linux-kernel - Re: Applied "spi: davinci: enable DMA when channels are defined in DT" to the spi tree

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Message-ID: <11df78f1-7b4e-5093-f166-b3af21c03abc@baylibre.com>
Date:   Wed, 8 Mar 2017 11:35:02 +0100
From:   Frode Isaksen <fisaksen@...libre.com>
To:     Mark Brown <broonie@...nel.org>,
        Fabien Parent <fparent@...libre.com>
Cc:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        nsekhar@...com, ptitiano@...libre.com, khilman@...libre.com
Subject: Re: Applied "spi: davinci: enable DMA when channels are defined in
 DT" to the spi tree

Hello Mark,

To avoid data corruption issues with UBIFS volume over SPI NOR, DMA should not be used for vmalloc'ed buffers. The 5'th patch in my series fixes that:

0003-spi-davinci-use-rx-buffer-as-dummy-tx-buffer.patch
0004-spi-davinci-do-not-use-DMA-if-transfer-length-is-les.patch
0005-spi-davinci-do-not-use-DMA-for-vmalloc-ed-buffers.patch

Thanks,

Frode



On 07/03/2017 15:22, Mark Brown wrote:
> The patch
>
>    spi: davinci: enable DMA when channels are defined in DT
>
> has been applied to the spi tree at
>
>    git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 
>
> All being well this means that it will be integrated into the linux-next
> tree (usually sometime in the next 24 hours) and sent to Linus during
> the next merge window (or sooner if it is a bug fix), however if
> problems are discovered then the patch may be dropped or reverted.  
>
> You may get further e-mails resulting from automated or manual testing
> and review of the tree, please engage with people reporting problems and
> send followup patches addressing any issues that are reported if needed.
>
> If any updates are required or you are submitting further changes they
> should be sent as incremental updates against current git, existing
> patches will not be replaced.
>
> Please add any relevant lists and maintainers to the CCs when replying
> to this mail.
>
> Thanks,
> Mark
>
> From 3e2e1258443ea97e40dfb4a3cf15108d17939066 Mon Sep 17 00:00:00 2001
> From: Fabien Parent <fparent@...libre.com>
> Date: Thu, 23 Feb 2017 19:01:57 +0100
> Subject: [PATCH] spi: davinci: enable DMA when channels are defined in DT
>
> When booting with DT the SPI driver is always using
> the SPI_IO_TYPE_INTR mode to transfer data even if DMA channels are
> defined in the DT.
>
> This commit changes the behaviour to select the SPI_IO_TYPE_DMA mode
> if DMA channels are defined in the DT and will keep SPI_IO_TYPE_INTR
> if the channels are not defined in it.
>
> Signed-off-by: Fabien Parent <fparent@...libre.com>
> Signed-off-by: Frode Isaksen <fisaksen@...libre.com>
> Signed-off-by: Mark Brown <broonie@...nel.org>
> ---
>  drivers/spi/spi-davinci.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/spi/spi-davinci.c b/drivers/spi/spi-davinci.c
> index 164cc719be54..1e24395a04f2 100644
> --- a/drivers/spi/spi-davinci.c
> +++ b/drivers/spi/spi-davinci.c
> @@ -389,6 +389,7 @@ static int davinci_spi_of_setup(struct spi_device *spi)
>  {
>  	struct davinci_spi_config *spicfg = spi->controller_data;
>  	struct device_node *np = spi->dev.of_node;
> +	struct davinci_spi *dspi = spi_master_get_devdata(spi->master);
>  	u32 prop;
>  
>  	if (spicfg == NULL && np) {
> @@ -400,6 +401,9 @@ static int davinci_spi_of_setup(struct spi_device *spi)
>  		if (!of_property_read_u32(np, "ti,spi-wdelay", &prop))
>  			spicfg->wdelay = (u8)prop;
>  		spi->controller_data = spicfg;
> +
> +		if (dspi->dma_rx && dspi->dma_tx)
> +			spicfg->io_type = SPI_IO_TYPE_DMA;
>  	}
>  
>  	return 0;