linux-kernel - [PATCH 0/3] Implement ACPI SPCR v3 support and minor earlycon cleanup

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Message-ID: <20240912173901.3969597-1-rrangel@chromium.org>
Date: Thu, 12 Sep 2024 11:36:18 -0600
From: Raul E Rangel <rrangel@...omium.org>
To: linux-serial@...r.kernel.org
Cc: pmladek@...e.com,
	rafael.j.wysocki@...el.com,
	ribalda@...omium.org,
	Raul E Rangel <rrangel@...omium.org>,
	Adrian Ratiu <adrian.ratiu@...labora.com>,
	"Borislav Petkov (AMD)" <bp@...en8.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Jiri Slaby <jirislaby@...nel.org>,
	Jonathan Corbet <corbet@....net>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	Len Brown <lenb@...nel.org>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Robert Moore <robert.moore@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Xiongwei Song <xiongwei.song@...driver.com>,
	acpica-devel@...ts.linux.dev,
	linux-acpi@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/3] Implement ACPI SPCR v3 support and minor earlycon cleanup

Getting `earlycon` working on AMD platforms is a bit tricky because the
uartclk is 48MHz. If the uartclk isn't specified, we default to
115200*16 which results in an incorrect divisor computation.

This patch set adds the uartclk to the `console=` documentation,
prints a notice to the user that it's using a default uartclk, and
implements support for SPCR v3 so that the uartclk can be provided
by the firmware.


Raul E Rangel (3):
  Documentation: kernel-parameters: Add uartclk to console=uart
  earlycon: Print a notice when uartclk is unknown
  ACPI: SPCR: Add support for rev 3

 Documentation/admin-guide/kernel-parameters.txt | 16 ++++++----------
 drivers/acpi/spcr.c                             |  5 ++++-
 drivers/tty/serial/earlycon.c                   |  6 +++++-
 include/acpi/actbl3.h                           |  6 +++---
 4 files changed, 18 insertions(+), 15 deletions(-)

-- 
2.46.0.662.g92d0881bb0-goog