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author | Bryan O'Donoghue <bryan.odonoghue@linaro.org> | 2023-08-30 16:16:10 +0100 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-11-28 17:15:16 +0000 |
commit | e428d0f3e42f350808771e2ff3d55f2328b8b33e (patch) | |
tree | d22226b49528407a0978ea2f5be7a8c12c895196 | |
parent | 820b967c0384e48aef9bbc16189fe8c2ce221b0f (diff) | |
download | linux-stable-e428d0f3e42f350808771e2ff3d55f2328b8b33e.tar.gz linux-stable-e428d0f3e42f350808771e2ff3d55f2328b8b33e.tar.bz2 linux-stable-e428d0f3e42f350808771e2ff3d55f2328b8b33e.zip |
media: qcom: camss: Fix VFE-17x vfe_disable_output()
commit 3143ad282fc08bf995ee73e32a9e40c527bf265d upstream.
There are two problems with the current vfe_disable_output() routine.
Firstly we rightly use a spinlock to protect output->gen2.active_num
everywhere except for in the IDLE timeout path of vfe_disable_output().
Even if that is not racy "in practice" somehow it is by happenstance not
by design.
Secondly we do not get consistent behaviour from this routine. On
sc8280xp 50% of the time I get "VFE idle timeout - resetting". In this
case the subsequent capture will succeed. The other 50% of the time, we
don't hit the idle timeout, never do the VFE reset and subsequent
captures stall indefinitely.
Rewrite the vfe_disable_output() routine to
- Quiesce write masters with vfe_wm_stop()
- Set active_num = 0
remembering to hold the spinlock when we do so followed by
- Reset the VFE
Testing on sc8280xp and sdm845 shows this to be a valid fix.
Fixes: 7319cdf189bb ("media: camss: Add support for VFE hardware version Titan 170")
Cc: stable@vger.kernel.org
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | drivers/media/platform/qcom/camss/camss-vfe-170.c | 22 |
1 files changed, 3 insertions, 19 deletions
diff --git a/drivers/media/platform/qcom/camss/camss-vfe-170.c b/drivers/media/platform/qcom/camss/camss-vfe-170.c index 02494c89da91..168baaa80d4e 100644 --- a/drivers/media/platform/qcom/camss/camss-vfe-170.c +++ b/drivers/media/platform/qcom/camss/camss-vfe-170.c @@ -7,7 +7,6 @@ * Copyright (C) 2020-2021 Linaro Ltd. */ -#include <linux/delay.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/iopoll.h> @@ -494,35 +493,20 @@ static int vfe_enable_output(struct vfe_line *line) return 0; } -static int vfe_disable_output(struct vfe_line *line) +static void vfe_disable_output(struct vfe_line *line) { struct vfe_device *vfe = to_vfe(line); struct vfe_output *output = &line->output; unsigned long flags; unsigned int i; - bool done; - int timeout = 0; - - do { - spin_lock_irqsave(&vfe->output_lock, flags); - done = !output->gen2.active_num; - spin_unlock_irqrestore(&vfe->output_lock, flags); - usleep_range(10000, 20000); - - if (timeout++ == 100) { - dev_err(vfe->camss->dev, "VFE idle timeout - resetting\n"); - vfe_reset(vfe); - output->gen2.active_num = 0; - return 0; - } - } while (!done); spin_lock_irqsave(&vfe->output_lock, flags); for (i = 0; i < output->wm_num; i++) vfe_wm_stop(vfe, output->wm_idx[i]); + output->gen2.active_num = 0; spin_unlock_irqrestore(&vfe->output_lock, flags); - return 0; + vfe_reset(vfe); } /* |