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[24.56.189.226]) by smtp.gmail.com with ESMTPSA id e9e14a558f8ab-3a05900e618sm32570135ab.55.2024.09.12.10.39.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Sep 2024 10:39:06 -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)" , Ingo Molnar , Jonathan Corbet , Josh Poimboeuf , "Paul E. McKenney" , Thomas Gleixner , Xiongwei Song , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/3] Documentation: kernel-parameters: Add uartclk to console=uart Date: Thu, 12 Sep 2024 11:36:19 -0600 Message-ID: <20240912113616.1.Ic8770cb6e660110359b245808105e5310d3fa528@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-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The console=uartXXXXX parameter is just an alias for earlycon=uartXXXX. This means it also accepts the uartclk parameter. Signed-off-by: Raul E Rangel Reviewed-by: Petr Mladek --- Documentation/admin-guide/kernel-parameters.txt | 16 ++++++---------- 1 file changed, 6 insertions(+), 10 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index bc1036e73bc0b4..cd3d44db60457d 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -788,20 +788,16 @@ Documentation/networking/netconsole.rst for an alternative. - uart[8250],io,[,options] - uart[8250],mmio,[,options] - uart[8250],mmio16,[,options] - uart[8250],mmio32,[,options] + uart[8250],io,[,options[,uartclk]] + uart[8250],mmio,[,options[,uartclk]] + uart[8250],mmio16,[,options[,uartclk]] + uart[8250],mmio32,[,options[,uartclk]] uart[8250],0x[,options] Start an early, polled-mode console on the 8250/16550 UART at the specified I/O port or MMIO address, switching to the matching ttyS device later. - MMIO inter-register address stride is either 8-bit - (mmio), 16-bit (mmio16), or 32-bit (mmio32). - If none of [io|mmio|mmio16|mmio32], is assumed - to be equivalent to 'mmio'. 'options' are specified in - the same format described for ttyS above; if unspecified, - the h/w is not re-initialized. + + See the documentation for earlycon=uart hvc Use the hypervisor console device . This is for both Xen and PowerPC hypervisors. 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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-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 When trying to construct an earlycon=uart 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=uart,mmio32,0xfedc9000,115200n8`: [ 0.000000] earlycon: uart: Unknown uartclk, assuming 1843200hz [ 0.000000] earlycon: uart0 at MMIO32 0x00000000fedc9000 (options '115200n8') Signed-off-by: Raul E Rangel --- 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 struct earlycon_id *match) buf = NULL; spin_lock_init(&port->lock); - if (!port->uartclk) + if (!port->uartclk) { port->uartclk = BASE_BAUD * 16; + if (early_console_dev.baud) + pr_notice("%s: Unknown uartclk, assuming %dhz", + match->name, port->uartclk); + } if (port->mapbase) port->membase = earlycon_map(port->mapbase, 64); From patchwork Thu Sep 12 17:36:21 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Raul Rangel X-Patchwork-Id: 828107 Received: from mail-il1-f173.google.com (mail-il1-f173.google.com [209.85.166.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B32ED1BFDEA for ; Thu, 12 Sep 2024 17:39:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.173 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726162753; cv=none; b=DhI1JTJnsMRvBCVA/SDI5oS4uJghNijBRoOojRTDRKIle0Vs3TnP/Xcg7nZOMPFSUzUJ/7t4yjfOdVPq//fKK2Iybr6PvagwvVKilSQLRmg3mcGLIljMZ257TjNuOKVjkr0Proko8Rn3H1OS0tlPs9CHfyyUBbEvXCl+7z7xgfQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726162753; c=relaxed/simple; bh=sdvuNJYXbnl+iyClqdVA5O83W4ftzy+TWXXAq64uN7o=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=dHVPNd7IeG20NNGBOQopXP6203m16AlQ3CmS9cXTRZtH203o/gxh1BDGD0qYg4Leczi2+ivzxIR8925NJZplSJ9WiNAOf0wMXwbVCdfxI5Mv/vE3YU0IwGWmUnt5Zupe6gHnQ4dKVM7E/3qbeDyO7fSvmRH/2LSIH9wMNm99SBM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org; spf=pass smtp.mailfrom=chromium.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b=U1Y3vEOI; arc=none smtp.client-ip=209.85.166.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=chromium.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="U1Y3vEOI" Received: by mail-il1-f173.google.com with SMTP id e9e14a558f8ab-39d4a4e4931so4198905ab.2 for ; Thu, 12 Sep 2024 10:39:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1726162750; x=1726767550; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=qECmHjc9dK1dFT5mGpczd6pcWBHqdXTgofYQGynhgPc=; b=U1Y3vEOItKe8tEuj3rwDpOKtrApa7FG5bxRYPzR0tof42evGHKbnPzFBXaUQsS6KTT znu39CIx0KyRHwig0KURQgTIhGoccC4LB8vDWMzuInXsTft2w3Ggc+qjLR+fzAwEQsgi pj+O5eR0jv35WqhXYJX0RAUKTjBJeN4f1nVCY= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1726162750; x=1726767550; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=qECmHjc9dK1dFT5mGpczd6pcWBHqdXTgofYQGynhgPc=; b=AgFlmNZA4xlbaUYCaHsZEf1j1kC0vl9OHE+gzKrnbxW1E2Er0ogCwFV19EHm5Gj+2U 6ZfMIrbStZwegeeY2UsisX4cvgodKdBw8ZMasK9wClmyNfyCSb4zj3yF8Yjv/rZwQniR ahqKhc1e7F4m9avIhF8ab2jqBGfIG77Ixu/OqETJYhZLb+Hsp5xYHNKqv0UyLPCL5lq7 Mq38Sb9T6tKH3lCkO4cfD8+3o7tC82tFcgzpW9273ki10dOoqNjzpEpibTJG/NwkWG/K 9Pn44zEJq6SLqYNeU9wVmYGuIUP0IUAR8tpZZmIsLBJYz0Yhq0Yh6hHdKbz4O9Ld4VGP /Qzw== X-Gm-Message-State: AOJu0Yz5cZT5K8dMLe4YfCc4Lp1nW1tZ1fhPFrorInwxwjLjCoKvxZve YiM28N98l+VFPKzudzBsjbsan1hhqI12YenECtH/j2/iGo/SaHO8ep1EnOMaVpL0Xds1fwqnjmA = X-Google-Smtp-Source: AGHT+IHL4MH+QIKEB9bCMel4ROL7d0o5CwGYlEvbEC0U2AMuWF6C9AaGEEJwAGhel0XN8qNUrPvZtg== X-Received: by 2002:a92:c24d:0:b0:39f:6fcc:fcc with SMTP id e9e14a558f8ab-3a0848ae8c0mr36173705ab.4.1726162750451; Thu, 12 Sep 2024 10:39:10 -0700 (PDT) Received: from rrangel920.bld.corp.google.com (h24-56-189-226.arvdco.broadband.dynamic.tds.net. [24.56.189.226]) by smtp.gmail.com with ESMTPSA id e9e14a558f8ab-3a05900e618sm32570135ab.55.2024.09.12.10.39.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Sep 2024 10:39:09 -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 , Len Brown , "Rafael J. Wysocki" , Robert Moore , acpica-devel@lists.linux.dev, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 3/3] ACPI: SPCR: Add support for rev 3 Date: Thu, 12 Sep 2024 11:36:21 -0600 Message-ID: <20240912113616.3.I1b7a5033a2191cb0cdbadc2d51666a97f16cc663@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-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Revision 3 supports specifying the UART input clock. This allows for proper computation of the UART divisor when the baud rate is specified. The earlycon code can accept the following format (See `parse_options` in `earlycon.c`.): * ,io|mmio|mmio32|mmio32be,,,, This change makes it so the uartclk is passed along if it's defined in the SPCR table. Booting with `earlycon` and a SPCR v3 table that has the uartclk and baud defined: [ 0.028251] ACPI: SPCR: console: uart,mmio32,0xfedc9000,115200,48000000 [ 0.028267] earlycon: uart0 at MMIO32 0x00000000fedc9000 (options '115200,48000000') [ 0.028272] printk: legacy bootconsole [uart0] enabled Link: https://learn.microsoft.com/en-us/windows-hardware/drivers/serports/serial-port-console-redirection-table Signed-off-by: Raul E Rangel Reviewed-by: Petr Mladek --- drivers/acpi/spcr.c | 5 ++++- include/acpi/actbl3.h | 6 +++--- 2 files changed, 7 insertions(+), 4 deletions(-) diff --git a/drivers/acpi/spcr.c b/drivers/acpi/spcr.c index cd36a97b0ea2c7..67ae42afcc59ef 100644 --- a/drivers/acpi/spcr.c +++ b/drivers/acpi/spcr.c @@ -209,9 +209,12 @@ int __init acpi_parse_spcr(bool enable_earlycon, bool enable_console) if (!baud_rate) { snprintf(opts, sizeof(opts), "%s,%s,0x%llx", uart, iotype, table->serial_port.address); - } else { + } else if (table->header.revision <= 2 || !table->uartclk) { snprintf(opts, sizeof(opts), "%s,%s,0x%llx,%d", uart, iotype, table->serial_port.address, baud_rate); + } else { + snprintf(opts, sizeof(opts), "%s,%s,0x%llx,%d,%d", uart, iotype, + table->serial_port.address, baud_rate, table->uartclk); } pr_info("console: %s\n", opts); diff --git a/include/acpi/actbl3.h b/include/acpi/actbl3.h index 8f775e3a08fdfb..afe45a2379866a 100644 --- a/include/acpi/actbl3.h +++ b/include/acpi/actbl3.h @@ -92,10 +92,10 @@ struct acpi_table_slit { /******************************************************************************* * * SPCR - Serial Port Console Redirection table - * Version 2 + * Version 3 * * Conforms to "Serial Port Console Redirection Table", - * Version 1.03, August 10, 2015 + * Version 1.08, October 7, 2021 * ******************************************************************************/ @@ -120,7 +120,7 @@ struct acpi_table_spcr { u8 pci_function; u32 pci_flags; u8 pci_segment; - u32 reserved2; + u32 uartclk; }; /* Masks for pci_flags field above */