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| author | Ben Dooks <ben-linux@fluff.org> | 2010-07-19 09:40:45 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-10 14:35:42 -0700 |
| commit | 03e10e5ab5ba6511ddaf80085cf08c62e9336fa5 (patch) | |
| tree | ef2bce4b63f9ba1811b8ef89bc8b08d85b01e838 /drivers/usb/gadget/s3c-hsotg.c | |
| parent | 10aebc772a10c95e30dff0779cb0f879b8f1554f (diff) | |
| download | linux-03e10e5ab5ba6511ddaf80085cf08c62e9336fa5.tar.gz linux-03e10e5ab5ba6511ddaf80085cf08c62e9336fa5.tar.bz2 linux-03e10e5ab5ba6511ddaf80085cf08c62e9336fa5.zip | |
USB: s3c-hsotg: Only load packet per fifo write
Limit the IN FIFO write to a single packet per attempt at writing,
as per the specifications and ensure that we don't return fifo-full
so that we can continue writing packets if we have the space.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/gadget/s3c-hsotg.c')
| -rw-r--r-- | drivers/usb/gadget/s3c-hsotg.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c index 4196e376a346..df6a39d6270f 100644 --- a/drivers/usb/gadget/s3c-hsotg.c +++ b/drivers/usb/gadget/s3c-hsotg.c @@ -538,6 +538,17 @@ static int s3c_hsotg_write_fifo(struct s3c_hsotg *hsotg, if (can_write > 512) can_write = 512; + /* limit the write to one max-packet size worth of data, but allow + * the transfer to return that it did not run out of fifo space + * doing it. */ + if (to_write > hs_ep->ep.maxpacket) { + to_write = hs_ep->ep.maxpacket; + + s3c_hsotg_en_gsint(hsotg, + periodic ? S3C_GINTSTS_PTxFEmp : + S3C_GINTSTS_NPTxFEmp); + } + /* see if we can write data */ if (to_write > can_write) { |