Subject: [PATCH v4] spi: spi-imx: add DMA support

From: [email-masked] (Marek Vasut)
Date: Mon, 25 Aug 2014 10:07:22 +0200

On Saturday, August 23, 2014 at 02:13:55 AM, Robin Gong wrote:
> After enable DMA

Please also add a commit message which describes the change, not only some test 
results.

[...]

> @@ -911,6 +1194,13 @@ static int spi_imx_probe(struct platform_device
> *pdev) goto out_put_per;
> 
>  	spi_imx->spi_clk = clk_get_rate(spi_imx->clk_per);
> +	/*
> +	 * Only validated on i.mx6 now, can remove the constrain if validated on
> +	 * other chips.
> +	 */

Given that the check below tests for imx51_ecspi_devtype_data ... does that 
mean, that this code was never tested on MX51 and MX53, yet will be enabled
for those chips and might possibly break them ?

> +	if (spi_imx->devtype_data == &imx51_ecspi_devtype_data
> +	    && spi_imx_sdma_init(&pdev->dev, spi_imx, master, res))
> +		dev_err(&pdev->dev, "dma setup error,use pio instead\n");
> 
>  	spi_imx->devtype_data->reset(spi_imx);
> 
> @@ -949,6 +1239,7 @@ static int spi_imx_remove(struct platform_device
> *pdev) writel(0, spi_imx->base + MXC_CSPICTRL);
>  	clk_unprepare(spi_imx->clk_ipg);
>  	clk_unprepare(spi_imx->clk_per);
> +	spi_imx_sdma_exit(spi_imx);
>  	spi_master_put(master);
> 
>  	return 0;

Best regards,
Marek Vasut