media: rcar-csi2: Use standby mode instead of resetting

Later versions of the datasheet updates the reset procedure to more
closely resemble the standby mode. Update the driver to enter and exit
the standby mode instead of resetting the hardware before and after
streaming is started and stopped. This replaces the software reset
(SRST.SRST) control.

While at it break out the full start and stop procedures from
rcsi2_s_stream() into the existing helper functions.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

2 files changed, 42 insertions, 26 deletions

diff --git a/drivers/media/platform/rcar-vin/Kconfig b/drivers/media/platform/rcar-vin/Kconfig
index 2433ec960010..240ac3f3c941 100644
--- a/drivers/media/platform/rcar-vin/Kconfig
+++ b/drivers/media/platform/rcar-vin/Kconfig
@@ -3,6 +3,7 @@ config VIDEO_RCAR_CSI2
 	tristate "R-Car MIPI CSI-2 Receiver"
 	depends on VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API && OF
 	depends on ARCH_RENESAS || COMPILE_TEST
+	select RESET_CONTROLLER
 	select V4L2_FWNODE
 	help
 	  Support for Renesas R-Car MIPI CSI-2 receiver.
diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c
index a438ec2c218f..75a77fd8d98c 100644
--- a/drivers/media/platform/rcar-vin/rcar-csi2.c
+++ b/drivers/media/platform/rcar-vin/rcar-csi2.c
@@ -14,6 +14,7 @@
 #include <linux/of_graph.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
+#include <linux/reset.h>
 #include <linux/sys_soc.h>
 
 #include <media/v4l2-ctrls.h>
@@ -350,6 +351,7 @@ struct rcar_csi2 {
 	struct device *dev;
 	void __iomem *base;
 	const struct rcar_csi2_info *info;
+	struct reset_control *rstc;
 
 	struct v4l2_subdev subdev;
 	struct media_pad pads[NR_OF_RCAR_CSI2_PAD];
@@ -387,11 +389,19 @@ static void rcsi2_write(struct rcar_csi2 *priv, unsigned int reg, u32 data)
 	iowrite32(data, priv->base + reg);
 }
 
-static void rcsi2_reset(struct rcar_csi2 *priv)
+static void rcsi2_enter_standby(struct rcar_csi2 *priv)
 {
-	rcsi2_write(priv, SRST_REG, SRST_SRST);
+	rcsi2_write(priv, PHYCNT_REG, 0);
+	rcsi2_write(priv, PHTC_REG, PHTC_TESTCLR);
+	reset_control_assert(priv->rstc);
 	usleep_range(100, 150);
-	rcsi2_write(priv, SRST_REG, 0);
+	pm_runtime_put(priv->dev);
+}
+
+static void rcsi2_exit_standby(struct rcar_csi2 *priv)
+{
+	pm_runtime_get_sync(priv->dev);
+	reset_control_deassert(priv->rstc);
 }
 
 static int rcsi2_wait_phy_start(struct rcar_csi2 *priv)
@@ -462,7 +472,7 @@ static int rcsi2_calc_mbps(struct rcar_csi2 *priv, unsigned int bpp)
 	return mbps;
 }
 
-static int rcsi2_start(struct rcar_csi2 *priv)
+static int rcsi2_start_receiver(struct rcar_csi2 *priv)
 {
 	const struct rcar_csi2_format *format;
 	u32 phycnt, vcdt = 0, vcdt2 = 0;
@@ -506,7 +516,6 @@ static int rcsi2_start(struct rcar_csi2 *priv)
 
 	/* Init */
 	rcsi2_write(priv, TREF_REG, TREF_TREF);
-	rcsi2_reset(priv);
 	rcsi2_write(priv, PHTC_REG, 0);
 
 	/* Configure */
@@ -564,19 +573,36 @@ static int rcsi2_start(struct rcar_csi2 *priv)
 	return 0;
 }
 
-static void rcsi2_stop(struct rcar_csi2 *priv)
+static int rcsi2_start(struct rcar_csi2 *priv)
 {
-	rcsi2_write(priv, PHYCNT_REG, 0);
+	int ret;
 
-	rcsi2_reset(priv);
+	rcsi2_exit_standby(priv);
 
-	rcsi2_write(priv, PHTC_REG, PHTC_TESTCLR);
+	ret = rcsi2_start_receiver(priv);
+	if (ret) {
+		rcsi2_enter_standby(priv);
+		return ret;
+	}
+
+	ret = v4l2_subdev_call(priv->remote, video, s_stream, 1);
+	if (ret) {
+		rcsi2_enter_standby(priv);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void rcsi2_stop(struct rcar_csi2 *priv)
+{
+	rcsi2_enter_standby(priv);
+	v4l2_subdev_call(priv->remote, video, s_stream, 0);
 }
 
 static int rcsi2_s_stream(struct v4l2_subdev *sd, int enable)
 {
 	struct rcar_csi2 *priv = sd_to_csi2(sd);
-	struct v4l2_subdev *nextsd;
 	int ret = 0;
 
 	mutex_lock(&priv->lock);
@@ -586,27 +612,12 @@ static int rcsi2_s_stream(struct v4l2_subdev *sd, int enable)
 		goto out;
 	}
 
-	nextsd = priv->remote;
-
 	if (enable && priv->stream_count == 0) {
-		pm_runtime_get_sync(priv->dev);
-
 		ret = rcsi2_start(priv);
-		if (ret) {
-			pm_runtime_put(priv->dev);
-			goto out;
-		}
-
-		ret = v4l2_subdev_call(nextsd, video, s_stream, 1);
-		if (ret) {
-			rcsi2_stop(priv);
-			pm_runtime_put(priv->dev);
+		if (ret)
 			goto out;
-		}
 	} else if (!enable && priv->stream_count == 1) {
 		rcsi2_stop(priv);
-		v4l2_subdev_call(nextsd, video, s_stream, 0);
-		pm_runtime_put(priv->dev);
 	}
 
 	priv->stream_count += enable ? 1 : -1;
@@ -936,6 +947,10 @@ static int rcsi2_probe_resources(struct rcar_csi2 *priv,
 	if (irq < 0)
 		return irq;
 
+	priv->rstc = devm_reset_control_get(&pdev->dev, NULL);
+	if (IS_ERR(priv->rstc))
+		return PTR_ERR(priv->rstc);
+
 	return 0;
 }