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usb: host: add has_tdi_phy_lpm capability bit

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The has_hostpc capability bit indicates that the host controller has the
HOSTPC register extensions, but at the same time enables clock disabling
power saving features with the PHY Low Power Clock Disable (PHCD) bit.

However, some host controllers have the HOSTPC extensions but don't
support the low-power feature, so the PHCD bit must not be set on those
controllers. Add a separate capability bit for the low-power feature
instead, and change all existing users of has_hostpc to use this new
capability bit.

The idea for this commit is taken from an old 2012 commit that never got
merged ("disociate chipidea PHY low power suspend control from hostpc")

Inspired-by: Matthieu CASTET <matthieu.castet@parrot.com>
Signed-off-by: Tuomas Tynkkynen <ttynkkynen@nvidia.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Tuomas Tynkkynen 2013-08-12 16:06:49 +03:00 committed by Felipe Balbi
parent 23381db7ce
commit 2cdcec4fed
3 changed files with 9 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/usb/chipidea/host.c
View File

@ -63,6 +63,7 @@ static int host_start(struct ci_hdrc *ci)
ehci = hcd_to_ehci(hcd);
ehci->caps = ci->hw_bank.cap;
ehci->has_hostpc = ci->hw_bank.lpm;
ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
ret = usb_add_hcd(hcd, 0, 0);
if (ret)

14
drivers/usb/host/ehci-hub.c
View File

@ -183,7 +183,7 @@ static void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
spin_lock_irq(&ehci->lock);
/* clear phy low-power mode before changing wakeup flags */
if (ehci->has_hostpc) {
if (ehci->has_tdi_phy_lpm) {
port = HCS_N_PORTS(ehci->hcs_params);
while (port--) {
u32 __iomem *hostpc_reg = &ehci->regs->hostpc[port];
@ -217,7 +217,7 @@ static void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
}
/* enter phy low-power mode again */
if (ehci->has_hostpc) {
if (ehci->has_tdi_phy_lpm) {
port = HCS_N_PORTS(ehci->hcs_params);
while (port--) {
u32 __iomem *hostpc_reg = &ehci->regs->hostpc[port];
@ -309,7 +309,7 @@ static int ehci_bus_suspend (struct usb_hcd *hcd)
}
}
if (changed && ehci->has_hostpc) {
if (changed && ehci->has_tdi_phy_lpm) {
spin_unlock_irq(&ehci->lock);
msleep(5); /* 5 ms for HCD to enter low-power mode */
spin_lock_irq(&ehci->lock);
@ -435,7 +435,7 @@ static int ehci_bus_resume (struct usb_hcd *hcd)
goto shutdown;
/* clear phy low-power mode before resume */
if (ehci->bus_suspended && ehci->has_hostpc) {
if (ehci->bus_suspended && ehci->has_tdi_phy_lpm) {
i = HCS_N_PORTS(ehci->hcs_params);
while (i--) {
if (test_bit(i, &ehci->bus_suspended)) {
@ -788,7 +788,7 @@ static int ehci_hub_control (
goto error;
/* clear phy low-power mode before resume */
if (ehci->has_hostpc) {
if (ehci->has_tdi_phy_lpm) {
temp1 = ehci_readl(ehci, hostpc_reg);
ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
hostpc_reg);
@ -1032,12 +1032,12 @@ static int ehci_hub_control (
/* After above check the port must be connected.
* Set appropriate bit thus could put phy into low power
* mode if we have hostpc feature
* mode if we have tdi_phy_lpm feature
*/
temp &= ~PORT_WKCONN_E;
temp |= PORT_WKDISC_E | PORT_WKOC_E;
ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
if (ehci->has_hostpc) {
if (ehci->has_tdi_phy_lpm) {
spin_unlock_irqrestore(&ehci->lock, flags);
msleep(5);/* 5ms for HCD enter low pwr mode */
spin_lock_irqsave(&ehci->lock, flags);

1
drivers/usb/host/ehci.h
View File

@ -210,6 +210,7 @@ struct ehci_hcd { /* one per controller */
#define OHCI_HCCTRL_LEN 0x4
__hc32 *ohci_hcctrl_reg;
unsigned has_hostpc:1;
unsigned has_tdi_phy_lpm:1;
unsigned has_ppcd:1; /* support per-port change bits */
u8 sbrn; /* packed release number */