linux-kernel - [PATCH v2 1/2] media: mipi-csis: Add check for clk

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Message-Id: <20241122195322.42289-2-jiashengjiangcool@gmail.com>
Date: Fri, 22 Nov 2024 19:53:22 +0000
From: Jiasheng Jiang <jiashengjiangcool@...il.com>
To: krzk@...nel.org
Cc: sylvester.nawrocki@...il.com,
	mchehab@...nel.org,
	dron0gus@...il.com,
	tomasz.figa@...il.com,
	alim.akhtar@...sung.com,
	kyungmin.park@...sung.com,
	laurent.pinchart@...asonboard.com,
	linux-media@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Jiasheng Jiang <jiashengjiangcool@...il.com>
Subject: [PATCH v2 1/2] media: mipi-csis: Add check for clk_enable()

Add check for the return value of clk_enable() to gurantee the success.

Fixes: b5f1220d587d ("[media] v4l: Add v4l2 subdev driver for S5P/EXYNOS4 MIPI-CSI receivers")
Signed-off-by: Jiasheng Jiang <jiashengjiangcool@...il.com>
---
Changelog:

v1 -> v2:

1. Power off the phy and disble regulators when clk_enable() fails.
2. Remove a redundant space before the label "unlock".
---
 drivers/media/platform/samsung/exynos4-is/mipi-csis.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/samsung/exynos4-is/mipi-csis.c b/drivers/media/platform/samsung/exynos4-is/mipi-csis.c
index 63f3eecdd7e6..47b8e043aae9 100644
--- a/drivers/media/platform/samsung/exynos4-is/mipi-csis.c
+++ b/drivers/media/platform/samsung/exynos4-is/mipi-csis.c
@@ -940,13 +940,19 @@ static int s5pcsis_pm_resume(struct device *dev, bool runtime)
 					       state->supplies);
 			goto unlock;
 		}
-		clk_enable(state->clock[CSIS_CLK_GATE]);
+		ret = clk_enable(state->clock[CSIS_CLK_GATE]);
+		if (ret) {
+			phy_power_off(state->phy);
+			regulator_bulk_disable(CSIS_NUM_SUPPLIES,
+							state->supplies);
+			goto unlock;
+		}
 	}
 	if (state->flags & ST_STREAMING)
 		s5pcsis_start_stream(state);
 
 	state->flags &= ~ST_SUSPENDED;
- unlock:
+unlock:
 	mutex_unlock(&state->lock);
 	return ret ? -EAGAIN : 0;
 }
-- 
2.25.1