linux-kernel - [PATCH 1/2] media: imx-mipi-csis: Fix clock handling in remove()

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Date:   Wed, 22 Nov 2023 15:13:48 +0200
From:   Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To:     Kieran Bingham <kieran.bingham@...asonboard.com>,
        Rui Miguel Silva <rmfrfs@...il.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Martin Kepplinger <martink@...teo.de>,
        Purism Kernel Team <kernel@...i.sm>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>
Cc:     linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Subject: [PATCH 1/2] media: imx-mipi-csis: Fix clock handling in remove()

The driver always calls mipi_csis_runtime_suspend() and
mipi_csis_clk_disable() in remove(). This causes multiple WARNs from the
kernel, as the clocks get disabled too many times.

Fix the remove() to call mipi_csis_runtime_suspend() and
mipi_csis_clk_disable() in a way that reverses what is done in probe().

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
---
 drivers/media/platform/nxp/imx-mipi-csis.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/nxp/imx-mipi-csis.c b/drivers/media/platform/nxp/imx-mipi-csis.c
index 6cb20b45e0a1..b39d7aeba750 100644
--- a/drivers/media/platform/nxp/imx-mipi-csis.c
+++ b/drivers/media/platform/nxp/imx-mipi-csis.c
@@ -1502,8 +1502,10 @@ static void mipi_csis_remove(struct platform_device *pdev)
 	v4l2_async_nf_cleanup(&csis->notifier);
 	v4l2_async_unregister_subdev(&csis->sd);
 
+	if (!pm_runtime_enabled(&pdev->dev))
+		mipi_csis_runtime_suspend(&pdev->dev);
+
 	pm_runtime_disable(&pdev->dev);
-	mipi_csis_runtime_suspend(&pdev->dev);
 	mipi_csis_clk_disable(csis);
 	v4l2_subdev_cleanup(&csis->sd);
 	media_entity_cleanup(&csis->sd.entity);

-- 
2.34.1