From mboxrd@z Thu Jan 1 00:00:00 1970 From: Troy Kisky Date: Fri, 20 Sep 2013 11:58:19 -0700 Subject: [U-Boot] [PATCH V4 10/17] usb: gadget: mv_udc: optimize bounce In-Reply-To: <201309201258.00209.marex@denx.de> References: <1379647780-2623-1-git-send-email-troy.kisky@boundarydevices.com> <1379647780-2623-11-git-send-email-troy.kisky@boundarydevices.com> <201309201258.00209.marex@denx.de> Message-ID: <523C9ACB.7050000@boundarydevices.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de 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 >> >> --- >> 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 buffer, if it worked before this patch, it should work after as well. > > Best regards, > Marek Vasut >