linux-kernel - [PATCH] media: marvell-ccic: Add support for runtime PM

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Message-Id: <20200417093713.447777-1-lkundrak@v3.sk>
Date:   Fri, 17 Apr 2020 11:37:13 +0200
From:   Lubomir Rintel <lkundrak@...sk>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Jonathan Corbet <corbet@....net>, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, Lubomir Rintel <lkundrak@...sk>
Subject: [PATCH] media: marvell-ccic: Add support for runtime PM

On MMP3, the camera block lives on na separate power island. We want to
turn it off if the CCIC is not in use to conserve power.

Signed-off-by: Lubomir Rintel <lkundrak@...sk>
---
 drivers/media/platform/marvell-ccic/mcam-core.c  |  3 +++
 drivers/media/platform/marvell-ccic/mmp-driver.c | 12 ++++++++----
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/media/platform/marvell-ccic/mcam-core.c b/drivers/media/platform/marvell-ccic/mcam-core.c
index 09775b6624c6b..c2cd1d461bd06 100644
--- a/drivers/media/platform/marvell-ccic/mcam-core.c
+++ b/drivers/media/platform/marvell-ccic/mcam-core.c
@@ -24,6 +24,7 @@
 #include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/videodev2.h>
+#include <linux/pm_runtime.h>
 #include <media/v4l2-device.h>
 #include <media/v4l2-ioctl.h>
 #include <media/v4l2-ctrls.h>
@@ -901,6 +902,7 @@ static void mcam_clk_enable(struct mcam_camera *mcam)
 {
 	unsigned int i;
 
+	pm_runtime_get_sync(mcam->dev);
 	for (i = 0; i < NR_MCAM_CLK; i++) {
 		if (!IS_ERR(mcam->clk[i]))
 			clk_prepare_enable(mcam->clk[i]);
@@ -915,6 +917,7 @@ static void mcam_clk_disable(struct mcam_camera *mcam)
 		if (!IS_ERR(mcam->clk[i]))
 			clk_disable_unprepare(mcam->clk[i]);
 	}
+	pm_runtime_put(mcam->dev);
 }
 
 /* ---------------------------------------------------------------------- */
diff --git a/drivers/media/platform/marvell-ccic/mmp-driver.c b/drivers/media/platform/marvell-ccic/mmp-driver.c
index 92b92255dac66..eec482d16805b 100644
--- a/drivers/media/platform/marvell-ccic/mmp-driver.c
+++ b/drivers/media/platform/marvell-ccic/mmp-driver.c
@@ -24,6 +24,7 @@
 #include <linux/list.h>
 #include <linux/pm.h>
 #include <linux/clk.h>
+#include <linux/pm_runtime.h>
 
 #include "mcam-core.h"
 
@@ -313,10 +314,12 @@ static int mmpcam_probe(struct platform_device *pdev)
 	cam->irq = res->start;
 	ret = devm_request_irq(&pdev->dev, cam->irq, mmpcam_irq, IRQF_SHARED,
 					"mmp-camera", mcam);
-	if (ret == 0) {
-		mmpcam_add_device(cam);
-		return 0;
-	}
+	if (ret)
+		goto out;
+
+	mmpcam_add_device(cam);
+	pm_runtime_enable(&pdev->dev);
+	return 0;
 
 out:
 	fwnode_handle_put(mcam->asd.match.fwnode);
@@ -332,6 +335,7 @@ static int mmpcam_remove(struct mmp_camera *cam)
 
 	mmpcam_remove_device(cam);
 	mccic_shutdown(mcam);
+	pm_runtime_force_suspend(mcam->dev);
 	return 0;
 }
 
-- 
2.26.0