linux-kernel - Re: [PATCH v5 2/3] dmaeninge: xilinx_dma: Fix bug in multiple frame stores scenario in vdma

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Date:   Mon, 9 Jan 2017 23:35:40 -0600
From:   Rob Herring <robh@...nel.org>
To:     Kedareswara rao Appana <appana.durga.rao@...inx.com>
Cc:     mark.rutland@....com, dan.j.williams@...el.com,
        vinod.koul@...el.com, michal.simek@...inx.com,
        soren.brinkmann@...inx.com, appanad@...inx.com,
        moritz.fischer@...us.com, laurent.pinchart@...asonboard.com,
        luis@...ethencourt.com, Jose.Abreu@...opsys.com,
        dmaengine@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v5 2/3] dmaeninge: xilinx_dma: Fix bug in multiple frame
 stores scenario in vdma

On Sat, Jan 07, 2017 at 12:15:29PM +0530, Kedareswara rao Appana wrote:
> When VDMA is configured for more than one frame in the h/w
> for example h/w is configured for n number of frames and user
> Submits n number of frames and triggered the DMA using issue_pending API.
> In the current driver flow we are submitting one frame at a time
> but we should submit all the n number of frames at one time as the h/w
> Is configured for n number of frames.
> 
> This patch fixes this issue.
> 
> Reviewed-by: Jose Abreu <joabreu@...opsys.com>
> Signed-off-by: Kedareswara rao Appana <appanad@...inx.com>
> ---
> Changes for v5:
> ---> Updated xlnx,fstore-config property to xlnx,fstore-enable
>      and updated description as suggested by Rob.
> Changes for v4:
> ---> Add Check for framestore configuration on Transmit case as well
>      as suggested by Jose Abreu.
> ---> Modified the dev_dbg checks to dev_warn checks as suggested
>      by Jose Abreu.
> Changes for v3:
> ---> Added Checks for frame store configuration. If frame store
>      Configuration is not present at the h/w level and user
>      Submits less frames added debug prints in the driver as relevant.
> Changes for v2:
> ---> Fixed race conditions in the driver as suggested by Jose Abreu
> ---> Fixed unnecessray if else checks in the vdma_start_transfer
>      as suggested by Laurent Pinchart.
> 
>  .../devicetree/bindings/dma/xilinx/xilinx_dma.txt  |  2 +

Acked-by: Rob Herring <robh@...nel.org>

>  drivers/dma/xilinx/xilinx_dma.c                    | 78 +++++++++++++++-------
>  2 files changed, 57 insertions(+), 23 deletions(-)