diff options
| author | Tomasz Figa <tomasz.figa@gmail.com> | 2013-06-17 04:10:24 +0400 |
|---|---|---|
| committer | Tomasz Figa <tomasz.figa@gmail.com> | 2013-08-06 03:21:41 +0400 |
| commit | ceea124103c6f00561491b45133be5ccefc8ea1d (patch) | |
| tree | 1e6dbd59c3f6e82d6337567de108c9a64dc8cb2d /drivers/clocksource/samsung_pwm_timer.c | |
| parent | e24154896e2f60b0c20bda492d662ad77ffa5c32 (diff) | |
| download | linux-ceea124103c6f00561491b45133be5ccefc8ea1d.tar.xz | |
clocksource: samsung_pwm_timer: Correct definition of AUTORELOAD bit
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>
Diffstat (limited to 'drivers/clocksource/samsung_pwm_timer.c')
| -rw-r--r-- | drivers/clocksource/samsung_pwm_timer.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/clocksource/samsung_pwm_timer.c b/drivers/clocksource/samsung_pwm_timer.c index 3fa5b07fa50d..5d0049f07af4 100644 --- a/drivers/clocksource/samsung_pwm_timer.c +++ b/drivers/clocksource/samsung_pwm_timer.c @@ -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); |