usb: xhci-rcar: convert to readl_poll_timeout_atomic()

Use readl_poll_timeout_atomic() to simplify code

Cc: Mathias Nyman <mathias.nyman@linux.intel.com>
Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/1600668815-12135-4-git-send-email-chunfeng.yun@mediatek.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/xhci-rcar.c

@@ -6,6 +6,7 @@
  */
 
 #include <linux/firmware.h>
+#include <linux/iopoll.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/of.h>
@@ -127,8 +128,7 @@ static int xhci_rcar_download_firmware(struct usb_hcd *hcd)
 	void __iomem *regs = hcd->regs;
 	struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
 	const struct firmware *fw;
-	int retval, index, j, time;
-	int timeout = 10000;
+	int retval, index, j;
 	u32 data, val, temp;
 	u32 quirks = 0;
 	const struct soc_device_attribute *attr;
@@ -166,32 +166,19 @@ static int xhci_rcar_download_firmware(struct usb_hcd *hcd)
 		temp |= RCAR_USB3_DL_CTRL_FW_SET_DATA0;
 		writel(temp, regs + RCAR_USB3_DL_CTRL);
 
-		for (time = 0; time < timeout; time++) {
-			val = readl(regs + RCAR_USB3_DL_CTRL);
-			if ((val & RCAR_USB3_DL_CTRL_FW_SET_DATA0) == 0)
-				break;
-			udelay(1);
-		}
-		if (time == timeout) {
-			retval = -ETIMEDOUT;
+		retval = readl_poll_timeout_atomic(regs + RCAR_USB3_DL_CTRL,
+				val, !(val & RCAR_USB3_DL_CTRL_FW_SET_DATA0),
+				1, 10000);
+		if (retval < 0)
 			break;
-		}
 	}
 
 	temp = readl(regs + RCAR_USB3_DL_CTRL);
 	temp &= ~RCAR_USB3_DL_CTRL_ENABLE;
 	writel(temp, regs + RCAR_USB3_DL_CTRL);
 
-	for (time = 0; time < timeout; time++) {
-		val = readl(regs + RCAR_USB3_DL_CTRL);
-		if (val & RCAR_USB3_DL_CTRL_FW_SUCCESS) {
-			retval = 0;
-			break;
-		}
-		udelay(1);
-	}
-	if (time == timeout)
-		retval = -ETIMEDOUT;
+	retval = readl_poll_timeout_atomic((regs + RCAR_USB3_DL_CTRL),
+			val, val & RCAR_USB3_DL_CTRL_FW_SUCCESS, 1, 10000);
 
 	release_firmware(fw);
 
@@ -200,18 +187,12 @@ static int xhci_rcar_download_firmware(struct usb_hcd *hcd)
 
 static bool xhci_rcar_wait_for_pll_active(struct usb_hcd *hcd)
 {
-	int timeout = 1000;
+	int retval;
 	u32 val, mask = RCAR_USB3_AXH_STA_PLL_ACTIVE_MASK;
 
-	while (timeout > 0) {
-		val = readl(hcd->regs + RCAR_USB3_AXH_STA);
-		if ((val & mask) == mask)
-			return true;
-		udelay(1);
-		timeout--;
-	}
-
-	return false;
+	retval = readl_poll_timeout_atomic(hcd->regs + RCAR_USB3_AXH_STA,
+			val, (val & mask) == mask, 1, 1000);
+	return !retval;
 }
 
 /* This function needs to initialize a "phy" of usb before */