linux-kernel - RE: [PATCH 3/3] dmaengine: xilinx_dma: Fix 64-bit simple CDMA transfer

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Date:   Tue, 11 Sep 2018 09:31:07 +0000
From:   Radhey Shyam Pandey <radheys@...inx.com>
To:     Vinod <vkoul@...nel.org>
CC:     "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        Michal Simek <michals@...inx.com>,
        Appana Durga Kedareswara Rao <appanad@...inx.com>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 3/3] dmaengine: xilinx_dma: Fix 64-bit simple CDMA
 transfer

> > > > Yeah that part was clear but the implementation can be better..
> > I thought over it and it seems having a new interface dma_ctrl_write_64
> > taking lsb and msb bits input looks better and scalable. It will be similar
> > to existing vdma_desc_write_64 impl. I will send v2 if it looks ok.
> 
> Yes that is much better, btw why not reuse same routine as common xilinx
> lib functions :)

Thanks.  vdma_desc_write_64 uses a different offset i.e desc_offset.
For reusing it we need to have an additional check to derive offset
(ctrl_offset/desc_offset) based on channel config type. Considering
it, i think a separate helper interface _64 for desc/control offset
simplifies the flow. Please let me know your thoughts on it.

-Radhey
> 
> --
> ~Vinod