linux-kernel - Re: [PATCH] fpga: versal: Add support for 44-bit DMA operations

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Message-ID: <ZSd/nI/HWEYxcm5a@yilunxu-OptiPlex-7050>
Date:   Thu, 12 Oct 2023 13:09:48 +0800
From:   Xu Yilun <yilun.xu@...ux.intel.com>
To:     "Manne, Nava kishore" <nava.kishore.manne@....com>
Cc:     "mdf@...nel.org" <mdf@...nel.org>,
        "hao.wu@...el.com" <hao.wu@...el.com>,
        "yilun.xu@...el.com" <yilun.xu@...el.com>,
        "trix@...hat.com" <trix@...hat.com>,
        "linux-fpga@...r.kernel.org" <linux-fpga@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Pandey, Radhey Shyam" <radhey.shyam.pandey@....com>
Subject: Re: [PATCH] fpga: versal: Add support for 44-bit DMA operations

On Tue, Oct 10, 2023 at 05:37:43AM +0000, Manne, Nava kishore wrote:
> Hi Yilun,
> 
> 	Thanks for providing the review comments.
> Please find my response inline.
> 
> > -----Original Message-----
> > From: Xu Yilun <yilun.xu@...ux.intel.com>
> > Sent: Saturday, October 7, 2023 12:47 PM
> > To: Manne, Nava kishore <nava.kishore.manne@....com>
> > Cc: mdf@...nel.org; hao.wu@...el.com; yilun.xu@...el.com;
> > trix@...hat.com; linux-fpga@...r.kernel.org; linux-kernel@...r.kernel.org;
> > Pandey, Radhey Shyam <radhey.shyam.pandey@....com>
> > Subject: Re: [PATCH] fpga: versal: Add support for 44-bit DMA operations
> > 
> > On Tue, Oct 03, 2023 at 12:44:09PM +0530, Nava kishore Manne wrote:
> > > The existing implementation support only 32-bit DMA operation.
> > > So, it fails to load the bitstream for the high DDR designs(Beyond 4GB).
> > > To fix this issue update the DMA mask handling logic to support 44-bit
> > 
> > This is the HW defined DMA addressing capability. Does the device only
> > support up to 44 bits DMA? Any Doc?
> > 
> The versal platform supports a maximum physical address size is 44-bit in AArch64.
> For more details, please refer the Versal TRM (Memory space- section):
>  https://docs.xilinx.com/r/en-US/am011-versal-acap-trm/Memory-Space

Acked-by: Xu Yilun <yilun.xu@...el.com>

Applied.

> 
> Regards,
> Navakishore.
>