From: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
To: linux-renesas-soc@vger.kernel.org,
Michael Turquette <mturquette@baylibre.com>,
Stephen Boyd <sboyd@codeaurora.org>,
Geert Uytterhoeven <geert+renesas@glider.be>,
linux-clk@vger.kernel.org
Subject: [PATCH v3 2/4] clk: renesas: rcar-gen3-cpg: add spinlock
Date: Tue, 22 Jan 2019 22:58:38 +0300 [thread overview]
Message-ID: <8a630f60-c5a1-de98-f80a-40404199d8bd@cogentembedded.com> (raw)
In-Reply-To: <f1c53dd5-2dc5-9f11-44e3-8e222ed21903@cogentembedded.com>
Protect the CPG register read-modify-write sequence with a spinlock.
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
Changes in version 3:
- refreshed the patch;
- added Geert's tag.
Changes in version 2:
- new patch.
drivers/clk/renesas/rcar-gen3-cpg.c | 8 ++++++++
1 file changed, 8 insertions(+)
Index: renesas-drivers/drivers/clk/renesas/rcar-gen3-cpg.c
===================================================================
--- renesas-drivers.orig/drivers/clk/renesas/rcar-gen3-cpg.c
+++ renesas-drivers/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 stru
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;
}
next prev parent reply other threads:[~2019-01-22 19:58 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-22 19:55 [PATCH v3 0/4] Renesas R8A77980 CPG/MSSR RPC clock support Sergei Shtylyov
2019-01-22 19:57 ` [PATCH v3 1/4] clk: renesas: rcar-gen3-cpg: factor out cpg_reg_modify() Sergei Shtylyov
2019-01-22 19:58 ` Sergei Shtylyov [this message]
2019-01-22 19:59 ` [PATCH v3 3/4] clk: renesas: rcar-gen3-cpg: add RPC clocks Sergei Shtylyov
2019-01-25 10:25 ` Geert Uytterhoeven
2019-01-22 20:01 ` [PATCH v3 4/4] clk: renesas: r8a77980-cpg-mssr: " Sergei Shtylyov
2019-01-25 10:25 ` [PATCH v3 0/4] Renesas R8A77980 CPG/MSSR RPC clock support Geert Uytterhoeven
2019-03-07 19:53 ` [PATCH] clk: renesas: r8a77980-cpg-mssr: fix RPC-IF module clock's parent Sergei Shtylyov
2019-03-11 9:30 ` Geert Uytterhoeven
2019-03-11 17:14 ` Sergei Shtylyov
2019-03-11 19:10 ` Sergei Shtylyov
2019-09-27 18:09 ` [PATCH] clk: renesas: rcar-gen3: allow changing the RPC[D2] clocks Sergei Shtylyov
2019-10-07 11:45 ` Geert Uytterhoeven
2019-10-07 11:49 ` Sergei Shtylyov
2019-12-17 20:43 ` Geert Uytterhoeven
2019-12-18 19:34 ` Sergei Shtylyov
2019-12-20 14:31 ` Geert Uytterhoeven
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