctl_pmc_writel(priv, val, PMC_UTMIP_TERM_PAD_CFG);
  1459	
  1460		val = padctl_pmc_readl(priv, PMC_UTMIP_PAD_CFGX(port));
  1461		val &= ~RPD_CTRL_PX(~0);
  1462		val |= RPD_CTRL_PX(rpd_ctrl);
  1463		padctl_pmc_writel(priv, val, PMC_UTMIP_PAD_CFGX(port));
  1464	
  1465		/* setup the pull-ups and pull-downs of the signals during the four
  1466		 * stages of sleepwalk.
  1467		 * if device is connected, program sleepwalk logic to maintain a J and
  1468		 * keep driving K upon seeing remote wake.
  1469		 */
  1470		val = padctl_pmc_readl(priv, PMC_UTMIP_SLEEPWALK_PX(port));
  1471		val = (UTMIP_USBOP_RPD_A | UTMIP_USBOP_RPD_B | UTMIP_USBOP_RPD_C |
  1472			UTMIP_USBOP_RPD_D);
  1473		val |= (UTMIP_USBON_RPD_A | UTMIP_USBON_RPD_B | UTMIP_USBON_RPD_C |
  1474			UTMIP_USBON_RPD_D);
  1475		if (speed == USB_SPEED_UNKNOWN) {
  1476			val |= (UTMIP_HIGHZ_A | UTMIP_HIGHZ_B | UTMIP_HIGHZ_C |
  1477				UTMIP_HIGHZ_D);
  1478		} else if ((speed == USB_SPEED_HIGH) || (speed == USB_SPEED_FULL)) {
  1479			/* J state: D+/D- = high/low, K state: D+/D- = low/high */
  1480			val |= UTMIP_HIGHZ_A;
  1481			val |= UTMIP_AP_A;
  1482			val |= (UTMIP_AN_B | UTMIP_AN_C | UTMIP_AN_D);
  1483		} else if (speed == USB_SPEED_LOW) {
  1484			/* J state: D+/D- = low/high, K state: D+/D- = high/low */
  1485			val |= UTMIP_HIGHZ_A;
  1486			val |= UTMIP_AN_A;
  1487			val |= (UTMIP_AP_B | UTMIP_AP_C | UTMIP_AP_D);
  1488		}
  1489		padctl_pmc_writel(priv, val, PMC_UTMIP_SLEEPWALK_PX(port));
  1490	
  1491		/* power up the line state detectors of the pad */
  1492		val = padctl_pmc_readl(priv, PMC_USB_AO);
  1493		val &= ~(USBOP_VAL_PD(port) | USBON_VAL_PD(port));
  1494		padctl_pmc_writel(priv, val, PMC_USB_AO);
  1495	
  1496		usleep_range(50, 100);
  1497	
  1498		/* switch the electric control of the USB2.0 pad to PMC */
  1499		val = padctl_pmc_readl(priv, PMC_UTMIP_UHSIC_SLEEP_CFG(port));
  1500		val |= (UTMIP_FSLS_USE_PMC(port) | UTMIP_PCTRL_USE_PMC(port) |
  1501				UTMIP_TCTRL_USE_PMC(port));
  1502		padctl_pmc_writel(priv, val, PMC_UTMIP_UHSIC_SLEEP_CFG(port));
  1503	
  1504		val = padctl_pmc_readl(priv, PMC_UTMIP_UHSIC_SLEEP_CFG1);
  1505		val |= (UTMIP_RPD_CTRL_USE_PMC_PX(port) |
  1506				UTMIP_RPU_SWITC_LOW_USE_PMC_PX(port));
  1507		padctl_pmc_writel(priv, val, PMC_UTMIP_UHSIC_SLEEP_CFG1);
  1508	
  1509		/* set the wake signaling trigger events */
  1510		val = padctl_pmc_readl(priv, PMC_UTMIP_UHSIC_SLEEP_CFG(port));
  1511		val &= ~UTMIP_WAKE_VAL(port, ~0);
  1512		val |= UTMIP_WAKE_VAL_ANY(port);
  1513		padctl_pmc_writel(priv, val, PMC_UTMIP_UHSIC_SLEEP_CFG(port));
  1514	
  1515		/* enable the wake detection */
  1516		val = padctl_pmc_readl(priv, PMC_UTMIP_UHSIC_SLEEP_CFG(port));
  1517		val |= UTMIP_MASTER_ENABLE(port);
  1518		padctl_pmc_writel(priv, val, PMC_UTMIP_UHSIC_SLEEP_CFG(port));
  1519	
  1520		val = padctl_pmc_readl(priv, PMC_UTMIP_UHSIC_LINE_WAKEUP);
  1521		val |= UTMIP_LINE_WAKEUP_EN(port);
  1522		padctl_pmc_writel(priv, val, PMC_UTMIP_UHSIC_LINE_WAKEUP);
  1523	
  1524		return 0;
  1525	}
  1526	
> 1527	int tegra_pmc_utmi_disable_phy_sleepwalk(struct phy *phy)
  1528	{
  1529		struct tegra_xusb_lane *lane = phy_get_drvdata(phy);
  1530		struct tegra_xusb_padctl *padctl = lane->pad->padctl;
  1531		struct tegra210_xusb_padctl *priv = to_tegra210_xusb_padctl(padctl);
  1532		struct device *dev = padctl->dev;
  1533		unsigned int port = lane->index;
  1534		u32 value;
  1535	
  1536		dev_dbg(dev, "phy disable sleepwalk usb2 %d\n", port);
  1537	
  1538		/* disable the wake detection */
  1539		value = padctl_pmc_readl(priv, PMC_UTMIP_UHSIC_SLEEP_CFG(port));
  1540		value &= ~UTMIP_MASTER_ENABLE(port);
  1541		padctl_pmc_writel(priv, value, PMC_UTMIP_UHSIC_SLEEP_CFG(port));
  1542	
  1543		value = padctl_pmc_readl(priv, PMC_UTMIP_UHSIC_LINE_WAKEUP);
  1544		value &= ~UTMIP_LINE_WAKEUP_EN(port);
  1545		padctl_pmc_writel(priv, value, PMC_UTMIP_UHSIC_LINE_WAKEUP);
  1546	
  1547		/* switch the electric control of the USB2.0 pad to XUSB or USB2 */
  1548		value = padctl_pmc_readl(priv, PMC_UTMIP_UHSIC_SLEEP_CFG(port));
  1549		value &= ~(UTMIP_FSLS_USE_PMC(port) | UTMIP_PCTRL_USE_PMC(port) |
  1550				UTMIP_TCTRL_USE_PMC(port));
  1551		padctl_pmc_writel(priv, value, PMC_UTMIP_UHSIC_SLEEP_CFG(port));
  1552	
  1553		value = padctl_pmc_readl(priv, PMC_UTMIP_UHSIC_SLEEP_CFG1);
  1554		value &= ~(UTMIP_RPD_CTRL_USE_PMC_PX(port) |
  1555				UTMIP_RPU_SWITC_LOW_USE_PMC_PX(port));
  1556		padctl_pmc_writel(priv, value, PMC_UTMIP_UHSIC_SLEEP_CFG1);
  1557	
  1558		/* disable wake event triggers of sleepwalk logic */
  1559		value = padctl_pmc_readl(priv, PMC_UTMIP_UHSIC_SLEEP_CFG(port));
  1560		value &= ~UTMIP_WAKE_VAL(port, ~0);
  1561		value |= UTMIP_WAKE_VAL_NONE(port);
  1562		padctl_pmc_writel(priv, value, PMC_UTMIP_UHSIC_SLEEP_CFG(port));
  1563	
  1564		/* power down the line state detectors of the port */
  1565		value = padctl_pmc_readl(priv, PMC_USB_AO);
  1566		value |= (USBOP_VAL_PD(port) | USBON_VAL_PD(port));
  1567		padctl_pmc_writel(priv, value, PMC_USB_AO);
  1568	
  1569		/* clear alarm of the sleepwalk logic */
  1570		value = padctl_pmc_readl(priv, PMC_UTMIP_UHSIC_TRIGGERS);
  1571		value |= UTMIP_CLR_WAKE_ALARM(port);
  1572		padctl_pmc_writel(priv, value, PMC_UTMIP_UHSIC_TRIGGERS);
  1573	
  1574		return 0;
  1575	}
  1576	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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