lkml.org 
[lkml]   [2009]   [Jul]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[patch 14/71] USB: EHCI: use the new clear_tt_buffer interface
2.6.30-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Alan Stern <stern@rowland.harvard.edu>

commit 914b701280a76f96890ad63eb0fa99bf204b961c upstream.

This patch (as1256) changes ehci-hcd and all the other drivers in the
EHCI family to make use of the new clear_tt_buffer callbacks. When a
Clear-TT-Buffer request is in progress for a QH, the QH is not allowed
to be linked into the async schedule until the request is finished.
At that time, if there are any URBs queued for the QH, it is linked
into the async schedule.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/usb/host/ehci-au1xxx.c | 2
drivers/usb/host/ehci-fsl.c | 2
drivers/usb/host/ehci-hcd.c | 2
drivers/usb/host/ehci-ixp4xx.c | 2
drivers/usb/host/ehci-orion.c | 2
drivers/usb/host/ehci-pci.c | 2
drivers/usb/host/ehci-ppc-of.c | 2
drivers/usb/host/ehci-ps3.c | 2
drivers/usb/host/ehci-q.c | 91 ++++++++++++++++++++++++++++++-----------
drivers/usb/host/ehci.h | 2
10 files changed, 86 insertions(+), 23 deletions(-)
--- a/drivers/usb/host/ehci-au1xxx.c
+++ b/drivers/usb/host/ehci-au1xxx.c
@@ -112,6 +112,8 @@ static const struct hc_driver ehci_au1xx
.bus_resume = ehci_bus_resume,
.relinquish_port = ehci_relinquish_port,
.port_handed_over = ehci_port_handed_over,
+
+ .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};

static int ehci_hcd_au1xxx_drv_probe(struct platform_device *pdev)
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -324,6 +324,8 @@ static const struct hc_driver ehci_fsl_h
.bus_resume = ehci_bus_resume,
.relinquish_port = ehci_relinquish_port,
.port_handed_over = ehci_port_handed_over,
+
+ .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};

static int ehci_fsl_drv_probe(struct platform_device *pdev)
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -353,7 +353,9 @@ struct ehci_qh {
unsigned short period; /* polling interval */
unsigned short start; /* where polling starts */
#define NO_FRAME ((unsigned short)~0) /* pick new start */
+
struct usb_device *dev; /* access to TT */
+ unsigned clearing_tt:1; /* Clear-TT-Buf in progress */
} __attribute__ ((aligned (32)));

/*-------------------------------------------------------------------------*/
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -1003,6 +1003,8 @@ idle_timeout:
schedule_timeout_uninterruptible(1);
goto rescan;
case QH_STATE_IDLE: /* fully unlinked */
+ if (qh->clearing_tt)
+ goto idle_timeout;
if (list_empty (&qh->qtd_list)) {
qh_put (qh);
break;
--- a/drivers/usb/host/ehci-ixp4xx.c
+++ b/drivers/usb/host/ehci-ixp4xx.c
@@ -60,6 +60,8 @@ static const struct hc_driver ixp4xx_ehc
#endif
.relinquish_port = ehci_relinquish_port,
.port_handed_over = ehci_port_handed_over,
+
+ .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};

static int ixp4xx_ehci_probe(struct platform_device *pdev)
--- a/drivers/usb/host/ehci-orion.c
+++ b/drivers/usb/host/ehci-orion.c
@@ -164,6 +164,8 @@ static const struct hc_driver ehci_orion
.bus_resume = ehci_bus_resume,
.relinquish_port = ehci_relinquish_port,
.port_handed_over = ehci_port_handed_over,
+
+ .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};

static void __init
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -408,6 +408,8 @@ static const struct hc_driver ehci_pci_h
.bus_resume = ehci_bus_resume,
.relinquish_port = ehci_relinquish_port,
.port_handed_over = ehci_port_handed_over,
+
+ .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};

/*-------------------------------------------------------------------------*/
--- a/drivers/usb/host/ehci-ppc-of.c
+++ b/drivers/usb/host/ehci-ppc-of.c
@@ -78,6 +78,8 @@ static const struct hc_driver ehci_ppc_o
#endif
.relinquish_port = ehci_relinquish_port,
.port_handed_over = ehci_port_handed_over,
+
+ .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};


--- a/drivers/usb/host/ehci-ps3.c
+++ b/drivers/usb/host/ehci-ps3.c
@@ -74,6 +74,8 @@ static const struct hc_driver ps3_ehci_h
#endif
.relinquish_port = ehci_relinquish_port,
.port_handed_over = ehci_port_handed_over,
+
+ .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};

static int ps3_ehci_probe(struct ps3_system_bus_device *dev)
--- a/drivers/usb/host/ehci-q.c
+++ b/drivers/usb/host/ehci-q.c
@@ -139,6 +139,55 @@ qh_refresh (struct ehci_hcd *ehci, struc

/*-------------------------------------------------------------------------*/

+static void qh_link_async(struct ehci_hcd *ehci, struct ehci_qh *qh);
+
+static void ehci_clear_tt_buffer_complete(struct usb_hcd *hcd,
+ struct usb_host_endpoint *ep)
+{
+ struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+ struct ehci_qh *qh = ep->hcpriv;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ehci->lock, flags);
+ qh->clearing_tt = 0;
+ if (qh->qh_state == QH_STATE_IDLE && !list_empty(&qh->qtd_list)
+ && HC_IS_RUNNING(hcd->state))
+ qh_link_async(ehci, qh);
+ spin_unlock_irqrestore(&ehci->lock, flags);
+}
+
+static void ehci_clear_tt_buffer(struct ehci_hcd *ehci, struct ehci_qh *qh,
+ struct urb *urb, u32 token)
+{
+
+ /* If an async split transaction gets an error or is unlinked,
+ * the TT buffer may be left in an indeterminate state. We
+ * have to clear the TT buffer.
+ *
+ * Note: this routine is never called for Isochronous transfers.
+ */
+ if (urb->dev->tt && !usb_pipeint(urb->pipe) && !qh->clearing_tt) {
+#ifdef DEBUG
+ struct usb_device *tt = urb->dev->tt->hub;
+ dev_dbg(&tt->dev,
+ "clear tt buffer port %d, a%d ep%d t%08x\n",
+ urb->dev->ttport, urb->dev->devnum,
+ usb_pipeendpoint(urb->pipe), token);
+#endif /* DEBUG */
+ if (!ehci_is_TDI(ehci)
+ || urb->dev->tt->hub !=
+ ehci_to_hcd(ehci)->self.root_hub) {
+ if (usb_hub_clear_tt_buffer(urb) == 0)
+ qh->clearing_tt = 1;
+ } else {
+
+ /* REVISIT ARC-derived cores don't clear the root
+ * hub TT buffer in this way...
+ */
+ }
+ }
+}
+
static int qtd_copy_status (
struct ehci_hcd *ehci,
struct urb *urb,
@@ -195,28 +244,6 @@ static int qtd_copy_status (
usb_pipeendpoint (urb->pipe),
usb_pipein (urb->pipe) ? "in" : "out",
token, status);
-
- /* if async CSPLIT failed, try cleaning out the TT buffer */
- if (status != -EPIPE
- && urb->dev->tt
- && !usb_pipeint(urb->pipe)
- && ((token & QTD_STS_MMF) != 0
- || QTD_CERR(token) == 0)
- && (!ehci_is_TDI(ehci)
- || urb->dev->tt->hub !=
- ehci_to_hcd(ehci)->self.root_hub)) {
-#ifdef DEBUG
- struct usb_device *tt = urb->dev->tt->hub;
- dev_dbg (&tt->dev,
- "clear tt buffer port %d, a%d ep%d t%08x\n",
- urb->dev->ttport, urb->dev->devnum,
- usb_pipeendpoint (urb->pipe), token);
-#endif /* DEBUG */
- /* REVISIT ARC-derived cores don't clear the root
- * hub TT buffer in this way...
- */
- usb_hub_clear_tt_buffer(urb);
- }
}

return status;
@@ -407,9 +434,16 @@ qh_completions (struct ehci_hcd *ehci, s
/* qh unlinked; token in overlay may be most current */
if (state == QH_STATE_IDLE
&& cpu_to_hc32(ehci, qtd->qtd_dma)
- == qh->hw_current)
+ == qh->hw_current) {
token = hc32_to_cpu(ehci, qh->hw_token);

+ /* An unlink may leave an incomplete
+ * async transaction in the TT buffer.
+ * We have to clear it.
+ */
+ ehci_clear_tt_buffer(ehci, qh, urb, token);
+ }
+
/* force halt for unlinked or blocked qh, so we'll
* patch the qh later and so that completions can't
* activate it while we "know" it's stopped.
@@ -435,6 +469,13 @@ halt:
&& (qtd->hw_alt_next
& EHCI_LIST_END(ehci)))
last_status = -EINPROGRESS;
+
+ /* As part of low/full-speed endpoint-halt processing
+ * we must clear the TT buffer (11.17.5).
+ */
+ if (unlikely(last_status != -EINPROGRESS &&
+ last_status != -EREMOTEIO))
+ ehci_clear_tt_buffer(ehci, qh, urb, token);
}

/* if we're removing something not at the queue head,
@@ -864,6 +905,10 @@ static void qh_link_async (struct ehci_h
__hc32 dma = QH_NEXT(ehci, qh->qh_dma);
struct ehci_qh *head;

+ /* Don't link a QH if there's a Clear-TT-Buffer pending */
+ if (unlikely(qh->clearing_tt))
+ return;
+
/* (re)start the async schedule? */
head = ehci->async;
timer_action_done (ehci, TIMER_ASYNC_OFF);



\
 
 \ /
  Last update: 2009-07-29 01:53    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site