From 875e8f6b0156c0ad56fd0c29c78e3f2f67ec0b16 Mon Sep 17 00:00:00 2001 From: Sergei Shtylyov Date: Tue, 22 Jan 2019 22:58:38 +0300 Subject: clk: renesas: rcar-gen3: Add spinlock Protect the CPG register read-modify-write sequence with a spinlock. Signed-off-by: Sergei Shtylyov Signed-off-by: Geert Uytterhoeven --- drivers/clk/renesas/rcar-gen3-cpg.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'drivers/clk/renesas/rcar-gen3-cpg.c') diff --git a/drivers/clk/renesas/rcar-gen3-cpg.c b/drivers/clk/renesas/rcar-gen3-cpg.c index 80d0808a7fe8..0818691253af 100644 --- a/drivers/clk/renesas/rcar-gen3-cpg.c +++ b/drivers/clk/renesas/rcar-gen3-cpg.c @@ -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; } -- cgit v1.2.3