From: Peter Ujfalusi Subject: [PATCH 06/13] mmc: omap: Support for deferred probing when requesting DMA channels Date: Tue, 26 May 2015 16:26:01 +0300 Message-ID: <1432646768-12532-7-git-send-email-peter.ujfalusi@ti.com> References: <1432646768-12532-1-git-send-email-peter.ujfalusi@ti.com> Mime-Version: 1.0 Content-Type: text/plain Cc: , , , , , , , , , , , Ulf Hansson , Jarkko Nikula To: , Return-path: Received: from comal.ext.ti.com ([198.47.26.152]:37621 "EHLO comal.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754486AbbEZN0x (ORCPT ); Tue, 26 May 2015 09:26:53 -0400 In-Reply-To: <1432646768-12532-1-git-send-email-peter.ujfalusi@ti.com> Sender: linux-crypto-owner@vger.kernel.org List-ID: Switch to use ma_request_slave_channel_compat_reason() to request the DMA channels. Only fall back to pio mode if the error code returned is not -EPROBE_DEFER, otherwise return from the probe with the -EPROBE_DEFER. Signed-off-by: Peter Ujfalusi CC: Ulf Hansson CC: Jarkko Nikula --- drivers/mmc/host/omap.c | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-) diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c index 68dd6c79c378..29238d0fbc24 100644 --- a/drivers/mmc/host/omap.c +++ b/drivers/mmc/host/omap.c @@ -1390,20 +1390,32 @@ static int mmc_omap_probe(struct platform_device *pdev) res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx"); if (res) sig = res->start; - host->dma_tx = dma_request_slave_channel_compat(mask, + host->dma_tx = dma_request_slave_channel_compat_reason(mask, omap_dma_filter_fn, &sig, &pdev->dev, "tx"); - if (!host->dma_tx) + if (IS_ERR(host->dma_tx)) { + ret = PTR_ERR(host->dma_tx); + if (ret == -EPROBE_DEFER) + goto err_free_dma; + + host->dma_tx = NULL; dev_warn(host->dev, "unable to obtain TX DMA engine channel %u\n", sig); + } res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx"); if (res) sig = res->start; - host->dma_rx = dma_request_slave_channel_compat(mask, + host->dma_rx = dma_request_slave_channel_compat_reason(mask, omap_dma_filter_fn, &sig, &pdev->dev, "rx"); - if (!host->dma_rx) + if (IS_ERR(host->dma_rx)) { + ret = PTR_ERR(host->dma_rx); + if (ret == -EPROBE_DEFER) + goto err_free_dma; + + host->dma_rx = NULL; dev_warn(host->dev, "unable to obtain RX DMA engine channel %u\n", sig); + } ret = request_irq(host->irq, mmc_omap_irq, 0, DRIVER_NAME, host); if (ret) -- 2.3.5