From patchwork Thu Dec 12 13:55:49 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Ujfalusi X-Patchwork-Id: 11288321 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9553913B6 for ; Thu, 12 Dec 2019 13:56:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 72F7B22527 for ; Thu, 12 Dec 2019 13:56:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ti.com header.i=@ti.com header.b="Nz6TLqNe" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729619AbfLLN42 (ORCPT ); Thu, 12 Dec 2019 08:56:28 -0500 Received: from fllv0016.ext.ti.com ([198.47.19.142]:36308 "EHLO fllv0016.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729642AbfLLN41 (ORCPT ); Thu, 12 Dec 2019 08:56:27 -0500 Received: from lelv0265.itg.ti.com ([10.180.67.224]) by fllv0016.ext.ti.com (8.15.2/8.15.2) with ESMTP id xBCDuGqo009067; Thu, 12 Dec 2019 07:56:16 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1576158976; bh=GufpDqc/JsjNnk5yJpyjIjNCslz2RxoV+SAcmiZ8xk8=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=Nz6TLqNez/VlFzVcmNAVmLTW+ivYsv/Hnj3n02im4EkIY3qdHIbhPWbNfp77t4onc nvjel4ZQAzU15S50IvRb0YyiWzLLU12uNlbRzATwx3XJR7NYh16KY/DMfS63M05i82 TeM1akRUu76tlP4PvOR/ARz4t4F3VF8Znw5rA+Ys= Received: from DLEE105.ent.ti.com (dlee105.ent.ti.com [157.170.170.35]) by lelv0265.itg.ti.com (8.15.2/8.15.2) with ESMTPS id xBCDuFKS019946 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 12 Dec 2019 07:56:16 -0600 Received: from DLEE100.ent.ti.com (157.170.170.30) by DLEE105.ent.ti.com (157.170.170.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1847.3; Thu, 12 Dec 2019 07:56:15 -0600 Received: from lelv0326.itg.ti.com (10.180.67.84) by DLEE100.ent.ti.com (157.170.170.30) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1847.3 via Frontend Transport; Thu, 12 Dec 2019 07:56:15 -0600 Received: from feketebors.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by lelv0326.itg.ti.com (8.15.2/8.15.2) with ESMTP id xBCDtdqY048444; Thu, 12 Dec 2019 07:56:11 -0600 From: Peter Ujfalusi To: , , , , , , , , , CC: , , , , , Subject: [PATCH 8/9] spi: stm32-qspi: Use dma_request_chan() instead dma_request_slave_channel() Date: Thu, 12 Dec 2019 15:55:49 +0200 Message-ID: <20191212135550.4634-9-peter.ujfalusi@ti.com> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191212135550.4634-1-peter.ujfalusi@ti.com> References: <20191212135550.4634-1-peter.ujfalusi@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org dma_request_slave_channel() is a wrapper on top of dma_request_chan() eating up the error code. By using dma_request_chan() directly the driver can support deferred probing against DMA. Signed-off-by: Peter Ujfalusi --- drivers/spi/spi-stm32-qspi.c | 30 ++++++++++++++++++++++++------ 1 file changed, 24 insertions(+), 6 deletions(-) diff --git a/drivers/spi/spi-stm32-qspi.c b/drivers/spi/spi-stm32-qspi.c index 4e726929bb4f..4ef569b47aa6 100644 --- a/drivers/spi/spi-stm32-qspi.c +++ b/drivers/spi/spi-stm32-qspi.c @@ -470,10 +470,11 @@ static int stm32_qspi_setup(struct spi_device *spi) return 0; } -static void stm32_qspi_dma_setup(struct stm32_qspi *qspi) +static int stm32_qspi_dma_setup(struct stm32_qspi *qspi) { struct dma_slave_config dma_cfg; struct device *dev = qspi->dev; + int ret = 0; memset(&dma_cfg, 0, sizeof(dma_cfg)); @@ -484,8 +485,13 @@ static void stm32_qspi_dma_setup(struct stm32_qspi *qspi) dma_cfg.src_maxburst = 4; dma_cfg.dst_maxburst = 4; - qspi->dma_chrx = dma_request_slave_channel(dev, "rx"); - if (qspi->dma_chrx) { + qspi->dma_chrx = dma_request_chan(dev, "rx"); + if (IS_ERR(qspi->dma_chrx)) { + ret = PTR_ERR(qspi->dma_chrx); + qspi->dma_chrx = NULL; + if (ret == -EPROBE_DEFER) + goto out; + } else { if (dmaengine_slave_config(qspi->dma_chrx, &dma_cfg)) { dev_err(dev, "dma rx config failed\n"); dma_release_channel(qspi->dma_chrx); @@ -493,8 +499,11 @@ static void stm32_qspi_dma_setup(struct stm32_qspi *qspi) } } - qspi->dma_chtx = dma_request_slave_channel(dev, "tx"); - if (qspi->dma_chtx) { + qspi->dma_chtx = dma_request_chan(dev, "tx"); + if (IS_ERR(qspi->dma_chtx)) { + ret = PTR_ERR(qspi->dma_chtx); + qspi->dma_chtx = NULL; + } else { if (dmaengine_slave_config(qspi->dma_chtx, &dma_cfg)) { dev_err(dev, "dma tx config failed\n"); dma_release_channel(qspi->dma_chtx); @@ -502,7 +511,13 @@ static void stm32_qspi_dma_setup(struct stm32_qspi *qspi) } } +out: init_completion(&qspi->dma_completion); + + if (ret != -EPROBE_DEFER) + ret = 0; + + return ret; } static void stm32_qspi_dma_free(struct stm32_qspi *qspi) @@ -608,7 +623,10 @@ static int stm32_qspi_probe(struct platform_device *pdev) qspi->dev = dev; platform_set_drvdata(pdev, qspi); - stm32_qspi_dma_setup(qspi); + ret = stm32_qspi_dma_setup(qspi); + if (ret) + goto err; + mutex_init(&qspi->lock); ctrl->mode_bits = SPI_RX_DUAL | SPI_RX_QUAD