Iterates through all clocks, disabling any for which the refcount is 0 but the clock init detected the bootloader left the clock on. Can be disabled with command line tegra_keep_boot_clocks
Signed-off-by: Colin Cross <[email protected]> --- arch/arm/mach-tegra/clock.c | 45 +++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 45 insertions(+), 0 deletions(-) diff --git a/arch/arm/mach-tegra/clock.c b/arch/arm/mach-tegra/clock.c index e028320..6a50726 100644 --- a/arch/arm/mach-tegra/clock.c +++ b/arch/arm/mach-tegra/clock.c @@ -416,6 +416,51 @@ void tegra_sdmmc_tap_delay(struct clk *c, int delay) spin_unlock_irqrestore(&c->spinlock, flags); } +static bool tegra_keep_boot_clocks = false; +static int __init tegra_keep_boot_clocks_setup(char *__unused) +{ + tegra_keep_boot_clocks = true; + return 1; +} +__setup("tegra_keep_boot_clocks", tegra_keep_boot_clocks_setup); + +/* + * Iterate through all clocks, disabling any for which the refcount is 0 + * but the clock init detected the bootloader left the clock on. + */ +static int __init tegra_init_disable_boot_clocks(void) +{ + struct clk *c; + + mutex_lock(&clock_list_lock); + + list_for_each_entry(c, &clocks, node) { + spin_lock_irq(&c->spinlock); + + if (c->refcnt == 0 && c->state == ON && + c->ops && c->ops->disable) { + pr_warn_once("%s clocks left on by bootloader:\n", + tegra_keep_boot_clocks ? + "Prevented disabling" : + "Disabling"); + + pr_warn(" %s\n", c->name); + + if (!tegra_keep_boot_clocks) { + c->ops->disable(c); + c->state = OFF; + } + } + + spin_unlock_irq(&c->spinlock); + } + + mutex_unlock(&clock_list_lock); + + return 0; +} +late_initcall(tegra_init_disable_boot_clocks); + #ifdef CONFIG_DEBUG_FS static int __clk_lock_all_spinlocks(void) -- 1.7.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
