From: Marek Vasut <marex@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH V4 10/17] usb: gadget: mv_udc: optimize bounce
Date: Mon, 23 Sep 2013 23:23:19 +0200 [thread overview]
Message-ID: <201309232323.19430.marex@denx.de> (raw)
In-Reply-To: <52409285.5030202@boundarydevices.com>
Dear Troy Kisky,
> On 9/22/2013 5:02 PM, Marek Vasut wrote:
> > Dear Troy Kisky,
> >
> >> On 9/20/2013 3:58 AM, Marek Vasut wrote:
> >>> Dear Troy Kisky,
> >>>
> >>>> Only perform one copy, either in the bounce
> >>>> routine for IN transfers, or the debounce
> >>>> rtn for OUT transfer.
> >>>>
> >>>> On out transfers, only copy the number
> >>>> of bytes received from the bounce buffer
> >>>>
> >>>> Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
> >>>>
> >>>> ---
> >>>> v4: no change
> >>>
> >>> Just a question here. Are you sure we never Send AND Reserve the data
> >>> in one turn? Because that would need two copyings.
> >>>
> >> ??? s/Reserve/Receive/
> >>
> >> As far as I'm aware, a single buffer is only ever used to capture or
> >> provide data not both.
> >> But, if 2 transfers were queued, an OUT and then an IN using the same
>
> Actually, I should have said "an IN (tx to the host controller) and then
> an OUT(rx from the host controller)"
>
> >> buffer, if it worked before
> >> this patch, it should work after as well.
> >
> > How come? Before, it was doing flush before and inval after the transfer,
> > right ?
>
> The 1st "IN" transfer (tx to the host), will [copy]/flush on mv_bounce
> and [free]/nothing on mv_debounce.
> The 2nd "OUT" transfer (rx from the host) will flush on mv_bounce and
> invalidate/[copy/free] on mv_debounce.
>
> > btw what does this part of the patch do/mean ? Why is it there?
> >
> > @@ -387,10 +383,9 @@ static void handle_ep_complete(struct mv_ep *ep)
> >
> > num, in ? "in" : "out", item->info, item->page0);
> >
> > len = (item->info >> 16) & 0x7fff;
> >
> > -
> > - mv_debounce(ep);
> > -
> >
> > ep->req.length -= len;
> >
> > + mv_debounce(ep, in);
> > +
>
> That implements the "On out transfers, only copy the number of bytes
> received from the bounce buffer"
> portion of the commit message.
OK, thanks.
Best regards,
Marek Vasut
next prev parent reply other threads:[~2013-09-23 21:23 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-20 3:29 [U-Boot] [PATCH V4 00/17] Make mv_udc work for i.mx6 Troy Kisky
2013-09-20 3:29 ` [U-Boot] [PATCH V4 01/17] usb: gadget: mv_udc: don't check CONFIG_USB_MAX_CONTROLLER_COUNT Troy Kisky
2013-09-20 10:45 ` Marek Vasut
2013-09-20 18:18 ` Troy Kisky
2013-09-23 0:05 ` Marek Vasut
2013-09-23 20:23 ` Troy Kisky
2013-09-23 20:55 ` Troy Kisky
2013-09-23 21:17 ` Marek Vasut
2013-09-20 3:29 ` [U-Boot] [PATCH V4 02/17] usb: ehci-mx6: add support for host mode otg port Troy Kisky
2013-09-20 10:51 ` Marek Vasut
2013-09-20 18:27 ` Troy Kisky
2013-09-20 3:29 ` [U-Boot] [PATCH V4 03/17] usb: gadget: ether set wMaxPacketSize Troy Kisky
2013-09-20 10:52 ` Marek Vasut
2013-09-20 18:34 ` Troy Kisky
2013-09-23 0:04 ` Marek Vasut
2013-09-23 19:51 ` Troy Kisky
2013-09-23 21:22 ` Marek Vasut
2013-09-20 3:29 ` [U-Boot] [PATCH V4 04/17] usb: gadget: ether: return error from rx_submit if no request Troy Kisky
2013-09-20 10:52 ` Marek Vasut
2013-09-20 3:29 ` [U-Boot] [PATCH V4 05/17] usb: gadget: mv_udc: split mv_udc.h file Troy Kisky
2013-09-20 3:29 ` [U-Boot] [PATCH V4 06/17] usb: udc: add udc.h include file Troy Kisky
2013-09-20 10:55 ` Marek Vasut
2013-09-20 18:46 ` Troy Kisky
2013-09-20 18:52 ` Marek Vasut
2013-09-20 19:37 ` Troy Kisky
2013-09-20 19:53 ` Marek Vasut
2013-09-20 21:15 ` Troy Kisky
2013-09-20 21:20 ` Marek Vasut
2013-09-20 21:33 ` Troy Kisky
2013-09-20 22:01 ` Marek Vasut
2013-09-21 0:25 ` Troy Kisky
2013-09-20 3:29 ` [U-Boot] [PATCH V4 07/17] usb: gadget: mv_udc: fix typo in error message Troy Kisky
2013-09-20 3:29 ` [U-Boot] [PATCH V4 08/17] usb: gadget: mv_udc: set is_dualspeed = 1 Troy Kisky
2013-09-20 3:29 ` [U-Boot] [PATCH V4 09/17] usb: gadget: mv_udc: fix full speed connections Troy Kisky
2013-09-20 3:29 ` [U-Boot] [PATCH V4 10/17] usb: gadget: mv_udc: optimize bounce Troy Kisky
2013-09-20 10:58 ` Marek Vasut
2013-09-20 18:58 ` Troy Kisky
2013-09-23 0:02 ` Marek Vasut
2013-09-23 19:12 ` Troy Kisky
2013-09-23 21:23 ` Marek Vasut [this message]
2013-09-20 3:29 ` [U-Boot] [PATCH V4 11/17] usb: gadget: mv_udc: flush item before head Troy Kisky
2013-09-20 3:29 ` [U-Boot] [PATCH V4 12/17] usb: gadget: mv_udc: optimize ep_enable Troy Kisky
2013-09-20 3:29 ` [U-Boot] [PATCH V4 13/17] usb: gadget: mv_udc: zero transfer descriptor memory on probe Troy Kisky
2013-09-20 3:29 ` [U-Boot] [PATCH V4 14/17] usb: gadget: mv_udc: clear desc upon ep_disable Troy Kisky
2013-09-20 3:29 ` [U-Boot] [PATCH V4 15/17] mx6: iomux: add GPR1 defines for use with nitrogen6x Troy Kisky
2013-09-20 3:29 ` [U-Boot] [PATCH V4 16/17] nitrogen6x: add otg usb host/device mode support Troy Kisky
2013-09-20 4:08 ` Troy Kisky
2013-09-20 3:29 ` [U-Boot] [PATCH V4 17/17] nitrogen6x: add CONFIG_MV_UDC Troy Kisky
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