linux-kernel - [PATCH 5.4 105/183] clk: qcom: reset: Allow specifying custom reset delay

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Date: Sun, 24 Mar 2024 19:45:18 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Stephan Gerhold <stephan.gerhold@...nkonzept.com>,
	Bjorn Andersson <andersson@...nel.org>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 105/183] clk: qcom: reset: Allow specifying custom reset delay

From: Stephan Gerhold <stephan.gerhold@...nkonzept.com>

[ Upstream commit 2cb8a39b6781ea23accd1fa93b3ad000d0948aec ]

The amount of time required between asserting and deasserting the reset
signal can vary depending on the involved hardware component. Sometimes
1 us might not be enough and a larger delay is necessary to conform to
the specifications.

Usually this is worked around in the consuming drivers, by replacing
reset_control_reset() with a sequence of reset_control_assert(), waiting
for a custom delay, followed by reset_control_deassert().

However, in some cases the driver making use of the reset is generic and
can be used with different reset controllers. In this case the reset
time requirement is better handled directly by the reset controller
driver.

Make this possible by adding an "udelay" field to the qcom_reset_map
that allows setting a different reset delay (in microseconds).

Signed-off-by: Stephan Gerhold <stephan.gerhold@...nkonzept.com>
Signed-off-by: Bjorn Andersson <andersson@...nel.org>
Link: https://lore.kernel.org/r/20220706134132.3623415-4-stephan.gerhold@kernkonzept.com
Stable-dep-of: 2f8cf2c3f3e3 ("clk: qcom: reset: Ensure write completion on reset de/assertion")
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/clk/qcom/reset.c | 4 +++-
 drivers/clk/qcom/reset.h | 1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/qcom/reset.c b/drivers/clk/qcom/reset.c
index 819d194be8f7b..2a16adb572d2b 100644
--- a/drivers/clk/qcom/reset.c
+++ b/drivers/clk/qcom/reset.c
@@ -13,8 +13,10 @@

 static int qcom_reset(struct reset_controller_dev *rcdev, unsigned long id)
 {
+	struct qcom_reset_controller *rst = to_qcom_reset_controller(rcdev);
+
 	rcdev->ops->assert(rcdev, id);
-	udelay(1);
+	udelay(rst->reset_map[id].udelay ?: 1); /* use 1 us as default */
 	rcdev->ops->deassert(rcdev, id);
 	return 0;
 }
diff --git a/drivers/clk/qcom/reset.h b/drivers/clk/qcom/reset.h
index 2a08b5e282c77..b8c113582072b 100644
--- a/drivers/clk/qcom/reset.h
+++ b/drivers/clk/qcom/reset.h
@@ -11,6 +11,7 @@
 struct qcom_reset_map {
 	unsigned int reg;
 	u8 bit;
+	u8 udelay;
 };

 struct regmap;
-- 
2.43.0