From ae68f7af05dbce25889ab10b302fba927dcdb295 Mon Sep 17 00:00:00 2001 From: Shawn Guo Date: Tue, 20 Dec 2011 13:50:11 +0800 Subject: ARM: mxs: convert platform code to clk_prepare/clk_unprepare The patch converts mxs platform code to clk_prepare/clk_unprepare by using helper functions clk_prepare_enable/clk_disable_unprepare. Signed-off-by: Richard Zhao Signed-off-by: Shawn Guo --- arch/arm/mach-mxs/clock-mx23.c | 10 +++++----- arch/arm/mach-mxs/clock-mx28.c | 10 +++++----- arch/arm/mach-mxs/clock.c | 2 +- arch/arm/mach-mxs/mach-mx28evk.c | 2 +- arch/arm/mach-mxs/system.c | 2 +- arch/arm/mach-mxs/timer.c | 2 +- 6 files changed, 14 insertions(+), 14 deletions(-) (limited to 'arch') diff --git a/arch/arm/mach-mxs/clock-mx23.c b/arch/arm/mach-mxs/clock-mx23.c index 0163b6d83773..e12e11231dc7 100644 --- a/arch/arm/mach-mxs/clock-mx23.c +++ b/arch/arm/mach-mxs/clock-mx23.c @@ -545,11 +545,11 @@ int __init mx23_clocks_init(void) */ clk_set_parent(&ssp_clk, &ref_io_clk); - clk_enable(&cpu_clk); - clk_enable(&hbus_clk); - clk_enable(&xbus_clk); - clk_enable(&emi_clk); - clk_enable(&uart_clk); + clk_prepare_enable(&cpu_clk); + clk_prepare_enable(&hbus_clk); + clk_prepare_enable(&xbus_clk); + clk_prepare_enable(&emi_clk); + clk_prepare_enable(&uart_clk); clkdev_add_table(lookups, ARRAY_SIZE(lookups)); diff --git a/arch/arm/mach-mxs/clock-mx28.c b/arch/arm/mach-mxs/clock-mx28.c index da6e4aad177c..f85f1f5b3e1f 100644 --- a/arch/arm/mach-mxs/clock-mx28.c +++ b/arch/arm/mach-mxs/clock-mx28.c @@ -775,11 +775,11 @@ int __init mx28_clocks_init(void) clk_set_parent(&ssp0_clk, &ref_io0_clk); clk_set_parent(&ssp1_clk, &ref_io0_clk); - clk_enable(&cpu_clk); - clk_enable(&hbus_clk); - clk_enable(&xbus_clk); - clk_enable(&emi_clk); - clk_enable(&uart_clk); + clk_prepare_enable(&cpu_clk); + clk_prepare_enable(&hbus_clk); + clk_prepare_enable(&xbus_clk); + clk_prepare_enable(&emi_clk); + clk_prepare_enable(&uart_clk); clk_set_parent(&lcdif_clk, &ref_pix_clk); clk_set_parent(&saif0_clk, &pll0_clk); diff --git a/arch/arm/mach-mxs/clock.c b/arch/arm/mach-mxs/clock.c index a7093c88e6a6..755eec0b5a89 100644 --- a/arch/arm/mach-mxs/clock.c +++ b/arch/arm/mach-mxs/clock.c @@ -166,7 +166,7 @@ int clk_set_parent(struct clk *clk, struct clk *parent) return ret; if (clk->usecount) - clk_enable(parent); + clk_prepare_enable(parent); mutex_lock(&clocks_mutex); ret = clk->set_parent(clk, parent); diff --git a/arch/arm/mach-mxs/mach-mx28evk.c b/arch/arm/mach-mxs/mach-mx28evk.c index 064ec5abaa55..6b9e83e6e893 100644 --- a/arch/arm/mach-mxs/mach-mx28evk.c +++ b/arch/arm/mach-mxs/mach-mx28evk.c @@ -228,7 +228,7 @@ static void __init mx28evk_fec_reset(void) /* Enable fec phy clock */ clk = clk_get_sys("pll2", NULL); if (!IS_ERR(clk)) - clk_enable(clk); + clk_prepare_enable(clk); /* Power up fec phy */ ret = gpio_request(MX28EVK_FEC_PHY_POWER, "fec-phy-power"); diff --git a/arch/arm/mach-mxs/system.c b/arch/arm/mach-mxs/system.c index 20ec3bddf7cd..9760a1285e0d 100644 --- a/arch/arm/mach-mxs/system.c +++ b/arch/arm/mach-mxs/system.c @@ -66,7 +66,7 @@ static int __init mxs_arch_reset_init(void) clk = clk_get_sys("rtc", NULL); if (!IS_ERR(clk)) - clk_enable(clk); + clk_prepare_enable(clk); return 0; } diff --git a/arch/arm/mach-mxs/timer.c b/arch/arm/mach-mxs/timer.c index cace0d2e5a55..564a63279f18 100644 --- a/arch/arm/mach-mxs/timer.c +++ b/arch/arm/mach-mxs/timer.c @@ -245,7 +245,7 @@ static int __init mxs_clocksource_init(struct clk *timer_clk) void __init mxs_timer_init(struct clk *timer_clk, int irq) { - clk_enable(timer_clk); + clk_prepare_enable(timer_clk); /* * Initialize timers to a known state -- cgit v1.2.3-58-ga151 From 6abda3e129bfe4d74b5c274da7dff0e2b1488818 Mon Sep 17 00:00:00 2001 From: Shawn Guo Date: Tue, 20 Dec 2011 16:12:34 +0800 Subject: ARM: mxs: select HAVE_CLK_PREPARE for clock This patch adds clk_prepare/clk_unprepare for mxs clock api by renaming the existing non-atomic clk_enable/clk_disable to clk_prepare/clk_unprepare and adding a pair of dummy clk_enable/clk_disable. Then with selecting HAVE_CLK_PREPARE for mxs clock, we can fix the mutex locking warning that has been reported for a few times. Signed-off-by: Shawn Guo --- arch/arm/Kconfig | 1 + arch/arm/mach-mxs/clock.c | 31 ++++++++++++++++++++++--------- 2 files changed, 23 insertions(+), 9 deletions(-) (limited to 'arch') diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 776d76b8cb69..dc461637e778 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -442,6 +442,7 @@ config ARCH_MXS select ARCH_REQUIRE_GPIOLIB select CLKDEV_LOOKUP select CLKSRC_MMIO + select HAVE_CLK_PREPARE help Support for Freescale MXS-based family of processors diff --git a/arch/arm/mach-mxs/clock.c b/arch/arm/mach-mxs/clock.c index 755eec0b5a89..97a6f4acc6cc 100644 --- a/arch/arm/mach-mxs/clock.c +++ b/arch/arm/mach-mxs/clock.c @@ -74,10 +74,15 @@ static int __clk_enable(struct clk *clk) return 0; } -/* This function increments the reference count on the clock and enables the - * clock if not already enabled. The parent clock tree is recursively enabled +/* + * The clk_enable/clk_disable could be called by drivers in atomic context, + * so they should not really hold mutex. Instead, clk_prepare/clk_unprepare + * can hold a mutex, as the pair will only be called in non-atomic context. + * Before migrating to common clk framework, we can have __clk_enable and + * __clk_disable called in clk_prepare/clk_unprepare with mutex held and + * leave clk_enable/clk_disable as the dummy functions. */ -int clk_enable(struct clk *clk) +int clk_prepare(struct clk *clk) { int ret = 0; @@ -90,13 +95,9 @@ int clk_enable(struct clk *clk) return ret; } -EXPORT_SYMBOL(clk_enable); +EXPORT_SYMBOL(clk_prepare); -/* This function decrements the reference count on the clock and disables - * the clock when reference count is 0. The parent clock tree is - * recursively disabled - */ -void clk_disable(struct clk *clk) +void clk_unprepare(struct clk *clk) { if (clk == NULL || IS_ERR(clk)) return; @@ -105,6 +106,18 @@ void clk_disable(struct clk *clk) __clk_disable(clk); mutex_unlock(&clocks_mutex); } +EXPORT_SYMBOL(clk_unprepare); + +int clk_enable(struct clk *clk) +{ + return 0; +} +EXPORT_SYMBOL(clk_enable); + +void clk_disable(struct clk *clk) +{ + /* nothing to do */ +} EXPORT_SYMBOL(clk_disable); /* Retrieve the *current* clock rate. If the clock itself -- cgit v1.2.3-58-ga151