brcm2708: add linux 4.19 support

Boot tested on Raspberry Pi B+ (BCM2708) and Raspberry Pi 2 (BCM2709)

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 121 insertions, 0 deletions

diff --git a/target/linux/brcm2708/patches-4.19/950-0330-media-bcm2835-unicam-Power-on-subdev-on-open-release.patch b/target/linux/brcm2708/patches-4.19/950-0330-media-bcm2835-unicam-Power-on-subdev-on-open-release.patch
new file mode 100644
index 0000000000..d6294cf206
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0330-media-bcm2835-unicam-Power-on-subdev-on-open-release.patch
@@ -0,0 +1,121 @@
+From e627fc071de98ec50c88869b579bb90f15043e3d Mon Sep 17 00:00:00 2001
+From: Dave Stevenson <dave.stevenson@raspberrypi.org>
+Date: Tue, 29 Jan 2019 15:56:10 +0000
+Subject: [PATCH 330/703] media:bcm2835-unicam: Power on subdev on
+ open/release, not streaming
+
+The driver was powering on the source subdevice as part of STREAMON,
+and powering it off in STREAMOFF. This isn't so great if there is a
+significant amount of setup required for your device.
+
+Copy the approach taken in the Atmel ISC driver where s_power(1) is called
+on first file handle open, and s_power(0) is called on the last release.
+
+See https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=232437
+
+Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
+---
+ .../media/platform/bcm2835/bcm2835-unicam.c   | 68 +++++++++++++++----
+ 1 file changed, 54 insertions(+), 14 deletions(-)
+
+--- a/drivers/media/platform/bcm2835/bcm2835-unicam.c
++++ b/drivers/media/platform/bcm2835/bcm2835-unicam.c
+@@ -1237,11 +1237,6 @@ static int unicam_start_streaming(struct
+ 		unicam_err(dev, "Failed to enable CSI clock: %d\n", ret);
+ 		goto err_pm_put;
+ 	}
+-	ret = v4l2_subdev_call(dev->sensor, core, s_power, 1);
+-	if (ret < 0 && ret != -ENOIOCTLCMD) {
+-		unicam_err(dev, "power on failed in subdev\n");
+-		goto err_clock_unprepare;
+-	}
+ 	dev->streaming = 1;
+ 
+ 	unicam_start_rx(dev, addr);
+@@ -1256,8 +1251,6 @@ static int unicam_start_streaming(struct
+ 
+ err_disable_unicam:
+ 	unicam_disable(dev);
+-	v4l2_subdev_call(dev->sensor, core, s_power, 0);
+-err_clock_unprepare:
+ 	clk_disable_unprepare(dev->clock);
+ err_pm_put:
+ 	unicam_runtime_put(dev);
+@@ -1306,11 +1299,6 @@ static void unicam_stop_streaming(struct
+ 	dev->next_frm = NULL;
+ 	spin_unlock_irqrestore(&dev->dma_queue_lock, flags);
+ 
+-	if (v4l2_subdev_has_op(dev->sensor, core, s_power)) {
+-		if (v4l2_subdev_call(dev->sensor, core, s_power, 0) < 0)
+-			unicam_err(dev, "power off failed in subdev\n");
+-	}
+-
+ 	clk_disable_unprepare(dev->clock);
+ 	unicam_runtime_put(dev);
+ }
+@@ -1543,11 +1531,63 @@ static const struct vb2_ops unicam_video
+ 	.stop_streaming		= unicam_stop_streaming,
+ };
+ 
++/*
++ * unicam_open : This function is based on the v4l2_fh_open helper function.
++ * It has been augmented to handle sensor subdevice power management,
++ */
++static int unicam_open(struct file *file)
++{
++	struct unicam_device *dev = video_drvdata(file);
++	int ret;
++
++	mutex_lock(&dev->lock);
++
++	ret = v4l2_fh_open(file);
++	if (ret) {
++		unicam_err(dev, "v4l2_fh_open failed\n");
++		goto unlock;
++	}
++
++	if (!v4l2_fh_is_singular_file(file))
++		goto unlock;
++
++	ret = v4l2_subdev_call(dev->sensor, core, s_power, 1);
++	if (ret < 0 && ret != -ENOIOCTLCMD) {
++		v4l2_fh_release(file);
++		goto unlock;
++	}
++
++unlock:
++	mutex_unlock(&dev->lock);
++	return ret;
++}
++
++static int unicam_release(struct file *file)
++{
++	struct unicam_device *dev = video_drvdata(file);
++	struct v4l2_subdev *sd = dev->sensor;
++	bool fh_singular;
++	int ret;
++
++	mutex_lock(&dev->lock);
++
++	fh_singular = v4l2_fh_is_singular_file(file);
++
++	ret = _vb2_fop_release(file, NULL);
++
++	if (fh_singular)
++		v4l2_subdev_call(sd, core, s_power, 0);
++
++	mutex_unlock(&dev->lock);
++
++	return ret;
++}
++
+ /* unicam capture driver file operations */
+ static const struct v4l2_file_operations unicam_fops = {
+ 	.owner		= THIS_MODULE,
+-	.open           = v4l2_fh_open,
+-	.release        = vb2_fop_release,
++	.open           = unicam_open,
++	.release        = unicam_release,
+ 	.read		= vb2_fop_read,
+ 	.poll		= vb2_fop_poll,
+ 	.unlocked_ioctl	= video_ioctl2,