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| author | Matthew Wilcox <matthew@wil.cx> | 2010-12-15 14:18:11 -0500 |
|---|---|---|
| committer | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2011-01-14 15:52:00 -0800 |
| commit | 50d64676d132a8a72a1a1657d7b3e6efa53da1ac (patch) | |
| tree | b2c5b85f15e4068d29fd41d2e6e65f81dd7339d5 /drivers/usb/host/xhci-ring.c | |
| parent | 7961acd7327fe48e55abef277630abdbb3f2081a (diff) | |
| download | kernel_samsung_smdk4412-50d64676d132a8a72a1a1657d7b3e6efa53da1ac.zip kernel_samsung_smdk4412-50d64676d132a8a72a1a1657d7b3e6efa53da1ac.tar.gz kernel_samsung_smdk4412-50d64676d132a8a72a1a1657d7b3e6efa53da1ac.tar.bz2 | |
xhci: Remove more doorbell-related reads
The unused space in the doorbell is now marked as RsvdZ, not RsvdP, so
we can avoid reading the doorbell before writing it.
Update the doorbell-related defines to produce the entire doorbell value
from a single macro. Document the doorbell format in a comment.
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Diffstat (limited to 'drivers/usb/host/xhci-ring.c')
| -rw-r--r-- | drivers/usb/host/xhci-ring.c | 27 |
1 files changed, 11 insertions, 16 deletions
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 2116c0f..3e8211c 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -308,11 +308,8 @@ static int room_on_ring(struct xhci_hcd *xhci, struct xhci_ring *ring, /* Ring the host controller doorbell after placing a command on the ring */ void xhci_ring_cmd_db(struct xhci_hcd *xhci) { - u32 temp; - xhci_dbg(xhci, "// Ding dong!\n"); - temp = xhci_readl(xhci, &xhci->dba->doorbell[0]) & DB_MASK; - xhci_writel(xhci, temp | DB_TARGET_HOST, &xhci->dba->doorbell[0]); + xhci_writel(xhci, DB_VALUE_HOST, &xhci->dba->doorbell[0]); /* Flush PCI posted writes */ xhci_readl(xhci, &xhci->dba->doorbell[0]); } @@ -322,26 +319,24 @@ void xhci_ring_ep_doorbell(struct xhci_hcd *xhci, unsigned int ep_index, unsigned int stream_id) { - struct xhci_virt_ep *ep; - unsigned int ep_state; - u32 field; __u32 __iomem *db_addr = &xhci->dba->doorbell[slot_id]; + struct xhci_virt_ep *ep = &xhci->devs[slot_id]->eps[ep_index]; + unsigned int ep_state = ep->ep_state; - ep = &xhci->devs[slot_id]->eps[ep_index]; - ep_state = ep->ep_state; /* Don't ring the doorbell for this endpoint if there are pending - * cancellations because the we don't want to interrupt processing. + * cancellations because we don't want to interrupt processing. * We don't want to restart any stream rings if there's a set dequeue * pointer command pending because the device can choose to start any * stream once the endpoint is on the HW schedule. * FIXME - check all the stream rings for pending cancellations. */ - if (!(ep_state & EP_HALT_PENDING) && !(ep_state & SET_DEQ_PENDING) - && !(ep_state & EP_HALTED)) { - field = xhci_readl(xhci, db_addr) & DB_MASK; - field |= EPI_TO_DB(ep_index) | STREAM_ID_TO_DB(stream_id); - xhci_writel(xhci, field, db_addr); - } + if ((ep_state & EP_HALT_PENDING) || (ep_state & SET_DEQ_PENDING) || + (ep_state & EP_HALTED)) + return; + xhci_writel(xhci, DB_VALUE(ep_index, stream_id), db_addr); + /* The CPU has better things to do at this point than wait for a + * write-posting flush. It'll get there soon enough. + */ } /* Ring the doorbell for any rings with pending URBs */ |