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Commit 875e8f6b authored by Sergei Shtylyov's avatar Sergei Shtylyov Committed by Geert Uytterhoeven
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clk: renesas: rcar-gen3: Add spinlock 



Protect the CPG register read-modify-write sequence with a spinlock.

Signed-off-by: default avatarSergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
parent 8cb8f16c

drivers/clk/renesas/rcar-gen3-cpg.c

+8 −0
Original line number Diff line number Diff line
@@ -30,14 +30,19 @@ 


#define CPG_RCKCR_CKSEL	BIT(15)	/* RCLK Clock Source Select */



static spinlock_t cpg_lock;



static void cpg_reg_modify(void __iomem *reg, u32 clear, u32 set)

{

	unsigned long flags;

	u32 val;



	spin_lock_irqsave(&cpg_lock, flags);

	val = readl(reg);

	val &= ~clear;

	val |= set;

	writel(val, reg);

	spin_unlock_irqrestore(&cpg_lock, flags);

};



struct cpg_simple_notifier {
@@ -615,5 +620,8 @@ int __init rcar_gen3_cpg_init(const struct rcar_gen3_cpg_pll_config *config, 
	if (attr)

		cpg_quirks = (uintptr_t)attr->data;

	pr_debug("%s: mode = 0x%x quirks = 0x%x\n", __func__, mode, cpg_quirks);



	spin_lock_init(&cpg_lock);



	return 0;

}