From patchwork Tue May 28 23:08:50 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sowjanya Komatineni X-Patchwork-Id: 10965921 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 7F52413AD for ; Tue, 28 May 2019 23:09:49 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6E134288B3 for ; Tue, 28 May 2019 23:09:49 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 55F23288C7; Tue, 28 May 2019 23:09:49 +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=ham 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 D37A8288B3 for ; Tue, 28 May 2019 23:09:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727998AbfE1XJf (ORCPT ); Tue, 28 May 2019 19:09:35 -0400 Received: from hqemgate15.nvidia.com ([216.228.121.64]:11170 "EHLO hqemgate15.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727158AbfE1XJC (ORCPT ); Tue, 28 May 2019 19:09:02 -0400 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate15.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Tue, 28 May 2019 16:08:52 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Tue, 28 May 2019 16:09:00 -0700 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Tue, 28 May 2019 16:09:00 -0700 Received: from HQMAIL104.nvidia.com (172.18.146.11) by HQMAIL106.nvidia.com (172.18.146.12) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 28 May 2019 23:09:00 +0000 Received: from hqnvemgw01.nvidia.com (172.20.150.20) by HQMAIL104.nvidia.com (172.18.146.11) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Tue, 28 May 2019 23:09:00 +0000 Received: from skomatineni-linux.nvidia.com (Not Verified[10.110.103.86]) by hqnvemgw01.nvidia.com with Trustwave SEG (v7,5,8,10121) id ; Tue, 28 May 2019 16:09:00 -0700 From: Sowjanya Komatineni To: , , , , , , , CC: , , , , , , , , , , , , , , Subject: [PATCH V2 06/12] clk: tegra: add suspend resume support for DFLL clock Date: Tue, 28 May 2019 16:08:50 -0700 Message-ID: <1559084936-4610-7-git-send-email-skomatineni@nvidia.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1559084936-4610-1-git-send-email-skomatineni@nvidia.com> References: <1559084936-4610-1-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=1559084932; bh=lTpT7DxosrZ9TQTC+BpXXH/Ud8iXV1MHsBfPb7XBsEY=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:X-NVConfidentiality:MIME-Version: Content-Type; b=mnC3GHVs7hMsBZ29FIHNeGCVQqmFhi7l7g8t/5Tc+BjpWY1wGlP7RS8wmLQTJHz3z kXGBY/LZxc5CsV66qj/ftT6ukzlT/um7mYUby5frdd0mgLrh9cauoQbDr9yiupj21W dl36o0CZhJ24BUGs8BQ+osOmaaNUOuQ1AA59BttDYiDSyC2dHAiiAcG1j6ZTMz6rBB J3rraxUzLcqHDcU6U12v8EZqUhDuy8ZPp/nYfqoXkv2rutm759x01Ieb5SLNRJ5WaI V1YF4g9eZAhrhJih8cgc2qpkESjcLnWv+CixoJKWZnafh2e7Flngo+XrMCgk9uqWt5 Hx/SVnuIxr3Iw== 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 This patch adds support for suspend and resume for DFLL clock. Signed-off-by: Sowjanya Komatineni --- drivers/clk/tegra/clk-dfll.c | 82 ++++++++++++++++++++++++++++++++++++++++++++ drivers/clk/tegra/clk-dfll.h | 2 ++ 2 files changed, 84 insertions(+) diff --git a/drivers/clk/tegra/clk-dfll.c b/drivers/clk/tegra/clk-dfll.c index 1fc71baae13b..d92a5a05fbbc 100644 --- a/drivers/clk/tegra/clk-dfll.c +++ b/drivers/clk/tegra/clk-dfll.c @@ -286,6 +286,7 @@ struct tegra_dfll { unsigned long dvco_rate_min; enum dfll_ctrl_mode mode; + enum dfll_ctrl_mode resume_mode; enum dfll_tune_range tune_range; struct dentry *debugfs_dir; struct clk_hw dfll_clk_hw; @@ -1873,6 +1874,87 @@ static int dfll_fetch_common_params(struct tegra_dfll *td) } /* + * tegra_dfll_suspend + * @pdev: DFLL instance + * + * dfll controls clock/voltage to other devices, including CPU. Therefore, + * dfll driver pm suspend callback does not stop cl-dvfs operations. It is + * only used to enforce cold voltage limit, since SoC may cool down during + * suspend without waking up. The correct temperature zone after suspend will + * be updated via dfll cooling device interface during resume of temperature + * sensor. + */ +void tegra_dfll_suspend(struct platform_device *pdev) +{ + struct tegra_dfll *td = dev_get_drvdata(&pdev->dev); + + if (!td) + return; + + if (td->mode <= DFLL_DISABLED) + return; + + td->resume_mode = td->mode; + switch (td->mode) { + case DFLL_CLOSED_LOOP: + dfll_set_mode(td, DFLL_CLOSED_LOOP); + dfll_set_frequency_request(td, &td->last_req); + + dfll_unlock(td); + break; + default: + break; + } +} + +/** + * tegra_dfll_resume - reprogram the DFLL after context-loss + * @pdev: DFLL instance + * + * Re-initialize and enable target device clock in open loop mode. Called + * directly from SoC clock resume syscore operation. Closed loop will be + * re-entered in platform syscore ops as well after CPU clock source is + * switched to DFLL in open loop. + */ +void tegra_dfll_resume(struct platform_device *pdev, bool on_dfll) +{ + struct tegra_dfll *td = dev_get_drvdata(&pdev->dev); + + if (!td) + return; + + if (on_dfll) { + if (td->resume_mode == DFLL_CLOSED_LOOP) + dfll_lock(td); + td->resume_mode = DFLL_DISABLED; + return; + } + + reset_control_deassert(td->dvco_rst); + + pm_runtime_get(td->dev); + + /* Re-init DFLL */ + dfll_init_out_if(td); + dfll_set_default_params(td); + dfll_set_open_loop_config(td); + + pm_runtime_put(td->dev); + + /* Restore last request and mode up to open loop */ + switch (td->resume_mode) { + case DFLL_CLOSED_LOOP: + case DFLL_OPEN_LOOP: + dfll_set_mode(td, DFLL_OPEN_LOOP); + if (td->pmu_if == TEGRA_DFLL_PMU_I2C) + dfll_i2c_set_output_enabled(td, false); + break; + default: + break; + } +} + +/* * API exported to per-SoC platform drivers */ diff --git a/drivers/clk/tegra/clk-dfll.h b/drivers/clk/tegra/clk-dfll.h index 85d0d95223f3..44160b0495fe 100644 --- a/drivers/clk/tegra/clk-dfll.h +++ b/drivers/clk/tegra/clk-dfll.h @@ -48,6 +48,8 @@ struct tegra_dfll_soc_data { int tegra_dfll_register(struct platform_device *pdev, struct tegra_dfll_soc_data *soc); struct tegra_dfll_soc_data *tegra_dfll_unregister(struct platform_device *pdev); +void tegra_dfll_suspend(struct platform_device *pdev); +void tegra_dfll_resume(struct platform_device *pdev, bool on_dfll); int tegra_dfll_runtime_suspend(struct device *dev); int tegra_dfll_runtime_resume(struct device *dev);