From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mout01.posteo.de (mout01.posteo.de [185.67.36.65]) (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 38AE43B47CC for ; Mon, 8 Jun 2026 22:40:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.67.36.65 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780958431; cv=none; b=CrTe2EjQC/L81zPEQOStY2F6JQ3VP4gJ8ybOjc8JBRbbZcvI6jGCY8NJ6txJUkfxhe9xlTa9QfRUnYK97jbfSz7nmCHadyBZnRudO6Npe9IMPJ7hm7wNml7G8j3iUTWFh9aFRRH6OhEvlphXweBphBzuYQudcn51UarJQzaIGgw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780958431; c=relaxed/simple; bh=r1UOA6QDMVbLt10TpU5riUnUKzso2VHkTZeHu02qA0E=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=o9bDPB/n2rjEhdl1CYKxonVjOm4P3UD9PeydZhNwigbBJ+OGQF146A9k8mtasCfDLobhes+xtrT+FKhs8SG7bSU0nnlrEveNWmbrI88n8UDf61br1xjDF8ugz1gYiNUOcDncZ63eEEryfPRD7EewKzxB9hVO2R+hkSYf3cJj0hA= 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=F3kaJ++X; arc=none smtp.client-ip=185.67.36.65 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="F3kaJ++X" Received: from submission (posteo.de [185.67.36.169]) by mout01.posteo.de (Postfix) with ESMTPS id 9C5AF240027 for ; Tue, 9 Jun 2026 00:40:23 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=posteo.de; s=2017; t=1780958423; bh=21o/xwwmDVfuFXFMoGsY/mGvvY5gAZ5X0zqmGuYe3QU=; h=From:Date:Subject:MIME-Version:Content-Type: Content-Transfer-Encoding:Message-Id:To:Cc:Autocrypt:OpenPGP:From; b=F3kaJ++XJ3Z/wO8LrsqYHiFY02PcURGmv0OsP1bs4KqfYwQR0ANJ7QAumg5b5SR0J Y75Qj6pCx2ItT3l877DadM5ugCJzysVoKkLUVV4Kawtox5RG3LyRdCtKjnDUiSxAqb /ziycv9VvLd49bF2k2HUC/zazs6S2cPNJvc/vSyJUz1i8NDdGYUM66pkQc6W9HweTk djyRhYFn66b1JrjsqRffzGlTJjNKHxM7ChL1s6ErTZW5mUnTubb2WqG62dOkB09V49 QOWea3yudSvYqRxaFoJ4lflJxdONHr9ytgY4X3HJ1DWkxTlN/xUIj/ztXnjIAoK+HV CxgOQxLIwe2Cw== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4gZ6SP2Ngkz6tyc; Tue, 9 Jun 2026 00:40:21 +0200 (CEST) From: Markus Probst Date: Mon, 08 Jun 2026 22:40:22 +0000 Subject: [PATCH RESEND v2 2/2] ACPI: SPCR: Support UART clock frequency field Precedence: bulk X-Mailing-List: linux-m68k@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260609-acpi_spcr-v2-2-3cd9a3bda727@posteo.de> References: <20260609-acpi_spcr-v2-0-3cd9a3bda727@posteo.de> In-Reply-To: <20260609-acpi_spcr-v2-0-3cd9a3bda727@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/jnrUPSAcsmYgBqJ0TRxNIQZSfEXZRNLWK35PMyBmlqEuLt1D3II anTYC2Y8tOJAk8EAAEIADkWIQSCdBjE9KxY53IwxHM0dh/4561D0gUCaidE0RsUgAAAAAAEAA5t YW51MiwyLjUrMS4xMiwyLDIACgkQNHYf+OetQ9LgzQ//QREw0+754Nn9BQNWibuhrhWZFYTxOGY FxTQVSEaw7B9NtX2pmML6nywzUy3Uiv7aI3JORIbFzAk7Vx7x8oFhSvwdNxgQyEMDrcz2u1XmKP feZT/ZV0b/shqNUjeZ3dcKh5NZsqgqclAs3H0+7JhESFnkRLVjTF6WxWY2c1l63sjFJAeACBfxa eqg0Vf7trrjQBh5X0dPKJASmqWOXOS3U8nIiQUJCmUj9W3jWuZU1sHO/QywJf0ccbVyusE2sRIX XDZuvu3m+uhZaqsMzfApYxuVuM4yEHqB8H7Eok5pTWMlRNQOKE4/Q9VbuwrIUA8/owMGzmoNk/X PYxeOoAjJDxsIH7BtmbcafX4oXFl0+zcZ7chwgLNQapDoimxo/sFo2MtesnNUeD6wp7emrDC+N+ LZOcpo1qjHvFbK0VLpMKEao6skhAEEqz+5eZRmFZufDXAPBN0QNgbaC5DRa93v/qpmIaKszcFh9 nsQ4xSs7/Ky4LxuIAGqCSH/hiBBsHpgOi3k7Xo7wMXzZmbn3ByWqaLWpjKGGky3WcaU5fxPX+sc waVGVn7GK33Ms+pquSjjMcyZcAUqVPdJWb2/bX4jXmoebmoi4y3Uofcr1cfd3+LyeK18p0OZ0W9 kVo2aysaDqhxeyv2QdPI9phGzoJbTPJnSbDcrMHA0tblPZcoSlwU= 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/serial-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 enable_console) pr_info("console: %s\n", opts); if (enable_earlycon) - setup_earlycon(opts, 0); + setup_earlycon(opts, table->header.revision >= 3 ? table->uart_clk_freq : 0); if (enable_console) err = add_preferred_console(uart, 0, opts + strlen(uart) + 1); -- 2.53.0