From ed14ab2611bea537c1572c8c4abd859c634a4280 Mon Sep 17 00:00:00 2001
From: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Date: Tue, 16 Jan 2024 16:29:59 -0500
Subject: [PATCH] serial: max310x: improve crystal stable clock detection
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commit 93cd256ab224c2519e7c4e5f58bb4f1ac2bf0965 upstream.
Some people are seeing a warning similar to this when using a crystal:
max310x 11-006c: clock is not stable yet
The datasheet doesn't mention the maximum time to wait for the clock to be
stable when using a crystal, and it seems that the 10ms delay in the driver
is not always sufficient.
Jan Kundrát reported that it took three tries (each separated by 10ms) to
get a stable clock.
Modify behavior to check stable clock ready bit multiple times (20), and
waiting 10ms between each try.
Note: the first draft of the driver originally used a 50ms delay, without
checking the clock stable bit.
Then a loop with 1000 retries was implemented, each time reading the clock
stable bit.
Fixes: 4cf9a888fd3c ("serial: max310x: Check the clock readiness")
Cc: stable@vger.kernel.org
Suggested-by: Jan Kundrát <jan.kundrat@cesnet.cz>
Link: https://www.spinics.net/lists/linux-serial/msg35773.html
Link: https://lore.kernel.org/all/20240110174015.6f20195fde08e5c9e64e5675@hugovil.com/raw
Link: https://github.com/boundarydevices/linux/commit/e5dfe3e4a751392515d78051973190301a37ca9a
Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Link: https://lore.kernel.org/r/20240116213001.3691629-3-hugo@hugovil.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/tty/serial/max310x.c | 21 ++++++++++++++++-----
1 file changed, 16 insertions(+), 5 deletions(-)
diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
index 16d3a6467d14..14537878f985 100644
--- a/drivers/tty/serial/max310x.c
+++ b/drivers/tty/serial/max310x.c
@@ -235,6 +235,10 @@
#define MAX310x_REV_MASK (0xf8)
#define MAX310X_WRITE_BIT 0x80
+/* Crystal-related definitions */
+#define MAX310X_XTAL_WAIT_RETRIES 20 /* Number of retries */
+#define MAX310X_XTAL_WAIT_DELAY_MS 10 /* Delay between retries */
+
/* MAX3107 specific */
#define MAX3107_REV_ID (0xa0)
@@ -610,12 +614,19 @@ static int max310x_set_ref_clk(struct device *dev, struct max310x_port *s,
/* Wait for crystal */
if (xtal) {
- unsigned int val = 0;
- msleep(10);
- regmap_read(s->regmap, MAX310X_STS_IRQSTS_REG, &val);
- if (!(val & MAX310X_STS_CLKREADY_BIT)) {
+ bool stable = false;
+ unsigned int try = 0, val = 0;
+
+ do {
+ msleep(MAX310X_XTAL_WAIT_DELAY_MS);
+ regmap_read(s->regmap, MAX310X_STS_IRQSTS_REG, &val);
+
+ if (val & MAX310X_STS_CLKREADY_BIT)
+ stable = true;
+ } while (!stable && (++try < MAX310X_XTAL_WAIT_RETRIES));
+
+ if (!stable)
dev_warn(dev, "clock is not stable yet\n");
- }
}
return (int)bestfreq;