usb: host: xhci-rcar: Use xhci_plat_priv.quirks instead of code settings

This patch uses xhci_plat_priv.quirks to simplify. The previous
code had conditions to set some quirks in xhci_rcar_init_quirk().
But, the xhci_rcar_init_quirk() is called at the same conditions.
So, no behavior change.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/1567425698-27560-4-git-send-email-yoshihiro.shimoda.uh@renesas.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/xhci-rcar.c

@@ -107,15 +107,6 @@ static int xhci_rcar_is_gen2(struct device *dev)
 		of_device_is_compatible(node, "renesas,rcar-gen2-xhci");
 }
 
-static int xhci_rcar_is_gen3(struct device *dev)
-{
-	struct device_node *node = dev->of_node;
-
-	return of_device_is_compatible(node, "renesas,xhci-r8a7795") ||
-		of_device_is_compatible(node, "renesas,xhci-r8a7796") ||
-		of_device_is_compatible(node, "renesas,rcar-gen3-xhci");
-}
-
 void xhci_rcar_start(struct usb_hcd *hcd)
 {
 	u32 temp;
@@ -226,32 +217,13 @@ static bool xhci_rcar_wait_for_pll_active(struct usb_hcd *hcd)
 /* This function needs to initialize a "phy" of usb before */
 int xhci_rcar_init_quirk(struct usb_hcd *hcd)
 {
-	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
-
 	/* If hcd->regs is NULL, we don't just call the following function */
 	if (!hcd->regs)
 		return 0;
 
-	/*
-	 * On R-Car Gen2 and Gen3, the AC64 bit (bit 0) of HCCPARAMS1 is set
-	 * to 1. However, these SoCs don't support 64-bit address memory
-	 * pointers. So, this driver clears the AC64 bit of xhci->hcc_params
-	 * to call dma_set_coherent_mask(dev, DMA_BIT_MASK(32)) in
-	 * xhci_gen_setup().
-	 *
-	 * And, since the firmware/internal CPU control the USBSTS.STS_HALT
-	 * and the process speed is down when the roothub port enters U3,
-	 * long delay for the handshake of STS_HALT is neeed in xhci_suspend().
-	 */
-	if (xhci_rcar_is_gen2(hcd->self.controller) ||
-			xhci_rcar_is_gen3(hcd->self.controller)) {
-		xhci->quirks |= XHCI_NO_64BIT_SUPPORT | XHCI_SLOW_SUSPEND;
-	}
-
 	if (!xhci_rcar_wait_for_pll_active(hcd))
 		return -ETIMEDOUT;
 
-	xhci->quirks |= XHCI_TRUST_TX_LENGTH;
 	return xhci_rcar_download_firmware(hcd);
 }