mvebu: fixup usb3 support on the a38x

Signed-off-by: Imre Kaloz <kaloz@openwrt.org>



git-svn-id: svn://svn.openwrt.org/openwrt/trunk@45026 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 61 insertions, 0 deletions

diff --git a/target/linux/mvebu/patches-3.18/210-xhci_move_marvell_quirks.patch b/target/linux/mvebu/patches-3.18/210-xhci_move_marvell_quirks.patch
new file mode 100644
index 0000000000..2296900e31
--- /dev/null
+++ b/target/linux/mvebu/patches-3.18/210-xhci_move_marvell_quirks.patch
@@ -0,0 +1,61 @@
+From 1e7e4fb66489cc84366656ca5318f1cb61afd4ba Mon Sep 17 00:00:00 2001
+From: Maxime Ripard <maxime.ripard@free-electrons.com>
+Date: Tue, 24 Feb 2015 18:27:00 +0200
+Subject: usb: XHCI: platform: Move the Marvell quirks after the enabling the
+ clocks
+
+The commit 973747928514 ("usb: host: xhci-plat: add support for the Armada
+375/38x XHCI controllers") extended the xhci-plat driver to support the Armada
+375/38x SoCs, mostly by adding a quirk configuring the MBUS window.
+
+However, that quirk was run before the clock the controllers needs has been
+enabled. This usually worked because the clock was first enabled by the
+bootloader, and left as such until the driver is probe, where it tries to
+access the MBUS configuration registers before enabling the clock.
+
+Things get messy when EPROBE_DEFER is involved during the probe, since as part
+of its error path, the driver will rightfully disable the clock. When the
+driver will be reprobed, it will retry to access the MBUS registers, but this
+time with the clock disabled, which hangs forever.
+
+Fix this by running the quirks after the clock has been enabled by the driver.
+
+Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
+Cc: <stable@vger.kernel.org> # v3.16+
+Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+--- a/drivers/usb/host/xhci-plat.c
++++ b/drivers/usb/host/xhci-plat.c
+@@ -87,15 +87,6 @@ static int xhci_plat_probe(struct platfo
+ 	if (!res)
+ 		return -ENODEV;
+ 
+-	if (of_device_is_compatible(pdev->dev.of_node,
+-				    "marvell,armada-375-xhci") ||
+-	    of_device_is_compatible(pdev->dev.of_node,
+-				    "marvell,armada-380-xhci")) {
+-		ret = xhci_mvebu_mbus_init_quirk(pdev);
+-		if (ret)
+-			return ret;
+-	}
+-
+ 	/* Initialize dma_mask and coherent_dma_mask to 32-bits */
+ 	ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
+ 	if (ret)
+@@ -129,6 +120,15 @@ static int xhci_plat_probe(struct platfo
+ 			goto put_hcd;
+ 	}
+ 
++	if (of_device_is_compatible(pdev->dev.of_node,
++				    "marvell,armada-375-xhci") ||
++	    of_device_is_compatible(pdev->dev.of_node,
++				    "marvell,armada-380-xhci")) {
++		ret = xhci_mvebu_mbus_init_quirk(pdev);
++		if (ret)
++			return ret;
++	}
++
+ 	ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
+ 	if (ret)
+ 		goto disable_clk;