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8299d1f057
Rebased RPi foundation patches on linux 5.10.59, removed applied and reverted patches, wireless patches and defconfig patches. bcm2708: boot tested on RPi B+ v1.2 bcm2709: boot tested on RPi 4B v1.1 4G bcm2711: boot tested on RPi 4B v1.1 4G Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
65 lines
2.1 KiB
Diff
65 lines
2.1 KiB
Diff
From a95a3e417cf425d03b3a62c1b34730cfcb21b197 Mon Sep 17 00:00:00 2001
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From: Naushir Patuck <naush@raspberrypi.com>
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Date: Wed, 2 Dec 2020 15:26:09 +0000
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Subject: [PATCH] media: bcm2835-unicam: Return early from
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stop_streaming() if stopped
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clk_disable_unprepare() is called unconditionally in stop_streaming().
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This is incorrect in the cases where start_streaming() fails, and
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unprepares all clocks as part of the failure cleanup. To avoid this,
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ensure that clk_disable_unprepare() is only called in stop_streaming()
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if the clocks are in a prepared state.
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Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
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---
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drivers/media/platform/bcm2835/bcm2835-unicam.c | 16 +++++++++-------
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1 file changed, 9 insertions(+), 7 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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@@ -426,6 +426,8 @@ struct unicam_device {
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struct clk *clock;
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/* vpu clock handle */
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struct clk *vpu_clock;
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+ /* clock status for error handling */
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+ bool clocks_enabled;
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/* V4l2 device */
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struct v4l2_device v4l2_dev;
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struct media_device mdev;
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@@ -1724,6 +1726,7 @@ static int unicam_start_streaming(struct
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goto err_disable_unicam;
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}
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+ dev->clocks_enabled = true;
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return 0;
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err_disable_unicam:
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@@ -1750,8 +1753,6 @@ static void unicam_stop_streaming(struct
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node->streaming = false;
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if (node->pad_id == IMAGE_PAD) {
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- int ret;
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-
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/*
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* Stop streaming the sensor and disable the peripheral.
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* We cannot continue streaming embedded data with the
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@@ -1762,12 +1763,13 @@ static void unicam_stop_streaming(struct
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unicam_disable(dev);
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- ret = clk_set_min_rate(dev->vpu_clock, 0);
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- if (ret)
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- unicam_err(dev, "failed to reset the min VPU clock\n");
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+ if (dev->clocks_enabled) {
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+ if (clk_set_min_rate(dev->vpu_clock, 0))
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+ unicam_err(dev, "failed to reset the min VPU clock\n");
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- clk_disable_unprepare(dev->vpu_clock);
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- clk_disable_unprepare(dev->clock);
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+ clk_disable_unprepare(dev->vpu_clock);
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+ clk_disable_unprepare(dev->clock);
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+ }
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unicam_runtime_put(dev);
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} else if (node->pad_id == METADATA_PAD) {
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