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 X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 79133C3A5A6 for ; Sun, 22 Sep 2019 19:12:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4A281206C2 for ; Sun, 22 Sep 2019 19:12:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569179572; bh=nyBBVxg56+WBbZRAr6q8/BdvcmxX1/Rphjj2hQEMees=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=adqQrsDmA/6ChaDkTr4qLD4p6PvvEwt/hwJ1zgwZIo/QAN4fBzY5GShQLNjckWlzU GV0rfYA+6AbBBwcKPzbEqfIa0+RwRshGjdEZsWc1QouQwXN/wGgb2OL2ny2X5BX86b xyaAbIs+4Pz0F9UYUdmNMD92DW/tuknh9DI8r+T0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730656AbfIVTMv (ORCPT ); Sun, 22 Sep 2019 15:12:51 -0400 Received: from mail.kernel.org ([198.145.29.99]:60542 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2438677AbfIVS5y (ORCPT ); Sun, 22 Sep 2019 14:57:54 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 01BB12190F; Sun, 22 Sep 2019 18:57:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569178673; bh=nyBBVxg56+WBbZRAr6q8/BdvcmxX1/Rphjj2hQEMees=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=klX9sMY74bCnMhZZiST0sEL9LPNEd3or/l0ImT4BzmqXS0ndS4sgzgE7AQpth7YMg 8uz5di1xJNf84qqj6OFVXtx+UpCF0UiaR7ynv4V6C5kKdFm6UURjdhKphs3un6V3Li Cu+UnIoEv/ZwVUlv+nVZv5olVdGnMFJmeYKG6Vqw= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Kuninori Morimoto , Leon Kong , Mark Brown , Sasha Levin Subject: [PATCH AUTOSEL 4.14 23/89] ASoC: rsnd: don't call clk_get_rate() under atomic context Date: Sun, 22 Sep 2019 14:56:11 -0400 Message-Id: <20190922185717.3412-23-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190922185717.3412-1-sashal@kernel.org> References: <20190922185717.3412-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Kuninori Morimoto [ Upstream commit 06e8f5c842f2dbb232897ba967ea7b422745c271 ] ADG is using clk_get_rate() under atomic context, thus, we might have scheduling issue. To avoid this issue, we need to get/keep clk rate under non atomic context. We need to handle ADG as special device at Renesas Sound driver. >From SW point of view, we want to impletent it as rsnd_mod_ops :: prepare, but it makes code just complicate. To avoid complicated code/patch, this patch adds new clk_rate[] array, and keep clk IN rate when rsnd_adg_clk_enable() was called. Reported-by: Leon Kong Signed-off-by: Kuninori Morimoto Tested-by: Leon Kong Link: https://lore.kernel.org/r/87v9vb0xkp.wl-kuninori.morimoto.gx@renesas.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- sound/soc/sh/rcar/adg.c | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) diff --git a/sound/soc/sh/rcar/adg.c b/sound/soc/sh/rcar/adg.c index eb7879bcc6a79..686401bcd1f53 100644 --- a/sound/soc/sh/rcar/adg.c +++ b/sound/soc/sh/rcar/adg.c @@ -33,6 +33,7 @@ struct rsnd_adg { struct clk *clkout[CLKOUTMAX]; struct clk_onecell_data onecell; struct rsnd_mod mod; + int clk_rate[CLKMAX]; u32 flags; u32 ckr; u32 rbga; @@ -110,9 +111,9 @@ static void __rsnd_adg_get_timesel_ratio(struct rsnd_priv *priv, unsigned int val, en; unsigned int min, diff; unsigned int sel_rate[] = { - clk_get_rate(adg->clk[CLKA]), /* 0000: CLKA */ - clk_get_rate(adg->clk[CLKB]), /* 0001: CLKB */ - clk_get_rate(adg->clk[CLKC]), /* 0010: CLKC */ + adg->clk_rate[CLKA], /* 0000: CLKA */ + adg->clk_rate[CLKB], /* 0001: CLKB */ + adg->clk_rate[CLKC], /* 0010: CLKC */ adg->rbga_rate_for_441khz, /* 0011: RBGA */ adg->rbgb_rate_for_48khz, /* 0100: RBGB */ }; @@ -328,7 +329,7 @@ int rsnd_adg_clk_query(struct rsnd_priv *priv, unsigned int rate) * AUDIO_CLKA/AUDIO_CLKB/AUDIO_CLKC/AUDIO_CLKI. */ for_each_rsnd_clk(clk, adg, i) { - if (rate == clk_get_rate(clk)) + if (rate == adg->clk_rate[i]) return sel_table[i]; } @@ -394,10 +395,18 @@ void rsnd_adg_clk_control(struct rsnd_priv *priv, int enable) for_each_rsnd_clk(clk, adg, i) { ret = 0; - if (enable) + if (enable) { ret = clk_prepare_enable(clk); - else + + /* + * We shouldn't use clk_get_rate() under + * atomic context. Let's keep it when + * rsnd_adg_clk_enable() was called + */ + adg->clk_rate[i] = clk_get_rate(adg->clk[i]); + } else { clk_disable_unprepare(clk); + } if (ret < 0) dev_warn(dev, "can't use clk %d\n", i); -- 2.20.1