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[PATCH] USB: ehci power fixes

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Miscellaneous updates for EHCI.

 - Mostly updates the power switching on EHCI controllers.  One routine
   centralizes the "power on/off all ports" logic, and the capability to
   do that is reported more correctly.

 - Courtesy Colin Leroy, a patch to always power up ports after resumes
   which didn't keep a USB device suspended.  The reset-everything logic
   powers down those ports (on some hardware) so something needs to turn
   them back on.

 - Minor tweaks/bugfixes for the debug port support.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
David Brownell
2005-04-09 09:00:29 -07:00
committed by Greg KH
parent e2e66446e0
commit 56c1e26d75
3 changed files with 56 additions and 30 deletions
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65
drivers/usb/host/ehci-hcd.c
View File

@@ -346,6 +346,22 @@ ehci_reboot (struct notifier_block *self, unsigned long code, void *null)
return 0;
}
static void ehci_port_power (struct ehci_hcd *ehci, int is_on)
{
unsigned port;
if (!HCS_PPC (ehci->hcs_params))
return;
ehci_dbg (ehci, "...power%s ports...\n", is_on ? "up" : "down");
for (port = HCS_N_PORTS (ehci->hcs_params); port > 0; )
(void) ehci_hub_control(ehci_to_hcd(ehci),
is_on ? SetPortFeature : ClearPortFeature,
USB_PORT_FEAT_POWER,
port--, NULL, 0);
msleep(20);
}
/* called by khubd or root hub init threads */
@@ -362,8 +378,10 @@ static int ehci_hc_reset (struct usb_hcd *hcd)
dbg_hcs_params (ehci, "reset");
dbg_hcc_params (ehci, "reset");
/* cache this readonly data; minimize chip reads */
ehci->hcs_params = readl (&ehci->caps->hcs_params);
#ifdef CONFIG_PCI
/* EHCI 0.96 and later may have "extended capabilities" */
if (hcd->self.controller->bus == &pci_bus_type) {
struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
@@ -383,9 +401,30 @@ static int ehci_hc_reset (struct usb_hcd *hcd)
break;
}
/* optional debug port, normally in the first BAR */
temp = pci_find_capability (pdev, 0x0a);
if (temp) {
pci_read_config_dword(pdev, temp, &temp);
temp >>= 16;
if ((temp & (3 << 13)) == (1 << 13)) {
temp &= 0x1fff;
ehci->debug = hcd->regs + temp;
temp = readl (&ehci->debug->control);
ehci_info (ehci, "debug port %d%s\n",
HCS_DEBUG_PORT(ehci->hcs_params),
(temp & DBGP_ENABLED)
? " IN USE"
: "");
if (!(temp & DBGP_ENABLED))
ehci->debug = NULL;
}
}
temp = HCC_EXT_CAPS (readl (&ehci->caps->hcc_params));
} else
temp = 0;
/* EHCI 0.96 and later may have "extended capabilities" */
while (temp && count--) {
u32 cap;
@@ -414,8 +453,7 @@ static int ehci_hc_reset (struct usb_hcd *hcd)
ehci_reset (ehci);
#endif
/* cache this readonly data; minimize PCI reads */
ehci->hcs_params = readl (&ehci->caps->hcs_params);
ehci_port_power (ehci, 0);
/* at least the Genesys GL880S needs fixup here */
temp = HCS_N_CC(ehci->hcs_params) * HCS_N_PCC(ehci->hcs_params);
@@ -657,16 +695,11 @@ done2:
static void ehci_stop (struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
u8 rh_ports, port;
ehci_dbg (ehci, "stop\n");
/* Turn off port power on all root hub ports. */
rh_ports = HCS_N_PORTS (ehci->hcs_params);
for (port = 1; port <= rh_ports; port++)
(void) ehci_hub_control(hcd,
ClearPortFeature, USB_PORT_FEAT_POWER,
port, NULL, 0);
ehci_port_power (ehci, 0);
/* no more interrupts ... */
del_timer_sync (&ehci->watchdog);
@@ -748,7 +781,6 @@ static int ehci_resume (struct usb_hcd *hcd)
unsigned port;
struct usb_device *root = hcd->self.root_hub;
int retval = -EINVAL;
int powerup = 0;
// maybe restore (PCI) FLADJ
@@ -766,8 +798,6 @@ static int ehci_resume (struct usb_hcd *hcd)
up (&hcd->self.root_hub->serialize);
break;
}
if ((status & PORT_POWER) == 0)
powerup = 1;
if (!root->children [port])
continue;
dbg_port (ehci, __FUNCTION__, port + 1, status);
@@ -794,16 +824,9 @@ static int ehci_resume (struct usb_hcd *hcd)
retval = ehci_start (hcd);
/* here we "know" root ports should always stay powered;
* but some controllers may lost all power.
* but some controllers may lose all power.
*/
if (powerup) {
ehci_dbg (ehci, "...powerup ports...\n");
for (port = HCS_N_PORTS (ehci->hcs_params); port > 0; )
(void) ehci_hub_control(hcd,
SetPortFeature, USB_PORT_FEAT_POWER,
port--, NULL, 0);
msleep(20);
}
ehci_port_power (ehci, 1);
}
return retval;