From nobody Mon Feb 9 03:45:49 2026 Received: from mailgw02.mediatek.com (unknown [210.61.82.184]) (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 65EC32FB616; Mon, 2 Feb 2026 06:28:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=210.61.82.184 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770013740; cv=none; b=haspqMU46H2x4CMNL0v9H9W3ApuHhnaP9Qe+CvIuyFwH3RNK0aKarYcZsybj2NGPXWvnrWm3mQYBA3zCFXYraXZF5WmuV01DVTtmgPQ3Hn0624ixM1L2R6UYbo9LZRjnFj7U2AClRKVYN7GvbAZVEQUzDtqqo53C/dkEQDR/tMo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770013740; c=relaxed/simple; bh=DrsYZkiQamWiz0bhf8SHSyd7Rqn5xahi9uYwbgRuYzA=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=CBEE68VsSdhtKWpmGHRmTr5PEskC/K14Ok0DX+CDPbSBR8ZNy5HpEdQjkaVKtx8vD88EGw1J6CH+trZiOGcHPpFTjrT5YmkyAChx9JnUMGC710m8r8InbQDrnyYdQMfnEOebZ1fqnmL561V6xPW6kdlNbz9Sr2ZDuNFDwTYFkwc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=mediatek.com; spf=pass smtp.mailfrom=mediatek.com; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b=TfoXyk/7; arc=none smtp.client-ip=210.61.82.184 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=mediatek.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mediatek.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b="TfoXyk/7" X-UUID: 6c8868e6000011f1b7fc4fdb8733b2bc-20260202 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=5VqqEAsneNFYY8k+GNal8ibP1/hmLNkCH05sJ3ZMoVw=; b=TfoXyk/7t4RXz9FWCqi+s6i30rT/zO9zTNxtgfszirpxqW52Jgofruh5MYtk+FChxw8Sl+d7R/PhSwpoYGrhYe9hZr8giQHbVHm10NoJ82uokXf8FXidLvw+GfJPdvivz+ZegoU9z85O20gvPTVp7rySoZhg5XNybqxiC3iTSKc=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.11,REQID:f675c0bf-cb6f-48f1-a8aa-bc73b3362e53,IP:0,U RL:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION: release,TS:0 X-CID-META: VersionHash:89c9d04,CLOUDID:cc6734e9-ef90-4382-9c6f-55f2a0689a6b,B ulkID:nil,BulkQuantity:0,Recheck:0,SF:81|82|102|836|888|898,TC:-5,Content: 0|15|50,EDM:-3,IP:nil,URL:0,File:130,RT:0,Bulk:nil,QS:nil,BEC:-1,COL:0,OSI :0,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,ARC:0 X-CID-BVR: 2,SSN|SDN X-CID-BAS: 2,SSN|SDN,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: 6c8868e6000011f1b7fc4fdb8733b2bc-20260202 Received: from mtkmbs10n2.mediatek.inc [(172.21.101.183)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 1527920586; Mon, 02 Feb 2026 14:28:44 +0800 Received: from mtkmbs13n2.mediatek.inc (172.21.101.108) by mtkmbs10n2.mediatek.inc (172.21.101.183) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.29; Mon, 2 Feb 2026 14:28:43 +0800 Received: from mtksitap99.mediatek.inc (10.233.130.16) by mtkmbs13n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.2562.29 via Frontend Transport; Mon, 2 Feb 2026 14:28:43 +0800 From: irving.ch.lin To: Michael Turquette , Stephen Boyd , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Matthias Brugger , AngeloGioacchino Del Regno , Richard Cochran , Bartosz Golaszewski , "Chen-Yu Tsai" , Miles Chen CC: , , , , , , , Qiqi Wang , , , , Subject: [PATCH v5 02/18] clk: mediatek: clk-mux: Make sure bypass clk enabled while setting MFG rate Date: Mon, 2 Feb 2026 14:28:09 +0800 Message-ID: <20260202062840.342707-3-irving-ch.lin@mediatek.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20260202062840.342707-1-irving-ch.lin@mediatek.com> References: <20260202062840.342707-1-irving-ch.lin@mediatek.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Irving-CH Lin Enable bypass clock before MFG changing rate, to make sure MFG reference clock available during transient. Fixes: b66add7a74e8 ("clk: mediatek: mux: add clk notifier functions") Signed-off-by: Irving-CH Lin --- drivers/clk/mediatek/clk-mux.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/clk/mediatek/clk-mux.c b/drivers/clk/mediatek/clk-mux.c index c5af6dc078a3..07f1f18b38bc 100644 --- a/drivers/clk/mediatek/clk-mux.c +++ b/drivers/clk/mediatek/clk-mux.c @@ -414,16 +414,21 @@ static int mtk_clk_mux_notifier_cb(struct notifier_bl= ock *nb, struct clk_notifier_data *data =3D _data; struct clk_hw *hw =3D __clk_get_hw(data->clk); struct mtk_mux_nb *mux_nb =3D to_mtk_mux_nb(nb); + struct clk_hw *p_hw =3D clk_hw_get_parent_by_index(hw, mux_nb->bypass_ind= ex); int ret =3D 0; =20 switch (event) { case PRE_RATE_CHANGE: - mux_nb->original_index =3D mux_nb->ops->get_parent(hw); - ret =3D mux_nb->ops->set_parent(hw, mux_nb->bypass_index); + ret =3D clk_prepare_enable(p_hw->clk); + if (ret =3D=3D 0) { + mux_nb->original_index =3D mux_nb->ops->get_parent(hw); + ret =3D mux_nb->ops->set_parent(hw, mux_nb->bypass_index); + } break; case POST_RATE_CHANGE: case ABORT_RATE_CHANGE: ret =3D mux_nb->ops->set_parent(hw, mux_nb->original_index); + clk_disable_unprepare(p_hw->clk); break; } =20 --=20 2.45.2