提交 48f24970 编写于 作者: A Alek Du 提交者: Greg Kroah-Hartman

USB: EHCI: EHCI 1.1 addendum: Basic LPM feature support

With this patch, the LPM capable EHCI host controller can put device
into L1 sleep state which is a mode that can enter/exit quickly, and
reduce power consumption.
Signed-off-by: NJacob Pan <jacob.jun.pan@intel.com>
Signed-off-by: NAlek Du <alek.du@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
上级 aa4d8342
......@@ -2880,7 +2880,9 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
}
retval = 0;
/* notify HCD that we have a device connected and addressed */
if (hcd->driver->update_device)
hcd->driver->update_device(hcd, udev);
fail:
if (retval) {
hub_port_disable(hub, port1, 0);
......
......@@ -101,6 +101,11 @@ static int ignore_oc = 0;
module_param (ignore_oc, bool, S_IRUGO);
MODULE_PARM_DESC (ignore_oc, "ignore bogus hardware overcurrent indications");
/* for link power management(LPM) feature */
static unsigned int hird;
module_param(hird, int, S_IRUGO);
MODULE_PARM_DESC(hird, "host initiated resume duration, +1 for each 75us\n");
#define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT)
/*-------------------------------------------------------------------------*/
......@@ -305,6 +310,7 @@ static void end_unlink_async(struct ehci_hcd *ehci);
static void ehci_work(struct ehci_hcd *ehci);
#include "ehci-hub.c"
#include "ehci-lpm.c"
#include "ehci-mem.c"
#include "ehci-q.c"
#include "ehci-sched.c"
......@@ -604,6 +610,17 @@ static int ehci_init(struct usb_hcd *hcd)
default: BUG();
}
}
if (HCC_LPM(hcc_params)) {
/* support link power management EHCI 1.1 addendum */
ehci_dbg(ehci, "support lpm\n");
ehci->has_lpm = 1;
if (hird > 0xf) {
ehci_dbg(ehci, "hird %d invalid, use default 0",
hird);
hird = 0;
}
temp |= hird << 24;
}
ehci->command = temp;
/* Accept arbitrarily long scatter-gather lists */
......
......@@ -790,6 +790,11 @@ static int ehci_hub_control (
status_reg);
break;
case USB_PORT_FEAT_C_CONNECTION:
if (ehci->has_lpm) {
/* clear PORTSC bits on disconnect */
temp &= ~PORT_LPM;
temp &= ~PORT_DEV_ADDR;
}
ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
status_reg);
break;
......
/* ehci-lpm.c EHCI HCD LPM support code
* Copyright (c) 2008 - 2010, Intel Corporation.
* Author: Jacob Pan <jacob.jun.pan@intel.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* this file is part of ehci-hcd.c */
static int ehci_lpm_set_da(struct ehci_hcd *ehci, int dev_addr, int port_num)
{
u32 __iomem portsc;
ehci_dbg(ehci, "set dev address %d for port %d\n", dev_addr, port_num);
if (port_num > HCS_N_PORTS(ehci->hcs_params)) {
ehci_dbg(ehci, "invalid port number %d\n", port_num);
return -ENODEV;
}
portsc = ehci_readl(ehci, &ehci->regs->port_status[port_num-1]);
portsc &= ~PORT_DEV_ADDR;
portsc |= dev_addr<<25;
ehci_writel(ehci, portsc, &ehci->regs->port_status[port_num-1]);
return 0;
}
/*
* this function is used to check if the device support LPM
* if yes, mark the PORTSC register with PORT_LPM bit
*/
static int ehci_lpm_check(struct ehci_hcd *ehci, int port)
{
u32 __iomem *portsc ;
u32 val32;
int retval;
portsc = &ehci->regs->port_status[port-1];
val32 = ehci_readl(ehci, portsc);
if (!(val32 & PORT_DEV_ADDR)) {
ehci_dbg(ehci, "LPM: no device attached\n");
return -ENODEV;
}
val32 |= PORT_LPM;
ehci_writel(ehci, val32, portsc);
msleep(5);
val32 |= PORT_SUSPEND;
ehci_dbg(ehci, "Sending LPM 0x%08x to port %d\n", val32, port);
ehci_writel(ehci, val32, portsc);
/* wait for ACK */
msleep(10);
retval = handshake(ehci, &ehci->regs->port_status[port-1], PORT_SSTS,
PORTSC_SUSPEND_STS_ACK, 125);
dbg_port(ehci, "LPM", port, val32);
if (retval != -ETIMEDOUT) {
ehci_dbg(ehci, "LPM: device ACK for LPM\n");
val32 |= PORT_LPM;
/*
* now device should be in L1 sleep, let's wake up the device
* so that we can complete enumeration.
*/
ehci_writel(ehci, val32, portsc);
msleep(10);
val32 |= PORT_RESUME;
ehci_writel(ehci, val32, portsc);
} else {
ehci_dbg(ehci, "LPM: device does not ACK, disable LPM %d\n",
retval);
val32 &= ~PORT_LPM;
retval = -ETIMEDOUT;
ehci_writel(ehci, val32, portsc);
}
return retval;
}
......@@ -361,6 +361,22 @@ static int ehci_pci_resume(struct usb_hcd *hcd, bool hibernated)
}
#endif
static int ehci_update_device(struct usb_hcd *hcd, struct usb_device *udev)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
int rc = 0;
if (!udev->parent) /* udev is root hub itself, impossible */
rc = -1;
/* we only support lpm device connected to root hub yet */
if (ehci->has_lpm && !udev->parent->parent) {
rc = ehci_lpm_set_da(ehci, udev->devnum, udev->portnum);
if (!rc)
rc = ehci_lpm_check(ehci, udev->portnum);
}
return rc;
}
static const struct hc_driver ehci_pci_hc_driver = {
.description = hcd_name,
.product_desc = "EHCI Host Controller",
......@@ -407,6 +423,11 @@ static const struct hc_driver ehci_pci_hc_driver = {
.relinquish_port = ehci_relinquish_port,
.port_handed_over = ehci_port_handed_over,
/*
* call back when device connected and addressed
*/
.update_device = ehci_update_device,
.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};
......
......@@ -140,7 +140,7 @@ struct ehci_hcd { /* one per controller */
#define OHCI_HCCTRL_LEN 0x4
__hc32 *ohci_hcctrl_reg;
unsigned has_hostpc:1;
unsigned has_lpm:1; /* support link power management */
u8 sbrn; /* packed release number */
/* irq statistics */
......
......@@ -300,6 +300,10 @@ struct hc_driver {
int (*update_hub_device)(struct usb_hcd *, struct usb_device *hdev,
struct usb_tt *tt, gfp_t mem_flags);
int (*reset_device)(struct usb_hcd *, struct usb_device *);
/* Notifies the HCD after a device is connected and its
* address is set
*/
int (*update_device)(struct usb_hcd *, struct usb_device *);
};
extern int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb);
......
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