From: Sascha Hauer <s.hauer@pengutronix.de>
To: Anton Bondarenko <anton.bondarenko.sama@gmail.com>
Cc: broonie@kernel.org, b38343@freescale.com,
linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
vladimir_zapolskiy@mentor.com, jiada_wang@mentor.com
Subject: Re: [PATCH v3 7/7] spi: imx: defer spi initialization, if DMA engine is pending
Date: Thu, 5 Nov 2015 09:59:26 +0100 [thread overview]
Message-ID: <20151105085926.GK8526@pengutronix.de> (raw)
In-Reply-To: <1446388901-6073-8-git-send-email-anton.bondarenko.sama@gmail.com>
On Sun, Nov 01, 2015 at 03:41:41PM +0100, Anton Bondarenko wrote:
> From: Anton Bondarenko <anton_bondarenko@mentor.com>
>
> If SPI device supports DMA mode, but DMA controller is not yet
> available due to e.g. a delay in the corresponding kernel module
> initialization, retry to initialize SPI driver later on instead of
> falling back into PIO only mode.
>
> Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
> Signed-off-by: Anton Bondarenko <anton_bondarenko@mentor.com>
Ok, so 6/7 is only part of the deferral story. Maybe squash the two
patches into one?
Sascha
> ---
> drivers/spi/spi-imx.c | 12 +++++++++---
> 1 file changed, 9 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
> index 6035ddd..d2ea731 100644
> --- a/drivers/spi/spi-imx.c
> +++ b/drivers/spi/spi-imx.c
> @@ -1354,9 +1354,15 @@ static int spi_imx_probe(struct platform_device *pdev)
> * Only validated on i.mx6 now, can remove the constrain if validated on
> * other chips.
> */
> - if (is_imx51_ecspi(spi_imx) &&
> - spi_imx_sdma_init(&pdev->dev, spi_imx, master))
> - dev_err(&pdev->dev, "dma setup error,use pio instead\n");
> + if (is_imx51_ecspi(spi_imx)) {
> + ret = spi_imx_sdma_init(&pdev->dev, spi_imx, master);
> + if (ret == -EPROBE_DEFER)
> + goto out_clk_put;
> +
> + if (ret < 0)
> + dev_err(&pdev->dev, "dma setup error %d, use pio\n",
> + ret);
> + }
>
> spi_imx->devtype_data->reset(spi_imx);
>
> --
> 2.6.2
>
>
--
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next prev parent reply other threads:[~2015-11-05 8:59 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-01 14:41 [PATCH v3 0/7] Improvements for SPI IMX driver for Freescale IMX51, IMX53 and IMX6 Anton Bondarenko
2015-11-01 14:41 ` [PATCH v3 1/7] spi: imx: Fix DMA transfer Anton Bondarenko
2015-11-03 7:08 ` Robin Gong
2015-11-04 21:03 ` Anton Bondarenko
2015-11-05 8:34 ` Sascha Hauer
2015-11-05 16:51 ` Anton Bondarenko
2015-11-14 10:02 ` Anton Bondarenko
2015-11-01 14:41 ` [PATCH v3 2/7] spi: imx: replace fixed timeout with calculated one Anton Bondarenko
2015-11-05 8:47 ` Sascha Hauer
2015-11-10 20:20 ` Anton Bondarenko
2015-11-11 8:12 ` Sascha Hauer
2015-11-14 10:01 ` Anton Bondarenko
2015-11-01 14:41 ` [PATCH v3 3/7] spi: imx: add support for all SPI word width for DMA transfer Anton Bondarenko
2015-11-14 10:08 ` Anton Bondarenko
2015-11-01 14:41 ` [PATCH v3 4/7] spi: imx: add function to check for IMX51 family controller Anton Bondarenko
2015-11-14 10:06 ` Anton Bondarenko
2015-11-01 14:41 ` [PATCH v3 5/7] spi: imx: Add support for loopback for ECSPI controllers Anton Bondarenko
2015-11-14 10:06 ` Anton Bondarenko
2015-11-01 14:41 ` [PATCH v3 6/7] spi: imx: return error from dma channel request Anton Bondarenko
2015-11-05 8:56 ` Sascha Hauer
2015-11-05 16:00 ` Anton Bondarenko
2015-11-14 10:03 ` Anton Bondarenko
2015-11-14 10:05 ` Anton Bondarenko
2015-11-01 14:41 ` [PATCH v3 7/7] spi: imx: defer spi initialization, if DMA engine is pending Anton Bondarenko
2015-11-05 8:59 ` Sascha Hauer [this message]
2015-11-05 16:18 ` Anton Bondarenko
2015-11-14 10:03 ` Anton Bondarenko
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