From: Ladislav Michl <ladis@linux-mips.org>
To: linux-omap@vger.kernel.org, linux-pwm@vger.kernel.org
Cc: t-kristo@ti.com, grygorii.strashko@ti.com, aaro.koskinen@iki.fi,
tony@atomide.com, Keerthy <j-keerthy@ti.com>,
daniel.lezcano@linaro.org, linux-kernel@vger.kernel.org,
robh+dt@kernel.org, narmstrong@baylibre.com,
thierry.reding@gmail.com, sebastian.reichel@collabora.co.uk,
Claudiu.Beznea@microchip.com,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/3] clocksource: timer-dm: Check prescaler value
Date: Wed, 17 Jan 2018 22:47:14 +0100 [thread overview]
Message-ID: <20180117214714.GB11952@lenoch> (raw)
In-Reply-To: <20180117214629.GA11952@lenoch>
Invalid value silently disables use of the prescaler.
Use -1 explicitely for that purpose and error out on
invalid value.
Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
---
drivers/clocksource/timer-dm.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/clocksource/timer-dm.c b/drivers/clocksource/timer-dm.c
index 60db1734ea3b..324ec93d3dd2 100644
--- a/drivers/clocksource/timer-dm.c
+++ b/drivers/clocksource/timer-dm.c
@@ -663,13 +663,13 @@ int omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler)
{
u32 l;
- if (unlikely(!timer))
+ if (unlikely(!timer) || prescaler < -1 || prescaler > 7)
return -EINVAL;
omap_dm_timer_enable(timer);
l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
l &= ~(OMAP_TIMER_CTRL_PRE | (0x07 << 2));
- if (prescaler >= 0x00 && prescaler <= 0x07) {
+ if (prescaler >= 0) {
l |= OMAP_TIMER_CTRL_PRE;
l |= prescaler << 2;
}
next prev parent reply other threads:[~2018-01-17 21:47 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-17 21:46 [PATCH 0/3] omap: dmtimer: Fix and cleanup moved driver Ladislav Michl
2018-01-17 21:47 ` Ladislav Michl [this message]
2018-01-22 9:00 ` [PATCH 1/3] clocksource: timer-dm: Check prescaler value Claudiu Beznea
2018-01-22 9:59 ` Ladislav Michl
2018-01-22 10:04 ` Claudiu Beznea
2018-01-17 21:47 ` [PATCH 2/3] pwm: pwm-omap-dmtimer: Fix frequency when using prescaler Ladislav Michl
2018-01-22 9:17 ` Claudiu Beznea
2018-01-22 10:53 ` Ladislav Michl
2018-01-24 5:26 ` Keerthy
2018-01-24 5:49 ` Keerthy
2018-01-17 21:48 ` [PATCH 3/3] clocksource: timer-dm: Make unexported functions static Ladislav Michl
2018-01-22 9:26 ` Claudiu Beznea
2018-01-22 10:39 ` Ladislav Michl
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