From: ccross@android.com (Colin Cross)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 05/21] ARM: tegra: clock: Disable clocks left on by bootloader
Date: Sat, 19 Feb 2011 14:25:54 -0800 [thread overview]
Message-ID: <1298154371-5641-7-git-send-email-ccross@android.com> (raw)
In-Reply-To: <1298154371-5641-1-git-send-email-ccross@android.com>
Adds CONFIG_TEGRA_DISABLE_BOOTLOADER_CLOCKS that iterates
through all clocks, disabling any for which the refcount
is 0 but the clock init detected the bootloader left the
clock on.
Signed-off-by: Colin Cross <ccross@android.com>
---
arch/arm/mach-tegra/Kconfig | 6 ++++++
arch/arm/mach-tegra/clock.c | 30 ++++++++++++++++++++++++++++++
2 files changed, 36 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-tegra/Kconfig b/arch/arm/mach-tegra/Kconfig
index f0fda77..9f4fc6b 100644
--- a/arch/arm/mach-tegra/Kconfig
+++ b/arch/arm/mach-tegra/Kconfig
@@ -57,6 +57,12 @@ config TEGRA_DEBUG_UARTE
endchoice
+config TEGRA_DISABLE_BOOTLOADER_CLOCKS
+ bool "Disable clocks left on by bootloader"
+ help
+ Disables clocks that are detected to be on but haven't
+ been requested by a kernel driver.
+
config TEGRA_SYSTEM_DMA
bool "Enable system DMA driver for NVIDIA Tegra SoCs"
default y
diff --git a/arch/arm/mach-tegra/clock.c b/arch/arm/mach-tegra/clock.c
index f55bb83..0ea5d92 100644
--- a/arch/arm/mach-tegra/clock.c
+++ b/arch/arm/mach-tegra/clock.c
@@ -511,6 +511,36 @@ int __init tegra_init_dvfs(void)
late_initcall(tegra_init_dvfs);
+/*
+ * Iterate through all clocks, disabling any for which the refcount is 0
+ * but the clock init detected the bootloader left the clock on.
+ */
+#ifdef CONFIG_TEGRA_DISABLE_BOOTLOADER_CLOCKS
+int __init tegra_disable_boot_clocks(void)
+{
+ unsigned long flags;
+
+ struct clk *c;
+
+ spin_lock_irqsave(&clock_lock, flags);
+
+ list_for_each_entry(c, &clocks, node) {
+ if (c->refcnt == 0 && c->state == ON &&
+ c->ops && c->ops->disable) {
+ pr_warning("Disabling clock %s left on by bootloader\n",
+ c->name);
+ c->ops->disable(c);
+ c->state = OFF;
+ }
+ }
+
+ spin_unlock_irqrestore(&clock_lock, flags);
+
+ return 0;
+}
+late_initcall(tegra_disable_boot_clocks);
+#endif
+
#ifdef CONFIG_DEBUG_FS
static struct dentry *clk_debugfs_root;
--
1.7.3.1
next prev parent reply other threads:[~2011-02-19 22:25 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-19 22:25 [PATCH v2 12/21] ARM: tegra: clock: Add shared bus clock type Colin Cross
2011-02-19 22:25 ` [PATCH v2 00/21] Tegra clock updates for 2.6.39 Colin Cross
2011-02-19 22:25 ` [PATCH v2 01/21] ARM: tegra: clock: enable clk reset for non-peripheral clocks Colin Cross
2011-02-21 4:05 ` Olof Johansson
2011-02-19 22:25 ` [PATCH v2 02/21] ARM: tegra: clock: Don't BUG on changing an enabled PLL Colin Cross
2011-02-21 4:06 ` Olof Johansson
2011-02-21 6:46 ` Colin Cross
2011-02-19 22:25 ` [PATCH v2 03/21] ARM: tegra: clock: Drop debugging Colin Cross
2011-02-21 4:07 ` Olof Johansson
2011-02-21 6:56 ` Colin Cross
2011-02-19 22:25 ` [PATCH v2 04/21] ARM: tegra: clock: Don't use PLL lock bits Colin Cross
2011-02-21 4:07 ` Olof Johansson
2011-02-19 22:25 ` Colin Cross [this message]
2011-02-21 0:40 ` [PATCH v2 05/21] ARM: tegra: clock: Disable clocks left on by bootloader Olof Johansson
2011-02-21 3:43 ` Colin Cross
2011-02-21 4:03 ` Olof Johansson
2011-02-19 22:25 ` [PATCH v2 06/21] ARM: tegra: clock: Initialize clocks that have no enable Colin Cross
2011-02-21 4:08 ` Olof Johansson
2011-02-19 22:25 ` [PATCH v2 07/21] ARM: tegra: clock: Drop CPU dvfs Colin Cross
2011-02-21 4:09 ` Olof Johansson
2011-02-19 22:25 ` [PATCH v2 08/21] ARM: tegra: clock: Rearrange static clock tables Colin Cross
2011-02-21 4:09 ` Olof Johansson
2011-02-19 22:25 ` [PATCH v2 09/21] ARM: tegra: clock: Move unshared clk struct members into union Colin Cross
2011-02-21 4:10 ` Olof Johansson
2011-02-21 7:00 ` Colin Cross
2011-02-19 22:25 ` [PATCH v2 10/21] ARM: tegra: clock: Convert global lock to a lock per clock Colin Cross
2011-02-21 4:11 ` Olof Johansson
2011-02-19 22:26 ` [PATCH v2 11/21] ARM: tegra: cpufreq: Take an extra reference to pllx Colin Cross
2011-02-21 4:12 ` Olof Johansson
2011-02-19 22:26 ` [PATCH v2 12/21] ARM: tegra: clock: Add shared bus clock type Colin Cross
2011-02-19 22:26 ` [PATCH v2 13/21] ARM: tegra: clock: Remove unnecessary uses of #ifdef CONFIG_DEBUG_FS Colin Cross
2011-02-21 4:17 ` Olof Johansson
2011-02-19 22:26 ` [PATCH v2 14/21] ARM: tegra: clock: Refcount periph clock enables Colin Cross
2011-02-21 4:18 ` Olof Johansson
2011-02-21 7:06 ` Colin Cross
2011-02-19 22:26 ` [PATCH v2 15/21] ARM: tegra: clock: Round rate before setting rate Colin Cross
2011-02-21 4:19 ` Olof Johansson
2011-02-21 7:52 ` Colin Cross
2011-02-19 22:26 ` [PATCH v2 16/21] ARM: tegra: Add external memory controller driver Colin Cross
2011-02-21 4:20 ` Olof Johansson
2011-02-19 22:26 ` [PATCH v2 17/21] ARM: tegra: clocks: Add emc scaling Colin Cross
2011-02-21 4:21 ` Olof Johansson
2011-02-19 22:26 ` [PATCH v2 18/21] ARM: tegra: cpufreq: Adjust memory frequency with cpu frequency Colin Cross
2011-02-21 4:23 ` Olof Johansson
2011-02-19 22:26 ` [PATCH v2 19/21] ARM: tegra: clock: Add function to set SDMMC tap delay Colin Cross
2011-02-21 4:26 ` Olof Johansson
2011-02-19 22:26 ` [PATCH v2 20/21] ARM: tegra: clock: Fix clock issues in suspend Colin Cross
2011-02-21 4:28 ` Olof Johansson
2011-02-19 22:26 ` [PATCH v2 21/21] ARM: tegra: clock: Miscellaneous clock updates Colin Cross
2011-02-21 4:28 ` Olof Johansson
2011-02-21 4:15 ` [PATCH v2 12/21] ARM: tegra: clock: Add shared bus clock type Olof Johansson
2011-02-21 7:02 ` Colin Cross
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