From patchwork Tue Jun 18 07:46:19 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sowjanya Komatineni X-Patchwork-Id: 1117701 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-gpio-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="nZEdyTYu"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 45SgDQ5MYDz9s00 for ; Tue, 18 Jun 2019 17:48:06 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728927AbfFRHqv (ORCPT ); Tue, 18 Jun 2019 03:46:51 -0400 Received: from hqemgate15.nvidia.com ([216.228.121.64]:19658 "EHLO hqemgate15.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728877AbfFRHqu (ORCPT ); Tue, 18 Jun 2019 03:46:50 -0400 Received: from hqpgpgate102.nvidia.com (Not Verified[216.228.121.13]) by hqemgate15.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Tue, 18 Jun 2019 00:46:50 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate102.nvidia.com (PGP Universal service); Tue, 18 Jun 2019 00:46:49 -0700 X-PGP-Universal: processed; by hqpgpgate102.nvidia.com on Tue, 18 Jun 2019 00:46:49 -0700 Received: from HQMAIL112.nvidia.com (172.18.146.18) by HQMAIL103.nvidia.com (172.20.187.11) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 18 Jun 2019 07:46:48 +0000 Received: from HQMAIL104.nvidia.com (172.18.146.11) by HQMAIL112.nvidia.com (172.18.146.18) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 18 Jun 2019 07:46:48 +0000 Received: from hqnvemgw02.nvidia.com (172.16.227.111) by HQMAIL104.nvidia.com (172.18.146.11) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Tue, 18 Jun 2019 07:46:48 +0000 Received: from skomatineni-linux.nvidia.com (Not Verified[10.2.168.217]) by hqnvemgw02.nvidia.com with Trustwave SEG (v7, 5, 8, 10121) id ; Tue, 18 Jun 2019 00:46:48 -0700 From: Sowjanya Komatineni To: , , , , , , , CC: , , , , , , , , , , , , , , , Subject: [PATCH V3 05/17] clk: tegra: pllout: save and restore pllout context Date: Tue, 18 Jun 2019 00:46:19 -0700 Message-ID: <1560843991-24123-6-git-send-email-skomatineni@nvidia.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1560843991-24123-1-git-send-email-skomatineni@nvidia.com> References: <1560843991-24123-1-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=1560844010; bh=Fzu2bnKTENqIS6KXMYVarTHgv0l912Cey6G3jQKOW8c=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:X-NVConfidentiality:MIME-Version: Content-Type; b=nZEdyTYucXwLVnD5zK4QnqT+ncZAbxqTqF5uPDpP5MfIbvasiNFCBWs3k75E1BVdo +34W/kyhru5QrdgiOIbhbKoivkYSQLp5GrXyi8P9Bx2sCqxZzqOG+fRSwNylgNlatX ZFGjLnEqVdOt8RNUa+FSt/iWnjIVkBA1XXflIGVlEwPFWSmRXfEq4M0vlOh6hPIXcg vaZXvnAq3WrUTeg77NmSsJT/HobtP9KROrHpAv+FcFEIPrJ9RI8GsU/QDcxOBDa0cp FNsIXUGPZkc5WoQ0/dBR72a/Zcdc40SrIGrYYMfUyNdgUPiqYObcLfJ9SCEBKcQ2ko 8SHYbnn4m0F6Q== Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org This patch implements save and restore of pllout context. During system suspend, core power goes off and looses the settings of the Tegra CAR controller registers. So during suspend entry the state of pllout is saved and on resume it is restored back to have pllout in same state as before suspend. pllout rate is saved and restore in clock divider so it will be at same rate as before suspend when pllout state is restored. Signed-off-by: Sowjanya Komatineni Acked-by: Thierry Reding --- drivers/clk/tegra/clk-pll-out.c | 28 ++++++++++++++++++++++++++++ drivers/clk/tegra/clk.h | 3 +++ 2 files changed, 31 insertions(+) diff --git a/drivers/clk/tegra/clk-pll-out.c b/drivers/clk/tegra/clk-pll-out.c index 35f2bf00e1e6..52d140379ce3 100644 --- a/drivers/clk/tegra/clk-pll-out.c +++ b/drivers/clk/tegra/clk-pll-out.c @@ -69,10 +69,38 @@ static void clk_pll_out_disable(struct clk_hw *hw) spin_unlock_irqrestore(pll_out->lock, flags); } +static int tegra_clk_pll_out_save_context(struct clk_hw *hw) +{ + struct tegra_clk_pll_out *pll_out = to_clk_pll_out(hw); + + if (!strcmp(__clk_get_name(hw->clk), "pll_re_out1")) + pll_out->pllout_ctx = readl_relaxed(pll_out->reg); + else + pll_out->pllout_ctx = clk_hw_get_rate(hw); + + return 0; +} + +static void tegra_clk_pll_out_restore_context(struct clk_hw *hw) +{ + struct tegra_clk_pll_out *pll_out = to_clk_pll_out(hw); + + if (!strcmp(__clk_get_name(hw->clk), "pll_re_out1")) { + writel_relaxed(pll_out->pllout_ctx, pll_out->reg); + } else { + if (!__clk_get_enable_count(hw->clk)) + clk_pll_out_disable(hw); + else + clk_pll_out_enable(hw); + } +} + const struct clk_ops tegra_clk_pll_out_ops = { .is_enabled = clk_pll_out_is_enabled, .enable = clk_pll_out_enable, .disable = clk_pll_out_disable, + .save_context = tegra_clk_pll_out_save_context, + .restore_context = tegra_clk_pll_out_restore_context, }; struct clk *tegra_clk_register_pll_out(const char *name, diff --git a/drivers/clk/tegra/clk.h b/drivers/clk/tegra/clk.h index 83623f5f55f3..b47f373c35ad 100644 --- a/drivers/clk/tegra/clk.h +++ b/drivers/clk/tegra/clk.h @@ -439,6 +439,8 @@ struct clk *tegra_clk_register_pllu_tegra210(const char *name, * @rst_bit_idx: bit to reset PLL divider * @lock: register lock * @flags: hardware-specific flags + * @pllout_ctx: pllout context to save and restore during suspend + * and resume */ struct tegra_clk_pll_out { struct clk_hw hw; @@ -447,6 +449,7 @@ struct tegra_clk_pll_out { u8 rst_bit_idx; spinlock_t *lock; u8 flags; + unsigned int pllout_ctx; }; #define to_clk_pll_out(_hw) container_of(_hw, struct tegra_clk_pll_out, hw)