From patchwork Sun Nov 21 23:27:41 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sam Protsenko X-Patchwork-Id: 517467 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 877BCC433F5 for ; Sun, 21 Nov 2021 23:27:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231974AbhKUXbE (ORCPT ); Sun, 21 Nov 2021 18:31:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43450 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231709AbhKUXbC (ORCPT ); Sun, 21 Nov 2021 18:31:02 -0500 Received: from mail-lf1-x129.google.com (mail-lf1-x129.google.com [IPv6:2a00:1450:4864:20::129]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B1288C061763 for ; Sun, 21 Nov 2021 15:27:54 -0800 (PST) Received: by mail-lf1-x129.google.com with SMTP id bi37so72135977lfb.5 for ; Sun, 21 Nov 2021 15:27:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=6aqpdUn2ADmAje4X3NYNku5B4XO9mUxiC98/Xj1uCXg=; b=vpJc6TLBfNnEFinKdNtG8MKQSF+JD1sNhlYhlunu3mk0YFsKMbPc/rPmDVXqQrHU2C lD2wx3/ZKq9UdyxV5vVPbBCm/C/KIphlIUA2loHUAgLTeQrIxQHt9cGZVigM/D3grRFO wUps0JEOEzGpQdUEWCDryN9TQWzKkvrwFzYjEdXolKEAnR96frGJz/kgp/lmeC/+RFwK dALpG1m65xJX7zhVghz/DeLHUKZiLoAab4RLlDnUmAWLS+OYK3rrTLCxRepv9hIfajPI uF1xZ3aj3XWejROFYTr0/BN1A/ZImsn7d8c7Q94T0njqfB9YYbAq/af+kOKxaU8IRd63 K2ag== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=6aqpdUn2ADmAje4X3NYNku5B4XO9mUxiC98/Xj1uCXg=; b=mCg3pNcA3vNR5fSplpACyikjxr4kz6QlpvWQrrJJGVLo24x1FVRPr37kppPYGZlpVX 3H+zrGLAC5c3Q16ZCc8j8B1iKw3Ric/dki8YqL+NP75G8iXxO1zIgYigv4EI3GiXBXu2 m6ZSghaEe1WBFc3RPjGzlI8JpDjMC+ltG/5hYWVXCNVj3uxjfHd5w98JcjpAnCDhcpnG qJ9EoUqpKwBKskfdk5+kcpMpWV4JkOrmU290Yr7HpFBl9iZ482/jimylLO4zf3goyTbk eRUIw0E9nfU6x92bzbi2ecmwOdDqaGuvDlK48fCq+JRajj8N4LdB75ebGiHHbxfgYN4O 9bHg== X-Gm-Message-State: AOAM530eDE3qgcp+/KHQ4H5dHX/BrKNUu6eVYQDOpWvPZk7gmMASRQtm pJ5p0alTW21csOeOZie2jG5l4g== X-Google-Smtp-Source: ABdhPJz+S1jtyGQkCNs22HZj8wJZpFPp/LS44MVhNbn0orvX/Q2jDmdyb1HX35k+HJwKcz9RG2JgpQ== X-Received: by 2002:a05:6512:128f:: with SMTP id u15mr52325994lfs.92.1637537273121; Sun, 21 Nov 2021 15:27:53 -0800 (PST) Received: from localhost ([31.134.121.151]) by smtp.gmail.com with ESMTPSA id x6sm777498lfu.79.2021.11.21.15.27.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 21 Nov 2021 15:27:52 -0800 (PST) From: Sam Protsenko To: Sylwester Nawrocki , Krzysztof Kozlowski , Chanwoo Choi , Tomasz Figa , Rob Herring , Stephen Boyd , Michael Turquette Cc: David Virag , =?utf-8?q?Pawe=C5=82_Chmiel?= , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org Subject: [PATCH 6/6] clk: samsung: exynos850: Keep some crucial clocks running Date: Mon, 22 Nov 2021 01:27:41 +0200 Message-Id: <20211121232741.6967-7-semen.protsenko@linaro.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211121232741.6967-1-semen.protsenko@linaro.org> References: <20211121232741.6967-1-semen.protsenko@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org Some clocks shouldn't be automatically disabled in clk_disable_unused(), otherwise kernel hangs. Mark those clocks with: - CLK_IS_CRITICAL flag, when there won't be any consumers for that clock, but system can't function when it's gated - CLK_IGNORE_UNUSED flag, when consumer driver will be probably added later That makes it possible to run the kernel without passing the "clk_ignore_unused" param. Next clocks were modified: - "gout_dpu_cmu_dpu_pclk": CLK_IGNORE_UNUSED Will be enabled later in DSIM driver (Display Serial Interface Master). - "gout_gpio_peri_pclk": CLK_IGNORE_UNUSED "gout_gpio_cmgp_pclk": CLK_IGNORE_UNUSED "gout_gpio_hsi_pclk": CLK_IGNORE_UNUSED Should be probably enabled in corresponding GPIO driver later, or made CLK_IS_CRITICAL. "gout_gpio_peri_clk" is actually used by LEDs on Exynos850-based dev board, so kernel hangs if this clock is not running. Other clocks were marked as "ignore unused" to prevent similar issues for other use cases or boards that might be added later. - "gout_cci_aclk": CLK_IS_CRITICAL CCI (Cache Coherent Interconnect): obviously is critical. - "gout_gic_clk": CLK_IS_CRITICAL GIC (Generic Interrupt Controller): obviously is critical. Signed-off-by: Sam Protsenko --- drivers/clk/samsung/clk-exynos850.c | 19 +++++++++++++------ 1 file changed, 13 insertions(+), 6 deletions(-) diff --git a/drivers/clk/samsung/clk-exynos850.c b/drivers/clk/samsung/clk-exynos850.c index 1d257bca8b37..c885ffb1aa24 100644 --- a/drivers/clk/samsung/clk-exynos850.c +++ b/drivers/clk/samsung/clk-exynos850.c @@ -596,9 +596,10 @@ static const struct samsung_gate_clock cmgp_gate_clks[] __initconst = { GATE(CLK_GOUT_CMGP_ADC_S1_PCLK, "gout_adc_s1_pclk", "gout_clkcmu_cmgp_bus", CLK_CON_GAT_GOUT_CMGP_ADC_PCLK_S1, 21, 0, 0), + /* TODO: Should be enabled in GPIO driver (or made CLK_IS_CRITICAL) */ GATE(CLK_GOUT_CMGP_GPIO_PCLK, "gout_gpio_cmgp_pclk", "gout_clkcmu_cmgp_bus", - CLK_CON_GAT_GOUT_CMGP_GPIO_PCLK, 21, 0, 0), + CLK_CON_GAT_GOUT_CMGP_GPIO_PCLK, 21, CLK_IGNORE_UNUSED, 0), GATE(CLK_GOUT_CMGP_USI0_IPCLK, "gout_cmgp_usi0_ipclk", "dout_cmgp_usi0", CLK_CON_GAT_GOUT_CMGP_USI_CMGP0_IPCLK, 21, 0, 0), GATE(CLK_GOUT_CMGP_USI0_PCLK, "gout_cmgp_usi0_pclk", @@ -685,8 +686,9 @@ static const struct samsung_gate_clock hsi_gate_clks[] __initconst = { CLK_CON_GAT_HSI_USB20DRD_TOP_I_REF_CLK_50, 21, 0, 0), GATE(CLK_GOUT_USB_PHY_REF_CLK, "gout_usb_phy_ref", "oscclk", CLK_CON_GAT_HSI_USB20DRD_TOP_I_PHY_REFCLK_26, 21, 0, 0), + /* TODO: Should be enabled in GPIO driver (or made CLK_IS_CRITICAL) */ GATE(CLK_GOUT_GPIO_HSI_PCLK, "gout_gpio_hsi_pclk", "mout_hsi_bus_user", - CLK_CON_GAT_GOUT_HSI_GPIO_HSI_PCLK, 21, 0, 0), + CLK_CON_GAT_GOUT_HSI_GPIO_HSI_PCLK, 21, CLK_IGNORE_UNUSED, 0), GATE(CLK_GOUT_MMC_CARD_ACLK, "gout_mmc_card_aclk", "mout_hsi_bus_user", CLK_CON_GAT_GOUT_HSI_MMC_CARD_I_ACLK, 21, 0, 0), GATE(CLK_GOUT_MMC_CARD_SDCLKIN, "gout_mmc_card_sdclkin", @@ -869,9 +871,10 @@ static const struct samsung_gate_clock peri_gate_clks[] __initconst = { CLK_CON_GAT_GOUT_PERI_WDT_0_PCLK, 21, 0, 0), GATE(CLK_GOUT_WDT1_PCLK, "gout_wdt1_pclk", "mout_peri_bus_user", CLK_CON_GAT_GOUT_PERI_WDT_1_PCLK, 21, 0, 0), + /* TODO: Should be enabled in GPIO driver (or made CLK_IS_CRITICAL) */ GATE(CLK_GOUT_GPIO_PERI_PCLK, "gout_gpio_peri_pclk", "mout_peri_bus_user", - CLK_CON_GAT_GOUT_PERI_GPIO_PERI_PCLK, 21, 0, 0), + CLK_CON_GAT_GOUT_PERI_GPIO_PERI_PCLK, 21, CLK_IGNORE_UNUSED, 0), }; static const struct samsung_cmu_info peri_cmu_info __initconst = { @@ -954,10 +957,12 @@ static const struct samsung_div_clock core_div_clks[] __initconst = { }; static const struct samsung_gate_clock core_gate_clks[] __initconst = { + /* CCI (interconnect) clock must be always running */ GATE(CLK_GOUT_CCI_ACLK, "gout_cci_aclk", "mout_core_cci_user", - CLK_CON_GAT_GOUT_CORE_CCI_550_ACLK, 21, 0, 0), + CLK_CON_GAT_GOUT_CORE_CCI_550_ACLK, 21, CLK_IS_CRITICAL, 0), + /* GIC (interrupt controller) clock must be always running */ GATE(CLK_GOUT_GIC_CLK, "gout_gic_clk", "mout_core_gic", - CLK_CON_GAT_GOUT_CORE_GIC_CLK, 21, 0, 0), + CLK_CON_GAT_GOUT_CORE_GIC_CLK, 21, CLK_IS_CRITICAL, 0), GATE(CLK_GOUT_MMC_EMBD_ACLK, "gout_mmc_embd_aclk", "dout_core_busp", CLK_CON_GAT_GOUT_CORE_MMC_EMBD_I_ACLK, 21, 0, 0), GATE(CLK_GOUT_MMC_EMBD_SDCLKIN, "gout_mmc_embd_sdclkin", @@ -1023,8 +1028,10 @@ static const struct samsung_div_clock dpu_div_clks[] __initconst = { }; static const struct samsung_gate_clock dpu_gate_clks[] __initconst = { + /* TODO: Should be enabled in DSIM driver */ GATE(CLK_GOUT_DPU_CMU_DPU_PCLK, "gout_dpu_cmu_dpu_pclk", - "dout_dpu_busp", CLK_CON_GAT_CLK_DPU_CMU_DPU_PCLK, 21, 0, 0), + "dout_dpu_busp", + CLK_CON_GAT_CLK_DPU_CMU_DPU_PCLK, 21, CLK_IGNORE_UNUSED, 0), GATE(CLK_GOUT_DPU_DECON0_ACLK, "gout_dpu_decon0_aclk", "mout_dpu_user", CLK_CON_GAT_GOUT_DPU_ACLK_DECON0, 21, 0, 0), GATE(CLK_GOUT_DPU_DMA_ACLK, "gout_dpu_dma_aclk", "mout_dpu_user",