From nobody Tue Jun 9 01:05:33 2026 Received: from mout02.posteo.de (mout02.posteo.de [185.67.36.66]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3DC8736CDE0 for ; Sun, 24 May 2026 22:35:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.67.36.66 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779662125; cv=none; b=AjWopevh+s/jNFB5C7AhPp3tGmmh2n4CmsEbGnf9mfjqzmDmTGOn36+M3d3l/zHmO6yvJlv6sOj1/vKTlCXP4J2p4ukk3YlW2MUZ3+39fkc1cRm6h4dsR7Nan+KS6zfyYlrJrYQQsdYC6+zJoV1X8iwKdEb3kDkoB9PnHGMPa3I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779662125; c=relaxed/simple; bh=Kgp+nPOc2YwBq+o839BFe0tCcZNBz78NrVGBu2uaB9o=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=aWdGD7nSFHsWUn5e9UougfhgYpiS09pGN0tzKUIHNC/LyOK9s7zndVCH3t7U1qrzjl6wW7QTiM0JyY02HYAll8OkE3pbY6p7EaRowfiVBb1SBjX5+btG1BaIDKTxMKARE34kBLKNytpBvxV8ooYiF/zZAzuXLbag2xPVSG7vqp0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=posteo.de; spf=pass smtp.mailfrom=posteo.de; dkim=pass (2048-bit key) header.d=posteo.de header.i=@posteo.de header.b=Rs5PlUSV; arc=none smtp.client-ip=185.67.36.66 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=posteo.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=posteo.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=posteo.de header.i=@posteo.de header.b="Rs5PlUSV" Received: from submission (posteo.de [185.67.36.169]) by mout02.posteo.de (Postfix) with ESMTPS id 6E676240101 for ; Mon, 25 May 2026 00:35:14 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=posteo.de; s=2017; t=1779662114; bh=j3V5mw/r4cvhEOyHjLtU/U6FkOUzn5/59uAk6LoHNCQ=; h=From:Date:Subject:MIME-Version:Content-Type: Content-Transfer-Encoding:Message-Id:To:Cc:Autocrypt:OpenPGP:From; b=Rs5PlUSVtsbF6tLVeGfD7fndf6XvPVBUEn9q9guJJ6KeVs8SDf4SEoP3LgpukPqOr RdJ6qjPiw7gAQo0KZU8TUm4EhqeLUARmgKIX/eJjuem0wiRUsrrSDwzPOrneucvZLZ Rvwp/sdCdfqQw7iOMvNhVTCwJR0sh7l4A55tu7lApvdyy3IDx8eebBoTJdkHzCv/vO xuLjGPAln0sVOR9Sz8+IE22cv9TY1bznvs1E7bpbEENHiBPagj+3bBcXWzpfP0PfL9 FCns6qbC5XR1u4jhBFD62XnYD35XxQPMG2VYfV4GeC5LTYs8DXjVzO7BfwLGSIakA8 LVKemcdVgaKmw== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4gNv3N2L2jz6twB; Mon, 25 May 2026 00:35:12 +0200 (CEST) From: Markus Probst Date: Sun, 24 May 2026 22:35:13 +0000 Subject: [PATCH v2 1/2] serial: earlycon: add uart_clk_freq parameter Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260525-acpi_spcr-v2-1-c042089d73ca@posteo.de> References: <20260525-acpi_spcr-v2-0-c042089d73ca@posteo.de> In-Reply-To: <20260525-acpi_spcr-v2-0-c042089d73ca@posteo.de> To: "Rafael J. Wysocki" , Len Brown , Geert Uytterhoeven , Thomas Bogendoerfer , Ard Biesheuvel , Ilias Apalodimas , Greg Kroah-Hartman , Jiri Slaby Cc: linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-efi@vger.kernel.org, linux-serial@vger.kernel.org, Markus Probst X-Developer-Signature: v=1; a=openpgp-sha256; l=5692; i=markus.probst@posteo.de; h=from:subject:message-id; bh=Kgp+nPOc2YwBq+o839BFe0tCcZNBz78NrVGBu2uaB9o=; b=owEBiQJ2/ZANAwAIATR2H/jnrUPSAcsmYgBqE30dPWishtR7zipcVuAUP/5LkSsecEC1sb1oV k2YmTU0y2+JAk8EAAEIADkWIQSCdBjE9KxY53IwxHM0dh/4561D0gUCahN9HRsUgAAAAAAEAA5t YW51MiwyLjUrMS4xMiwyLDIACgkQNHYf+OetQ9K/Ag//c4mlww5OIxF+Lddec487aYdzVPzrkqM jqiWXqwt3oFBbPDtUOWxB6Gr12l2ptQn605Fznrk7vW1rNLdstQXawu6oRHCKWt+th7BdOzkAEz eVsJ08wSWZ71p88EpinykmaLwBd5UByanNdJO0/IU5SSWyUEmgfyXWuCoDPhynTvlP3aqjr9r5F SwrRrxBnk5nVQ4GmH5xQ6SukqbI4yVTnsE6CkpD16Ir5voBRVzDufDr0An3MMxwsSQ7Zc1ne2zC biLGQl6JZwcn1w0Cqsc5d2/27l8cQhW5x+msGol0CpwdsCcznjC8QUybb5S4lpy82sM2zyS35TR +za859PWcLviJaUn+qNJhDBJXgSwcn+BNLQucOv9PJglpcuz26yXfaRphempH1c04KbpKbN1fwu jXgkHhEhFG91GHvh2hdXzZvh7Que0swtniG1hTB0w6RYTTViAbizf7GtcBdoM8DFdvr/4crfZaf JrU86JMdmCl5AtJW+4tNdphVajEZq6cGZ4cAiBAZzrvi0hDZMGqYfXkfaCjK6CeWDUf8fE7cfFC BFUKnM8j9pa6lT2uNkBpZ8KfuVf6otWr+CJbuZa+BBnG2cG8Suk7zsikD8Kewtq4B5zvTaXK9AU 1zb2TVp8CsUo8VC4oOqZDt4SzvQG827kY+jeJUNVlE8b6AaN3EfI= X-Developer-Key: i=markus.probst@posteo.de; a=openpgp; fpr=827418C4F4AC58E77230C47334761FF8E7AD43D2 Autocrypt: addr=markus.probst@posteo.de; prefer-encrypt=mutual; keydata=xsFNBGiDvXgBEADAXUceKafpl46S35UmDh2wRvvx+UfZbcTjeQOlSwKP7YVJ4JOZrVs93qReNLkO WguIqPBxR9blQ4nyYrqSCV+MMw/3ifyXIm6Pw2YRUDg+WTEOjTixRCoWDgUj1nOsvJ9tVAm76Ww+ /pAnepVRafMID0rqEfD9oGv1YrfpeFJhyE2zUw3SyyNLIKWD6QeLRhKQRbSnsXhGLFBXCqt9k5JA RhgQof9zvztcCVlT5KVvuyfC4H+HzeGmu9201BVyihJwKdcKPq+n/aY5FUVxNTgtI9f8wIbmfAja oT1pjXSp+dszakA98fhONM98pOq723o/1ZGMZukyXFfsDGtA3BB79HoopHKujLGWAGskzClwTjRQ xBqxh/U/lL1pc+0xPWikTNCmtziCOvv0KA0arDOMQlyFvImzX6oGVgE4ksKQYbMZ3Ikw6L1Rv1J+ FvN0aNwOKgL2ztBRYscUGcQvA0Zo1fGCAn/BLEJvQYShWKeKqjyncVGoXFsz2AcuFKe1pwETSsN6 OZncjy32e4ktgs07cWBfx0v62b8md36jau+B6RVnnodaA8++oXl3FRwiEW8XfXWIjy4umIv93tb8 8ekYsfOfWkTSewZYXGoqe4RtK80ulMHb/dh2FZQIFyRdN4HOmB4FYO5sEYFr9YjHLmDkrUgNodJC XCeMe4BO4iaxUQARAQABzRdtYXJrdXMucHJvYnN0QHBvc3Rlby5kZcLBkQQTAQgAOxYhBIJ0GMT0 rFjncjDEczR2H/jnrUPSBQJog714AhsDBQsJCAcCAiICBhUKCQgLAgQWAgMBAh4HAheAAAoJEDR2 H/jnrUPSgdkQAISaTk2D345ehXEkn5z2yUEjaVjHIE7ziqRaOgn/QanCgeTUinIv6L6QXUFvvIfH 1OLPwQ1hfvEg9NnNLyFezWSy6jvoVBTIPqicD/r3FkithnQ1IDkdSjrarPMxJkvuh3l7XZHo49GV HQ8i5zh5w4YISrcEtE99lJisvni2Jqx7we5tey9voQFDyM8jxlSWv3pmoUTCtBkX/eKHJXosgsuS B4TGDCVPOjla/emI5c9MhMG7O4WEEmoSdPbmraPw66YZD6uLyhV4DPHbiDWRzXWnClHSyjB9rky9 lausFxogvu4l9H+KDsXIadNDWdLdu1/enS/wDd9zh5S78rY2jeXaG4mnf4seEKamZ7KQ6FIHrcyP ezdDzssPQcTQcGRMQzCn6wP3tlGk7rsfmyHMlFqdRoNNv+ZER/OkmZFPW655zRfbMi0vtrqK2Awm 9ggobb1oktfd9PPNXMUY+DNVlgR2G7jLnenSoQausLUm0pHoNE8TWFv851Y6SOYnvn488sP1Tki5 F3rKwclawQFHUXTCQw+QSh9ay8xgnNZfH+u9NY7w3gPoeKBOAFcBc2BtzcgekeWS8qgEmm2/oNFV G0ivPQbRx8FjRKbuF7g3YhgNZZ0ac8FneuUtJ2PkSIFTZhaAiC0utvxk0ndmWFiW4acEkMZGrLaM L2zWNjrqwsD2zsFNBGiDvXgBEADCXQy1n7wjRxG12DOVADawjghKcG+5LtEf31WftHKLFbp/HArj BhkT6mj+CCI1ClqY+FYU5CK/s0ScMfLxRGLZ0Ktzawb78vOgBVFT3yB1yWBTewsAXdqNqRooaUNo 8cG/NNJLjhccH/7PO/FWX5qftOVUJ/AIsAhKQJ18Tc8Ik73v427EDxuKb9mTAnYQFA3Ev3hAiVbO 6Rv39amVOfJ8sqwiSUGidj2Fctg2aB5JbeMln0KCUbTD1LhEFepeKypfofAXQbGwaCjAhmkWy/q3 IT1mUrPxOngbxdRoOx1tGUC0HCMUW1sFaJgQPMmDcR0JGPOpgsKnitsSnN7ShcCr1buel7vLnUMD +TAZ5opdoF6HjAvAnBQaijtK6minkrM0seNXnCg0KkV8xhMNa6zCs1rq4GgjNLJue2EmuyHooHA4 7JMoLVHcxVeuNTp6K2+XRx0Pk4e2Lj8IVy9yEYyrywEOC5XRW37KJjsiOAsumi1rkvM7QREWgUDe Xs0+RpxI3QrrANh71fLMRo7LKRF3Gvw13NVCCC9ea20P4PwhgWKStkwO2NO+YJsAoS1QycMi/vKu 0EHhknYXamaSV50oZzHKmX56vEeJHTcngrM8R1SwJCYopCx9gkz90bTVYlitJa5hloWTYeMD7FNj Y6jfVSzgM/K4gMgUNDW/PPGeMwARAQABwsF2BBgBCAAgFiEEgnQYxPSsWOdyMMRzNHYf+OetQ9IF AmiDvXgCGwwACgkQNHYf+OetQ9LHDBAAhk+ab8+WrbS/b1/gYW3q1KDiXU719nCtfkUVXKidW5Ec Idlr5HGt8ilLoxSWT2Zi368iHCXS0WenGgPwlv8ifvB7TOZiiTDZROZkXjEBmU4nYjJ7GymawpWv oQwjMsPuq6ysbzWtOZ7eILx7cI0FjQeJ/Q2baRJub0uAZNwBOxCkAS6lpk5Fntd2u8CWmDQo4SYp xeuQ+pwkp0yEP30RhN2BO2DXiBEGSZSYh+ioGbCHQPIV3iVj0h6lcCPOqopZqyeCfigeacBI0nvN jHWz/spzF3+4OS+3RJvoHtAQmProxyGib8iVsTxgZO3UUi4TSODeEt0i0kHSPY4sCciOyXfAyYoD DFqhRjOEwBBxhr+scU4C1T2AflozvDwq3VSONjrKJUkhd8+WsdXxMdPFgBQuiKKwUy11mz6KQfcR wmDehF3UaUoxa+YIhWPbKmycxuX/D8SvnqavzAeAL1OcRbEI/HsoroVlEFbBRNBZLJUlnTPs8ZcU 4+8rq5YX1GUrJL3jf6SAfSgO7UdkEET3PdcKFYtS+ruV1Cp5V0q4kCfI5jk25iiz8grM2wOzVSsc l1mEkhiEPH87HP0whhb544iioSnumd3HJKL7dzhRegsMizatupp8D65A2JziW0WKopa1iw9fti3A aBeNN4ijKZchBXHPgVx+YtWRHfcm4l8= OpenPGP: url=https://posteo.de/keys/markus.probst@posteo.de.asc; preference=encrypt Add `uart_clk_freq` parameter to `setup_earlycon`. This allows the options string to be reused with `add_preferred_console`, while still allowing to set the uart clock frequency. This will be used in the following commit ("ACPI: SPCR: Support UART clock frequency field"). No logical change intended. Signed-off-by: Markus Probst --- arch/m68k/virt/config.c | 2 +- arch/mips/mti-malta/malta-init.c | 2 +- drivers/acpi/spcr.c | 2 +- drivers/firmware/efi/earlycon.c | 2 +- drivers/tty/serial/earlycon.c | 17 ++++++++++++----- include/linux/serial_core.h | 7 +++++-- 6 files changed, 21 insertions(+), 11 deletions(-) diff --git a/arch/m68k/virt/config.c b/arch/m68k/virt/config.c index b338e2a8da6a..2c35ec15a51b 100644 --- a/arch/m68k/virt/config.c +++ b/arch/m68k/virt/config.c @@ -83,7 +83,7 @@ void __init config_virt(void) =20 snprintf(earlycon, sizeof(earlycon), "early_gf_tty,0x%08x", virt_bi_data.tty.mmio); - setup_earlycon(earlycon); + setup_earlycon(earlycon, 0); =20 mach_init_IRQ =3D virt_init_IRQ; mach_sched_init =3D virt_sched_init; diff --git a/arch/mips/mti-malta/malta-init.c b/arch/mips/mti-malta/malta-i= nit.c index 82b0fd8576a2..88ef17967ced 100644 --- a/arch/mips/mti-malta/malta-init.c +++ b/arch/mips/mti-malta/malta-init.c @@ -75,7 +75,7 @@ static void __init console_config(void) if ((strstr(fw_getcmdline(), "earlycon=3D")) =3D=3D NULL) { sprintf(console_string, "uart8250,io,0x3f8,%d%c%c", baud, parity, bits); - setup_earlycon(console_string); + setup_earlycon(console_string, 0); } =20 if ((strstr(fw_getcmdline(), "console=3D")) =3D=3D NULL) { diff --git a/drivers/acpi/spcr.c b/drivers/acpi/spcr.c index 73cb933fdc89..cfacbe53f279 100644 --- a/drivers/acpi/spcr.c +++ b/drivers/acpi/spcr.c @@ -228,7 +228,7 @@ int __init acpi_parse_spcr(bool enable_earlycon, bool e= nable_console) pr_info("console: %s\n", opts); =20 if (enable_earlycon) - setup_earlycon(opts); + setup_earlycon(opts, 0); =20 if (enable_console) err =3D add_preferred_console(uart, 0, opts + strlen(uart) + 1); diff --git a/drivers/firmware/efi/earlycon.c b/drivers/firmware/efi/earlyco= n.c index 3d060d59968c..0e3c2cb08966 100644 --- a/drivers/firmware/efi/earlycon.c +++ b/drivers/firmware/efi/earlycon.c @@ -221,7 +221,7 @@ static bool __initdata fb_probed; void __init efi_earlycon_reprobe(void) { if (fb_probed) - setup_earlycon("efifb"); + setup_earlycon("efifb", 0); } =20 static int __init efi_earlycon_setup(struct earlycon_device *device, diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c index ab9af37f6cda..a419943e083b 100644 --- a/drivers/tty/serial/earlycon.c +++ b/drivers/tty/serial/earlycon.c @@ -135,11 +135,14 @@ static int __init parse_options(struct earlycon_devic= e *device, char *options) return 0; } =20 -static int __init register_earlycon(char *buf, const struct earlycon_id *m= atch) +static int __init register_earlycon(char *buf, unsigned int uart_clk_freq, + const struct earlycon_id *match) { int err; struct uart_port *port =3D &early_console_dev.port; =20 + port->uartclk =3D uart_clk_freq; + /* On parsing error, pass the options buf to the setup function */ if (buf && !parse_options(&early_console_dev, buf)) buf =3D NULL; @@ -164,7 +167,8 @@ static int __init register_earlycon(char *buf, const st= ruct earlycon_id *match) =20 /** * setup_earlycon - match and register earlycon console - * @buf: earlycon param string + * @buf: earlycon param string + * @uart_clk_freq: uart clock frequency in Hz or 0 for BASE_BAUD*16 * * Registers the earlycon console matching the earlycon specified * in the param string @buf. Acceptable param strings are of the form @@ -177,10 +181,13 @@ static int __init register_earlycon(char *buf, const = struct earlycon_id *match) * string in the 'options' parameter; all other forms set * the parameter to NULL. * + * If the uart clock frequency is specified in the 'options' parameter, + * the value of the param @uart_clk_freq will be ignored. + * * Returns 0 if an attempt to register the earlycon was made, * otherwise negative error code */ -int __init setup_earlycon(char *buf) +int __init setup_earlycon(char *buf, unsigned int uart_clk_freq) { const struct earlycon_id *match; bool empty_compatible =3D true; @@ -209,7 +216,7 @@ int __init setup_earlycon(char *buf) } else buf =3D NULL; =20 - return register_earlycon(buf, match); + return register_earlycon(buf, uart_clk_freq, match); } =20 if (empty_compatible) { @@ -241,7 +248,7 @@ static int __init param_setup_earlycon(char *buf) } } =20 - err =3D setup_earlycon(buf); + err =3D setup_earlycon(buf, 0); if (err =3D=3D -ENOENT || err =3D=3D -EALREADY) return 0; return err; diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index 666430b47899..5c60fda9dd3a 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -1097,10 +1097,13 @@ int of_setup_earlycon(const struct earlycon_id *mat= ch, unsigned long node, =20 #ifdef CONFIG_SERIAL_EARLYCON extern bool earlycon_acpi_spcr_enable __initdata; -int setup_earlycon(char *buf); +int setup_earlycon(char *buf, unsigned int uart_clk_freq); #else static const bool earlycon_acpi_spcr_enable EARLYCON_USED_OR_UNUSED; -static inline int setup_earlycon(char *buf) { return 0; } +static inline int setup_earlycon(char *buf, unsigned int uart_clk_freq) +{ + return 0; +} #endif =20 /* Variant of uart_console_registered() when the console_list_lock is held= . */ --=20 2.53.0 From nobody Tue Jun 9 01:05:33 2026 Received: from mout02.posteo.de (mout02.posteo.de [185.67.36.66]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3DB9936A35F for ; Sun, 24 May 2026 22:35:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.67.36.66 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779662125; cv=none; b=WoGHOrK+NNkOCHie8nOioouEgS4eL69qfNzpLQb5UeE1EQNx9JbmnQacAK8G9xLn1iUj4Zynzc0hsNDv2qvlLzmyP6bhcj87lLcPdOOciHytOqnPVNJNKKD75xK2Xgq3jAsyscvMLEmKSRYfW2ojIHCXX6uXEIqEYcCW4dKD4Hc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779662125; c=relaxed/simple; bh=r1UOA6QDMVbLt10TpU5riUnUKzso2VHkTZeHu02qA0E=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Blgyw5SrK6U8jiPBqvKH8tYu8TtM4UsTvjHCSEnhAKNjY4fNQN2JBKvp56yKIGA0jR2S/xwLjfOo9fXpWJMydKWG6TlVRVq2h9XJk4YsatpBzI1NHatGWGhwfWaAKK8LohrML32pKw51OWTK0NMVYyINjc1gzGwifdtht7JmXsw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=posteo.de; spf=pass smtp.mailfrom=posteo.de; dkim=pass (2048-bit key) header.d=posteo.de header.i=@posteo.de header.b=kmKKGbl7; arc=none smtp.client-ip=185.67.36.66 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=posteo.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=posteo.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=posteo.de header.i=@posteo.de header.b="kmKKGbl7" Received: from submission (posteo.de [185.67.36.169]) by mout02.posteo.de (Postfix) with ESMTPS id BD3E6240103 for ; Mon, 25 May 2026 00:35:15 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=posteo.de; s=2017; t=1779662115; bh=21o/xwwmDVfuFXFMoGsY/mGvvY5gAZ5X0zqmGuYe3QU=; h=From:Date:Subject:MIME-Version:Content-Type: Content-Transfer-Encoding:Message-Id:To:Cc:Autocrypt:OpenPGP:From; b=kmKKGbl796le6XQKyxazsuiiu46rwE10xlWpl3DAbc6jpMR5UEQ5GnQiwDqRoPXhJ xdXs+FNoRuMzAMpeAw51+B6fIw2MA7TOlR6foJtKRmwDffNWApcE/h3l/gTBZeyVS4 yM54Zb4NF+XfVITMuOhKAe1uAsP+Xgxbaxpve1w/rcZKjLAOR2q5VKuOdb+HZy8wT7 cS1pIa0xiRI3LeoCEYaJKHd8nB7AaDyiL2UnuOnyVDC9w3zGEUMiVtvA+payODE0oF aUyj0vr6T0OMjkYz0wk1/mUbzrJ3C0Cmp5B//+Ur4I+NOlUH73KQXgxFVKGxaly0Tw Mv47bYzokYqLQ== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4gNv3P53smz6twQ; Mon, 25 May 2026 00:35:13 +0200 (CEST) From: Markus Probst Date: Sun, 24 May 2026 22:35:15 +0000 Subject: [PATCH v2 2/2] ACPI: SPCR: Support UART clock frequency field Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260525-acpi_spcr-v2-2-c042089d73ca@posteo.de> References: <20260525-acpi_spcr-v2-0-c042089d73ca@posteo.de> In-Reply-To: <20260525-acpi_spcr-v2-0-c042089d73ca@posteo.de> To: "Rafael J. Wysocki" , Len Brown , Geert Uytterhoeven , Thomas Bogendoerfer , Ard Biesheuvel , Ilias Apalodimas , Greg Kroah-Hartman , Jiri Slaby Cc: linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-efi@vger.kernel.org, linux-serial@vger.kernel.org, Markus Probst X-Developer-Signature: v=1; a=openpgp-sha256; l=994; i=markus.probst@posteo.de; h=from:subject:message-id; bh=r1UOA6QDMVbLt10TpU5riUnUKzso2VHkTZeHu02qA0E=; b=owEBiQJ2/ZANAwAIATR2H/jnrUPSAcsmYgBqE30d/Ky535kkEs+jKKn8OQQkNdVumjA0gDnkP gQRdkNXGcOJAk8EAAEIADkWIQSCdBjE9KxY53IwxHM0dh/4561D0gUCahN9HRsUgAAAAAAEAA5t YW51MiwyLjUrMS4xMiwyLDIACgkQNHYf+OetQ9LWgRAAvdrM4XZHCaojJl1n3pJlb87437N7Ysl cNkiSgsUT45gB6Eh9s+7sx02CKP4udH4Xd4oUHA1y4qPfoEsoaULCTmr7xhB9GxUQrxdjumhQpv 0P5dh8/m2fOEDanPTKIabSUOB8dwywtABfg8AoZMQLN1XMrwgh7HrFZqOVjYmwv0pcWzDY9KqkQ iZ7e3pW6P2ZNmo2KMbGAYVVSRUIn+u0+qx2r4opkHThg/UCLXQxyhPtudXlMLW0lMByUd9XlmVz fsnaNuro4fWVZiRiuqeEL5BJ7OmYiK/LjJchgX2WJZJUJDEwbSG99IDP+86735QCcLZtc0HRrs0 6jPy0YzCL6BznKvT30IvuK3o+cz036XXCa7dgfkPt5pUBD0Az/Q5vDCWnidSh9uYm0RM2p/yBAp WzEfolY0wxFGjJui5maHYcac91qgVEmJDJDH0iXltBe9VoTerHKmSUl+dU7fecJ1n/x+YWcFNRC aeTlXwnseN7mCc76bxLnc7IuJHf0BoWgb7b9Yw+C/+59u5qb7ejArucymV7sF8cJX6ZHixQjPSQ QS02GYsjcWWWsK5PeJISbt+Tceu5OiQ0lSVMntbLzlti6x3OfQ2qaLtAymEtMtMx57a+YNcRdWB fzBf1iHIImPl8CZ2ZX96MVW2VsWVsLR3RghguBCp1Bm0BGyDYODM= X-Developer-Key: i=markus.probst@posteo.de; a=openpgp; fpr=827418C4F4AC58E77230C47334761FF8E7AD43D2 Autocrypt: addr=markus.probst@posteo.de; prefer-encrypt=mutual; keydata=xsFNBGiDvXgBEADAXUceKafpl46S35UmDh2wRvvx+UfZbcTjeQOlSwKP7YVJ4JOZrVs93qReNLkO WguIqPBxR9blQ4nyYrqSCV+MMw/3ifyXIm6Pw2YRUDg+WTEOjTixRCoWDgUj1nOsvJ9tVAm76Ww+ /pAnepVRafMID0rqEfD9oGv1YrfpeFJhyE2zUw3SyyNLIKWD6QeLRhKQRbSnsXhGLFBXCqt9k5JA RhgQof9zvztcCVlT5KVvuyfC4H+HzeGmu9201BVyihJwKdcKPq+n/aY5FUVxNTgtI9f8wIbmfAja oT1pjXSp+dszakA98fhONM98pOq723o/1ZGMZukyXFfsDGtA3BB79HoopHKujLGWAGskzClwTjRQ xBqxh/U/lL1pc+0xPWikTNCmtziCOvv0KA0arDOMQlyFvImzX6oGVgE4ksKQYbMZ3Ikw6L1Rv1J+ FvN0aNwOKgL2ztBRYscUGcQvA0Zo1fGCAn/BLEJvQYShWKeKqjyncVGoXFsz2AcuFKe1pwETSsN6 OZncjy32e4ktgs07cWBfx0v62b8md36jau+B6RVnnodaA8++oXl3FRwiEW8XfXWIjy4umIv93tb8 8ekYsfOfWkTSewZYXGoqe4RtK80ulMHb/dh2FZQIFyRdN4HOmB4FYO5sEYFr9YjHLmDkrUgNodJC XCeMe4BO4iaxUQARAQABzRdtYXJrdXMucHJvYnN0QHBvc3Rlby5kZcLBkQQTAQgAOxYhBIJ0GMT0 rFjncjDEczR2H/jnrUPSBQJog714AhsDBQsJCAcCAiICBhUKCQgLAgQWAgMBAh4HAheAAAoJEDR2 H/jnrUPSgdkQAISaTk2D345ehXEkn5z2yUEjaVjHIE7ziqRaOgn/QanCgeTUinIv6L6QXUFvvIfH 1OLPwQ1hfvEg9NnNLyFezWSy6jvoVBTIPqicD/r3FkithnQ1IDkdSjrarPMxJkvuh3l7XZHo49GV HQ8i5zh5w4YISrcEtE99lJisvni2Jqx7we5tey9voQFDyM8jxlSWv3pmoUTCtBkX/eKHJXosgsuS B4TGDCVPOjla/emI5c9MhMG7O4WEEmoSdPbmraPw66YZD6uLyhV4DPHbiDWRzXWnClHSyjB9rky9 lausFxogvu4l9H+KDsXIadNDWdLdu1/enS/wDd9zh5S78rY2jeXaG4mnf4seEKamZ7KQ6FIHrcyP ezdDzssPQcTQcGRMQzCn6wP3tlGk7rsfmyHMlFqdRoNNv+ZER/OkmZFPW655zRfbMi0vtrqK2Awm 9ggobb1oktfd9PPNXMUY+DNVlgR2G7jLnenSoQausLUm0pHoNE8TWFv851Y6SOYnvn488sP1Tki5 F3rKwclawQFHUXTCQw+QSh9ay8xgnNZfH+u9NY7w3gPoeKBOAFcBc2BtzcgekeWS8qgEmm2/oNFV G0ivPQbRx8FjRKbuF7g3YhgNZZ0ac8FneuUtJ2PkSIFTZhaAiC0utvxk0ndmWFiW4acEkMZGrLaM L2zWNjrqwsD2zsFNBGiDvXgBEADCXQy1n7wjRxG12DOVADawjghKcG+5LtEf31WftHKLFbp/HArj BhkT6mj+CCI1ClqY+FYU5CK/s0ScMfLxRGLZ0Ktzawb78vOgBVFT3yB1yWBTewsAXdqNqRooaUNo 8cG/NNJLjhccH/7PO/FWX5qftOVUJ/AIsAhKQJ18Tc8Ik73v427EDxuKb9mTAnYQFA3Ev3hAiVbO 6Rv39amVOfJ8sqwiSUGidj2Fctg2aB5JbeMln0KCUbTD1LhEFepeKypfofAXQbGwaCjAhmkWy/q3 IT1mUrPxOngbxdRoOx1tGUC0HCMUW1sFaJgQPMmDcR0JGPOpgsKnitsSnN7ShcCr1buel7vLnUMD +TAZ5opdoF6HjAvAnBQaijtK6minkrM0seNXnCg0KkV8xhMNa6zCs1rq4GgjNLJue2EmuyHooHA4 7JMoLVHcxVeuNTp6K2+XRx0Pk4e2Lj8IVy9yEYyrywEOC5XRW37KJjsiOAsumi1rkvM7QREWgUDe Xs0+RpxI3QrrANh71fLMRo7LKRF3Gvw13NVCCC9ea20P4PwhgWKStkwO2NO+YJsAoS1QycMi/vKu 0EHhknYXamaSV50oZzHKmX56vEeJHTcngrM8R1SwJCYopCx9gkz90bTVYlitJa5hloWTYeMD7FNj Y6jfVSzgM/K4gMgUNDW/PPGeMwARAQABwsF2BBgBCAAgFiEEgnQYxPSsWOdyMMRzNHYf+OetQ9IF AmiDvXgCGwwACgkQNHYf+OetQ9LHDBAAhk+ab8+WrbS/b1/gYW3q1KDiXU719nCtfkUVXKidW5Ec Idlr5HGt8ilLoxSWT2Zi368iHCXS0WenGgPwlv8ifvB7TOZiiTDZROZkXjEBmU4nYjJ7GymawpWv oQwjMsPuq6ysbzWtOZ7eILx7cI0FjQeJ/Q2baRJub0uAZNwBOxCkAS6lpk5Fntd2u8CWmDQo4SYp xeuQ+pwkp0yEP30RhN2BO2DXiBEGSZSYh+ioGbCHQPIV3iVj0h6lcCPOqopZqyeCfigeacBI0nvN jHWz/spzF3+4OS+3RJvoHtAQmProxyGib8iVsTxgZO3UUi4TSODeEt0i0kHSPY4sCciOyXfAyYoD DFqhRjOEwBBxhr+scU4C1T2AflozvDwq3VSONjrKJUkhd8+WsdXxMdPFgBQuiKKwUy11mz6KQfcR wmDehF3UaUoxa+YIhWPbKmycxuX/D8SvnqavzAeAL1OcRbEI/HsoroVlEFbBRNBZLJUlnTPs8ZcU 4+8rq5YX1GUrJL3jf6SAfSgO7UdkEET3PdcKFYtS+ruV1Cp5V0q4kCfI5jk25iiz8grM2wOzVSsc l1mEkhiEPH87HP0whhb544iioSnumd3HJKL7dzhRegsMizatupp8D65A2JziW0WKopa1iw9fti3A aBeNN4ijKZchBXHPgVx+YtWRHfcm4l8= OpenPGP: url=https://posteo.de/keys/markus.probst@posteo.de.asc; preference=encrypt The Microsoft Serial Port Console Redirection (SPCR) specification revision 1.08 comprises additional field: UART Clock Frequency [1]. It contains a non-zero value indicating the UART clock frequency in Hz. Link: https://learn.microsoft.com/en-us/windows-hardware/drivers/serports/s= erial-port-console-redirection-table [1] Signed-off-by: Markus Probst --- drivers/acpi/spcr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/acpi/spcr.c b/drivers/acpi/spcr.c index cfacbe53f279..16f94073fde6 100644 --- a/drivers/acpi/spcr.c +++ b/drivers/acpi/spcr.c @@ -228,7 +228,7 @@ int __init acpi_parse_spcr(bool enable_earlycon, bool e= nable_console) pr_info("console: %s\n", opts); =20 if (enable_earlycon) - setup_earlycon(opts, 0); + setup_earlycon(opts, table->header.revision >=3D 3 ? table->uart_clk_fre= q : 0); =20 if (enable_console) err =3D add_preferred_console(uart, 0, opts + strlen(uart) + 1); --=20 2.53.0