From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anton Bondarenko Subject: [PATCH v6 4/8] spi: imx: defer spi initialization, if DMA engine is Date: Tue, 8 Dec 2015 07:43:46 +0100 Message-ID: <1449557030-27525-5-git-send-email-anton.bondarenko.sama@gmail.com> References: <1449557030-27525-1-git-send-email-anton.bondarenko.sama@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: jiada_wang@mentor.com, vladimir_zapolskiy@mentor.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-spi@vger.kernel.org To: broonie@kernel.org, b38343@freescale.com, s.hauer@pengutronix.de Return-path: In-Reply-To: <1449557030-27525-1-git-send-email-anton.bondarenko.sama@gmail.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.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 c123060..d98c33c 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -1222,6 +1222,9 @@ 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