From patchwork Fri Apr 22 17:09:05 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Sebastian Reichel X-Patchwork-Id: 12823846 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A9A3EC433FE for ; Fri, 22 Apr 2022 17:11:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234575AbiDVRO0 (ORCPT ); Fri, 22 Apr 2022 13:14:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53428 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242615AbiDVRMe (ORCPT ); Fri, 22 Apr 2022 13:12:34 -0400 Received: from bhuna.collabora.co.uk (bhuna.collabora.co.uk [46.235.227.227]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D4CBB92304; Fri, 22 Apr 2022 10:09:37 -0700 (PDT) Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: sre) with ESMTPSA id 1764D1F468DD DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1650647375; bh=JyODDbAkozctO2YF4+4+8QrF0xaiP+MYadCgEeOgwr0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PiwXSCIeNFXJDbDuRsS0Znqr5Lz7z/o749sD4Fkr/ZuG3r3SBBZRwyTW6Ln/Ysw3h Jl26DLa6JJGIe7bzvRQkAozr9btvB5YUh6w3LYgjp3defiGILiMxU6ahTzrtmaqoDN u0HlzBCi25TFJckd/Kc5Pt0WoLuSThdD5i1W5PSyfKe1q+dXheyE/fpkmX9cqMVTRM cbZWyZcz/dG5JK9AhpC6bLChAF4GRFmhmLeAZWKEgzJ/BQ6cQrceUhjDCEqNIKc+o4 4aP8LY1JNbUWGeUeewL30L0ziciOsHuL4eQ8CWbzZDIKJuU6leDuB6cD68ryibhyUX l1dEYWDgfrtbA== Received: by jupiter.universe (Postfix, from userid 1000) id C902F4807F0; Fri, 22 Apr 2022 19:09:32 +0200 (CEST) From: Sebastian Reichel To: Heiko Stuebner Cc: Rob Herring , Krzysztof Kozlowski , Linus Walleij , Bartosz Golaszewski , Adrian Hunter , Ulf Hansson , Philipp Zabel , Michael Turquette , Stephen Boyd , linux-clk@vger.kernel.org, linux-mmc@vger.kernel.org, linux-gpio@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, kernel@lists.collabora.co.uk, Elaine Zhang , kernel@collabora.com, Sebastian Reichel Subject: [PATCHv1 04/19] clk: rockchip: clk-cpu: add mux setting for cpu change frequency Date: Fri, 22 Apr 2022 19:09:05 +0200 Message-Id: <20220422170920.401914-5-sebastian.reichel@collabora.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220422170920.401914-1-sebastian.reichel@collabora.com> References: <20220422170920.401914-1-sebastian.reichel@collabora.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org From: Elaine Zhang In order to improve the main frequency of CPU, the clock path of CPU is simplified as follows: |--\ | \ |--\ --apll--|\ | \ | \ | |--apll_core--| \ | \ --24M---|/ |mux1 |--[gate]--|mux2|---clk_core | / | / --gpll--|\ | / |------| / | |--gpll_core--| / | |--/ --24M---|/ |--/ | | -------apll_directly--------------| When the CPU requests high frequency, we want to use MUX2 select the "apll_directly". At low frequencies use MUX1 to select “apll_core" and then MUX2 to select "apll_core_gate". However, in this way, the CPU frequency conversion needs to be in the following order: 1. MUX2 select to "apll_core_gate", MUX1 select "gpll_core" 2. Apll sets slow_mode, sets APLL parameters, locks APLL, and then APLL sets normal_mode 3. MUX1 select "apll_core", MUX2 select "apll_directly" So add pre_muxs and post_muxs to cover this special requirements. Signed-off-by: Elaine Zhang [rebase] Signed-off-by: Sebastian Reichel --- drivers/clk/rockchip/clk-cpu.c | 41 ++++++++++++++++++++++++++++++++++ drivers/clk/rockchip/clk.h | 2 ++ 2 files changed, 43 insertions(+) diff --git a/drivers/clk/rockchip/clk-cpu.c b/drivers/clk/rockchip/clk-cpu.c index 11aa2259b532..6ea7fba9f9e5 100644 --- a/drivers/clk/rockchip/clk-cpu.c +++ b/drivers/clk/rockchip/clk-cpu.c @@ -113,6 +113,42 @@ static void rockchip_cpuclk_set_dividers(struct rockchip_cpuclk *cpuclk, } } +static void rockchip_cpuclk_set_pre_muxs(struct rockchip_cpuclk *cpuclk, + const struct rockchip_cpuclk_rate_table *rate) +{ + int i; + + /* alternate parent is active now. set the pre_muxs */ + for (i = 0; i < ARRAY_SIZE(rate->pre_muxs); i++) { + const struct rockchip_cpuclk_clksel *clksel = &rate->pre_muxs[i]; + + if (!clksel->reg) + break; + + pr_debug("%s: setting reg 0x%x to 0x%x\n", + __func__, clksel->reg, clksel->val); + writel(clksel->val, cpuclk->reg_base + clksel->reg); + } +} + +static void rockchip_cpuclk_set_post_muxs(struct rockchip_cpuclk *cpuclk, + const struct rockchip_cpuclk_rate_table *rate) +{ + int i; + + /* alternate parent is active now. set the muxs */ + for (i = 0; i < ARRAY_SIZE(rate->post_muxs); i++) { + const struct rockchip_cpuclk_clksel *clksel = &rate->post_muxs[i]; + + if (!clksel->reg) + break; + + pr_debug("%s: setting reg 0x%x to 0x%x\n", + __func__, clksel->reg, clksel->val); + writel(clksel->val, cpuclk->reg_base + clksel->reg); + } +} + static int rockchip_cpuclk_pre_rate_change(struct rockchip_cpuclk *cpuclk, struct clk_notifier_data *ndata) { @@ -165,6 +201,9 @@ static int rockchip_cpuclk_pre_rate_change(struct rockchip_cpuclk *cpuclk, cpuclk->reg_base + reg_data->core_reg[i]); } } + + rockchip_cpuclk_set_pre_muxs(cpuclk, rate); + /* select alternate parent */ if (reg_data->mux_core_reg) writel(HIWORD_UPDATE(reg_data->mux_core_alt, @@ -219,6 +258,8 @@ static int rockchip_cpuclk_post_rate_change(struct rockchip_cpuclk *cpuclk, reg_data->mux_core_shift), cpuclk->reg_base + reg_data->core_reg[0]); + rockchip_cpuclk_set_post_muxs(cpuclk, rate); + /* remove dividers */ for (i = 0; i < reg_data->num_cores; i++) { writel(HIWORD_UPDATE(0, reg_data->div_core_mask[i], diff --git a/drivers/clk/rockchip/clk.h b/drivers/clk/rockchip/clk.h index bf7c8d082fde..2bd1863a7418 100644 --- a/drivers/clk/rockchip/clk.h +++ b/drivers/clk/rockchip/clk.h @@ -380,6 +380,8 @@ struct rockchip_cpuclk_clksel { struct rockchip_cpuclk_rate_table { unsigned long prate; struct rockchip_cpuclk_clksel divs[ROCKCHIP_CPUCLK_NUM_DIVIDERS]; + struct rockchip_cpuclk_clksel pre_muxs[ROCKCHIP_CPUCLK_NUM_DIVIDERS]; + struct rockchip_cpuclk_clksel post_muxs[ROCKCHIP_CPUCLK_NUM_DIVIDERS]; }; /**