From patchwork Mon May 11 01:27:25 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krzysztof Kozlowski X-Patchwork-Id: 6372391 Return-Path: X-Original-To: patchwork-linux-samsung-soc@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 1A713BEEE1 for ; Mon, 11 May 2015 01:27:50 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 0A6A9203DA for ; Mon, 11 May 2015 01:27:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 72E4A203E1 for ; Mon, 11 May 2015 01:27:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752199AbbEKB1q (ORCPT ); Sun, 10 May 2015 21:27:46 -0400 Received: from mailout2.w1.samsung.com ([210.118.77.12]:57329 "EHLO mailout2.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752033AbbEKB1p (ORCPT ); Sun, 10 May 2015 21:27:45 -0400 Received: from eucpsbgm2.samsung.com (unknown [203.254.199.245]) by mailout2.w1.samsung.com (Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5 2014)) with ESMTP id <0NO5002ODW26W160@mailout2.w1.samsung.com>; Mon, 11 May 2015 02:27:42 +0100 (BST) X-AuditID: cbfec7f5-f794b6d000001495-0c-5550058d8d7b Received: from eusync3.samsung.com ( [203.254.199.213]) by eucpsbgm2.samsung.com (EUCPMTA) with SMTP id E2.19.05269.D8500555; Mon, 11 May 2015 02:27:41 +0100 (BST) Received: from localhost.localdomain ([10.252.80.64]) by eusync3.samsung.com (Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5 2014)) with ESMTPA id <0NO500N81W1Z2M10@eusync3.samsung.com>; Mon, 11 May 2015 02:27:41 +0100 (BST) From: Krzysztof Kozlowski To: Kukjin Kim , linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Bartlomiej Zolnierkiewicz , Chanwoo Choi , Krzysztof Kozlowski , stable@vger.kernel.org Subject: [PATCH v3 1/2] ARM: EXYNOS: Fix failed second suspend on Exynos4 Date: Mon, 11 May 2015 10:27:25 +0900 Message-id: <1431307646-10779-1-git-send-email-k.kozlowski@samsung.com> X-Mailer: git-send-email 1.9.1 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrFJMWRmVeSWpSXmKPExsVy+t/xq7q9rAGhBlu36lhsnLGe1eL6l+es Fq9fGFr0P37NbLHp8TVWi8u75rBZzDi/j8liwcZHjA4cHptWdbJ5bF5S79G3ZRWjx+dNcgEs UVw2Kak5mWWpRfp2CVwZHWvLC1YZV1y5dJO1gXG9VhcjJ4eEgInE9nlLWSBsMYkL99azdTFy cQgJLGWUWLrvEROE859R4s7hP8wgVWwCxhKbly8BqxIR6GKUmLXlN5jDLLCSUeLI/O9gs4QF PCUOdB0B6uDgYBFQleiYKAYS5hVwl1g37wE7xDo5iZPHJrNOYORewMiwilE0tTS5oDgpPddI rzgxt7g0L10vOT93EyMkRL7uYFx6zOoQowAHoxIP74pDfqFCrIllxZW5hxglOJiVRHjNvvmH CvGmJFZWpRblxxeV5qQWH2KU5mBREueduet9iJBAemJJanZqakFqEUyWiYNTqoHxlH5b4zoH u69XDJKPGF8SPnVbcFPTN4d1VpUn57Zt+byjsGZ1XLYW65lKgZSTdhPdtHZxrGTMF3W022Mu tfWubveaeapWrhK81wwtMi1XXU7emtA0qW/bnTm7LZJubTD86tu84NEflydX6i9PO/q1dXlT jfjBvb+mlOubJWr73JBgqLaw82BTYinOSDTUYi4qTgQAHxNf/w0CAAA= Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP On Exynos4412 boards (Trats2, Odroid U3) after enabling L2 cache in 56b60b8bce4a ("ARM: 8265/1: dts: exynos4: Add nodes for L2 cache controller") the second suspend to RAM failed. First suspend worked fine but the next one hang just after powering down of secondary CPUs (system consumed energy as it would be running but was not responsive). The issue was caused by enabling delayed reset assertion for CPU0 just after issuing power down of cores. This was introduced for Exynos4 in 13cfa6c4f7fa ("ARM: EXYNOS: Fix CPU idle clock down after CPU off"). The whole behavior is not well documented but after checking with vendor code this should be done like this (on Exynos4): 1. Enable delayed reset assertion when system is running (for all CPUs). 2. Disable delayed reset assertion before suspending the system. This can be done after powering off secondary CPUs. 3. Re-enable the delayed reset assertion when system is resumed. Signed-off-by: Krzysztof Kozlowski Fixes: 13cfa6c4f7fa ("ARM: EXYNOS: Fix CPU idle clock down after CPU off") Cc: Tested-by: Bartlomiej Zolnierkiewicz Tested-by: Chanwoo Choi --- Changes since v2: None. --- arch/arm/mach-exynos/common.h | 2 ++ arch/arm/mach-exynos/exynos.c | 27 +++++++++++++++++++++++++++ arch/arm/mach-exynos/platsmp.c | 39 ++------------------------------------- arch/arm/mach-exynos/suspend.c | 3 +++ 4 files changed, 34 insertions(+), 37 deletions(-) diff --git a/arch/arm/mach-exynos/common.h b/arch/arm/mach-exynos/common.h index acd5b560b728..5f5cd562c593 100644 --- a/arch/arm/mach-exynos/common.h +++ b/arch/arm/mach-exynos/common.h @@ -159,6 +159,8 @@ extern void exynos_enter_aftr(void); extern struct cpuidle_exynos_data cpuidle_coupled_exynos_data; +extern void exynos_set_delayed_reset_assertion(bool enable); + extern void s5p_init_cpu(void __iomem *cpuid_addr); extern unsigned int samsung_rev(void); extern void __iomem *cpu_boot_reg_base(void); diff --git a/arch/arm/mach-exynos/exynos.c b/arch/arm/mach-exynos/exynos.c index bcde0dd668df..c3bfbba3006d 100644 --- a/arch/arm/mach-exynos/exynos.c +++ b/arch/arm/mach-exynos/exynos.c @@ -167,6 +167,33 @@ static void __init exynos_init_io(void) } /* + * Set or clear the USE_DELAYED_RESET_ASSERTION option. Used by smp code + * and suspend. + * + * This is necessary only on Exynos4 SoCs. When system is running + * USE_DELAYED_RESET_ASSERTION should be set so the ARM CLK clock down + * feature could properly detect global idle state when secondary CPU is + * powered down. + * + * However this should not be set when such system is going into suspend. + */ +void exynos_set_delayed_reset_assertion(bool enable) +{ + if (soc_is_exynos4()) { + unsigned int tmp, core_id; + + for (core_id = 0; core_id < num_possible_cpus(); core_id++) { + tmp = pmu_raw_readl(EXYNOS_ARM_CORE_OPTION(core_id)); + if (enable) + tmp |= S5P_USE_DELAYED_RESET_ASSERTION; + else + tmp &= ~(S5P_USE_DELAYED_RESET_ASSERTION); + pmu_raw_writel(tmp, EXYNOS_ARM_CORE_OPTION(core_id)); + } + } +} + +/* * Apparently, these SoCs are not able to wake-up from suspend using * the PMU. Too bad. Should they suddenly become capable of such a * feat, the matches below should be moved to suspend.c. diff --git a/arch/arm/mach-exynos/platsmp.c b/arch/arm/mach-exynos/platsmp.c index ebd135bb0995..a825bca2a2b6 100644 --- a/arch/arm/mach-exynos/platsmp.c +++ b/arch/arm/mach-exynos/platsmp.c @@ -34,30 +34,6 @@ extern void exynos4_secondary_startup(void); -/* - * Set or clear the USE_DELAYED_RESET_ASSERTION option, set on Exynos4 SoCs - * during hot-(un)plugging CPUx. - * - * The feature can be cleared safely during first boot of secondary CPU. - * - * Exynos4 SoCs require setting USE_DELAYED_RESET_ASSERTION during powering - * down a CPU so the CPU idle clock down feature could properly detect global - * idle state when CPUx is off. - */ -static void exynos_set_delayed_reset_assertion(u32 core_id, bool enable) -{ - if (soc_is_exynos4()) { - unsigned int tmp; - - tmp = pmu_raw_readl(EXYNOS_ARM_CORE_OPTION(core_id)); - if (enable) - tmp |= S5P_USE_DELAYED_RESET_ASSERTION; - else - tmp &= ~(S5P_USE_DELAYED_RESET_ASSERTION); - pmu_raw_writel(tmp, EXYNOS_ARM_CORE_OPTION(core_id)); - } -} - #ifdef CONFIG_HOTPLUG_CPU static inline void cpu_leave_lowpower(u32 core_id) { @@ -73,8 +49,6 @@ static inline void cpu_leave_lowpower(u32 core_id) : "=&r" (v) : "Ir" (CR_C), "Ir" (0x40) : "cc"); - - exynos_set_delayed_reset_assertion(core_id, false); } static inline void platform_do_lowpower(unsigned int cpu, int *spurious) @@ -87,14 +61,6 @@ static inline void platform_do_lowpower(unsigned int cpu, int *spurious) /* Turn the CPU off on next WFI instruction. */ exynos_cpu_power_down(core_id); - /* - * Exynos4 SoCs require setting - * USE_DELAYED_RESET_ASSERTION so the CPU idle - * clock down feature could properly detect - * global idle state when CPUx is off. - */ - exynos_set_delayed_reset_assertion(core_id, true); - wfi(); if (pen_release == core_id) { @@ -371,9 +337,6 @@ static int exynos_boot_secondary(unsigned int cpu, struct task_struct *idle) udelay(10); } - /* No harm if this is called during first boot of secondary CPU */ - exynos_set_delayed_reset_assertion(core_id, false); - /* * now the secondary core is starting up let it run its * calibrations, then wait for it to finish @@ -420,6 +383,8 @@ static void __init exynos_smp_prepare_cpus(unsigned int max_cpus) exynos_sysram_init(); + exynos_set_delayed_reset_assertion(true); + if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9) scu_enable(scu_base_addr()); diff --git a/arch/arm/mach-exynos/suspend.c b/arch/arm/mach-exynos/suspend.c index 3e6aea7f83af..6fcc1fef695c 100644 --- a/arch/arm/mach-exynos/suspend.c +++ b/arch/arm/mach-exynos/suspend.c @@ -342,6 +342,8 @@ static void exynos_pm_enter_sleep_mode(void) static void exynos_pm_prepare(void) { + exynos_set_delayed_reset_assertion(false); + /* Set wake-up mask registers */ exynos_pm_set_wakeup_mask(); @@ -482,6 +484,7 @@ early_wakeup: /* Clear SLEEP mode set in INFORM1 */ pmu_raw_writel(0x0, S5P_INFORM1); + exynos_set_delayed_reset_assertion(true); } static void exynos3250_pm_resume(void)