From patchwork Thu Oct 4 20:38:16 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andreas Kemnade X-Patchwork-Id: 10626683 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4173F174A for ; Thu, 4 Oct 2018 20:38:52 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 357D1296EF for ; Thu, 4 Oct 2018 20:38:52 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 293DD296FB; Thu, 4 Oct 2018 20:38:52 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CC55B296EF for ; Thu, 4 Oct 2018 20:38:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727638AbeJEDd3 (ORCPT ); Thu, 4 Oct 2018 23:33:29 -0400 Received: from mail.andi.de1.cc ([85.214.239.24]:33926 "EHLO h2641619.stratoserver.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727354AbeJEDd3 (ORCPT ); Thu, 4 Oct 2018 23:33:29 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=kemnade.info; s=20180802; h=References:In-Reply-To:Message-Id:Date:Subject: Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=hxKaBbQP9Ohf6unfmS5C4E5JDsTkQe6IxUA7qgDVBQc=; b=AU1VWG6c6U0Tcj29nA5TnaB9i yf4HzBgo0h+2bKYXNSnhpf3lj0a4NtcoVGVBrXWLH8DxemA4oiPT7q6XF0laRSRMGb1kzKABT2+Cs wtSGEbhs1MhP7951I3K/trG7ArKgYwTwPOrx0xCH/q3WxJPjzObu7tT1f2JRQWgWU6ZMc=; Received: from p200300ccfbcbd5001a3da2fffebfd33a.dip0.t-ipconnect.de ([2003:cc:fbcb:d500:1a3d:a2ff:febf:d33a] helo=aktux) by h2641619.stratoserver.net with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1g8AOA-0007GZ-C4; Thu, 04 Oct 2018 22:38:26 +0200 Received: from andi by aktux with local (Exim 4.89) (envelope-from ) id 1g8AOA-0005mB-1h; Thu, 04 Oct 2018 22:38:26 +0200 From: Andreas Kemnade To: t-kristo@ti.com, mturquette@baylibre.com, sboyd@kernel.org, linux-omap@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, bcousson@baylibre.com, paul@pwsan.com, tony@atomide.com, letux-kernel@openphoenux.org Cc: Andreas Kemnade Subject: [PATCH 1/2] clk: ti: add a usecount for autoidle Date: Thu, 4 Oct 2018 22:38:16 +0200 Message-Id: <20181004203817.22101-2-andreas@kemnade.info> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20181004203817.22101-1-andreas@kemnade.info> References: <20181004203817.22101-1-andreas@kemnade.info> Sender: linux-clk-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP We have the scenario that first autoidle is disabled for all clocks, then it is disabled for selected ones and then enabled for all. So we should have some counting here, also according to the comment in _setup_iclk_autoidle() Signed-off-by: Andreas Kemnade --- drivers/clk/ti/autoidle.c | 32 ++++++++++++++++++++++++-------- include/linux/clk/ti.h | 1 + 2 files changed, 25 insertions(+), 8 deletions(-) diff --git a/drivers/clk/ti/autoidle.c b/drivers/clk/ti/autoidle.c index 7bb9afbe4058..bb6cff168e73 100644 --- a/drivers/clk/ti/autoidle.c +++ b/drivers/clk/ti/autoidle.c @@ -37,6 +37,14 @@ struct clk_ti_autoidle { static LIST_HEAD(autoidle_clks); static LIST_HEAD(clk_hw_omap_clocks); +/* + * we have some non-atomic read/write + * operations behind it, so lets + * take one mutex for handling autoidle + * of all clocks + */ +static DEFINE_MUTEX(autoidle_mutex); + /** * omap2_clk_deny_idle - disable autoidle on an OMAP clock * @clk: struct clk * to disable autoidle for @@ -48,8 +56,13 @@ int omap2_clk_deny_idle(struct clk *clk) struct clk_hw_omap *c; c = to_clk_hw_omap(__clk_get_hw(clk)); - if (c->ops && c->ops->deny_idle) - c->ops->deny_idle(c); + if (c->ops && c->ops->deny_idle) { + mutex_lock(&autoidle_mutex); + c->autoidle_count--; + if (c->autoidle_count == -1) + c->ops->deny_idle(c); + mutex_unlock(&autoidle_mutex); + } return 0; } @@ -64,8 +77,13 @@ int omap2_clk_allow_idle(struct clk *clk) struct clk_hw_omap *c; c = to_clk_hw_omap(__clk_get_hw(clk)); - if (c->ops && c->ops->allow_idle) - c->ops->allow_idle(c); + if (c->ops && c->ops->allow_idle) { + mutex_lock(&autoidle_mutex); + c->autoidle_count++; + if (c->autoidle_count == 0) + c->ops->allow_idle(c); + mutex_unlock(&autoidle_mutex); + } return 0; } @@ -201,8 +219,7 @@ int omap2_clk_enable_autoidle_all(void) struct clk_hw_omap *c; list_for_each_entry(c, &clk_hw_omap_clocks, node) - if (c->ops && c->ops->allow_idle) - c->ops->allow_idle(c); + omap2_clk_allow_idle(c->hw.clk); _clk_generic_allow_autoidle_all(); @@ -223,8 +240,7 @@ int omap2_clk_disable_autoidle_all(void) struct clk_hw_omap *c; list_for_each_entry(c, &clk_hw_omap_clocks, node) - if (c->ops && c->ops->deny_idle) - c->ops->deny_idle(c); + omap2_clk_deny_idle(c->hw.clk); _clk_generic_deny_autoidle_all(); diff --git a/include/linux/clk/ti.h b/include/linux/clk/ti.h index a8faa38b1ed6..c460355419c0 100644 --- a/include/linux/clk/ti.h +++ b/include/linux/clk/ti.h @@ -159,6 +159,7 @@ struct clk_hw_omap { const char *clkdm_name; struct clockdomain *clkdm; const struct clk_hw_omap_ops *ops; + int autoidle_count; }; /*