From: "Pali Rohár" <pali@kernel.org>
To: "Stefan Roese" <sr@denx.de>, "Marek Behún" <marek.behun@nic.cz>
Cc: u-boot@lists.denx.de
Subject: [PATCH u-boot-mvebu] watchdog: armada_37xx: Probe driver also when watchdog is already running
Date: Wed, 23 Feb 2022 14:21:40 +0100 [thread overview]
Message-ID: <20220223132140.12529-1-pali@kernel.org> (raw)
If Armada 37xx watchdog is started before U-Boot then CNTR_CTRL_ACTIVE bit
is set, U-Boot armada-37xx-wdt.c driver fails to initialize and so U-Boot
is unable to use or kick this watchdog.
Do not check for CNTR_CTRL_ACTIVE bit and always initialize watchdog. Same
behavior is implemented in Linux kernel driver.
This change allows to activate watchdog in firmware which loads U-Boot.
Signed-off-by: Pali Rohár <pali@kernel.org>
---
drivers/watchdog/armada-37xx-wdt.c | 17 +++--------------
1 file changed, 3 insertions(+), 14 deletions(-)
diff --git a/drivers/watchdog/armada-37xx-wdt.c b/drivers/watchdog/armada-37xx-wdt.c
index 2e119b9b5aad..bacebbc7926a 100644
--- a/drivers/watchdog/armada-37xx-wdt.c
+++ b/drivers/watchdog/armada-37xx-wdt.c
@@ -58,13 +58,11 @@ static void counter_disable(struct a37xx_wdt *priv, int id)
clrbits_le32(priv->reg + CNTR_CTRL(id), CNTR_CTRL_ENABLE);
}
-static int init_counter(struct a37xx_wdt *priv, int id, u32 mode, u32 trig_src)
+static void init_counter(struct a37xx_wdt *priv, int id, u32 mode, u32 trig_src)
{
u32 reg;
reg = readl(priv->reg + CNTR_CTRL(id));
- if (reg & CNTR_CTRL_ACTIVE)
- return -EBUSY;
reg &= ~(CNTR_CTRL_MODE_MASK | CNTR_CTRL_PRESCALE_MASK |
CNTR_CTRL_TRIG_SRC_MASK);
@@ -79,8 +77,6 @@ static int init_counter(struct a37xx_wdt *priv, int id, u32 mode, u32 trig_src)
reg |= trig_src;
writel(reg, priv->reg + CNTR_CTRL(id));
-
- return 0;
}
static int a37xx_wdt_reset(struct udevice *dev)
@@ -116,16 +112,9 @@ static int a37xx_wdt_expire_now(struct udevice *dev, ulong flags)
static int a37xx_wdt_start(struct udevice *dev, u64 ms, ulong flags)
{
struct a37xx_wdt *priv = dev_get_priv(dev);
- int err;
-
- err = init_counter(priv, 0, CNTR_CTRL_MODE_ONESHOT, 0);
- if (err < 0)
- return err;
- err = init_counter(priv, 1, CNTR_CTRL_MODE_HWSIG,
- CNTR_CTRL_TRIG_SRC_PREV_CNTR);
- if (err < 0)
- return err;
+ init_counter(priv, 0, CNTR_CTRL_MODE_ONESHOT, 0);
+ init_counter(priv, 1, CNTR_CTRL_MODE_HWSIG, CNTR_CTRL_TRIG_SRC_PREV_CNTR);
priv->timeout = ms * priv->clk_rate / 1000 / CNTR_CTRL_PRESCALE_MIN;
--
2.20.1
next reply other threads:[~2022-02-23 13:22 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-23 13:21 Pali Rohár [this message]
2022-02-23 14:35 ` [PATCH u-boot-mvebu] watchdog: armada_37xx: Probe driver also when watchdog is already running Marek Behún
2022-03-04 7:27 ` Stefan Roese
2022-03-08 9:10 ` Stefan Roese
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20220223132140.12529-1-pali@kernel.org \
--to=pali@kernel.org \
--cc=marek.behun@nic.cz \
--cc=sr@denx.de \
--cc=u-boot@lists.denx.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).