linux-kernel - [PATCH 5.6 29/41] serial: 8250: Enable 16550A variants by default on non-x86

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Message-Id: <20200609174114.888204498@linuxfoundation.org>
Date:   Tue,  9 Jun 2020 19:45:31 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Vladimir Oltean <vladimir.oltean@....com>,
        Maxim Kochetkov <fido_max@...ox.ru>,
        Josh Triplett <josh@...htriplett.org>
Subject: [PATCH 5.6 29/41] serial: 8250: Enable 16550A variants by default on non-x86

From: Josh Triplett <josh@...htriplett.org>

commit 15a3f03d5ec0118f1e5db3fc1018686e72744e37 upstream.

Some embedded devices still use these serial ports; make sure they're
still enabled by default on architectures more likely to have them, to
avoid rendering someone's console unavailable.

Reported-by: Vladimir Oltean <vladimir.oltean@....com>
Reported-by: Maxim Kochetkov <fido_max@...ox.ru>
Fixes: dc56ecb81a0a ("serial: 8250: Support disabling mdelay-filled probes of 16550A variants")
Cc: stable <stable@...r.kernel.org>
Signed-off-by: Josh Triplett <josh@...htriplett.org>
Link: https://lore.kernel.org/r/a20b5fb7dd295cfb48160eecf4bdebd76332d67d.1590509426.git.josh@joshtriplett.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/tty/serial/8250/Kconfig |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -63,6 +63,7 @@ config SERIAL_8250_PNP
 config SERIAL_8250_16550A_VARIANTS
 	bool "Support for variants of the 16550A serial port"
 	depends on SERIAL_8250
+	default !X86
 	help
 	  The 8250 driver can probe for many variants of the venerable 16550A
 	  serial port. Doing so takes additional time at boot.