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Tue, 26 May 2020 17:51:14 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 263EA10002A; Tue, 26 May 2020 17:51:14 +0200 (CEST) Received: from Webmail-eu.st.com (sfhdag6node1.st.com [10.75.127.16]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 0DA712C4B37; Tue, 26 May 2020 17:51:14 +0200 (CEST) Received: from localhost (10.75.127.49) by SFHDAG6NODE1.st.com (10.75.127.16) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 26 May 2020 17:51:13 +0200 From: Ludovic Barre To: Ulf Hansson , Rob Herring Subject: [PATCH 2/2] mmc: mmci_sdmmc: fix DMA API warning max segment size Date: Tue, 26 May 2020 17:51:03 +0200 Message-ID: <20200526155103.12514-3-ludovic.barre@st.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200526155103.12514-1-ludovic.barre@st.com> References: <20200526155103.12514-1-ludovic.barre@st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.49] X-ClientProxiedBy: SFHDAG8NODE3.st.com (10.75.127.24) To SFHDAG6NODE1.st.com (10.75.127.16) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216, 18.0.687 definitions=2020-05-26_02:2020-05-26, 2020-05-26 signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200526_085121_305045_3A8ECD39 X-CRM114-Status: GOOD ( 15.50 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, Alexandre Torgue , linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, srinivas.kandagatla@linaro.org, Ludovic Barre , Maxime Coquelin , linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Turning on CONFIG_DMA_API_DEBUG_SG results in the following warning: WARNING: CPU: 1 PID: 85 at kernel/dma/debug.c:1302 debug_dma_map_sg+0x2a0/0x3cc mmci-pl18x 58005000.sdmmc: DMA-API: mapping sg segment longer than device claims to support [len=126976] [max=65536] dma api debug checks and compares the segment size to dma_get_max_seg_size (dev->dma_parms->max_segment_size), the sdmmc variant has an internal DMA and should define its max_segment_size constraint to avoid this warning. This Patch defines the dev->dma_parms->max_segment_size with the constraint already set for mmc core (host->mmc->max_seg_size). Signed-off-by: Ludovic Barre --- drivers/mmc/host/mmci_stm32_sdmmc.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/drivers/mmc/host/mmci_stm32_sdmmc.c b/drivers/mmc/host/mmci_stm32_sdmmc.c index 2965b1c062e1..51db30acf4dc 100644 --- a/drivers/mmc/host/mmci_stm32_sdmmc.c +++ b/drivers/mmc/host/mmci_stm32_sdmmc.c @@ -119,20 +119,19 @@ static void sdmmc_idma_unprep_data(struct mmci_host *host, static int sdmmc_idma_setup(struct mmci_host *host) { struct sdmmc_idma *idma; + struct device *dev = mmc_dev(host->mmc); - idma = devm_kzalloc(mmc_dev(host->mmc), sizeof(*idma), GFP_KERNEL); + idma = devm_kzalloc(dev, sizeof(*idma), GFP_KERNEL); if (!idma) return -ENOMEM; host->dma_priv = idma; if (host->variant->dma_lli) { - idma->sg_cpu = dmam_alloc_coherent(mmc_dev(host->mmc), - SDMMC_LLI_BUF_LEN, + idma->sg_cpu = dmam_alloc_coherent(dev, SDMMC_LLI_BUF_LEN, &idma->sg_dma, GFP_KERNEL); if (!idma->sg_cpu) { - dev_err(mmc_dev(host->mmc), - "Failed to alloc IDMA descriptor\n"); + dev_err(dev, "Failed to alloc IDMA descriptor\n"); return -ENOMEM; } host->mmc->max_segs = SDMMC_LLI_BUF_LEN / @@ -143,7 +142,7 @@ static int sdmmc_idma_setup(struct mmci_host *host) host->mmc->max_seg_size = host->mmc->max_req_size; } - return 0; + return dma_set_max_seg_size(dev, host->mmc->max_seg_size); } static int sdmmc_idma_start(struct mmci_host *host, unsigned int *datactrl) -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel