From patchwork Mon Apr 3 19:32:49 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sebastian Reichel X-Patchwork-Id: 13198631 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 5B3B6C76196 for ; Mon, 3 Apr 2023 19:34:04 +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=0yQXNAVKSkKStnGciHEsNiYrvVMWJzEEoZzHPSr6d04=; b=I3Sc5qIpe3ZP1k aqxNhn7SRQh6tJ1T0c1l53qpAp+gVP83wVImj4M9qYdEbOhV5zTYfwVa+aWlEXCKIm5GT/HSu81e2 IaLE3y8xpxPOEA119iNMMxb13drYnL6YJlRF1UKgOv2VgWC/WWHVMmIqhnpq3tVf4Rga31Iken2Dt RzDVF0R1XV/M7txJy/64Vx5pJ7MuFos3O9rUEvzQ0dADfhjb/9UtqDGbPHBkzlQVgiWnB2yohYGeU HS4YloYH+tdmgv6KZfLk16qld6hVuWCm7+7RhubmyLuoeC5gWXR1EjlSdJE2SFNJcc2eaBMVEk5gn s5zRNcgxtbBx+WllVB7A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1pjPwD-00GPeE-0T; Mon, 03 Apr 2023 19:33:57 +0000 Received: from madras.collabora.co.uk ([2a00:1098:0:82:1000:25:2eeb:e5ab]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1pjPw5-00GPZv-1t; Mon, 03 Apr 2023 19:33:52 +0000 Received: from jupiter.universe (dyndsl-091-248-212-192.ewe-ip-backbone.de [91.248.212.192]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: sre) by madras.collabora.co.uk (Postfix) with ESMTPSA id D6E94660312D; Mon, 3 Apr 2023 20:33:43 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1680550423; bh=F/96zS0zPdj6q60fUIyGsG/Fw9YhEDL6TLivKZFxzm0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Xln756OswUfAnCQkdWSMkmJedtbLz2obLahX+3Z+vs/py3KQE61UGlQVHxAC6bDeb Dfa5krA6xhLPzF/8L8x2aE49OPugfjboZw3lpBNfW7sYJoD6UZYY+HTQAgCn2m8JhR fYT+WzoITPBsKZgp2iL+kuv2kElnc9mJ1kbgAE4jbpyGtcyWxXohLb4KhQANawc+me FXJ6NITgeN0vJ/4LfAioor8I5ZhyA3r+xGPcBmV+PMqqZgIOjQdNUCxtlYyEI5Ji2C 1KcWOAxgqSXAb+IvsrNzIawZ6fjqVk11AOMy24QG8RiDCU4cw+lumi83oLGl8NSZkz npAl0pWwcM3qg== Received: by jupiter.universe (Postfix, from userid 1000) id 4DBD64807E2; Mon, 3 Apr 2023 21:33:41 +0200 (CEST) From: Sebastian Reichel To: Heiko Stuebner , linux-rockchip@lists.infradead.org Cc: Peter Geis , Elaine Zhang , Finley Xiao , Jagan Teki , Michael Turquette , Stephen Boyd , Boris Brezillon , linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Sebastian Reichel , kernel@collabora.com, Vincent Legoll Subject: [PATCHv2 1/2] clk: rockchip: rk3588: make gate linked clocks ignore unused Date: Mon, 3 Apr 2023 21:32:49 +0200 Message-Id: <20230403193250.108693-2-sebastian.reichel@collabora.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230403193250.108693-1-sebastian.reichel@collabora.com> References: <20230403193250.108693-1-sebastian.reichel@collabora.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230403_123349_882617_CBC68A00 X-CRM114-Status: GOOD ( 23.90 ) 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 RK3588 has a couple of hardware blocks called Native Interface Unit (NIU) that gate the clocks to devices behind them. Effectively this means that some clocks require two parent clocks being enabled. Downstream implemented this by using a separate clock driver ("clk-link") for them, which enables the second clock using PM framework. In the upstream kernel we are currently missing support for the second parent. The information about it is in the GATE_LINK() macro as linkname, but that is not used. Thus the second parent clock is not properly enabled. So far this did not really matter, since these clocks are mostly required for the more advanced IP blocks, that are not yet supported upstream. As this is about to change we need a fix. There are three options available: 1. Properly implement support for having two parent clocks in the clock framework. 2. Mark the affected clocks CLK_IGNORE_UNUSED, so that they are not disabled. This wastes some power, but keeps the hack contained within the clock driver. Going from this to the first solution is easy once that has been implemented. 3. Enabling the extra clock in the consumer driver. This leaks some implementation details into DT. This patch implements the second option as an intermediate solution until the first one is available. I used an alias for CLK_IS_CRITICAL, so that it's easy to see which clocks are not really critical once the clock framework supports a better way to implement this. Tested-by: Vincent Legoll Signed-off-by: Sebastian Reichel --- drivers/clk/rockchip/clk-rk3588.c | 42 +++++++++++++++++++------------ 1 file changed, 26 insertions(+), 16 deletions(-) diff --git a/drivers/clk/rockchip/clk-rk3588.c b/drivers/clk/rockchip/clk-rk3588.c index b7ce3fbd6fa6..6994165e0395 100644 --- a/drivers/clk/rockchip/clk-rk3588.c +++ b/drivers/clk/rockchip/clk-rk3588.c @@ -13,15 +13,25 @@ #include "clk.h" /* - * GATE with additional linked clock. Downstream enables the linked clock - * (via runtime PM) whenever the gate is enabled. The downstream implementation - * does this via separate clock nodes for each of the linked gate clocks, - * which leaks parts of the clock tree into DT. It is unclear why this is - * actually needed and things work without it for simple use cases. Thus - * the linked clock is ignored for now. + * Recent Rockchip SoCs have a new hardware block called Native Interface + * Unit (NIU), which gates clocks to devices behind them. These effectively + * need two parent clocks. + * + * Downstream enables the linked clock via runtime PM whenever the gate is + * enabled. This implementation uses separate clock nodes for each of the + * linked gate clocks, which leaks parts of the clock tree into DT. + * + * The GATE_LINK macro instead takes the second parent via 'linkname', but + * ignores the information. Once the clock framework is ready to handle it, the + * information should be passed on here. But since these clocks are required to + * access multiple relevant IP blocks, such as PCIe or USB, we mark all linked + * clocks critical until a better solution is available. This will waste some + * power, but avoids leaking implementation details into DT or hanging the + * system. */ #define GATE_LINK(_id, cname, pname, linkname, f, o, b, gf) \ GATE(_id, cname, pname, f, o, b, gf) +#define RK3588_LINKED_CLK CLK_IS_CRITICAL #define RK3588_GRF_SOC_STATUS0 0x600 @@ -1446,7 +1456,7 @@ static struct rockchip_clk_branch rk3588_clk_branches[] __initdata = { COMPOSITE_NODIV(HCLK_NVM_ROOT, "hclk_nvm_root", mux_200m_100m_50m_24m_p, 0, RK3588_CLKSEL_CON(77), 0, 2, MFLAGS, RK3588_CLKGATE_CON(31), 0, GFLAGS), - COMPOSITE(ACLK_NVM_ROOT, "aclk_nvm_root", gpll_cpll_p, 0, + COMPOSITE(ACLK_NVM_ROOT, "aclk_nvm_root", gpll_cpll_p, RK3588_LINKED_CLK, RK3588_CLKSEL_CON(77), 7, 1, MFLAGS, 2, 5, DFLAGS, RK3588_CLKGATE_CON(31), 1, GFLAGS), GATE(ACLK_EMMC, "aclk_emmc", "aclk_nvm_root", 0, @@ -1675,13 +1685,13 @@ static struct rockchip_clk_branch rk3588_clk_branches[] __initdata = { RK3588_CLKGATE_CON(42), 9, GFLAGS), /* vdpu */ - COMPOSITE(ACLK_VDPU_ROOT, "aclk_vdpu_root", gpll_cpll_aupll_p, 0, + COMPOSITE(ACLK_VDPU_ROOT, "aclk_vdpu_root", gpll_cpll_aupll_p, RK3588_LINKED_CLK, RK3588_CLKSEL_CON(98), 5, 2, MFLAGS, 0, 5, DFLAGS, RK3588_CLKGATE_CON(44), 0, GFLAGS), COMPOSITE_NODIV(ACLK_VDPU_LOW_ROOT, "aclk_vdpu_low_root", mux_400m_200m_100m_24m_p, 0, RK3588_CLKSEL_CON(98), 7, 2, MFLAGS, RK3588_CLKGATE_CON(44), 1, GFLAGS), - COMPOSITE_NODIV(HCLK_VDPU_ROOT, "hclk_vdpu_root", mux_200m_100m_50m_24m_p, 0, + COMPOSITE_NODIV(HCLK_VDPU_ROOT, "hclk_vdpu_root", mux_200m_100m_50m_24m_p, RK3588_LINKED_CLK, RK3588_CLKSEL_CON(98), 9, 2, MFLAGS, RK3588_CLKGATE_CON(44), 2, GFLAGS), COMPOSITE(ACLK_JPEG_DECODER_ROOT, "aclk_jpeg_decoder_root", gpll_cpll_aupll_spll_p, 0, @@ -1732,9 +1742,9 @@ static struct rockchip_clk_branch rk3588_clk_branches[] __initdata = { COMPOSITE(ACLK_RKVENC0_ROOT, "aclk_rkvenc0_root", gpll_cpll_npll_p, 0, RK3588_CLKSEL_CON(102), 7, 2, MFLAGS, 2, 5, DFLAGS, RK3588_CLKGATE_CON(47), 1, GFLAGS), - GATE(HCLK_RKVENC0, "hclk_rkvenc0", "hclk_rkvenc0_root", 0, + GATE(HCLK_RKVENC0, "hclk_rkvenc0", "hclk_rkvenc0_root", RK3588_LINKED_CLK, RK3588_CLKGATE_CON(47), 4, GFLAGS), - GATE(ACLK_RKVENC0, "aclk_rkvenc0", "aclk_rkvenc0_root", 0, + GATE(ACLK_RKVENC0, "aclk_rkvenc0", "aclk_rkvenc0_root", RK3588_LINKED_CLK, RK3588_CLKGATE_CON(47), 5, GFLAGS), COMPOSITE(CLK_RKVENC0_CORE, "clk_rkvenc0_core", gpll_cpll_aupll_npll_p, 0, RK3588_CLKSEL_CON(102), 14, 2, MFLAGS, 9, 5, DFLAGS, @@ -1744,10 +1754,10 @@ static struct rockchip_clk_branch rk3588_clk_branches[] __initdata = { RK3588_CLKGATE_CON(48), 6, GFLAGS), /* vi */ - COMPOSITE(ACLK_VI_ROOT, "aclk_vi_root", gpll_cpll_npll_aupll_spll_p, 0, + COMPOSITE(ACLK_VI_ROOT, "aclk_vi_root", gpll_cpll_npll_aupll_spll_p, RK3588_LINKED_CLK, RK3588_CLKSEL_CON(106), 5, 3, MFLAGS, 0, 5, DFLAGS, RK3588_CLKGATE_CON(49), 0, GFLAGS), - COMPOSITE_NODIV(HCLK_VI_ROOT, "hclk_vi_root", mux_200m_100m_50m_24m_p, 0, + COMPOSITE_NODIV(HCLK_VI_ROOT, "hclk_vi_root", mux_200m_100m_50m_24m_p, RK3588_LINKED_CLK, RK3588_CLKSEL_CON(106), 8, 2, MFLAGS, RK3588_CLKGATE_CON(49), 1, GFLAGS), COMPOSITE_NODIV(PCLK_VI_ROOT, "pclk_vi_root", mux_100m_50m_24m_p, 0, @@ -1919,10 +1929,10 @@ static struct rockchip_clk_branch rk3588_clk_branches[] __initdata = { COMPOSITE(ACLK_VOP_ROOT, "aclk_vop_root", gpll_cpll_dmyaupll_npll_spll_p, 0, RK3588_CLKSEL_CON(110), 5, 3, MFLAGS, 0, 5, DFLAGS, RK3588_CLKGATE_CON(52), 0, GFLAGS), - COMPOSITE_NODIV(ACLK_VOP_LOW_ROOT, "aclk_vop_low_root", mux_400m_200m_100m_24m_p, 0, + COMPOSITE_NODIV(ACLK_VOP_LOW_ROOT, "aclk_vop_low_root", mux_400m_200m_100m_24m_p, RK3588_LINKED_CLK, RK3588_CLKSEL_CON(110), 8, 2, MFLAGS, RK3588_CLKGATE_CON(52), 1, GFLAGS), - COMPOSITE_NODIV(HCLK_VOP_ROOT, "hclk_vop_root", mux_200m_100m_50m_24m_p, 0, + COMPOSITE_NODIV(HCLK_VOP_ROOT, "hclk_vop_root", mux_200m_100m_50m_24m_p, RK3588_LINKED_CLK, RK3588_CLKSEL_CON(110), 10, 2, MFLAGS, RK3588_CLKGATE_CON(52), 2, GFLAGS), COMPOSITE_NODIV(PCLK_VOP_ROOT, "pclk_vop_root", mux_100m_50m_24m_p, 0, @@ -2425,7 +2435,7 @@ static struct rockchip_clk_branch rk3588_clk_branches[] __initdata = { GATE_LINK(ACLK_ISP1_PRE, "aclk_isp1_pre", "aclk_isp1_root", "aclk_vi_root", 0, RK3588_CLKGATE_CON(26), 6, GFLAGS), GATE_LINK(HCLK_ISP1_PRE, "hclk_isp1_pre", "hclk_isp1_root", "hclk_vi_root", 0, RK3588_CLKGATE_CON(26), 8, GFLAGS), - GATE_LINK(HCLK_NVM, "hclk_nvm", "hclk_nvm_root", "aclk_nvm_root", 0, RK3588_CLKGATE_CON(31), 2, GFLAGS), + GATE_LINK(HCLK_NVM, "hclk_nvm", "hclk_nvm_root", "aclk_nvm_root", RK3588_LINKED_CLK, RK3588_CLKGATE_CON(31), 2, GFLAGS), GATE_LINK(ACLK_USB, "aclk_usb", "aclk_usb_root", "aclk_vo1usb_top_root", 0, RK3588_CLKGATE_CON(42), 2, GFLAGS), GATE_LINK(HCLK_USB, "hclk_usb", "hclk_usb_root", "hclk_vo1usb_top_root", 0, RK3588_CLKGATE_CON(42), 3, GFLAGS), GATE_LINK(ACLK_JPEG_DECODER_PRE, "aclk_jpeg_decoder_pre", "aclk_jpeg_decoder_root", "aclk_vdpu_root", 0, RK3588_CLKGATE_CON(44), 7, GFLAGS),