linux-kernel - Re: [PATCH -next 7/8] dmaengine: xilinx_dma: Check for both idle and halted state in axidma stop

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Date:   Thu, 26 Sep 2019 10:21:07 -0700
From:   Vinod Koul <vkoul@...nel.org>
To:     Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
Cc:     dan.j.williams@...el.com, michal.simek@...inx.com,
        nick.graumann@...il.com, andrea.merello@...il.com,
        appana.durga.rao@...inx.com, mcgrof@...nel.org,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next 7/8] dmaengine: xilinx_dma: Check for both idle and
 halted state in axidma stop_transfer

On 05-09-19, 22:07, Radhey Shyam Pandey wrote:
> From: Nicholas Graumann <nick.graumann@...il.com>
> 
> When polling for a stopped transfer in AXI DMA mode, in some cases the
> status of the channel may indicate IDLE instead of HALTED if the
> channel was reset due to an error.
> 
> Signed-off-by: Nicholas Graumann <nick.graumann@...il.com>
> Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
> ---
>  drivers/dma/xilinx/xilinx_dma.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c
> index b5dd62a..0896e07 100644
> --- a/drivers/dma/xilinx/xilinx_dma.c
> +++ b/drivers/dma/xilinx/xilinx_dma.c
> @@ -1092,8 +1092,9 @@ static int xilinx_dma_stop_transfer(struct xilinx_dma_chan *chan)
>  
>  	/* Wait for the hardware to halt */
>  	return xilinx_dma_poll_timeout(chan, XILINX_DMA_REG_DMASR, val,
> -				       val & XILINX_DMA_DMASR_HALTED, 0,
> -				       XILINX_DMA_LOOP_COUNT);
> +				       val | (XILINX_DMA_DMASR_IDLE |
> +					      XILINX_DMA_DMASR_HALTED),

The condition was bitwise AND and now is OR.. ??

> +				       0, XILINX_DMA_LOOP_COUNT);
>  }
>  
>  /**
> -- 
> 2.7.4

-- 
~Vinod