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authorBoris Brezillon <boris.brezillon@free-electrons.com>2015-08-16 11:23:46 +0200
committerAlexandre Belloni <alexandre.belloni@free-electrons.com>2015-10-06 12:33:14 +0200
commit7d8d05d11473a169ab4d53bc7fc23d1fe3f1959f (patch)
treebee4e05c057bad03571e622f911fe391b684515b /drivers/clocksource
parenteed9fb9df47898ea62d71be7dcc3b36d95819a7c (diff)
misc: atmel_tclib: get and use slow clock
Commit dca1a4b5ff6e ("clk: at91: keep slow clk enabled to prevent system hang") added a workaround for the slow clock as it is not properly handled by its users. Get and use the slow clock as it is necessary for the timer counters. Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/clocksource')
-rw-r--r--drivers/clocksource/tcb_clksrc.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/clocksource/tcb_clksrc.c b/drivers/clocksource/tcb_clksrc.c
index f8d11fcf80f1..6ee91401918e 100644
--- a/drivers/clocksource/tcb_clksrc.c
+++ b/drivers/clocksource/tcb_clksrc.c
@@ -193,10 +193,17 @@ static int __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx)
struct clk *t2_clk = tc->clk[2];
int irq = tc->irq[2];
+ ret = clk_prepare_enable(tc->slow_clk);
+ if (ret)
+ return ret;
+
/* try to enable t2 clk to avoid future errors in mode change */
ret = clk_prepare_enable(t2_clk);
- if (ret)
+ if (ret) {
+ clk_disable_unprepare(tc->slow_clk);
return ret;
+ }
+
clk_disable(t2_clk);
clkevt.regs = tc->regs;
@@ -209,6 +216,7 @@ static int __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx)
ret = request_irq(irq, ch2_irq, IRQF_TIMER, "tc_clkevt", &clkevt);
if (ret) {
clk_unprepare(t2_clk);
+ clk_disable_unprepare(tc->slow_clk);
return ret;
}