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[24.56.189.226]) by smtp.gmail.com with ESMTPSA id e9e14a558f8ab-3a05900e618sm32570135ab.55.2024.09.12.10.39.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Sep 2024 10:39:08 -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 , Greg Kroah-Hartman , Jiri Slaby , linux-kernel@vger.kernel.org Subject: [PATCH 2/3] earlycon: Print a notice when uartclk is unknown Date: Thu, 12 Sep 2024 11:36:20 -0600 Message-ID: <20240912113616.2.Id2235082fc6c2d238789dfc3ee923492e9ed7387@changeid> X-Mailer: git-send-email 2.46.0.662.g92d0881bb0-goog In-Reply-To: <20240912173901.3969597-1-rrangel@chromium.org> References: <20240912173901.3969597-1-rrangel@chromium.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When trying to construct an earlycon=3Duart parameter it's hard to debug why it's not working. In my specific case it was because the default uartclk earlycon assumes doesn't match my hardware. This change adds a notice so that the user is made aware of that this assumption is being made. This should hopefully lead to them adding a option to their earlycon parameter. Booting with `console=3Duart,mmio32,0xfedc9000,115200n8`: [ 0.000000] earlycon: uart: Unknown uartclk, assuming 1843200hz [ 0.000000] earlycon: uart0 at MMIO32 0x00000000fedc9000 (options '11520= 0n8') Signed-off-by: Raul E Rangel Acked-by: Greg Kroah-Hartman Reviewed-by: Petr Mladek --- drivers/tty/serial/earlycon.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c index ab9af37f6cda35..5a8fe0cb3b1986 100644 --- a/drivers/tty/serial/earlycon.c +++ b/drivers/tty/serial/earlycon.c @@ -145,8 +145,12 @@ static int __init register_earlycon(char *buf, const s= truct earlycon_id *match) buf =3D NULL; =20 spin_lock_init(&port->lock); - if (!port->uartclk) + if (!port->uartclk) { port->uartclk =3D BASE_BAUD * 16; + if (early_console_dev.baud) + pr_notice("%s: Unknown uartclk, assuming %dhz", + match->name, port->uartclk); + } if (port->mapbase) port->membase =3D earlycon_map(port->mapbase, 64); =20 --=20 2.46.0.662.g92d0881bb0-goog