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a53469a68e
power off the phy should be done before populate the phy. Otherwise,
am335x_init() could be called by the phy owner to power on the phy first,
then am335x_phy_probe() turns off the phy again without the caller knowing
it.
Fixes: 2fc711d763 ("usb: phy: am335x: Enable USB remote wakeup using PHY wakeup")
Cc: stable@vger.kernel.org # v3.18+
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
147 lines
3.7 KiB
C
147 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/dma-mapping.h>
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#include <linux/usb/otg.h>
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#include <linux/usb/usb_phy_generic.h>
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#include <linux/slab.h>
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#include <linux/clk.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/usb/of.h>
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#include "phy-am335x-control.h"
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#include "phy-generic.h"
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struct am335x_phy {
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struct usb_phy_generic usb_phy_gen;
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struct phy_control *phy_ctrl;
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int id;
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enum usb_dr_mode dr_mode;
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};
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static int am335x_init(struct usb_phy *phy)
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{
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struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true);
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return 0;
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}
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static void am335x_shutdown(struct usb_phy *phy)
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{
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struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
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}
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static int am335x_phy_probe(struct platform_device *pdev)
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{
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struct am335x_phy *am_phy;
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struct device *dev = &pdev->dev;
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int ret;
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am_phy = devm_kzalloc(dev, sizeof(*am_phy), GFP_KERNEL);
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if (!am_phy)
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return -ENOMEM;
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am_phy->phy_ctrl = am335x_get_phy_control(dev);
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if (!am_phy->phy_ctrl)
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return -EPROBE_DEFER;
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am_phy->id = of_alias_get_id(pdev->dev.of_node, "phy");
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if (am_phy->id < 0) {
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dev_err(&pdev->dev, "Missing PHY id: %d\n", am_phy->id);
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return am_phy->id;
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}
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am_phy->dr_mode = of_usb_get_dr_mode_by_phy(pdev->dev.of_node, -1);
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ret = usb_phy_gen_create_phy(dev, &am_phy->usb_phy_gen, NULL);
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if (ret)
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return ret;
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am_phy->usb_phy_gen.phy.init = am335x_init;
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am_phy->usb_phy_gen.phy.shutdown = am335x_shutdown;
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platform_set_drvdata(pdev, am_phy);
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device_init_wakeup(dev, true);
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/*
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* If we leave PHY wakeup enabled then AM33XX wakes up
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* immediately from DS0. To avoid this we mark dev->power.can_wakeup
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* to false. The same is checked in suspend routine to decide
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* on whether to enable PHY wakeup or not.
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* PHY wakeup works fine in standby mode, there by allowing us to
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* handle remote wakeup, wakeup on disconnect and connect.
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*/
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device_set_wakeup_enable(dev, false);
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
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return usb_add_phy_dev(&am_phy->usb_phy_gen.phy);
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}
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static int am335x_phy_remove(struct platform_device *pdev)
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{
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struct am335x_phy *am_phy = platform_get_drvdata(pdev);
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usb_remove_phy(&am_phy->usb_phy_gen.phy);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int am335x_phy_suspend(struct device *dev)
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{
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struct am335x_phy *am_phy = dev_get_drvdata(dev);
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/*
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* Enable phy wakeup only if dev->power.can_wakeup is true.
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* Make sure to enable wakeup to support remote wakeup in
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* standby mode ( same is not supported in OFF(DS0) mode).
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* Enable it by doing
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* echo enabled > /sys/bus/platform/devices/<usb-phy-id>/power/wakeup
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*/
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if (device_may_wakeup(dev))
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phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, true);
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
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return 0;
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}
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static int am335x_phy_resume(struct device *dev)
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{
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struct am335x_phy *am_phy = dev_get_drvdata(dev);
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phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true);
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if (device_may_wakeup(dev))
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phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, false);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(am335x_pm_ops, am335x_phy_suspend, am335x_phy_resume);
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static const struct of_device_id am335x_phy_ids[] = {
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{ .compatible = "ti,am335x-usb-phy" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, am335x_phy_ids);
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static struct platform_driver am335x_phy_driver = {
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.probe = am335x_phy_probe,
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.remove = am335x_phy_remove,
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.driver = {
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.name = "am335x-phy-driver",
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.pm = &am335x_pm_ops,
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.of_match_table = am335x_phy_ids,
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},
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};
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module_platform_driver(am335x_phy_driver);
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MODULE_LICENSE("GPL v2");
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