linux-kernel - [PATCH 08/11] [media] marvell-ccic/mmp: enable clock before accessing registers

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Message-Id: <20181105073054.24407-9-lkundrak@v3.sk>
Date:   Mon,  5 Nov 2018 08:30:51 +0100
From:   Lubomir Rintel <lkundrak@...sk>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Jonathan Corbet <corbet@....net>, linux-media@...r.kernel.org
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lubomir Rintel <lkundrak@...sk>,
        James Cameron <quozl@...top.org>, Pavel Machek <pavel@....cz>
Subject: [PATCH 08/11] [media] marvell-ccic/mmp: enable clock before accessing registers

The access to REG_CLKCTRL or REG_CTRL1 without the clock enabled hangs
the machine. Enable the clock first.

Signed-off-by: Lubomir Rintel <lkundrak@...sk>
---
 drivers/media/platform/marvell-ccic/mmp-driver.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/media/platform/marvell-ccic/mmp-driver.c b/drivers/media/platform/marvell-ccic/mmp-driver.c
index 9e988e527b0d..9c0238f72c40 100644
--- a/drivers/media/platform/marvell-ccic/mmp-driver.c
+++ b/drivers/media/platform/marvell-ccic/mmp-driver.c
@@ -145,6 +145,7 @@ static int mmpcam_power_up(struct mcam_camera *mcam)
  * Turn on power and clocks to the controller.
  */
 	mmpcam_power_up_ctlr(cam);
+	mcam_clk_enable(mcam);
 /*
  * Provide power to the sensor.
  */
@@ -158,8 +159,6 @@ static int mmpcam_power_up(struct mcam_camera *mcam)
 	gpio_set_value(pdata->sensor_reset_gpio, 1); /* reset is active low */
 	mdelay(5);
 
-	mcam_clk_enable(mcam);
-
 	return 0;
 }
 
-- 
2.19.1