linux-kernel - Re: [PATCH] dma: imx-dma: configure the generic DMA type to make it work

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Message-ID: <YQeY0E5oRHXkT+TO@matsya>
Date:   Mon, 2 Aug 2021 12:33:44 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Juergen Borleis <jbe@...gutronix.de>
Cc:     dmaengine@...r.kernel.org, linux-imx@....com, festevam@...il.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        shawnguo@...nel.org, kernel@...gutronix.de
Subject: Re: [PATCH] dma: imx-dma: configure the generic DMA type to make it
 work

On 29-07-21, 09:18, Juergen Borleis wrote:
> Commit dea7a9f

you should use 12+ chars for sha1 
>   dmaengine: imx-dma: remove dma_slave_config direction usage

even with this is commit log, you made the patch tile dma: ....!
> 
> changes the method from a "configuration when called" to an "configuration
> when used". Due to this, only the cyclic DMA type gets configured
> correctly, while the generic DMA type is left non-configured.
> 
> Without this additional call, the struct imxdma_channel::word_size member
> is stuck at DMA_SLAVE_BUSWIDTH_UNDEFINED and imxdma_prep_slave_sg() always
> returns NULL.

I ahve fixed the subsystem name, updated commit in 12 chars and format
expected, added it as Fixes line and applied.

Please take care of these things!

> 
> Signed-off-by: Juergen Borleis <jbe@...gutronix.de>
> ---
>  drivers/dma/imx-dma.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c
> index 7f116bb..2ddc31e 100644
> --- a/drivers/dma/imx-dma.c
> +++ b/drivers/dma/imx-dma.c
> @@ -812,6 +812,8 @@ static struct dma_async_tx_descriptor *imxdma_prep_slave_sg(
>  		dma_length += sg_dma_len(sg);
>  	}
>  
> +	imxdma_config_write(chan, &imxdmac->config, direction);
> +
>  	switch (imxdmac->word_size) {
>  	case DMA_SLAVE_BUSWIDTH_4_BYTES:
>  		if (sg_dma_len(sgl) & 3 || sgl->dma_address & 3)
> -- 
> 2.20.1

-- 
~Vinod