linux-kernel - [PATCH v1 5/9] media: qcom: camss: Fix VFE-480 vfe_disable

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Message-ID: <20230822161620.1915110-6-bryan.odonoghue@linaro.org>
Date:   Tue, 22 Aug 2023 17:16:16 +0100
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     rfoss@...nel.org, todor.too@...il.com, bryan.odonoghue@...aro.org,
        agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        mchehab@...nel.org, hverkuil-cisco@...all.nl,
        laurent.pinchart@...asonboard.com, sakari.ailus@...ux.intel.com,
        andrey.konovalov@...aro.org
Cc:     linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: [PATCH v1 5/9] media: qcom: camss: Fix VFE-480 vfe_disable_output()

vfe-480 is copied from vfe-17x and has the same racy idle timeout bug as in
17x.

Fix the vfe_disable_output() logic to no longer be racy and to conform
to the 17x way of quiescing and then resetting the VFE.

Fixes: 4edc8eae715c ("media: camss: Add initial support for VFE hardware version Titan 480")
Cc: stable@...r.kernel.org
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
---
 .../media/platform/qcom/camss/camss-vfe-480.c | 19 +++----------------
 1 file changed, 3 insertions(+), 16 deletions(-)

diff --git a/drivers/media/platform/qcom/camss/camss-vfe-480.c b/drivers/media/platform/qcom/camss/camss-vfe-480.c
index f70aad2e8c237..a64d660abc538 100644
--- a/drivers/media/platform/qcom/camss/camss-vfe-480.c
+++ b/drivers/media/platform/qcom/camss/camss-vfe-480.c
@@ -334,28 +334,15 @@ static int vfe_disable_output(struct vfe_line *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);
 
+	vfe_reset(vfe);
+
 	return 0;
 }
 
-- 
2.41.0