phy: renesas: rcar-gen3-usb2: Set timing registers only once

commit 86e7084 upstream.

phy-rcar-gen3-usb2 driver exports 4 PHYs. The timing registers are common
to all PHYs. There is no need to set them every time a PHY is initialized.
Set timing register only when the 1st PHY is initialized.

Fixes: f3b5a8d ("phy: rcar-gen3-usb2: Add R-Car Gen3 USB2 PHY driver")
Cc: [email protected]
Reviewed-by: Yoshihiro Shimoda <[email protected]>
Tested-by: Yoshihiro Shimoda <[email protected]>
Reviewed-by: Lad Prabhakar <[email protected]>
Signed-off-by: Claudiu Beznea <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: claudiubeznea

drivers/phy/renesas/phy-rcar-gen3-usb2.c

@@ -453,8 +453,11 @@ static int rcar_gen3_phy_usb2_init(struct phy *p)
 	val = readl(usb2_base + USB2_INT_ENABLE);
 	val |= USB2_INT_ENABLE_UCOM_INTEN | rphy->int_enable_bits;
 	writel(val, usb2_base + USB2_INT_ENABLE);
-	writel(USB2_SPD_RSM_TIMSET_INIT, usb2_base + USB2_SPD_RSM_TIMSET);
-	writel(USB2_OC_TIMSET_INIT, usb2_base + USB2_OC_TIMSET);
+
+	if (!rcar_gen3_is_any_rphy_initialized(channel)) {
+		writel(USB2_SPD_RSM_TIMSET_INIT, usb2_base + USB2_SPD_RSM_TIMSET);
+		writel(USB2_OC_TIMSET_INIT, usb2_base + USB2_OC_TIMSET);
+	}
 
 	/* Initialize otg part */
 	if (channel->is_otg_channel) {