From 12706c542574ea0127a13815efe59ca9ba6d88d7 Mon Sep 17 00:00:00 2001 From: Paul Walmsley Date: Sun, 10 Jul 2011 05:57:06 -0600 Subject: [PATCH] OMAP2+: clock: allow per-SoC clock init code to prevent clockdomain calls from clock code MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The OMAP2/3 clock code was written to notify the clockdomain code when the first clock in a clockdomain is enabled and when the last enabled clock in a clockdomain is disabled. OMAP4 requires a different approach: the hwmod code needs to signal the clockdomain code when to force-enable and auto-idle a clockdomain during the IP block enable process. The current conjecture is that once that hwmod sequence is implemented, it will no longer be necessary for the clock code to call into the clockdomain code for "optional clocks" on OMAP4. Add a static flag to the OMAP2+ clock code, clkdm_control, that by default preserves the OMAP2/3 behavior. Also add a function, omap2_clk_disable_clkdm_control(), intended to be called from OMAP4 and beyond clock initcalls, that disables the old behavior. Part of this patch was originally based on a patch by Rajendra Nayak . Signed-off-by: Paul Walmsley Cc: Benoît Cousson Cc: Rajendra Nayak --- arch/arm/mach-omap2/clock.c | 27 ++++++++++++++++++++++++--- arch/arm/mach-omap2/clock.h | 3 +++ 2 files changed, 27 insertions(+), 3 deletions(-) diff --git a/arch/arm/mach-omap2/clock.c b/arch/arm/mach-omap2/clock.c index 180299e4a838..fc845767e8d4 100644 --- a/arch/arm/mach-omap2/clock.c +++ b/arch/arm/mach-omap2/clock.c @@ -37,6 +37,14 @@ u8 cpu_mask; +/* + * clkdm_control: if true, then when a clock is enabled in the + * hardware, its clockdomain will first be enabled; and when a clock + * is disabled in the hardware, its clockdomain will be disabled + * afterwards. + */ +static bool clkdm_control = true; + /* * OMAP2+ specific clock functions */ @@ -99,6 +107,19 @@ void omap2_init_clk_clkdm(struct clk *clk) } } +/** + * omap2_clk_disable_clkdm_control - disable clkdm control on clk enable/disable + * + * Prevent the OMAP clock code from calling into the clockdomain code + * when a hardware clock in that clockdomain is enabled or disabled. + * Intended to be called at init time from omap*_clk_init(). No + * return value. + */ +void __init omap2_clk_disable_clkdm_control(void) +{ + clkdm_control = false; +} + /** * omap2_clk_dflt_find_companion - find companion clock to @clk * @clk: struct clk * to find the companion clock of @@ -268,7 +289,7 @@ void omap2_clk_disable(struct clk *clk) clk->ops->disable(clk); } - if (clk->clkdm) + if (clkdm_control && clk->clkdm) clkdm_clk_disable(clk->clkdm, clk); if (clk->parent) @@ -308,7 +329,7 @@ int omap2_clk_enable(struct clk *clk) } } - if (clk->clkdm) { + if (clkdm_control && clk->clkdm) { ret = clkdm_clk_enable(clk->clkdm, clk); if (ret) { WARN(1, "clock: %s: could not enable clockdomain %s: " @@ -330,7 +351,7 @@ int omap2_clk_enable(struct clk *clk) return 0; oce_err3: - if (clk->clkdm) + if (clkdm_control && clk->clkdm) clkdm_clk_disable(clk->clkdm, clk); oce_err2: if (clk->parent) diff --git a/arch/arm/mach-omap2/clock.h b/arch/arm/mach-omap2/clock.h index e10ff2b54844..48ac568881bd 100644 --- a/arch/arm/mach-omap2/clock.h +++ b/arch/arm/mach-omap2/clock.h @@ -16,6 +16,8 @@ #ifndef __ARCH_ARM_MACH_OMAP2_CLOCK_H #define __ARCH_ARM_MACH_OMAP2_CLOCK_H +#include + #include /* CM_CLKSEL2_PLL.CORE_CLK_SRC bits (2XXX) */ @@ -72,6 +74,7 @@ void omap2_clk_disable_unused(struct clk *clk); #endif void omap2_init_clk_clkdm(struct clk *clk); +void __init omap2_clk_disable_clkdm_control(void); /* clkt_clksel.c public functions */ u32 omap2_clksel_round_rate_div(struct clk *clk, unsigned long target_rate, -- 2.34.1