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clocksource: samsung_pwm_timer: Correct definition of AUTORELOAD bit

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PWM channel 4 has its autoreload bit located at different position. This
patch fixes the driver to account for that.

This fixes a problem with the clocksource hanging after it overflows because
it is not reloaded any more.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Mark Brown <broonie@linaro.org>
Tested-by: Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Tomasz Figa 2013-06-17 02:10:24 +02:00
parent e24154896e
commit ceea124103
1 changed files with 12 additions and 1 deletions
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13
drivers/clocksource/samsung_pwm_timer.c
View file

@ -44,10 +44,21 @@
#define TCFG1_SHIFT(x) ((x) * 4)
#define TCFG1_MUX_MASK 0xf
/*
* Each channel occupies 4 bits in TCON register, but there is a gap of 4
* bits (one channel) after channel 0, so channels have different numbering
* when accessing TCON register.
*
* In addition, the location of autoreload bit for channel 4 (TCON channel 5)
* in its set of bits is 2 as opposed to 3 for other channels.
*/
#define TCON_START(chan) (1 << (4 * (chan) + 0))
#define TCON_MANUALUPDATE(chan) (1 << (4 * (chan) + 1))
#define TCON_INVERT(chan) (1 << (4 * (chan) + 2))
#define TCON_AUTORELOAD(chan) (1 << (4 * (chan) + 3))
#define _TCON_AUTORELOAD(chan) (1 << (4 * (chan) + 3))
#define _TCON_AUTORELOAD4(chan) (1 << (4 * (chan) + 2))
#define TCON_AUTORELOAD(chan) \
((chan < 5) ? _TCON_AUTORELOAD(chan) : _TCON_AUTORELOAD4(chan))
DEFINE_SPINLOCK(samsung_pwm_lock);
EXPORT_SYMBOL(samsung_pwm_lock);