From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Ujfalusi Subject: Re: [PATCH] dmaengine: omap-dma: Add support for memcpy Date: Tue, 8 Sep 2015 15:25:33 +0300 Message-ID: <55EED3BD.1080605@ti.com> References: <1429688069-31765-1-git-send-email-peter.ujfalusi@ti.com> <3187470.tKXzQaPa1m@avalon> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <3187470.tKXzQaPa1m@avalon> Sender: linux-kernel-owner@vger.kernel.org To: Laurent Pinchart Cc: vinod.koul@intel.com, linux@arm.linux.org.uk, tony@atomide.com, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, dan.j.williams@intel.com List-Id: linux-omap@vger.kernel.org Laurent, On 09/08/2015 02:24 PM, Laurent Pinchart wrote: > Hi Peter, >=20 > Thank you for the patch. >=20 > While trying to port the omap_vout driver to the DMA engine API I not= iced that=20 > the driver makes use of double-indexed transfers, which are not suppo= rted by=20 > the omap-dma driver. I haven't checked in details what would be requi= red, but=20 > the interleaved API might be a good candidate for this. Do you have a= ny plan=20 > to add support for double-indexed transfers to the omap-dma driver ? If double-indexed transfer support is needed by drivers still using the legacy/direct sDMA API, then I don't think we have other options.. So far I have not looked at that part and where it would fit. I'll try to find time to look at this. I hope not in the distant future= ;) > On Wednesday 22 April 2015 10:34:29 Peter Ujfalusi wrote: >> The sDMA controller is capable of performing memory copy operation. = It need >> to be configured to software triggered mode and without HW synchroni= zation. >> The sDMA can copy data which is aligned to 8, 16 or 32 bits. >> >> Signed-off-by: Peter Ujfalusi >> --- >> drivers/dma/omap-dma.c | 51 +++++++++++++++++++++++++++++++++++++++= ++++++-- >> 1 file changed, 49 insertions(+), 2 deletions(-) >=20 --=20 P=E9ter