From patchwork Mon Oct 5 15:26:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 290592 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 774ABC4363A for ; Mon, 5 Oct 2020 15:42:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2FE6720639 for ; Mon, 5 Oct 2020 15:42:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1601912568; bh=NrKc5DNrLx2N14nauEAjIZc84Xq2ivLigbx37iLeGkA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=atIh6L4gDg9kuc1qBlsp3PPRsvVabzpl5Zb6XfAqPVSkEzbx85IrCmCp+r1rf2h44 8x4Te11as37CDhZRpj7JhCXL3OEuynKcDpWyBC4XpiYs5A1nSfB5Y4C1Ee4jJR5n+/ Lgj9VcThp7eqEKmOOHk33IEqajLjWztZRSeJfuaA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727243AbgJEP1i (ORCPT ); Mon, 5 Oct 2020 11:27:38 -0400 Received: from mail.kernel.org ([198.145.29.99]:52204 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727131AbgJEP1f (ORCPT ); Mon, 5 Oct 2020 11:27:35 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 505B720874; Mon, 5 Oct 2020 15:27:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1601911653; bh=NrKc5DNrLx2N14nauEAjIZc84Xq2ivLigbx37iLeGkA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AhBSZOWhIGSVN+p9WSC2qx/NYLeXel8x9N/h98LAZ4EpaNmEZrNK8VhYXrz7HDXS/ UIXGHLLS+bsNfWOl/TI/wzZW0EVbVSyWdRamnMlFb+ln9/LSloAPWbX3u++GWCkC64 tvV9ufbsq/+p0LATKSq/0LqMCYSUF/Df6EGCq+Qk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Marek Szyprowski , Krzysztof Kozlowski , Sylwester Nawrocki , Stephen Boyd , Sasha Levin Subject: [PATCH 4.19 26/38] clk: samsung: exynos4: mark chipid clock as CLK_IGNORE_UNUSED Date: Mon, 5 Oct 2020 17:26:43 +0200 Message-Id: <20201005142109.933241330@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201005142108.650363140@linuxfoundation.org> References: <20201005142108.650363140@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Marek Szyprowski [ Upstream commit f3bb0f796f5ffe32f0fbdce5b1b12eb85511158f ] The ChipID IO region has it's own clock, which is being disabled while scanning for unused clocks. It turned out that some CPU hotplug, CPU idle or even SOC firmware code depends on the reads from that area. Fix the mysterious hang caused by entering deep CPU idle state by ignoring the 'chipid' clock during unused clocks scan, as there are no direct clients for it which will keep it enabled. Fixes: e062b571777f ("clk: exynos4: register clocks using common clock framework") Signed-off-by: Marek Szyprowski Link: https://lore.kernel.org/r/20200922124046.10496-1-m.szyprowski@samsung.com Reviewed-by: Krzysztof Kozlowski Acked-by: Sylwester Nawrocki Signed-off-by: Stephen Boyd Signed-off-by: Sasha Levin --- drivers/clk/samsung/clk-exynos4.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/clk/samsung/clk-exynos4.c b/drivers/clk/samsung/clk-exynos4.c index 442309b569203..8086756e7f076 100644 --- a/drivers/clk/samsung/clk-exynos4.c +++ b/drivers/clk/samsung/clk-exynos4.c @@ -1072,7 +1072,7 @@ static const struct samsung_gate_clock exynos4210_gate_clks[] __initconst = { GATE(CLK_PCIE, "pcie", "aclk133", GATE_IP_FSYS, 14, 0, 0), GATE(CLK_SMMU_PCIE, "smmu_pcie", "aclk133", GATE_IP_FSYS, 18, 0, 0), GATE(CLK_MODEMIF, "modemif", "aclk100", GATE_IP_PERIL, 28, 0, 0), - GATE(CLK_CHIPID, "chipid", "aclk100", E4210_GATE_IP_PERIR, 0, 0, 0), + GATE(CLK_CHIPID, "chipid", "aclk100", E4210_GATE_IP_PERIR, 0, CLK_IGNORE_UNUSED, 0), GATE(CLK_SYSREG, "sysreg", "aclk100", E4210_GATE_IP_PERIR, 0, CLK_IGNORE_UNUSED, 0), GATE(CLK_HDMI_CEC, "hdmi_cec", "aclk100", E4210_GATE_IP_PERIR, 11, 0, @@ -1113,7 +1113,7 @@ static const struct samsung_gate_clock exynos4x12_gate_clks[] __initconst = { 0), GATE(CLK_TSADC, "tsadc", "aclk133", E4X12_GATE_BUS_FSYS1, 16, 0, 0), GATE(CLK_MIPI_HSI, "mipi_hsi", "aclk133", GATE_IP_FSYS, 10, 0, 0), - GATE(CLK_CHIPID, "chipid", "aclk100", E4X12_GATE_IP_PERIR, 0, 0, 0), + GATE(CLK_CHIPID, "chipid", "aclk100", E4X12_GATE_IP_PERIR, 0, CLK_IGNORE_UNUSED, 0), GATE(CLK_SYSREG, "sysreg", "aclk100", E4X12_GATE_IP_PERIR, 1, CLK_IGNORE_UNUSED, 0), GATE(CLK_HDMI_CEC, "hdmi_cec", "aclk100", E4X12_GATE_IP_PERIR, 11, 0,