linux-kernel - Re: [PATCH] i2c: i2c-stm32f7: report dma error during probe

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Date:   Fri, 25 Oct 2019 16:12:24 +0200
From:   Pierre Yves MORDRET <pierre-yves.mordret@...com>
To:     Alain Volmat <alain.volmat@...com>, <wsa@...-dreams.de>
CC:     <alexandre.torgue@...com>, <linux-i2c@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <fabrice.gasnier@...com>
Subject: Re: [PATCH] i2c: i2c-stm32f7: report dma error during probe

Hi

Looks good for me

Reviewed-by: Pierre-Yves MORDRET <pierre-yves.mordret@...com>

Regards

On 10/24/19 2:52 PM, Alain Volmat wrote:
> Distinguish between the case where dma information is not provided
> within the DT and the case of an error during the dma init.
> Exit the probe with error in case of an error during dma init.
> 
> Fixes: bb8822cbbc53 ("i2c: i2c-stm32: Add generic DMA API")
> 
> Signed-off-by: Alain Volmat <alain.volmat@...com>
> ---
>  drivers/i2c/busses/i2c-stm32.c   | 16 ++++++++--------
>  drivers/i2c/busses/i2c-stm32f7.c |  9 +++++++++
>  2 files changed, 17 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-stm32.c b/drivers/i2c/busses/i2c-stm32.c
> index 07d5dfce68d4..1da347e6a358 100644
> --- a/drivers/i2c/busses/i2c-stm32.c
> +++ b/drivers/i2c/busses/i2c-stm32.c
> @@ -20,13 +20,13 @@ struct stm32_i2c_dma *stm32_i2c_dma_request(struct device *dev,
>  
>  	dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL);
>  	if (!dma)
> -		return NULL;
> +		return ERR_PTR(-ENOMEM);
>  
>  	/* Request and configure I2C TX dma channel */
> -	dma->chan_tx = dma_request_slave_channel(dev, "tx");
> -	if (!dma->chan_tx) {
> +	dma->chan_tx = dma_request_chan(dev, "tx");
> +	if (IS_ERR(dma->chan_tx)) {
>  		dev_dbg(dev, "can't request DMA tx channel\n");
> -		ret = -EINVAL;
> +		ret = PTR_ERR(dma->chan_tx);
>  		goto fail_al;
>  	}
>  
> @@ -42,10 +42,10 @@ struct stm32_i2c_dma *stm32_i2c_dma_request(struct device *dev,
>  	}
>  
>  	/* Request and configure I2C RX dma channel */
> -	dma->chan_rx = dma_request_slave_channel(dev, "rx");
> -	if (!dma->chan_rx) {
> +	dma->chan_rx = dma_request_chan(dev, "rx");
> +	if (IS_ERR(dma->chan_rx)) {
>  		dev_err(dev, "can't request DMA rx channel\n");
> -		ret = -EINVAL;
> +		ret = PTR_ERR(dma->chan_rx);
>  		goto fail_tx;
>  	}
>  
> @@ -75,7 +75,7 @@ struct stm32_i2c_dma *stm32_i2c_dma_request(struct device *dev,
>  	devm_kfree(dev, dma);
>  	dev_info(dev, "can't use DMA\n");
>  
> -	return NULL;
> +	return ERR_PTR(ret);
>  }
>  
>  void stm32_i2c_dma_free(struct stm32_i2c_dma *dma)
> diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-stm32f7.c
> index d36cf08461f7..cc8ba8f49ae6 100644
> --- a/drivers/i2c/busses/i2c-stm32f7.c
> +++ b/drivers/i2c/busses/i2c-stm32f7.c
> @@ -1950,6 +1950,15 @@ static int stm32f7_i2c_probe(struct platform_device *pdev)
>  	i2c_dev->dma = stm32_i2c_dma_request(i2c_dev->dev, phy_addr,
>  					     STM32F7_I2C_TXDR,
>  					     STM32F7_I2C_RXDR);
> +	if (PTR_ERR(i2c_dev->dma) == -ENODEV)
> +		i2c_dev->dma = NULL;
> +	else if (IS_ERR(i2c_dev->dma)) {
> +		ret = PTR_ERR(i2c_dev->dma);
> +		if (ret != -EPROBE_DEFER)
> +			dev_err(&pdev->dev,
> +				"Failed to request dma error %i\n", ret);
> +		goto clk_free;
> +	}
>  
>  	platform_set_drvdata(pdev, i2c_dev);
>  
>