29 lines
967 B
Diff
29 lines
967 B
Diff
From 34fb077ceed5166f4426daf21287d2ff4c0d65ca Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Thu, 2 Jul 2020 13:53:20 +0100
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Subject: [PATCH] serial: 8250: bcm2835aux - defer if clock is zero
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See: https://github.com/raspberrypi/linux/issues/3700
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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drivers/tty/serial/8250/8250_bcm2835aux.c | 7 +++++++
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1 file changed, 7 insertions(+)
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--- a/drivers/tty/serial/8250/8250_bcm2835aux.c
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+++ b/drivers/tty/serial/8250/8250_bcm2835aux.c
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@@ -182,6 +182,13 @@ static int bcm2835aux_serial_probe(struc
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*/
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up.port.uartclk = uartclk * 2;
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+ /* The clock is only queried at probe time, which means we get one shot
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+ * at this. A zero clock is never going to work and is almost certainly
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+ * due to a parent not being ready, so prefer to defer.
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+ */
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+ if (!up.port.uartclk)
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+ return -EPROBE_DEFER;
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+
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/* register the port */
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ret = serial8250_register_8250_port(&up);
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if (ret < 0) {
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