From patchwork Fri Nov 14 14:33:40 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ludovic Desroches X-Patchwork-Id: 5306771 Return-Path: X-Original-To: patchwork-linux-arm@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 13996C11AC for ; Fri, 14 Nov 2014 14:36:28 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id EEF97201B4 for ; Fri, 14 Nov 2014 14:36:26 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 185512015D for ; Fri, 14 Nov 2014 14:36:26 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1XpHxI-0006PC-22; Fri, 14 Nov 2014 14:34:32 +0000 Received: from eusmtp01.atmel.com ([212.144.249.242]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1XpHxE-0006MN-Ka for linux-arm-kernel@lists.infradead.org; Fri, 14 Nov 2014 14:34:29 +0000 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, 14 Nov 2014 15:33:59 +0100 From: Ludovic Desroches To: , Subject: [PATCH 2/2] mmc: atmel-mci: introduce probe deferring Date: Fri, 14 Nov 2014 15:33:40 +0100 Message-ID: <1415975620-30140-2-git-send-email-ludovic.desroches@atmel.com> X-Mailer: git-send-email 2.0.3 In-Reply-To: <1415975620-30140-1-git-send-email-ludovic.desroches@atmel.com> References: <1415975620-30140-1-git-send-email-ludovic.desroches@atmel.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20141114_063429_022160_3FA04AB7 X-CRM114-Status: GOOD ( 13.11 ) X-Spam-Score: -0.0 (/) Cc: =chris@printf.net, ulf.hansson@linaro.org, Ludovic Desroches , nicolas.ferre@atmel.com X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_LOW, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable 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. Using late_initcall is no more needing. Signed-off-by: Ludovic Desroches --- drivers/mmc/host/atmel-mci.c | 52 +++++++++++++++++++++++++------------------- 1 file changed, 30 insertions(+), 22 deletions(-) diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c index de2287c..caddbbd 100644 --- a/drivers/mmc/host/atmel-mci.c +++ b/drivers/mmc/host/atmel-mci.c @@ -2272,37 +2272,40 @@ 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) { struct mci_platform_data *pdata; dma_cap_mask_t mask; + int ret = 0; if (host == NULL) - return false; + return -EINVAL; pdata = host->pdev->dev.platform_data; dma_cap_zero(mask); dma_cap_set(DMA_SLAVE, mask); - 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)) { + ret = PTR_ERR(host->dma.chan); + if (ret != -EPROBE_DEFER) + dev_warn(&host->pdev->dev, "no DMA channel available\n"); + return ret; } + + 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; } /* @@ -2419,7 +2422,10 @@ static int __init 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; @@ -2506,6 +2512,7 @@ err_init_slot: del_timer_sync(&host->timer); if (host->dma.chan) dma_release_channel(host->dma.chan); +err_dma_probe_defer: free_irq(irq, host); return ret; } @@ -2573,6 +2580,7 @@ static const struct dev_pm_ops atmci_dev_pm_ops = { }; static struct platform_driver atmci_driver = { + .probe = atmci_probe, .remove = __exit_p(atmci_remove), .driver = { .name = "atmel_mci", @@ -2583,7 +2591,7 @@ static struct platform_driver atmci_driver = { static int __init atmci_init(void) { - return platform_driver_probe(&atmci_driver, atmci_probe); + return platform_driver_register(&atmci_driver); } static void __exit atmci_exit(void) @@ -2591,7 +2599,7 @@ static void __exit atmci_exit(void) platform_driver_unregister(&atmci_driver); } -late_initcall(atmci_init); /* try to load after dma driver when built-in */ +subsys_initcall(atmci_init); module_exit(atmci_exit); MODULE_DESCRIPTION("Atmel Multimedia Card Interface driver");