Commit 8bf27eaa authored by Marek Szyprowski's avatar Marek Szyprowski Committed by Sylwester Nawrocki
Browse files

clk: samsung: Add support for setting registers state before suspend 



Some registers of clock controller have to be set to certain values before
entering system suspend state. Till now drivers did that on their own,
but it will be easier to handle it by generic code and let drivers simply
to provide the list of registers and their state.

Signed-off-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: default avatarSylwester Nawrocki <snawrocki@kernel.org>
parent c41b0ff2

drivers/clk/samsung/clk.c

+13 −10
Original line number Diff line number Diff line
@@ -290,9 +290,12 @@ static int samsung_clk_suspend(void) 
{

	struct samsung_clock_reg_cache *reg_cache;



	list_for_each_entry(reg_cache, &clock_reg_cache_list, node)

	list_for_each_entry(reg_cache, &clock_reg_cache_list, node) {

		samsung_clk_save(reg_cache->reg_base, reg_cache->rdump,

				reg_cache->rd_num);

		samsung_clk_restore(reg_cache->reg_base, reg_cache->rsuspend,

				reg_cache->rsuspend_num);

	}

	return 0;

}
@@ -310,9 +313,11 @@ static struct syscore_ops samsung_clk_syscore_ops = { 
	.resume = samsung_clk_resume,

};



void samsung_clk_sleep_init(void __iomem *reg_base,

void samsung_clk_extended_sleep_init(void __iomem *reg_base,

			const unsigned long *rdump,

			unsigned long nr_rdump)

			unsigned long nr_rdump,

			const struct samsung_clk_reg_dump *rsuspend,

			unsigned long nr_rsuspend)

{

	struct samsung_clock_reg_cache *reg_cache;
@@ -330,13 +335,10 @@ void samsung_clk_sleep_init(void __iomem *reg_base, 


	reg_cache->reg_base = reg_base;

	reg_cache->rd_num = nr_rdump;

	reg_cache->rsuspend = rsuspend;

	reg_cache->rsuspend_num = nr_rsuspend;

	list_add_tail(&reg_cache->node, &clock_reg_cache_list);

}



#else

void samsung_clk_sleep_init(void __iomem *reg_base,

			const unsigned long *rdump,

			unsigned long nr_rdump) {}

#endif



/*
@@ -380,8 +382,9 @@ struct samsung_clk_provider * __init samsung_cmu_register_one( 
		samsung_clk_register_fixed_factor(ctx, cmu->fixed_factor_clks,

			cmu->nr_fixed_factor_clks);

	if (cmu->clk_regs)

		samsung_clk_sleep_init(reg_base, cmu->clk_regs,

			cmu->nr_clk_regs);

		samsung_clk_extended_sleep_init(reg_base,

			cmu->clk_regs, cmu->nr_clk_regs,

			cmu->suspend_regs, cmu->nr_suspend_regs);



	samsung_clk_of_add_provider(np, ctx);

drivers/clk/samsung/clk.h

+16 −2
Original line number Diff line number Diff line
@@ -279,6 +279,8 @@ struct samsung_clock_reg_cache { 
	void __iomem *reg_base;

	struct samsung_clk_reg_dump *rdump;

	unsigned int rd_num;

	const struct samsung_clk_reg_dump *rsuspend;

	unsigned int rsuspend_num;

};



struct samsung_cmu_info {
@@ -358,9 +360,21 @@ extern struct samsung_clk_provider __init *samsung_cmu_register_one( 


extern unsigned long _get_rate(const char *clk_name);



extern void samsung_clk_sleep_init(void __iomem *reg_base,

#ifdef CONFIG_PM_SLEEP

extern void samsung_clk_extended_sleep_init(void __iomem *reg_base,

			const unsigned long *rdump,

			unsigned long nr_rdump);

			unsigned long nr_rdump,

			const struct samsung_clk_reg_dump *rsuspend,

			unsigned long nr_rsuspend);

#else

static inline void samsung_clk_extended_sleep_init(void __iomem *reg_base,

			const unsigned long *rdump,

			unsigned long nr_rdump,

			const struct samsung_clk_reg_dump *rsuspend,

			unsigned long nr_rsuspend) {}

#endif

#define samsung_clk_sleep_init(reg_base, rdump, nr_rdump) \

	samsung_clk_extended_sleep_init(reg_base, rdump, nr_rdump, NULL, 0)



extern void samsung_clk_save(void __iomem *base,

			struct samsung_clk_reg_dump *rd,

CRA Git | Maintained and supported by SUSTech CRA and CCSE