Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752692Ab1BVCl1 (ORCPT ); Mon, 21 Feb 2011 21:41:27 -0500 Received: from smtp-out.google.com ([216.239.44.51]:62599 "EHLO smtp-out.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751361Ab1BVClZ (ORCPT ); Mon, 21 Feb 2011 21:41:25 -0500 From: Colin Cross To: linux-tegra@vger.kernel.org Cc: konkers@android.com, olof@lixom.net, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, mike@compulab.co.il, Colin Cross , Russell King Subject: [PATCH 7/7] ARM: tegra: clock: Disable clocks left on by bootloader Date: Mon, 21 Feb 2011 18:39:52 -0800 Message-Id: <1298342392-21236-8-git-send-email-ccross@android.com> X-Mailer: git-send-email 1.7.3.1 In-Reply-To: <1298342392-21236-1-git-send-email-ccross@android.com> References: <1298342392-21236-1-git-send-email-ccross@android.com> X-System-Of-Record: true Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2145 Lines: 80 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_clock.disable_boot_clocks=N Signed-off-by: Colin Cross --- arch/arm/mach-tegra/clock.c | 44 +++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 44 insertions(+), 0 deletions(-) diff --git a/arch/arm/mach-tegra/clock.c b/arch/arm/mach-tegra/clock.c index e028320..6d686ff 100644 --- a/arch/arm/mach-tegra/clock.c +++ b/arch/arm/mach-tegra/clock.c @@ -33,6 +33,9 @@ #include "board.h" #include "clock.h" +#undef MODULE_PARAM_PREFIX +#define MODULE_PARAM_PREFIX "tegra_clock." + /* * Locking: * @@ -416,6 +419,47 @@ void tegra_sdmmc_tap_delay(struct clk *c, int delay) spin_unlock_irqrestore(&c->spinlock, flags); } +static bool tegra_disable_boot_clocks = true; +module_param_named(disable_boot_clocks, tegra_disable_boot_clocks, bool, + S_IRUGO | S_IWUSR | S_IWGRP); + +/* + * 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_disable_boot_clocks ? + "Disabling" : + "Prevented disabling"); + + pr_warn(" %s\n", c->name); + + if (tegra_disable_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-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/