From patchwork Fri Aug 16 19:41:48 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sowjanya Komatineni X-Patchwork-Id: 11098215 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 D10DF1399 for ; Fri, 16 Aug 2019 19:43:52 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C0A45289DC for ; Fri, 16 Aug 2019 19:43:52 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B4031289EF; Fri, 16 Aug 2019 19:43:52 +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=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 6DC63289DC for ; Fri, 16 Aug 2019 19:43:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727681AbfHPTm0 (ORCPT ); Fri, 16 Aug 2019 15:42:26 -0400 Received: from hqemgate15.nvidia.com ([216.228.121.64]:14953 "EHLO hqemgate15.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727671AbfHPTm0 (ORCPT ); Fri, 16 Aug 2019 15:42:26 -0400 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate15.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Fri, 16 Aug 2019 12:42:31 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Fri, 16 Aug 2019 12:42:20 -0700 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Fri, 16 Aug 2019 12:42:20 -0700 Received: from HQMAIL107.nvidia.com (172.20.187.13) by HQMAIL105.nvidia.com (172.20.187.12) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Fri, 16 Aug 2019 19:42:19 +0000 Received: from hqnvemgw01.nvidia.com (172.20.150.20) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Fri, 16 Aug 2019 19:42:19 +0000 Received: from skomatineni-linux.nvidia.com (Not Verified[10.2.166.126]) by hqnvemgw01.nvidia.com with Trustwave SEG (v7,5,8,10121) id ; Fri, 16 Aug 2019 12:42:19 -0700 From: Sowjanya Komatineni To: , , , , , , , CC: , , , , , , , , , , , , , , , , , , Subject: [PATCH v9 03/22] clk: tegra: divider: Save and restore divider rate Date: Fri, 16 Aug 2019 12:41:48 -0700 Message-ID: <1565984527-5272-4-git-send-email-skomatineni@nvidia.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1565984527-5272-1-git-send-email-skomatineni@nvidia.com> References: <1565984527-5272-1-git-send-email-skomatineni@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1565984551; bh=MtqUu0N+Lpcr8Jj2xIV5/hjuwWqS7+q8M0ew1JLKB4s=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:X-NVConfidentiality:MIME-Version: Content-Type; b=r8DB3jlBjs40CV7Z9w/NCWZyqjS4DGYdDdqjH7HbwIj2hGnRHcK3XTO7BQgRYirIq CFXZq4+yZkuOH6LzOB4f8BZdKcm4782JKbA/nyxVMxHUtuMn88yP/7ywif9kqJiWcw HJ+cW2JwSVfQwrnFq3Yd5LdOgM5ncHn5ZbCSgcQSWthzELWdFqn7itakPeTvyhO11w BuZsRD/3B700VlUlIxZyKurPD0ap6TMOqXOzYF5on38sU7XiWEmhv9y2KA4OQwA64t UZhRFVMdJWValy3C62KOFAVhtmURFb+dDvDloR6UXJ/V/4EnHbgYb78l0jyva5XugW g7xSGTgEKYEoQ== Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch implements context restore for clock divider. During system suspend, core power goes off and looses the settings of the Tegra CAR controller registers. So on resume, clock dividers are restored back for normal operation. Acked-by: Thierry Reding Reviewed-by: Dmitry Osipenko Signed-off-by: Sowjanya Komatineni --- drivers/clk/tegra/clk-divider.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/clk/tegra/clk-divider.c b/drivers/clk/tegra/clk-divider.c index e76731fb7d69..ca0de5f11f84 100644 --- a/drivers/clk/tegra/clk-divider.c +++ b/drivers/clk/tegra/clk-divider.c @@ -109,10 +109,21 @@ static int clk_frac_div_set_rate(struct clk_hw *hw, unsigned long rate, return 0; } +static void clk_divider_restore_context(struct clk_hw *hw) +{ + struct clk_hw *parent = clk_hw_get_parent(hw); + unsigned long parent_rate = clk_hw_get_rate(parent); + unsigned long rate = clk_hw_get_rate(hw); + + if (clk_frac_div_set_rate(hw, rate, parent_rate) < 0) + WARN_ON(1); +} + const struct clk_ops tegra_clk_frac_div_ops = { .recalc_rate = clk_frac_div_recalc_rate, .set_rate = clk_frac_div_set_rate, .round_rate = clk_frac_div_round_rate, + .restore_context = clk_divider_restore_context, }; struct clk *tegra_clk_register_divider(const char *name,