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usb: core: lpm: fix usb3_hardware_lpm sysfs node
Commit655fe4effe("usbcore: add sysfs support to xHCI usb3 hardware LPM") introduced usb3_hardware_lpm sysfs node. This doesn't show the correct status of USB3 U1 and U2 LPM status. This patch fixes this by replacing usb3_hardware_lpm with two nodes, usb3_hardware_lpm_u1 (for U1) and usb3_hardware_lpm_u2 (for U2), and recording the U1/U2 LPM status in right places. This patch should be back-ported to kernels as old as 4.3, that contains Commit655fe4effe("usbcore: add sysfs support to xHCI usb3 hardware LPM"). Cc: stable@vger.kernel.org Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lu Baolu
Greg Kroah-Hartman
parent
c56a2b2bc6
commit
bf5ce5bf3c
@ -134,19 +134,21 @@ Description:
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enabled for the device. Developer can write y/Y/1 or n/N/0 to
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the file to enable/disable the feature.
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What: /sys/bus/usb/devices/.../power/usb3_hardware_lpm
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Date: June 2015
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What: /sys/bus/usb/devices/.../power/usb3_hardware_lpm_u1
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/sys/bus/usb/devices/.../power/usb3_hardware_lpm_u2
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Date: November 2015
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Contact: Kevin Strasser <kevin.strasser@linux.intel.com>
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Lu Baolu <baolu.lu@linux.intel.com>
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Description:
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If CONFIG_PM is set and a USB 3.0 lpm-capable device is plugged
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in to a xHCI host which supports link PM, it will check if U1
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and U2 exit latencies have been set in the BOS descriptor; if
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the check is is passed and the host supports USB3 hardware LPM,
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the check is passed and the host supports USB3 hardware LPM,
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USB3 hardware LPM will be enabled for the device and the USB
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device directory will contain a file named
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power/usb3_hardware_lpm. The file holds a string value (enable
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or disable) indicating whether or not USB3 hardware LPM is
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enabled for the device.
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device directory will contain two files named
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power/usb3_hardware_lpm_u1 and power/usb3_hardware_lpm_u2. These
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files hold a string value (enable or disable) indicating whether
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or not USB3 hardware LPM U1 or U2 is enabled for the device.
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What: /sys/bus/usb/devices/.../removable
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Date: February 2012
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@ -537,17 +537,18 @@ relevant attribute files are usb2_hardware_lpm and usb3_hardware_lpm.
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can write y/Y/1 or n/N/0 to the file to enable/disable
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USB2 hardware LPM manually. This is for test purpose mainly.
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power/usb3_hardware_lpm
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power/usb3_hardware_lpm_u1
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power/usb3_hardware_lpm_u2
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When a USB 3.0 lpm-capable device is plugged in to a
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xHCI host which supports link PM, it will check if U1
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and U2 exit latencies have been set in the BOS
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descriptor; if the check is is passed and the host
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supports USB3 hardware LPM, USB3 hardware LPM will be
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enabled for the device and this file will be created.
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The file holds a string value (enable or disable)
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indicating whether or not USB3 hardware LPM is
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enabled for the device.
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enabled for the device and these files will be created.
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The files hold a string value (enable or disable)
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indicating whether or not USB3 hardware LPM U1 or U2
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is enabled for the device.
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USB Port Power Control
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----------------------
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@ -3875,17 +3875,30 @@ static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev,
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return;
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}
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if (usb_set_lpm_timeout(udev, state, timeout))
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if (usb_set_lpm_timeout(udev, state, timeout)) {
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/* If we can't set the parent hub U1/U2 timeout,
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* device-initiated LPM won't be allowed either, so let the xHCI
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* host know that this link state won't be enabled.
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*/
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hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state);
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} else {
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/* Only a configured device will accept the Set Feature
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* U1/U2_ENABLE
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*/
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if (udev->actconfig)
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usb_set_device_initiated_lpm(udev, state, true);
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/* Only a configured device will accept the Set Feature U1/U2_ENABLE */
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else if (udev->actconfig)
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usb_set_device_initiated_lpm(udev, state, true);
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/* As soon as usb_set_lpm_timeout(timeout) returns 0, the
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* hub-initiated LPM is enabled. Thus, LPM is enabled no
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* matter the result of usb_set_device_initiated_lpm().
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* The only difference is whether device is able to initiate
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* LPM.
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*/
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if (state == USB3_LPM_U1)
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udev->usb3_lpm_u1_enabled = 1;
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else if (state == USB3_LPM_U2)
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udev->usb3_lpm_u2_enabled = 1;
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}
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}
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/*
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@ -3925,6 +3938,18 @@ static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev,
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dev_warn(&udev->dev, "Could not disable xHCI %s timeout, "
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"bus schedule bandwidth may be impacted.\n",
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usb3_lpm_names[state]);
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/* As soon as usb_set_lpm_timeout(0) return 0, hub initiated LPM
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* is disabled. Hub will disallows link to enter U1/U2 as well,
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* even device is initiating LPM. Hence LPM is disabled if hub LPM
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* timeout set to 0, no matter device-initiated LPM is disabled or
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* not.
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*/
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if (state == USB3_LPM_U1)
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udev->usb3_lpm_u1_enabled = 0;
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else if (state == USB3_LPM_U2)
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udev->usb3_lpm_u2_enabled = 0;
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return 0;
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}
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@ -3959,8 +3984,6 @@ int usb_disable_lpm(struct usb_device *udev)
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if (usb_disable_link_state(hcd, udev, USB3_LPM_U2))
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goto enable_lpm;
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udev->usb3_lpm_enabled = 0;
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return 0;
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enable_lpm:
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@ -4018,8 +4041,6 @@ void usb_enable_lpm(struct usb_device *udev)
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usb_enable_link_state(hcd, udev, USB3_LPM_U1);
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usb_enable_link_state(hcd, udev, USB3_LPM_U2);
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udev->usb3_lpm_enabled = 1;
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}
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EXPORT_SYMBOL_GPL(usb_enable_lpm);
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@ -531,7 +531,7 @@ static ssize_t usb2_lpm_besl_store(struct device *dev,
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}
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static DEVICE_ATTR_RW(usb2_lpm_besl);
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static ssize_t usb3_hardware_lpm_show(struct device *dev,
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static ssize_t usb3_hardware_lpm_u1_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct usb_device *udev = to_usb_device(dev);
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@ -539,7 +539,7 @@ static ssize_t usb3_hardware_lpm_show(struct device *dev,
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usb_lock_device(udev);
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if (udev->usb3_lpm_enabled)
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if (udev->usb3_lpm_u1_enabled)
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p = "enabled";
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else
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p = "disabled";
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@ -548,7 +548,26 @@ static ssize_t usb3_hardware_lpm_show(struct device *dev,
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return sprintf(buf, "%s\n", p);
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}
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static DEVICE_ATTR_RO(usb3_hardware_lpm);
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static DEVICE_ATTR_RO(usb3_hardware_lpm_u1);
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static ssize_t usb3_hardware_lpm_u2_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct usb_device *udev = to_usb_device(dev);
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const char *p;
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usb_lock_device(udev);
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if (udev->usb3_lpm_u2_enabled)
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p = "enabled";
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else
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p = "disabled";
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usb_unlock_device(udev);
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return sprintf(buf, "%s\n", p);
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}
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static DEVICE_ATTR_RO(usb3_hardware_lpm_u2);
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static struct attribute *usb2_hardware_lpm_attr[] = {
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&dev_attr_usb2_hardware_lpm.attr,
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@ -562,7 +581,8 @@ static struct attribute_group usb2_hardware_lpm_attr_group = {
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};
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static struct attribute *usb3_hardware_lpm_attr[] = {
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&dev_attr_usb3_hardware_lpm.attr,
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&dev_attr_usb3_hardware_lpm_u1.attr,
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&dev_attr_usb3_hardware_lpm_u2.attr,
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NULL,
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};
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static struct attribute_group usb3_hardware_lpm_attr_group = {
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@ -592,7 +612,8 @@ static int add_power_attributes(struct device *dev)
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if (udev->usb2_hw_lpm_capable == 1)
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rc = sysfs_merge_group(&dev->kobj,
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&usb2_hardware_lpm_attr_group);
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if (udev->lpm_capable == 1)
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if (udev->speed == USB_SPEED_SUPER &&
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udev->lpm_capable == 1)
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rc = sysfs_merge_group(&dev->kobj,
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&usb3_hardware_lpm_attr_group);
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}
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@ -511,6 +511,8 @@ struct usb3_lpm_parameters {
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* @usb2_hw_lpm_enabled: USB2 hardware LPM is enabled
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* @usb2_hw_lpm_allowed: Userspace allows USB 2.0 LPM to be enabled
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* @usb3_lpm_enabled: USB3 hardware LPM enabled
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* @usb3_lpm_u1_enabled: USB3 hardware U1 LPM enabled
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* @usb3_lpm_u2_enabled: USB3 hardware U2 LPM enabled
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* @string_langid: language ID for strings
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* @product: iProduct string, if present (static)
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* @manufacturer: iManufacturer string, if present (static)
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@ -584,6 +586,8 @@ struct usb_device {
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unsigned usb2_hw_lpm_enabled:1;
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unsigned usb2_hw_lpm_allowed:1;
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unsigned usb3_lpm_enabled:1;
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unsigned usb3_lpm_u1_enabled:1;
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unsigned usb3_lpm_u2_enabled:1;
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int string_langid;
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/* static strings from the device */
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