renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-30 16:13:54 +08:00
Code

USB: EHCI: remove PORT_RWC_BITS when clearing USB_PORT_FEAT_ENABLE

Browse Source 
In the ClearPortFeature/USB_PORT_FEAT_ENABLE case, ehci_hub_control()
would read from status_reg, clear PORT_PE, and write the result back to
status_reg. This would clear any bits in PORT_RWC_BITS that were set in
the registers. Fix this by masking these bits off before the write.

Since this masking is common across all ClearPortFeature cases, move it
into a single early location to avoid duplicating it.

Remove the same bugfix from ehci-tegra.c's tegra_ehci_hub_control(), now
that this case is correctly handled by the core.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stephen Warren 2012-04-18 15:32:46 -06:00 committed by Greg Kroah-Hartman
parent cae18768ac
commit 6d5f89c7b4
2 changed files with 8 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/usb/host/ehci-hub.c
View File

@ -704,6 +704,7 @@ static int ehci_hub_control (
goto error; goto error;
wIndex--; wIndex--;
temp = ehci_readl(ehci, status_reg); temp = ehci_readl(ehci, status_reg);
temp &= ~PORT_RWC_BITS;
/* /*
* Even if OWNER is set, so the port is owned by the * Even if OWNER is set, so the port is owned by the
@ -717,8 +718,7 @@ static int ehci_hub_control (
ehci_writel(ehci, temp & ~PORT_PE, status_reg); ehci_writel(ehci, temp & ~PORT_PE, status_reg);
break; break;
case USB_PORT_FEAT_C_ENABLE: case USB_PORT_FEAT_C_ENABLE:
ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_PEC, ehci_writel(ehci, temp | PORT_PEC, status_reg);
status_reg);
break; break;
case USB_PORT_FEAT_SUSPEND: case USB_PORT_FEAT_SUSPEND:
if (temp & PORT_RESET) if (temp & PORT_RESET)
@ -747,7 +747,7 @@ static int ehci_hub_control (
spin_lock_irqsave(&ehci->lock, flags); spin_lock_irqsave(&ehci->lock, flags);
} }
/* resume signaling for 20 msec */ /* resume signaling for 20 msec */
temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS); temp &= ~PORT_WAKE_BITS;
ehci_writel(ehci, temp | PORT_RESUME, status_reg); ehci_writel(ehci, temp | PORT_RESUME, status_reg);
ehci->reset_done[wIndex] = jiffies ehci->reset_done[wIndex] = jiffies
+ msecs_to_jiffies(20); + msecs_to_jiffies(20);
@ -757,9 +757,8 @@ static int ehci_hub_control (
break; break;
case USB_PORT_FEAT_POWER: case USB_PORT_FEAT_POWER:
if (HCS_PPC (ehci->hcs_params)) if (HCS_PPC (ehci->hcs_params))
ehci_writel(ehci, ehci_writel(ehci, temp & ~PORT_POWER,
temp & ~(PORT_RWC_BITS | PORT_POWER), status_reg);
status_reg);
break; break;
case USB_PORT_FEAT_C_CONNECTION: case USB_PORT_FEAT_C_CONNECTION:
if (ehci->has_lpm) { if (ehci->has_lpm) {
@ -767,12 +766,10 @@ static int ehci_hub_control (
temp &= ~PORT_LPM; temp &= ~PORT_LPM;
temp &= ~PORT_DEV_ADDR; temp &= ~PORT_DEV_ADDR;
} }
ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC, ehci_writel(ehci, temp | PORT_CSC, status_reg);
status_reg);
break; break;
case USB_PORT_FEAT_C_OVER_CURRENT: case USB_PORT_FEAT_C_OVER_CURRENT:
ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_OCC, ehci_writel(ehci, temp | PORT_OCC, status_reg);
status_reg);
break; break;
case USB_PORT_FEAT_C_RESET: case USB_PORT_FEAT_C_RESET:
/* GetPortStatus clears reset */ /* GetPortStatus clears reset */

13
drivers/usb/host/ehci-tegra.c
View File

@ -148,18 +148,7 @@ static int tegra_ehci_hub_control(
spin_lock_irqsave(&ehci->lock, flags); spin_lock_irqsave(&ehci->lock, flags);
/* if (typeReq == GetPortStatus) {
* In ehci_hub_control() for USB_PORT_FEAT_ENABLE clears the other bits
* that are write on clear, by writing back the register read value, so
* USB_PORT_FEAT_ENABLE is handled by masking the set on clear bits
*/
if (typeReq == ClearPortFeature && wValue == USB_PORT_FEAT_ENABLE) {
temp = ehci_readl(ehci, status_reg) & ~PORT_RWC_BITS;
ehci_writel(ehci, temp & ~PORT_PE, status_reg);
goto done;
}
else if (typeReq == GetPortStatus) {
temp = ehci_readl(ehci, status_reg); temp = ehci_readl(ehci, status_reg);
if (tegra->port_resuming && !(temp & PORT_SUSPEND)) { if (tegra->port_resuming && !(temp & PORT_SUSPEND)) {
/* Resume completed, re-enable disconnect detection */ /* Resume completed, re-enable disconnect detection */