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authorSarah Sharp <sarah.a.sharp@linux.intel.com>2009-08-07 17:04:49 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2009-09-23 09:46:17 -0400
commit2d3f1fac7ee8bb4c6fad40f838488edbeabb0c50 (patch)
treeb1887263a969025bb53f801ca18d0c0a5cf9f34e /drivers/usb/host/xhci.h
parent47aded8ade9fee6779b121b2b156235f261239d7 (diff)
USB: xhci: Support full speed devices.
Full speed devices have varying max packet sizes (8, 16, 32, or 64) for endpoint 0. The xHCI hardware needs to know the real max packet size that the USB core discovers after it fetches the first 8 bytes of the device descriptor. In order to fix this without adding a new hook to host controller drivers, the xHCI driver looks for an updated max packet size for control endpoints. If it finds an updated size, it issues an evaluate context command and waits for that command to finish. This should only happen in the initialization and device descriptor fetching steps in the khubd thread, so blocking should be fine. Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host/xhci.h')
-rw-r--r--drivers/usb/host/xhci.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index a8fe21762052..6aecede77ff6 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -601,6 +601,8 @@ struct xhci_ep_ctx {
601/* bit 7 is Host Initiate Disable - for disabling stream selection */ 601/* bit 7 is Host Initiate Disable - for disabling stream selection */
602#define MAX_BURST(p) (((p)&0xff) << 8) 602#define MAX_BURST(p) (((p)&0xff) << 8)
603#define MAX_PACKET(p) (((p)&0xffff) << 16) 603#define MAX_PACKET(p) (((p)&0xffff) << 16)
604#define MAX_PACKET_MASK (0xffff << 16)
605#define MAX_PACKET_DECODED(p) (((p) >> 16) & 0xffff)
604 606
605 607
606/** 608/**