From patchwork Fri Nov 28 14:08:06 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ludovic Desroches X-Patchwork-Id: 5403991 Return-Path: X-Original-To: patchwork-linux-mmc@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id B37A0BEEBA for ; Fri, 28 Nov 2014 14:09:06 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id B54B420138 for ; Fri, 28 Nov 2014 14:09:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BCD5520121 for ; Fri, 28 Nov 2014 14:09:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751957AbaK1OI7 (ORCPT ); Fri, 28 Nov 2014 09:08:59 -0500 Received: from eusmtp01.atmel.com ([212.144.249.242]:48357 "EHLO eusmtp01.atmel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750976AbaK1OI6 (ORCPT ); Fri, 28 Nov 2014 09:08:58 -0500 Received: from ibiza.corp.atmel.com (10.161.101.13) by eusmtp01.atmel.com (10.161.101.30) with Microsoft SMTP Server id 14.2.347.0; Fri, 28 Nov 2014 15:08:49 +0100 From: Ludovic Desroches To: , CC: , , , Ludovic Desroches Subject: [PATCH v3 4/4] mmc: atmel-mci: use probe deferring if dma controller is not ready yet Date: Fri, 28 Nov 2014 15:08:06 +0100 Message-ID: <1417183686-31481-5-git-send-email-ludovic.desroches@atmel.com> X-Mailer: git-send-email 2.0.3 In-Reply-To: <1417183686-31481-1-git-send-email-ludovic.desroches@atmel.com> References: <1417183686-31481-1-git-send-email-ludovic.desroches@atmel.com> MIME-Version: 1.0 Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Return probe defer if requesting a dma channel without a dma controller probed. Signed-off-by: Ludovic Desroches --- drivers/mmc/host/atmel-mci.c | 49 ++++++++++++++++++++++---------------------- 1 file changed, 25 insertions(+), 24 deletions(-) diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c index 00f6088..0a96819 100644 --- a/drivers/mmc/host/atmel-mci.c +++ b/drivers/mmc/host/atmel-mci.c @@ -2272,29 +2272,26 @@ static void atmci_cleanup_slot(struct atmel_mci_slot *slot, mmc_free_host(slot->mmc); } -static bool atmci_configure_dma(struct atmel_mci *host) +static int atmci_configure_dma(struct atmel_mci *host) { - if (host == NULL) - return false; + int ret = 0; - host->dma.chan = dma_request_slave_channel(&host->pdev->dev, "rxtx"); - if (!host->dma.chan) { - dev_warn(&host->pdev->dev, "no DMA channel available\n"); - return false; - } else { - dev_info(&host->pdev->dev, - "using %s for DMA transfers\n", - dma_chan_name(host->dma.chan)); - - host->dma_conf.src_addr = host->mapbase + ATMCI_RDR; - host->dma_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; - host->dma_conf.src_maxburst = 1; - host->dma_conf.dst_addr = host->mapbase + ATMCI_TDR; - host->dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; - host->dma_conf.dst_maxburst = 1; - host->dma_conf.device_fc = false; - return true; - } + host->dma.chan = dma_request_slave_channel_reason(&host->pdev->dev, "rxtx"); + if (IS_ERR(host->dma.chan)) + return PTR_ERR(host->dma.chan); + + dev_info(&host->pdev->dev, "using %s for DMA transfers\n", + dma_chan_name(host->dma.chan)); + + host->dma_conf.src_addr = host->mapbase + ATMCI_RDR; + host->dma_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + host->dma_conf.src_maxburst = 1; + host->dma_conf.dst_addr = host->mapbase + ATMCI_TDR; + host->dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + host->dma_conf.dst_maxburst = 1; + host->dma_conf.device_fc = false; + + return ret; } /* @@ -2411,7 +2408,10 @@ static int atmci_probe(struct platform_device *pdev) /* Get MCI capabilities and set operations according to it */ atmci_get_cap(host); - if (atmci_configure_dma(host)) { + ret = atmci_configure_dma(host); + if (ret == -EPROBE_DEFER) + goto err_dma_probe_defer; + if (ret == 0) { host->prepare_data = &atmci_prepare_data_dma; host->submit_data = &atmci_submit_data_dma; host->stop_transfer = &atmci_stop_transfer_dma; @@ -2496,8 +2496,9 @@ err_init_slot: pm_runtime_put_noidle(&pdev->dev); del_timer_sync(&host->timer); - if (host->dma.chan) + if (!IS_ERR(host->dma.chan)) dma_release_channel(host->dma.chan); +err_dma_probe_defer: free_irq(irq, host); return ret; } @@ -2523,7 +2524,7 @@ static int atmci_remove(struct platform_device *pdev) atmci_readl(host, ATMCI_SR); del_timer_sync(&host->timer); - if (host->dma.chan) + if (!IS_ERR(host->dma.chan)) dma_release_channel(host->dma.chan); free_irq(platform_get_irq(pdev, 0), host);