Patch "usb: host: xhci-plat: fix cannot work if R-Car Gen2/3 run on above 4GB phys" has been added to the 4.5-stable tree

This is a note to let you know that I've just added the patch titled

usb: host: xhci-plat: fix cannot work if R-Car Gen2/3 run on above 4GB phys

to the 4.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:

     usb-host-xhci-plat-fix-cannot-work-if-r-car-gen2-3-run-on-above-4gb-phys.patch

and it can be found in the queue-4.5 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Yoshihiro Shimoda <[email protected]>
Date: Fri, 8 Apr 2016 16:25:08 +0300
Subject: usb: host: xhci-plat: fix cannot work if R-Car Gen2/3 run on above 4GB phys

From: Yoshihiro Shimoda <[email protected]>

commit 5ad3b03e4910f9f62342956ecdc758c7af6b8699 upstream.

This patch fixes an issue that cannot work if R-Car Gen2/3 run on above 4GB physical memory environment to use a quirk XHCI_NO_64BIT_SUPPORT.

---
 drivers/usb/host/xhci-plat.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)

@@ -39,12 +39,25 @@ static const struct xhci_driver_override
 
 static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
 {
+	struct usb_hcd *hcd = xhci_to_hcd(xhci);
+
 	/*
 	 * As of now platform drivers don't provide MSI support so we ensure
 	 * here that the generic code does not try to make a pci_dev from our
 	 * dev struct in order to setup MSI
 	 */
 	xhci->quirks |= XHCI_PLAT;
+
+	/*
+	 * 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().
+	 */
+	if (xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2) ||
+	    xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN3))
+		xhci->quirks |= XHCI_NO_64BIT_SUPPORT;
 }
 
 /* called during probe() after chip reset completes */

Patches currently in stable-queue which might be from [email protected] are

queue-4.5/usb-host-xhci-plat-make-enum-xhci_plat_type-start-at-a-non-zero-value.patch queue-4.5/usb-host-xhci-plat-fix-cannot-work-if-r-car-gen2-3-run-on-above-4gb-phys.patch queue-4.5/usb-host-xhci-add-a-new-quirk-xhci_no_64bit_support.patch