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

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Message-ID: <20180821155553.GI2388@vkoul-mobl>
Date:   Tue, 21 Aug 2018 21:25:53 +0530
From:   Vinod <vkoul@...nel.org>
To:     Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
Cc:     dan.j.williams@...el.com, michal.simek@...inx.com,
        appana.durga.rao@...inx.com, lars@...afoo.de,
        dmaengine@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] dmaengine: xilinx_dma: Fix 64-bit simple CDMA
 transfer

On 27-07-18, 16:20, Radhey Shyam Pandey wrote:
> In AXI CDMA simple mode also pass MSB bits of source and destination
> address to xilinx_write function. This fixes simple CDMA operation
> mode using 64-bit addressing.
> 
> Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
> Signed-off-by: Michal Simek <michal.simek@...inx.com>
> ---
>  drivers/dma/xilinx/xilinx_dma.c |    6 ++++--
>  1 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c
> index a37871e..2e15d86 100644
> --- a/drivers/dma/xilinx/xilinx_dma.c
> +++ b/drivers/dma/xilinx/xilinx_dma.c
> @@ -1245,8 +1245,10 @@ static void xilinx_cdma_start_transfer(struct xilinx_dma_chan *chan)
>  
>  		hw = &segment->hw;
>  
> -		xilinx_write(chan, XILINX_CDMA_REG_SRCADDR, hw->src_addr);
> -		xilinx_write(chan, XILINX_CDMA_REG_DSTADDR, hw->dest_addr);
> +		xilinx_write(chan, XILINX_CDMA_REG_SRCADDR, (dma_addr_t)
> +			     ((u64)hw->src_addr_msb << 32 | hw->src_addr));

so this is:
        (dma_addr_t)((u64)hw->src_addr_msb << 32 | hw->src_addr)

what is src_addr data type? I think its u32. It would be better to
update xilinx_write() to take u64 and not dma_addr_t.


> +		xilinx_write(chan, XILINX_CDMA_REG_DSTADDR, (dma_addr_t)
> +			     ((u64)hw->dest_addr_msb << 32 | hw->dest_addr));
>  
>  		/* Start the transfer */
>  		dma_ctrl_write(chan, XILINX_DMA_REG_BTT,
> -- 
> 1.7.1
> 
> --
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-- 
~Vinod