forked from Minki/linux
dcc7620cad
Upstream commit 98d74f9cea ("xhci: fix 10 second timeout on removal of
PCI hotpluggable xhci controllers") fixes a problem with hot pluggable PCI
xhci controllers which can result in excessive timeouts, to the point where
the system reports a deadlock.
The same problem is seen with hot pluggable xhci controllers using the
xhci-plat driver, such as the driver used for Type-C ports on rk3399.
Similar to hot-pluggable PCI controllers, the driver for this chip
removes the xhci controller from the system when the Type-C cable is
disconnected.
The solution for PCI devices works just as well for non-PCI devices
and avoids the problem.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
371 lines
8.8 KiB
C
371 lines
8.8 KiB
C
/*
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* xhci-plat.c - xHCI host controller driver platform Bus Glue.
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*
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* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
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* Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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*
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* A lot of code borrowed from the Linux xHCI driver.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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#include <linux/clk.h>
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#include <linux/dma-mapping.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/usb/phy.h>
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#include <linux/slab.h>
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#include <linux/acpi.h>
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#include "xhci.h"
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#include "xhci-plat.h"
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#include "xhci-mvebu.h"
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#include "xhci-rcar.h"
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static struct hc_driver __read_mostly xhci_plat_hc_driver;
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static int xhci_plat_setup(struct usb_hcd *hcd);
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static int xhci_plat_start(struct usb_hcd *hcd);
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static const struct xhci_driver_overrides xhci_plat_overrides __initconst = {
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.extra_priv_size = sizeof(struct xhci_plat_priv),
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.reset = xhci_plat_setup,
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.start = xhci_plat_start,
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};
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static void xhci_priv_plat_start(struct usb_hcd *hcd)
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{
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struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
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if (priv->plat_start)
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priv->plat_start(hcd);
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}
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static int xhci_priv_init_quirk(struct usb_hcd *hcd)
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{
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struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
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if (!priv->init_quirk)
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return 0;
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return priv->init_quirk(hcd);
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}
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static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
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{
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/*
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* As of now platform drivers don't provide MSI support so we ensure
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* here that the generic code does not try to make a pci_dev from our
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* dev struct in order to setup MSI
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*/
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xhci->quirks |= XHCI_PLAT;
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}
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/* called during probe() after chip reset completes */
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static int xhci_plat_setup(struct usb_hcd *hcd)
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{
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int ret;
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ret = xhci_priv_init_quirk(hcd);
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if (ret)
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return ret;
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return xhci_gen_setup(hcd, xhci_plat_quirks);
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}
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static int xhci_plat_start(struct usb_hcd *hcd)
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{
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xhci_priv_plat_start(hcd);
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return xhci_run(hcd);
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}
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#ifdef CONFIG_OF
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static const struct xhci_plat_priv xhci_plat_marvell_armada = {
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.init_quirk = xhci_mvebu_mbus_init_quirk,
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};
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static const struct xhci_plat_priv xhci_plat_renesas_rcar_gen2 = {
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.firmware_name = XHCI_RCAR_FIRMWARE_NAME_V1,
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.init_quirk = xhci_rcar_init_quirk,
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.plat_start = xhci_rcar_start,
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};
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static const struct xhci_plat_priv xhci_plat_renesas_rcar_gen3 = {
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.firmware_name = XHCI_RCAR_FIRMWARE_NAME_V2,
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.init_quirk = xhci_rcar_init_quirk,
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.plat_start = xhci_rcar_start,
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};
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static const struct xhci_plat_priv xhci_plat_renesas_rcar_r8a7796 = {
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.firmware_name = XHCI_RCAR_FIRMWARE_NAME_V3,
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.init_quirk = xhci_rcar_init_quirk,
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.plat_start = xhci_rcar_start,
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};
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static const struct of_device_id usb_xhci_of_match[] = {
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{
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.compatible = "generic-xhci",
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}, {
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.compatible = "xhci-platform",
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}, {
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.compatible = "marvell,armada-375-xhci",
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.data = &xhci_plat_marvell_armada,
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}, {
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.compatible = "marvell,armada-380-xhci",
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.data = &xhci_plat_marvell_armada,
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}, {
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.compatible = "renesas,xhci-r8a7790",
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.data = &xhci_plat_renesas_rcar_gen2,
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}, {
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.compatible = "renesas,xhci-r8a7791",
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.data = &xhci_plat_renesas_rcar_gen2,
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}, {
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.compatible = "renesas,xhci-r8a7793",
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.data = &xhci_plat_renesas_rcar_gen2,
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}, {
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.compatible = "renesas,xhci-r8a7795",
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.data = &xhci_plat_renesas_rcar_gen3,
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}, {
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.compatible = "renesas,xhci-r8a7796",
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.data = &xhci_plat_renesas_rcar_r8a7796,
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}, {
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.compatible = "renesas,rcar-gen2-xhci",
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.data = &xhci_plat_renesas_rcar_gen2,
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}, {
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.compatible = "renesas,rcar-gen3-xhci",
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.data = &xhci_plat_renesas_rcar_gen3,
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, usb_xhci_of_match);
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#endif
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static int xhci_plat_probe(struct platform_device *pdev)
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{
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const struct of_device_id *match;
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const struct hc_driver *driver;
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struct xhci_hcd *xhci;
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struct resource *res;
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struct usb_hcd *hcd;
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struct clk *clk;
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int ret;
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int irq;
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if (usb_disabled())
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return -ENODEV;
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driver = &xhci_plat_hc_driver;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return -ENODEV;
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/* Try to set 64-bit DMA first */
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if (!pdev->dev.dma_mask)
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/* Platform did not initialize dma_mask */
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ret = dma_coerce_mask_and_coherent(&pdev->dev,
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DMA_BIT_MASK(64));
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else
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ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
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/* If seting 64-bit DMA mask fails, fall back to 32-bit DMA mask */
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if (ret) {
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ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
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if (ret)
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return ret;
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}
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hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
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if (!hcd)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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hcd->regs = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(hcd->regs)) {
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ret = PTR_ERR(hcd->regs);
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goto put_hcd;
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}
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hcd->rsrc_start = res->start;
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hcd->rsrc_len = resource_size(res);
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/*
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* Not all platforms have a clk so it is not an error if the
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* clock does not exists.
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*/
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clk = devm_clk_get(&pdev->dev, NULL);
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if (!IS_ERR(clk)) {
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ret = clk_prepare_enable(clk);
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if (ret)
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goto put_hcd;
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} else if (PTR_ERR(clk) == -EPROBE_DEFER) {
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ret = -EPROBE_DEFER;
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goto put_hcd;
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}
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xhci = hcd_to_xhci(hcd);
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match = of_match_node(usb_xhci_of_match, pdev->dev.of_node);
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if (match) {
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const struct xhci_plat_priv *priv_match = match->data;
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struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
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/* Just copy data for now */
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if (priv_match)
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*priv = *priv_match;
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}
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device_wakeup_enable(hcd->self.controller);
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xhci->clk = clk;
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xhci->main_hcd = hcd;
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xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev,
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dev_name(&pdev->dev), hcd);
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if (!xhci->shared_hcd) {
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ret = -ENOMEM;
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goto disable_clk;
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}
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if (device_property_read_bool(&pdev->dev, "usb3-lpm-capable"))
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xhci->quirks |= XHCI_LPM_SUPPORT;
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if (device_property_read_bool(&pdev->dev, "quirk-broken-port-ped"))
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xhci->quirks |= XHCI_BROKEN_PORT_PED;
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hcd->usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
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if (IS_ERR(hcd->usb_phy)) {
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ret = PTR_ERR(hcd->usb_phy);
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if (ret == -EPROBE_DEFER)
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goto put_usb3_hcd;
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hcd->usb_phy = NULL;
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} else {
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ret = usb_phy_init(hcd->usb_phy);
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if (ret)
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goto put_usb3_hcd;
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}
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ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
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if (ret)
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goto disable_usb_phy;
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if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
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xhci->shared_hcd->can_do_streams = 1;
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ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
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if (ret)
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goto dealloc_usb2_hcd;
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return 0;
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dealloc_usb2_hcd:
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usb_remove_hcd(hcd);
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disable_usb_phy:
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usb_phy_shutdown(hcd->usb_phy);
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put_usb3_hcd:
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usb_put_hcd(xhci->shared_hcd);
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disable_clk:
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if (!IS_ERR(clk))
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clk_disable_unprepare(clk);
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put_hcd:
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usb_put_hcd(hcd);
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return ret;
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}
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static int xhci_plat_remove(struct platform_device *dev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(dev);
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struct xhci_hcd *xhci = hcd_to_xhci(hcd);
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struct clk *clk = xhci->clk;
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xhci->xhc_state |= XHCI_STATE_REMOVING;
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usb_remove_hcd(xhci->shared_hcd);
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usb_phy_shutdown(hcd->usb_phy);
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usb_remove_hcd(hcd);
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usb_put_hcd(xhci->shared_hcd);
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if (!IS_ERR(clk))
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clk_disable_unprepare(clk);
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usb_put_hcd(hcd);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int xhci_plat_suspend(struct device *dev)
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{
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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struct xhci_hcd *xhci = hcd_to_xhci(hcd);
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/*
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* xhci_suspend() needs `do_wakeup` to know whether host is allowed
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* to do wakeup during suspend. Since xhci_plat_suspend is currently
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* only designed for system suspend, device_may_wakeup() is enough
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* to dertermine whether host is allowed to do wakeup. Need to
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* reconsider this when xhci_plat_suspend enlarges its scope, e.g.,
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* also applies to runtime suspend.
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*/
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return xhci_suspend(xhci, device_may_wakeup(dev));
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}
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static int xhci_plat_resume(struct device *dev)
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{
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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struct xhci_hcd *xhci = hcd_to_xhci(hcd);
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return xhci_resume(xhci, 0);
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}
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static const struct dev_pm_ops xhci_plat_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(xhci_plat_suspend, xhci_plat_resume)
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};
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#define DEV_PM_OPS (&xhci_plat_pm_ops)
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#else
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#define DEV_PM_OPS NULL
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#endif /* CONFIG_PM */
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static const struct acpi_device_id usb_xhci_acpi_match[] = {
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/* XHCI-compliant USB Controller */
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{ "PNP0D10", },
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{ }
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};
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MODULE_DEVICE_TABLE(acpi, usb_xhci_acpi_match);
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static struct platform_driver usb_xhci_driver = {
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.probe = xhci_plat_probe,
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.remove = xhci_plat_remove,
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.driver = {
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.name = "xhci-hcd",
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.pm = DEV_PM_OPS,
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.of_match_table = of_match_ptr(usb_xhci_of_match),
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.acpi_match_table = ACPI_PTR(usb_xhci_acpi_match),
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},
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};
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MODULE_ALIAS("platform:xhci-hcd");
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static int __init xhci_plat_init(void)
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{
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xhci_init_driver(&xhci_plat_hc_driver, &xhci_plat_overrides);
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return platform_driver_register(&usb_xhci_driver);
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}
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module_init(xhci_plat_init);
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static void __exit xhci_plat_exit(void)
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{
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platform_driver_unregister(&usb_xhci_driver);
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}
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module_exit(xhci_plat_exit);
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MODULE_DESCRIPTION("xHCI Platform Host Controller Driver");
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MODULE_LICENSE("GPL");
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