Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754826AbbEZNda (ORCPT ); Tue, 26 May 2015 09:33:30 -0400 Received: from arroyo.ext.ti.com ([192.94.94.40]:45226 "EHLO arroyo.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754459AbbEZN0s (ORCPT ); Tue, 26 May 2015 09:26:48 -0400 From: Peter Ujfalusi To: , CC: , , , , , , , , , , , Ulf Hansson Subject: [PATCH 07/13] mmc: davinci_mmc: Support for deferred probing when requesting DMA channels Date: Tue, 26 May 2015 16:26:02 +0300 Message-ID: <1432646768-12532-8-git-send-email-peter.ujfalusi@ti.com> X-Mailer: git-send-email 2.3.5 In-Reply-To: <1432646768-12532-1-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 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2367 Lines: 67 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 --- drivers/mmc/host/davinci_mmc.c | 26 +++++++++++++++----------- 1 file changed, 15 insertions(+), 11 deletions(-) diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c index b2b3f8bbfd8c..df81e4e2f662 100644 --- a/drivers/mmc/host/davinci_mmc.c +++ b/drivers/mmc/host/davinci_mmc.c @@ -530,20 +530,20 @@ static int __init davinci_acquire_dma_channels(struct mmc_davinci_host *host) dma_cap_zero(mask); dma_cap_set(DMA_SLAVE, mask); - host->dma_tx = - dma_request_slave_channel_compat(mask, edma_filter_fn, - &host->txdma, mmc_dev(host->mmc), "tx"); - if (!host->dma_tx) { + host->dma_tx = dma_request_slave_channel_compat_reason(mask, + edma_filter_fn, &host->txdma, + mmc_dev(host->mmc), "tx"); + if (IS_ERR(host->dma_tx)) { dev_err(mmc_dev(host->mmc), "Can't get dma_tx channel\n"); - return -ENODEV; + return PTR_ERR(host->dma_tx); } - host->dma_rx = - dma_request_slave_channel_compat(mask, edma_filter_fn, - &host->rxdma, mmc_dev(host->mmc), "rx"); - if (!host->dma_rx) { + host->dma_rx = dma_request_slave_channel_compat_reason(mask, + edma_filter_fn, &host->rxdma, + mmc_dev(host->mmc), "rx"); + if (IS_ERR(host->dma_rx)) { dev_err(mmc_dev(host->mmc), "Can't get dma_rx channel\n"); - r = -ENODEV; + r = PTR_ERR(host->dma_rx); goto free_master_write; } @@ -1307,8 +1307,12 @@ static int __init davinci_mmcsd_probe(struct platform_device *pdev) host->mmc_irq = irq; host->sdio_irq = platform_get_irq(pdev, 1); - if (host->use_dma && davinci_acquire_dma_channels(host) != 0) + if (host->use_dma) { + ret = davinci_acquire_dma_channels(host); + if (ret == -EPROBE_DEFER) + goto out; host->use_dma = 0; + } /* REVISIT: someday, support IRQ-driven card detection. */ mmc->caps |= MMC_CAP_NEEDS_POLL; -- 2.3.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/