diff options
Diffstat (limited to 'drivers/usb/gadget/s3c-hsotg.c')
| -rw-r--r-- | drivers/usb/gadget/s3c-hsotg.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c index 4a251458c61d..354fd456f8cc 100644 --- a/drivers/usb/gadget/s3c-hsotg.c +++ b/drivers/usb/gadget/s3c-hsotg.c @@ -91,7 +91,9 @@ struct s3c_hsotg_req; * For periodic IN endpoints, we have fifo_size and fifo_load to try * and keep track of the amount of data in the periodic FIFO for each * of these as we don't have a status register that tells us how much - * is in each of them. + * is in each of them. (note, this may actually be useless information + * as in shared-fifo mode periodic in acts like a single-frame packet + * buffer than a fifo) */ struct s3c_hsotg_ep { struct usb_ep ep; @@ -474,6 +476,14 @@ static int s3c_hsotg_write_fifo(struct s3c_hsotg *hsotg, size_left = S3C_DxEPTSIZ_XferSize_GET(epsize); + /* if shared fifo, we cannot write anything until the + * previous data has been completely sent. + */ + if (hs_ep->fifo_load != 0) { + s3c_hsotg_en_gsint(hsotg, S3C_GINTSTS_PTxFEmp); + return -ENOSPC; + } + dev_dbg(hsotg->dev, "%s: left=%d, load=%d, fifo=%d, size %d\n", __func__, size_left, hs_ep->size_loaded, hs_ep->fifo_load, hs_ep->fifo_size); |