From patchwork Wed Jul 31 21:10:46 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sowjanya Komatineni X-Patchwork-Id: 1140129 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-tegra-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=nvidia.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=nvidia.com header.i=@nvidia.com header.b="pwxbq+T8"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 45zR3C20P1z9sDQ for ; Thu, 1 Aug 2019 07:12:55 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730662AbfGaVMr (ORCPT ); Wed, 31 Jul 2019 17:12:47 -0400 Received: from hqemgate16.nvidia.com ([216.228.121.65]:10568 "EHLO hqemgate16.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727448AbfGaVLI (ORCPT ); Wed, 31 Jul 2019 17:11:08 -0400 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate16.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Wed, 31 Jul 2019 14:11:07 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Wed, 31 Jul 2019 14:11:07 -0700 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Wed, 31 Jul 2019 14:11:07 -0700 Received: from HQMAIL111.nvidia.com (172.20.187.18) by HQMAIL106.nvidia.com (172.18.146.12) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Wed, 31 Jul 2019 21:11:07 +0000 Received: from HQMAIL105.nvidia.com (172.20.187.12) by HQMAIL111.nvidia.com (172.20.187.18) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Wed, 31 Jul 2019 21:11:06 +0000 Received: from hqnvemgw01.nvidia.com (172.20.150.20) by HQMAIL105.nvidia.com (172.20.187.12) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Wed, 31 Jul 2019 21:11:06 +0000 Received: from skomatineni-linux.nvidia.com (Not Verified[10.110.102.167]) by hqnvemgw01.nvidia.com with Trustwave SEG (v7, 5, 8, 10121) id ; Wed, 31 Jul 2019 14:11:06 -0700 From: Sowjanya Komatineni To: , , , , , , , CC: , , , , , , , , , , , , , , , , , , Subject: [PATCH v7 03/20] clk: tegra: divider: Save and restore divider rate Date: Wed, 31 Jul 2019 14:10:46 -0700 Message-ID: <1564607463-28802-4-git-send-email-skomatineni@nvidia.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1564607463-28802-1-git-send-email-skomatineni@nvidia.com> References: <1564607463-28802-1-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=1564607467; bh=C/Vv+R//hhu8plFOiaQm9odxXoC5mT2dS2+ZICVm6us=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:X-NVConfidentiality:MIME-Version: Content-Type; b=pwxbq+T8NVZNQ2v5m2H9tUhZ8r6z6KJZZJw+ahcRMYPgrEHij/p8tiY3QtNT9aOKD rJb7h6UXsG8yirbuB4Km/yJN357YigQ6qpfqpp1EQ7YVbbrNkOH2P/Dxfs6Y5Siv8R PqrVQvzO/n3Mhyi8q0ipfWldOz12vdwx3SSWDEtcJofhKTRlm576vul6oo1/ZjJ0ha uBFPAOy2kM8i8lXr8XRZMqOFXhhe++Kq9PcqP7oMVBK9k7ww+vFntXF0zNDBIANdvm FhjGdchDSizs51ZJro6WM4UPSVzZpQUK9DfA58tkpPJczTPj/7V7KrxKpvS+KaUWbm lUTBoG48+X9og== Sender: linux-tegra-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org 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. 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,