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122 lines
3.4 KiB
Diff
122 lines
3.4 KiB
Diff
From bf1805e0c8c4fc05e2a13b0a03b510ff4e523418 Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.org>
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Date: Tue, 29 Jan 2019 15:56:10 +0000
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Subject: [PATCH] media:bcm2835-unicam: Power on subdev on
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open/release, not streaming
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The driver was powering on the source subdevice as part of STREAMON,
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and powering it off in STREAMOFF. This isn't so great if there is a
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significant amount of setup required for your device.
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Copy the approach taken in the Atmel ISC driver where s_power(1) is called
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on first file handle open, and s_power(0) is called on the last release.
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See https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=232437
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
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---
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.../media/platform/bcm2835/bcm2835-unicam.c | 68 +++++++++++++++----
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1 file changed, 54 insertions(+), 14 deletions(-)
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--- a/drivers/media/platform/bcm2835/bcm2835-unicam.c
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+++ b/drivers/media/platform/bcm2835/bcm2835-unicam.c
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@@ -1237,11 +1237,6 @@ static int unicam_start_streaming(struct
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unicam_err(dev, "Failed to enable CSI clock: %d\n", ret);
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goto err_pm_put;
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}
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- ret = v4l2_subdev_call(dev->sensor, core, s_power, 1);
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- if (ret < 0 && ret != -ENOIOCTLCMD) {
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- unicam_err(dev, "power on failed in subdev\n");
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- goto err_clock_unprepare;
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- }
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dev->streaming = 1;
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unicam_start_rx(dev, addr);
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@@ -1256,8 +1251,6 @@ static int unicam_start_streaming(struct
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err_disable_unicam:
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unicam_disable(dev);
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- v4l2_subdev_call(dev->sensor, core, s_power, 0);
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-err_clock_unprepare:
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clk_disable_unprepare(dev->clock);
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err_pm_put:
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unicam_runtime_put(dev);
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@@ -1306,11 +1299,6 @@ static void unicam_stop_streaming(struct
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dev->next_frm = NULL;
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spin_unlock_irqrestore(&dev->dma_queue_lock, flags);
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- if (v4l2_subdev_has_op(dev->sensor, core, s_power)) {
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- if (v4l2_subdev_call(dev->sensor, core, s_power, 0) < 0)
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- unicam_err(dev, "power off failed in subdev\n");
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- }
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-
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clk_disable_unprepare(dev->clock);
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unicam_runtime_put(dev);
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}
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@@ -1543,11 +1531,63 @@ static const struct vb2_ops unicam_video
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.stop_streaming = unicam_stop_streaming,
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};
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+/*
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+ * unicam_open : This function is based on the v4l2_fh_open helper function.
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+ * It has been augmented to handle sensor subdevice power management,
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+ */
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+static int unicam_open(struct file *file)
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+{
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+ struct unicam_device *dev = video_drvdata(file);
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+ int ret;
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+
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+ mutex_lock(&dev->lock);
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+
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+ ret = v4l2_fh_open(file);
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+ if (ret) {
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+ unicam_err(dev, "v4l2_fh_open failed\n");
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+ goto unlock;
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+ }
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+
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+ if (!v4l2_fh_is_singular_file(file))
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+ goto unlock;
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+
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+ ret = v4l2_subdev_call(dev->sensor, core, s_power, 1);
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+ if (ret < 0 && ret != -ENOIOCTLCMD) {
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+ v4l2_fh_release(file);
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+ goto unlock;
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+ }
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+
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+unlock:
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+ mutex_unlock(&dev->lock);
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+ return ret;
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+}
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+
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+static int unicam_release(struct file *file)
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+{
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+ struct unicam_device *dev = video_drvdata(file);
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+ struct v4l2_subdev *sd = dev->sensor;
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+ bool fh_singular;
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+ int ret;
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+
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+ mutex_lock(&dev->lock);
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+
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+ fh_singular = v4l2_fh_is_singular_file(file);
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+
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+ ret = _vb2_fop_release(file, NULL);
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+
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+ if (fh_singular)
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+ v4l2_subdev_call(sd, core, s_power, 0);
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+
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+ mutex_unlock(&dev->lock);
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+
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+ return ret;
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+}
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+
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/* unicam capture driver file operations */
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static const struct v4l2_file_operations unicam_fops = {
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.owner = THIS_MODULE,
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- .open = v4l2_fh_open,
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- .release = vb2_fop_release,
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+ .open = unicam_open,
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+ .release = unicam_release,
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.read = vb2_fop_read,
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.poll = vb2_fop_poll,
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.unlocked_ioctl = video_ioctl2,
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