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[24.56.189.226]) by smtp.gmail.com with ESMTPSA id e9e14a558f8ab-3a05900e618sm32570135ab.55.2024.09.12.10.39.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Sep 2024 10:39:05 -0700 (PDT) From: Raul E Rangel To: linux-serial@vger.kernel.org Cc: pmladek@suse.com, rafael.j.wysocki@intel.com, ribalda@chromium.org, Raul E Rangel , Adrian Ratiu , "Borislav Petkov (AMD)" , Greg Kroah-Hartman , Ingo Molnar , Jiri Slaby , Jonathan Corbet , Josh Poimboeuf , Len Brown , "Paul E. McKenney" , "Rafael J. Wysocki" , Robert Moore , Thomas Gleixner , Xiongwei Song , acpica-devel@lists.linux.dev, linux-acpi@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 0/3] Implement ACPI SPCR v3 support and minor earlycon cleanup Date: Thu, 12 Sep 2024 11:36:18 -0600 Message-ID: <20240912173901.3969597-1-rrangel@chromium.org> X-Mailer: git-send-email 2.46.0.662.g92d0881bb0-goog Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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(-)