From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F14BECDB465 for ; Mon, 16 Oct 2023 08:55:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231803AbjJPIzd (ORCPT ); Mon, 16 Oct 2023 04:55:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49382 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233110AbjJPIzc (ORCPT ); Mon, 16 Oct 2023 04:55:32 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A65A8F2 for ; Mon, 16 Oct 2023 01:55:29 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3A0A3C433C7; Mon, 16 Oct 2023 08:55:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1697446529; bh=hQ3Hik0hClGfYzKvYtJolF4ZUB5bQYj9aBBumITfZRs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=u9f26amho/Ri9Q7dTkRY4zo6jmbf2+Qjkgvi6guj/jdn/zOLIApCnfXqATNx74J+W +00K5Scmyyr6xSVkUJeluPqAp4nBdqBEwCWeMX9zXe6czJEKYoY0Kehv/7lSx0vzkd 7bDK09vriPDE/hXKL4+y8x3am36lbyfNcGyN7qio= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, "=?UTF-8?q?N=C3=ADcolas=20F . =20R . =20A . =20Prado?=" , AngeloGioacchino Del Regno , Arnd Bergmann , Sasha Levin Subject: [PATCH 6.1 045/131] arm64: dts: mediatek: mt8195: Set DSU PMU status to fail Date: Mon, 16 Oct 2023 10:40:28 +0200 Message-ID: <20231016084001.193039571@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231016084000.050926073@linuxfoundation.org> References: <20231016084000.050926073@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Nícolas F. R. A. Prado [ Upstream commit d192615c307ec9f74cd0582880ece698533eb99b ] The DSU PMU allows monitoring performance events in the DSU cluster, which is done by configuring and reading back values from the DSU PMU system registers. However, for write-access to be allowed by ELs lower than EL3, the EL3 firmware needs to update the setting on the ACTLR3_EL3 register, as it is disallowed by default. That configuration is not done on the firmware used by the MT8195 SoC, as a consequence, booting a MT8195-based machine like mt8195-cherry-tomato-r2 with CONFIG_ARM_DSU_PMU enabled hangs the kernel just as it writes to the CLUSTERPMOVSCLR_EL1 register, since the instruction faults to EL3, and BL31 apparently just re-runs the instruction over and over. Mark the DSU PMU node in the Devicetree with status "fail", as the machine doesn't have a suitable firmware to make use of it from the kernel, and allowing its driver to probe would hang the kernel. Fixes: 37f2582883be ("arm64: dts: Add mediatek SoC mt8195 and evaluation board") Signed-off-by: Nícolas F. R. A. Prado Reviewed-by: AngeloGioacchino Del Regno Signed-off-by: AngeloGioacchino Del Regno Link: https://lore.kernel.org/r/20230720200753.322133-1-nfraprado@collabora.com Link: https://lore.kernel.org/r/20231003-mediatek-fixes-v6-7-v1-5-dad7cd62a8ff@collabora.com Signed-off-by: Arnd Bergmann Signed-off-by: Sasha Levin --- arch/arm64/boot/dts/mediatek/mt8195.dtsi | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/boot/dts/mediatek/mt8195.dtsi b/arch/arm64/boot/dts/mediatek/mt8195.dtsi index 2c2b946b614bf..ef2764a595eda 100644 --- a/arch/arm64/boot/dts/mediatek/mt8195.dtsi +++ b/arch/arm64/boot/dts/mediatek/mt8195.dtsi @@ -229,6 +229,7 @@ dsu-pmu { interrupts = ; cpus = <&cpu0>, <&cpu1>, <&cpu2>, <&cpu3>, <&cpu4>, <&cpu5>, <&cpu6>, <&cpu7>; + status = "fail"; }; dmic_codec: dmic-codec { -- 2.40.1