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Tue, 28 Jan 2020 10:42:11 +0100 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id B038E100039; Tue, 28 Jan 2020 10:42:08 +0100 (CET) Received: from Webmail-eu.st.com (sfhdag3node2.st.com [10.75.127.8]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id A20F321D3C0; Tue, 28 Jan 2020 10:42:08 +0100 (CET) Received: from localhost (10.75.127.46) by SFHDAG3NODE2.st.com (10.75.127.8) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Tue, 28 Jan 2020 10:42:08 +0100 From: Amelie Delaunay To: Vinod Koul , Dan Williams , Maxime Coquelin , Alexandre Torgue Subject: [PATCH 2/4] dmaengine: stm32-dmamux: fix clock handling in probe sequence Date: Tue, 28 Jan 2020 10:41:56 +0100 Message-ID: <20200128094158.20361-3-amelie.delaunay@st.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200128094158.20361-1-amelie.delaunay@st.com> References: <20200128094158.20361-1-amelie.delaunay@st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.46] X-ClientProxiedBy: SFHDAG5NODE3.st.com (10.75.127.15) To SFHDAG3NODE2.st.com (10.75.127.8) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138, 18.0.572 definitions=2020-01-28_02:2020-01-24, 2020-01-28 signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200128_014220_945155_EA60A87E X-CRM114-Status: GOOD ( 16.72 ) 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: Amelie Delaunay , linux-kernel@vger.kernel.org, Pierre-Yves MORDRET , dmaengine@vger.kernel.org, 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 From: Etienne Carriere This change ensures the DMAMUX device is reset only once it is clocked and that clock is released in a safe state when probe operation fails. Signed-off-by: Etienne Carriere Signed-off-by: Amelie Delaunay --- drivers/dma/stm32-dmamux.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) diff --git a/drivers/dma/stm32-dmamux.c b/drivers/dma/stm32-dmamux.c index 08d2395c8943..a862d3339fb7 100644 --- a/drivers/dma/stm32-dmamux.c +++ b/drivers/dma/stm32-dmamux.c @@ -259,6 +259,12 @@ static int stm32_dmamux_probe(struct platform_device *pdev) return ret; } + ret = clk_prepare_enable(stm32_dmamux->clk); + if (ret < 0) { + dev_err(&pdev->dev, "clk_prep_enable error: %d\n", ret); + return ret; + } + stm32_dmamux->rst = devm_reset_control_get(&pdev->dev, NULL); if (!IS_ERR(stm32_dmamux->rst)) { reset_control_assert(stm32_dmamux->rst); @@ -274,14 +280,6 @@ static int stm32_dmamux_probe(struct platform_device *pdev) pm_runtime_set_active(&pdev->dev); pm_runtime_enable(&pdev->dev); - if (!IS_ERR(stm32_dmamux->clk)) { - ret = clk_prepare_enable(stm32_dmamux->clk); - if (ret < 0) { - dev_err(&pdev->dev, "clk_prep_enable error: %d\n", ret); - return ret; - } - } - pm_runtime_get_noresume(&pdev->dev); /* Reset the dmamux */ @@ -290,8 +288,12 @@ static int stm32_dmamux_probe(struct platform_device *pdev) pm_runtime_put(&pdev->dev); - return of_dma_router_register(node, stm32_dmamux_route_allocate, + ret = of_dma_router_register(node, stm32_dmamux_route_allocate, &stm32_dmamux->dmarouter); + if (ret) + clk_disable_unprepare(stm32_dmamux->clk); + + return ret; } #ifdef CONFIG_PM -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel