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[xhci] Forcibly disable SMIs if BIOS fails to release ownership 

If the BIOS fails to gracefully release ownership of the xHCI
controller, we can forcibly claim it by disabling all SMIs via the
USB legacy support control/status register.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/35/head
Michael Brown 2015-03-16 20:32:33 +00:00
parent 838ab97ce3
commit 3de0ffc887
1 changed files with 10 additions and 10 deletions
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20
src/drivers/usb/xhci.c
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@ -556,16 +556,15 @@ static void xhci_legacy_init ( struct xhci_device *xhci ) {
* Claim ownership from BIOS
*
* @v xhci xHCI device
* @ret rc Return status code
*/
static int xhci_legacy_claim ( struct xhci_device *xhci ) {
static void xhci_legacy_claim ( struct xhci_device *xhci ) {
uint32_t ctlsts;
uint8_t bios;
unsigned int i;
/* Do nothing unless legacy support capability is present */
if ( ! xhci->legacy )
return 0;
return;
/* Claim ownership */
writeb ( XHCI_USBLEGSUP_OS_OWNED,
@ -585,16 +584,19 @@ static int xhci_legacy_claim ( struct xhci_device *xhci ) {
DBGC ( xhci, "XHCI %p warning: BIOS retained "
"SMIs: %08x\n", xhci, ctlsts );
}
return 0;
return;
}
/* Delay */
mdelay ( 1 );
}
DBGC ( xhci, "XHCI %p timed out waiting for BIOS to release "
"ownership\n", xhci );
return -ETIMEDOUT;
/* BIOS did not release ownership. Claim it forcibly by
* disabling all SMIs.
*/
DBGC ( xhci, "XHCI %p could not claim ownership from BIOS: forcibly "
"disabling SMIs\n", xhci );
writel ( 0, xhci->cap + xhci->legacy + XHCI_USBLEGSUP_CTLSTS );
}
/**
@ -3105,8 +3107,7 @@ static int xhci_probe ( struct pci_device *pci ) {
/* Initialise USB legacy support and claim ownership */
xhci_legacy_init ( xhci );
if ( ( rc = xhci_legacy_claim ( xhci ) ) != 0 )
goto err_legacy_claim;
xhci_legacy_claim ( xhci );
/* Fix Intel PCH-specific quirks, if applicable */
if ( pci->id->driver_data & XHCI_PCH )
@ -3148,7 +3149,6 @@ static int xhci_probe ( struct pci_device *pci ) {
if ( pci->id->driver_data & XHCI_PCH )
xhci_pch_undo ( xhci, pci );
xhci_legacy_release ( xhci );
err_legacy_claim:
iounmap ( xhci->regs );
err_ioremap:
free ( xhci );