From patchwork Thu Mar 25 16:40:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thierry Reding X-Patchwork-Id: 12164561 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BE40BC433DB for ; Thu, 25 Mar 2021 16:41:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9764C61A26 for ; Thu, 25 Mar 2021 16:41:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229642AbhCYQku (ORCPT ); Thu, 25 Mar 2021 12:40:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51936 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229617AbhCYQkt (ORCPT ); Thu, 25 Mar 2021 12:40:49 -0400 Received: from mail-wr1-x436.google.com (mail-wr1-x436.google.com [IPv6:2a00:1450:4864:20::436]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 020ECC06174A; Thu, 25 Mar 2021 09:40:49 -0700 (PDT) Received: by mail-wr1-x436.google.com with SMTP id c8so2928590wrq.11; Thu, 25 Mar 2021 09:40:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=BIOzYjpuWV2ikVARWL5rnMXlYplC4fVIyiluPMIE1oE=; b=T+5lmaYU0760xN0cgcjj5c8+SDzlH7A/atUQUf4fLVOx2WE54T7z8ZItEJZl86LVVR o0FPEerykYnJ0HBljGhYcwKI4YJepfTiet/oep+mOhuOJOvgJyonZP+cHnoTSfmLfYWV lRPTLweJBT7lz99SB3JACg4kCo0ZbWBiI2jLX8C6u9fzHoCJy4GGRANnNF+O3SvYEXDB UYAzmpR8wcGZc4F+05TL3vSTLf+98outM3Z9NS+G69NKHOAEx158eCryef57QwYZiKpz 5/PU5edUocmXm1scX0khV7VMSg2OVn7VZPp69hyzYYEEZAF5mdyx36Lx04en2FUyCY5r U6YQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=BIOzYjpuWV2ikVARWL5rnMXlYplC4fVIyiluPMIE1oE=; b=K+Z/31YAA5ls/sasobFPBq7Hh4F3hbhTlBTIDovMt54ebsMPjBePti1xycS9GjrKYW BXnE1S6iuh5uOMyNoV254EpSbWdjjjl8BcoQD1KWt8JEcWgqxpNmjZnknJQXTtOIH0Dz slh066BwveNLJykjyRWaqnmpnG9A1GM1AdSuJNHFc8u3Jxw7fg36IIr1qWccRnw/Nc8s 1zWGmBegzRSAmHnazHbxJv3eLu3rjd2PeIO3RsTvxEUjzIL2UZ6g238WOkcsk+Zn/cF8 o8R6Ql83JbP4+vHfl76R9QC4wngz3B/HCQWVQPoHPS17EMTibdPD/fVSevHgzgZEfu2V SKug== X-Gm-Message-State: AOAM533gTf/iP0YI+6gWXTGu6HvL/UjO0J1twSGCjmNKjCFkyfNuxXRu +R8atmB2EJrgrP8gZG0T61g= X-Google-Smtp-Source: ABdhPJyZAKo+sD+iopvWd3BFRQ8xlnIOc5+qTBvaeiQHoQwgOF2llYd0lTLSDaZWT58a8VW8MaFZOw== X-Received: by 2002:adf:9261:: with SMTP id 88mr9676623wrj.270.1616690447651; Thu, 25 Mar 2021 09:40:47 -0700 (PDT) Received: from localhost ([62.96.65.119]) by smtp.gmail.com with ESMTPSA id j16sm11847179wmi.2.2021.03.25.09.40.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 25 Mar 2021 09:40:45 -0700 (PDT) From: Thierry Reding To: Vinod Koul , Greg Kroah-Hartman Cc: Kishon Vijay Abraham I , Mathias Nyman , JC Kuo , Jon Hunter , linux-tegra@vger.kernel.org, linux-phy@lists.infradead.org, linux-usb@vger.kernel.org, Stephen Boyd Subject: [PATCH v8 01/13] clk: tegra: Add PLLE HW power sequencer control Date: Thu, 25 Mar 2021 17:40:45 +0100 Message-Id: <20210325164057.793954-2-thierry.reding@gmail.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210325164057.793954-1-thierry.reding@gmail.com> References: <20210325164057.793954-1-thierry.reding@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org From: JC Kuo PLLE has a hardware power sequencer logic which is a state machine that can power on/off PLLE without any software intervention. The sequencer has two inputs, one from XUSB UPHY PLL and the other from SATA UPHY PLL. PLLE provides reference clock to XUSB and SATA UPHY PLLs. When both of the downstream PLLs are powered-off, PLLE hardware power sequencer will automatically power off PLLE for power saving. XUSB and SATA UPHY PLLs also have their own hardware power sequencer logic. XUSB UPHY PLL is shared between XUSB SuperSpeed ports and PCIE controllers. The XUSB UPHY PLL hardware power sequencer has inputs from XUSB and PCIE. When all of the XUSB SuperSpeed ports and PCIE controllers are in low power state, XUSB UPHY PLL hardware power sequencer automatically power off PLL and flags idle to PLLE hardware power sequencer. Similar applies to SATA UPHY PLL. PLLE hardware power sequencer has to be enabled after both downstream sequencers are enabled. This commit adds two helper functions: 1. tegra210_plle_hw_sequence_start() for XUSB PADCTL driver to enable PLLE hardware sequencer at proper time. 2. tegra210_plle_hw_sequence_is_enabled() for XUSB PADCTL driver to check whether PLLE hardware sequencer has been enabled or not. Signed-off-by: JC Kuo Acked-by: Stephen Boyd Signed-off-by: Thierry Reding --- drivers/clk/tegra/clk-tegra210.c | 53 +++++++++++++++++++++++++++++++- include/linux/clk/tegra.h | 4 ++- 2 files changed, 55 insertions(+), 2 deletions(-) diff --git a/drivers/clk/tegra/clk-tegra210.c b/drivers/clk/tegra/clk-tegra210.c index 68cbb98af567..b9099012dc7b 100644 --- a/drivers/clk/tegra/clk-tegra210.c +++ b/drivers/clk/tegra/clk-tegra210.c @@ -1,6 +1,6 @@ // SPDX-License-Identifier: GPL-2.0-only /* - * Copyright (c) 2012-2014 NVIDIA CORPORATION. All rights reserved. + * Copyright (c) 2012-2020 NVIDIA CORPORATION. All rights reserved. */ #include @@ -403,6 +403,14 @@ static unsigned long tegra210_input_freq[] = { #define PLLRE_BASE_DEFAULT_MASK 0x1c000000 #define PLLRE_MISC0_WRITE_MASK 0x67ffffff +/* PLLE */ +#define PLLE_MISC_IDDQ_SW_CTRL (1 << 14) +#define PLLE_AUX_USE_LOCKDET (1 << 3) +#define PLLE_AUX_SS_SEQ_INCLUDE (1 << 31) +#define PLLE_AUX_ENABLE_SWCTL (1 << 4) +#define PLLE_AUX_SS_SWCTL (1 << 6) +#define PLLE_AUX_SEQ_ENABLE (1 << 24) + /* PLLX */ #define PLLX_USE_DYN_RAMP 1 #define PLLX_BASE_LOCK (1 << 27) @@ -489,6 +497,49 @@ static unsigned long tegra210_input_freq[] = { #define PLLU_MISC0_WRITE_MASK 0xbfffffff #define PLLU_MISC1_WRITE_MASK 0x00000007 +bool tegra210_plle_hw_sequence_is_enabled(void) +{ + u32 value; + + value = readl_relaxed(clk_base + PLLE_AUX); + if (value & PLLE_AUX_SEQ_ENABLE) + return true; + + return false; +} +EXPORT_SYMBOL_GPL(tegra210_plle_hw_sequence_is_enabled); + +int tegra210_plle_hw_sequence_start(void) +{ + u32 value; + + if (tegra210_plle_hw_sequence_is_enabled()) + return 0; + + /* skip if PLLE is not enabled yet */ + value = readl_relaxed(clk_base + PLLE_MISC0); + if (!(value & PLLE_MISC_LOCK)) + return -EIO; + + value &= ~PLLE_MISC_IDDQ_SW_CTRL; + writel_relaxed(value, clk_base + PLLE_MISC0); + + value = readl_relaxed(clk_base + PLLE_AUX); + value |= (PLLE_AUX_USE_LOCKDET | PLLE_AUX_SS_SEQ_INCLUDE); + value &= ~(PLLE_AUX_ENABLE_SWCTL | PLLE_AUX_SS_SWCTL); + writel_relaxed(value, clk_base + PLLE_AUX); + + fence_udelay(1, clk_base); + + value |= PLLE_AUX_SEQ_ENABLE; + writel_relaxed(value, clk_base + PLLE_AUX); + + fence_udelay(1, clk_base); + + return 0; +} +EXPORT_SYMBOL_GPL(tegra210_plle_hw_sequence_start); + void tegra210_xusb_pll_hw_control_enable(void) { u32 val; diff --git a/include/linux/clk/tegra.h b/include/linux/clk/tegra.h index eb016fc9cc0b..f7ff722a03dd 100644 --- a/include/linux/clk/tegra.h +++ b/include/linux/clk/tegra.h @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: GPL-2.0-only */ /* - * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. + * Copyright (c) 2012-2020, NVIDIA CORPORATION. All rights reserved. */ #ifndef __LINUX_CLK_TEGRA_H_ @@ -123,6 +123,8 @@ static inline void tegra_cpu_clock_resume(void) } #endif +extern int tegra210_plle_hw_sequence_start(void); +extern bool tegra210_plle_hw_sequence_is_enabled(void); extern void tegra210_xusb_pll_hw_control_enable(void); extern void tegra210_xusb_pll_hw_sequence_start(void); extern void tegra210_sata_pll_hw_control_enable(void);