From patchwork Thu Nov 20 10:07:55 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ludovic Desroches X-Patchwork-Id: 5347081 Return-Path: X-Original-To: patchwork-linux-mmc@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 35F309F387 for ; Thu, 20 Nov 2014 10:08:47 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 5C6F120176 for ; Thu, 20 Nov 2014 10:08:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5896C201F5 for ; Thu, 20 Nov 2014 10:08:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757140AbaKTKIo (ORCPT ); Thu, 20 Nov 2014 05:08:44 -0500 Received: from eusmtp01.atmel.com ([212.144.249.242]:45093 "EHLO eusmtp01.atmel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756731AbaKTKIn (ORCPT ); Thu, 20 Nov 2014 05:08:43 -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; Thu, 20 Nov 2014 11:08:36 +0100 From: Ludovic Desroches To: , CC: , , , Ludovic Desroches Subject: [PATCH 3/3] mmc: atmel-mci: use probe deferring if dma controller is not ready yet Date: Thu, 20 Nov 2014 11:07:55 +0100 Message-ID: <1416478075-17059-3-git-send-email-ludovic.desroches@atmel.com> X-Mailer: git-send-email 2.0.3 In-Reply-To: <1416478075-17059-1-git-send-email-ludovic.desroches@atmel.com> References: <1416478075-17059-1-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 | 46 ++++++++++++++++++++++++-------------------- 1 file changed, 25 insertions(+), 21 deletions(-) diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c index 9b85c4e..29bfd5e 100644 --- a/drivers/mmc/host/atmel-mci.c +++ b/drivers/mmc/host/atmel-mci.c @@ -2265,29 +2265,29 @@ 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)) { + ret = PTR_ERR(host->dma.chan); + host->dma.chan = NULL; + 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; } /* @@ -2403,7 +2403,10 @@ 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; @@ -2476,6 +2479,7 @@ 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; }