From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anton Bondarenko Subject: [PATCH v5 07/11] spi: imx: defer spi initialization, if DMA engine is Date: Sat, 5 Dec 2015 17:57:05 +0100 Message-ID: <1449334629-4715-8-git-send-email-anton.bondarenko.sama@gmail.com> References: <1449334629-4715-1-git-send-email-anton.bondarenko.sama@gmail.com> Cc: linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, vladimir_zapolskiy@mentor.com, jiada_wang@mentor.com To: broonie@kernel.org, b38343@freescale.com, s.hauer@pengutronix.de Return-path: In-Reply-To: <1449334629-4715-1-git-send-email-anton.bondarenko.sama@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-spi.vger.kernel.org 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: Anton Bondarenko --- drivers/spi/spi-imx.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index 277dd75..fa24637 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -1221,6 +1221,9 @@ static int spi_imx_probe(struct platform_device *pdev) */ if (is_imx51_ecspi(spi_imx)) { ret = spi_imx_sdma_init(&pdev->dev, spi_imx, master, res); + if (ret == -EPROBE_DEFER) + goto out_clk_put; + if (ret < 0) dev_err(&pdev->dev, "dma setup error %d, use pio\n", ret); -- 2.6.3