From patchwork Mon Nov 11 03:37:00 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chuan Liu via B4 Relay X-Patchwork-Id: 13870216 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EBE4DD12D63 for ; Mon, 11 Nov 2024 03:44:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Reply-To:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To: Content-Transfer-Encoding:Content-Type:MIME-Version:Message-Id:Date:Subject: From:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=565wujJgAz7hJu1Dudmcm1fmu3cG7dfTZRLyfWZA5Po=; b=fpPuQRQUfN4fzG4ES83c8BbUx8 LFfjmq6mMAuAFS5zBUfuK31x7yPsLY5jQywIwG19pn7UyPMvpzqMMHpjThYq/D+zSkFSH5mBzK0SU Q8ES8pm2fzp+NzVAQq8ukjHLD6BoM6Lo+u5CVWLDOcGEDLq6JQS5a2kPMsyAEowHRt6zjMGdbs+10 /AIFlsfmjzdStNN3GBa/khyELlWSG/jfTI3EGMppjCulGSLQTlt6mieQncrJV7PscCECX17clRT9w sDhx2Nz4SHsPsPD7RBQjpZ2ODEdI6pCU+nItwYUrnMZYmN+/jR+S0EnrXsc2O1CmsCeRE/IrK1vb4 E/BHssGQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tALLm-0000000GFJm-3VGy; Mon, 11 Nov 2024 03:44:26 +0000 Received: from nyc.source.kernel.org ([147.75.193.91]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tALEl-0000000GEYM-3mzt; Mon, 11 Nov 2024 03:37:14 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id A369AA40DBF; Mon, 11 Nov 2024 03:35:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPS id AACF0C4CECD; Mon, 11 Nov 2024 03:37:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1731296229; bh=g6bebViV2vgswvScFFgT4ihiXpYioBTgIRcyCJ4wOg0=; h=From:Subject:Date:To:Cc:Reply-To:From; b=lAEK7ZDGnUWWeuGgGHoSBZSIch//gY4F4iZv+vqgfDMvl4H2cXdo1ktf7PTJalbhK OqPDqc7hZoV+ypChfdcdFWFRgOPUIW2OpBGKmVf4wL3KfMT3qfqkNprFjUWHwoIxoi 8w/5kxlytyCl8AA9bqTbC2JO45bqunfJLZ+sUBno9FnWb1bSNpLoZtxRt8K0RJ1/Du +doveSPWZ5KWISLC+6CjI6csMkXFnJIOvQoV3YM4yZO6ONSsB0Xv5t6oYDrQ/GvldD bbSPZsyRjIElY3luIiIy0FHF0x/5R6H5fTHmpj9NbXxSw6TcPnFCIn5FGCDtlu2Lbi QjecLV+Ifsb0Q== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id A09F0D12D49; Mon, 11 Nov 2024 03:37:09 +0000 (UTC) From: Chuan Liu via B4 Relay Subject: [PATCH v2 0/3] clk: Fix issues related to CLK_IGNORE_UNUSED failures and amlogic glitch free mux Date: Mon, 11 Nov 2024 11:37:00 +0800 Message-Id: <20241111-fix_glitch_free-v2-0-0099fd9ad3e5@amlogic.com> MIME-Version: 1.0 X-B4-Tracking: v=1; b=H4sIANx7MWcC/3WNwQqDMBBEf0X23JS4ltb01P8oInbdJAtqJBFpE f+9qfce3zDzZoPEUTjBvdgg8ipJwpQBTwWQ7ybHSvrMgBov2qBRVt6tG2Qh39rIrNBoqmuDFVU l5NUcOVcO47PJ7CUtIX6Og7X8pf9da6m0QrSGquvrxr19dOMQnNCZwgjNvu9f+2eoY7AAAAA= To: Michael Turquette , Stephen Boyd , Neil Armstrong , Jerome Brunet , Kevin Hilman , Martin Blumenstingl Cc: linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Chuan Liu X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=ed25519-sha256; t=1731296227; l=2635; i=chuan.liu@amlogic.com; s=20240902; h=from:subject:message-id; bh=g6bebViV2vgswvScFFgT4ihiXpYioBTgIRcyCJ4wOg0=; b=5sClNyptQe3+bagbINnhGgZawIIkUqgm0F9mH6dWCZh1WqRUKdk8EPEuNykuNhlrS8kgQYefe +FPz2kz/kQND05wRTL8OF9cTnv6S6R+ApC+whsKI9TACfH4LDcdITbt X-Developer-Key: i=chuan.liu@amlogic.com; a=ed25519; pk=fnKDB+81SoWGKW2GJNFkKy/ULvsDmJZRGBE7pR5Xcpo= X-Endpoint-Received: by B4 Relay for chuan.liu@amlogic.com/20240902 with auth_id=203 X-Original-From: Chuan Liu X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241110_193712_109349_2539D9C1 X-CRM114-Status: GOOD ( 10.60 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: chuan.liu@amlogic.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org If CLK_OPS_PARENT_ENABLE is configured for clock, clk_core_disable_unprepare() is called in clk_disable_unused_subtree(). Even clocks that are configured with CLK_IGNORE_UNUSED are disabled, resulting in the failure of CLK_IGNORE_UNUSED. To ensure that amlogic glitch free mux can switch clock channels properly, add flag CLK_OPS_PARENT_ENABLE to glitch free mux. The issue that CLK_OPS_PARENT_ENABLE in CCF causes CLK_IGNORE_UNUSED to fail is also exposed. glitch free mux channel switchover failure issue(Test vpu_clk on S4): step 1: $ cat /sys/kernel/debug/clk/vpu/clk_parent vpu_0 $ cat /sys/kernel/debug/clk/vpu_0/clk_rate 399999994 $ cat /sys/kernel/debug/clk/vpu_1/clk_rate 666666656 $ echo 1 > /sys/kernel/debug/clk/vpu/clk_prepare_enable $ cat /sys/kernel/debug/meson-clk-msr/clks/cts_vpu_clk 399987500 +/-12500Hz step 2: $ echo 0 > /sys/kernel/debug/clk/vpu/clk_prepare_enable $ echo 1 > /sys/kernel/debug/clk/vpu/clk_parent $ cat /sys/kernel/debug/clk/vpu/clk_parent vpu_1 $ cat /sys/kernel/debug/clk/vpu/clk_rate 666666656 $ echo 1 > /sys/kernel/debug/clk/vpu/clk_prepare_enable $ cat /sys/kernel/debug/meson-clk-msr/clks/cts_vpu_clk 0 +/-3125Hz In step2, vpu_0 is disabled, and the vpu is not switched to vpu_1. At this time, the vpu is still connected to vpu_0 and vpu_0 is disabled at this time, resulting in the clk-measure not measuring the clock. Signed-off-by: Chuan Liu --- Changes in v2: - The failure of glitch-free mux switching and the suppression of glitch are split into two patch. - The glitch-free mux adds support for the meson-8 family. - Link to v1: https://lore.kernel.org/r/20240929-fix_glitch_free-v1-0-22f9c36b7edf@amlogic.com --- Chuan Liu (3): clk: Fix the CLK_IGNORE_UNUSED failure issue clk: meson: Fix failure of glitch-free mux switching clk: meson: Fix glitch occurs when setting up glitch-free mux drivers/clk/clk.c | 67 ++++++++++++++++++++++++++++++++++++-- drivers/clk/meson/a1-peripherals.c | 12 +++---- drivers/clk/meson/axg.c | 16 +++++---- drivers/clk/meson/c3-peripherals.c | 6 ++-- drivers/clk/meson/g12a.c | 18 ++++++---- drivers/clk/meson/gxbb.c | 18 ++++++---- drivers/clk/meson/meson8b.c | 21 ++++++++++-- drivers/clk/meson/s4-peripherals.c | 32 +++++++++--------- 8 files changed, 140 insertions(+), 50 deletions(-) --- base-commit: 664988eb47dd2d6ae1d9e4188ec91832562f8f26 change-id: 20240929-fix_glitch_free-290c88923c31 Best regards,