From patchwork Wed May 4 21:32:36 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Sebastian Reichel X-Patchwork-Id: 12838580 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7E520C4332F for ; Wed, 4 May 2022 21:34:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=+eUFzV+zAGAWA41pav4LCiCro8ttX0WS9kcc5C5+cOo=; b=2qF+47FCoX2077 8V1yEyFGS0MLDLRo+7yI5MUknwy2pgX7OzT5TIoes1nFB4FZtuJrbr5o3baPOxkp3OLR/L0nii8Dv 2yOZ+WqH6fegTFhgsUpzJw0yfM8f9pqKTs70OMxXfWleYjWiF4EhgYYOhDRSwG68RcfH71hKEaw/J LDiaMaFgjwC+xjNXtvztQHpq7hyFSG4bn8oG1hw07qkjnX1rh69JnduzyPcIWMj6rgoM/Q2vZYum2 8EMlabz/VOHq8YbUFWF7iM1rJYZpCkIAHGrNOYgcG3yro7XsehA4k5gXMzW67LEedA5Luo+COCL+x G3e6BzaS3c116Q9mS9ug==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nmMdd-00CpcS-Cr; Wed, 04 May 2022 21:34:25 +0000 Received: from bhuna.collabora.co.uk ([46.235.227.227]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nmMcM-00Cosc-HB; Wed, 04 May 2022 21:33:08 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: sre) with ESMTPSA id 5A37E1F44C61 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1651699978; bh=JyODDbAkozctO2YF4+4+8QrF0xaiP+MYadCgEeOgwr0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SZVxLjPp0nk7QVAUdBbqzeVOyWnyf3C96JzVREw2VaHYZO4j6U11qxqzBh/iLh6dD uBjrG6Izun+ZQitJpN8On6x1gMJMzDEJ0jEd3aEi3z7VW+Kk6EgZZPlkknY5zyiXU/ XEUIuM8nxFudAcakCvKv1KZkHnG2j3w7L+oRpniJC8mZL1hw41csv0jyeWGwvR3JYt /FvJ4xN/qoPEeOMAQRwefuynRMadQI7+65Wg5BM4sAaQgwvoqBiV0zPiicXtzzbbPw de3FwmkSQd0+6D8eX62EiAmjjtBW/8VGkUPrcHWKC/DRd4UqB6vJX7lHK8VMGzbPhN dMptSfJAqNzmg== Received: by jupiter.universe (Postfix, from userid 1000) id 3AA3F4819CB; Wed, 4 May 2022 23:32:53 +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: [PATCHv2 06/21] clk: rockchip: clk-cpu: add mux setting for cpu change frequency Date: Wed, 4 May 2022 23:32:36 +0200 Message-Id: <20220504213251.264819-7-sebastian.reichel@collabora.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220504213251.264819-1-sebastian.reichel@collabora.com> References: <20220504213251.264819-1-sebastian.reichel@collabora.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220504_143306_965542_6D86A517 X-CRM114-Status: GOOD ( 17.14 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.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]; }; /**