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67 lines
2.1 KiB
Diff
67 lines
2.1 KiB
Diff
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From 6a0ae67b699bef301e835b814a416067567ecd39 Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Wed, 3 Apr 2024 16:06:08 +0100
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Subject: [PATCH 1039/1085] media: bcm2835-unicam: Add option for a GPIO to
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reflect FS/FE timing
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The legacy stack had an option to have a GPIO track frame start and
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end events to give basic synchronisation to the incoming image stream.
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https://forums.raspberrypi.com/viewtopic.php?t=190314
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Replicate this in the kernel Unicam driver.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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drivers/media/platform/bcm2835/bcm2835-unicam.c | 12 ++++++++++++
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1 file changed, 12 insertions(+)
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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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@@ -49,6 +49,7 @@
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/err.h>
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+#include <linux/gpio/consumer.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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@@ -543,6 +544,8 @@ struct unicam_device {
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struct v4l2_device v4l2_dev;
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struct media_device mdev;
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+ struct gpio_desc *sync_gpio;
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+
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/* parent device */
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struct platform_device *pdev;
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/* subdevice async Notifier */
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@@ -943,6 +946,8 @@ static irqreturn_t unicam_isr(int irq, v
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if (fe) {
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bool inc_seq = unicam->frame_started;
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+ if (unicam->sync_gpio)
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+ gpiod_set_value(unicam->sync_gpio, 0);
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/*
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* Ensure we have swapped buffers already as we can't
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* stop the peripheral. If no buffer is available, use a
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@@ -1003,6 +1008,10 @@ static irqreturn_t unicam_isr(int irq, v
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* aka frame start.
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*/
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ts = ktime_get_ns();
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+
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+ if (unicam->sync_gpio)
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+ gpiod_set_value(unicam->sync_gpio, 1);
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+
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for (i = 0; i < ARRAY_SIZE(unicam->node); i++) {
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if (!unicam->node[i].streaming)
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continue;
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@@ -3407,6 +3416,9 @@ static int unicam_probe(struct platform_
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goto err_unicam_put;
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}
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+ unicam->sync_gpio = devm_gpiod_get_optional(&pdev->dev, "sync",
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+ GPIOD_OUT_LOW);
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+
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ret = platform_get_irq(pdev, 0);
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if (ret <= 0) {
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dev_err(&pdev->dev, "No IRQ resource\n");
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