linux-kernel - Re: [PATCH 06/25] dmaengine: dw-edma: Fix missing src/dst address of the interleaved xfers

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Date:   Thu, 24 Mar 2022 21:56:18 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Vinod Koul <vkoul@...nel.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Frank Li <Frank.Li@....com>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        linux-pci@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/25] dmaengine: dw-edma: Fix missing src/dst address of
 the interleaved xfers

On Thu, Mar 24, 2022 at 04:48:17AM +0300, Serge Semin wrote:
> The interleaved DMA transfers support was added in the commit 85e7518f42c8
> ("dmaengine: dw-edma: Add device_prep_interleave_dma() support"). It
> seems like the support was broken from the very beginning. Depending on
> the selected channel either source or destination address are left
> uninitialized which was obviously wrong. I don't really know how come the
> original modification was working for the commit author. Anyway let's fix
> it by initializing the destination address of the eDMA burst descriptors
> for the DEV_TO_MEM interleaved operations and by initializing the source
> address of the eDMA burst descriptors for the MEM_TO_DEV interleaved
> operations.
> 
> Fixes: 85e7518f42c8 ("dmaengine: dw-edma: Add device_prep_interleave_dma() support")
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

Thanks,
Mani

> ---
>  drivers/dma/dw-edma/dw-edma-core.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c
> index 519d4b3c9fa0..2010d7f8191f 100644
> --- a/drivers/dma/dw-edma/dw-edma-core.c
> +++ b/drivers/dma/dw-edma/dw-edma-core.c
> @@ -456,6 +456,8 @@ dw_edma_device_transfer(struct dw_edma_transfer *xfer)
>  				 * and destination addresses are increased
>  				 * by the same portion (data length)
>  				 */
> +			} else if (xfer->type == EDMA_XFER_INTERLEAVED) {
> +				burst->dar = dst_addr;
>  			}
>  		} else {
>  			burst->dar = dst_addr;
> @@ -471,6 +473,8 @@ dw_edma_device_transfer(struct dw_edma_transfer *xfer)
>  				 * and destination addresses are increased
>  				 * by the same portion (data length)
>  				 */
> +			}  else if (xfer->type == EDMA_XFER_INTERLEAVED) {
> +				burst->sar = src_addr;
>  			}
>  		}
>  
> -- 
> 2.35.1
>