This is a note to let you know that I've just added the patch titled
usb: host: xhci: add a new quirk XHCI_NO_64BIT_SUPPORT
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-add-a-new-quirk-xhci_no_64bit_support.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 <stable@xxxxxxxxxxxxxxx> know about it.
>From 0a380be8233dbf8dd20795b801c5d5d5ef3992f7 Mon Sep 17 00:00:00 2001
From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Date: Fri, 8 Apr 2016 16:25:07 +0300
Subject: usb: host: xhci: add a new quirk XHCI_NO_64BIT_SUPPORT
From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
commit 0a380be8233dbf8dd20795b801c5d5d5ef3992f7 upstream.
On some xHCI controllers (e.g. R-Car SoCs), the AC64 bit (bit 0) of
HCCPARAMS1 is set to 1. However, the xHCs don't support 64-bit
address memory pointers actually. So, in this case, this driver should
call dma_set_coherent_mask(dev, DMA_BIT_MASK(32)) in xhci_gen_setup().
Otherwise, the xHCI controller will be died after a usb device is
connected if it runs on above 4GB physical memory environment.
So, this patch adds a new quirk XHCI_NO_64BIT_SUPPORT to resolve
such an issue.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Reviewed-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/host/xhci.c | 10 ++++++++++
drivers/usb/host/xhci.h | 1 +
2 files changed, 11 insertions(+)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -4944,6 +4944,16 @@ int xhci_gen_setup(struct usb_hcd *hcd,
return retval;
xhci_dbg(xhci, "Reset complete\n");
+ /*
+ * On some xHCI controllers (e.g. R-Car SoCs), the AC64 bit (bit 0)
+ * of HCCPARAMS1 is set to 1. However, the xHCs don't support 64-bit
+ * address memory pointers actually. So, this driver clears the AC64
+ * bit of xhci->hcc_params to call dma_set_coherent_mask(dev,
+ * DMA_BIT_MASK(32)) in this xhci_gen_setup().
+ */
+ if (xhci->quirks & XHCI_NO_64BIT_SUPPORT)
+ xhci->hcc_params &= ~BIT(0);
+
/* Set dma_mask and coherent_dma_mask to 64-bits,
* if xHC supports 64-bit addressing */
if (HCC_64BIT_ADDR(xhci->hcc_params) &&
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1632,6 +1632,7 @@ struct xhci_hcd {
#define XHCI_PME_STUCK_QUIRK (1 << 20)
#define XHCI_MTK_HOST (1 << 21)
#define XHCI_SSIC_PORT_UNUSED (1 << 22)
+#define XHCI_NO_64BIT_SUPPORT (1 << 23)
unsigned int num_active_eps;
unsigned int limit_active_eps;
/* There are two roothubs to keep track of bus suspend info for */
Patches currently in stable-queue which might be from yoshihiro.shimoda.uh@xxxxxxxxxxx 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
--
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