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author | Andrey Smirnov <andrew.smirnov@gmail.com> | 2019-05-22 00:34:09 -0700 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2019-05-23 09:57:04 +0200 |
commit | 5f2110b07caa1ddbbadc68f1d34e2c60d8c94796 (patch) | |
tree | 035e747e916bd8a5cf97cd7132f788517e014c68 | |
parent | b221099d66a8d52e68c5ce074e082a8a0d1dbf3e (diff) | |
download | barebox-5f2110b07caa1ddbbadc68f1d34e2c60d8c94796.tar.gz barebox-5f2110b07caa1ddbbadc68f1d34e2c60d8c94796.tar.xz |
usb: host: ehci: Add a comment explaing IOC setting for data
Add a comment explaining the rationale behinde QT_TOKEN_IOC(req ==
NULL).
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
-rw-r--r-- | drivers/usb/host/ehci-hcd.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c index f0d899e82b..a6f497925e 100644 --- a/drivers/usb/host/ehci-hcd.c +++ b/drivers/usb/host/ehci-hcd.c @@ -362,6 +362,15 @@ ehci_submit_async(struct usb_device *dev, unsigned long pipe, void *buffer, ret = ehci_prepare_qtd(ehci->dev, td, QT_TOKEN_DT(toggle) | + /* + * We only want this qTD to + * generate an interrupt if + * this is a BULK + * request. Otherwise, we'll + * rely on following status + * stage qTD's IOC to notify us + * that transfer is complete + */ QT_TOKEN_IOC(req == NULL) | QT_TOKEN_PID(pid), buffer, length, |