diff options
| author | Zubair Lutfullah <zubair.lutfullah@gmail.com> | 2013-08-05 19:10:45 (GMT) |
|---|---|---|
| committer | Lee Jones <lee.jones@linaro.org> | 2013-08-14 17:53:03 (GMT) |
| commit | 45491ada9830cd22e386499cbeb7cab2f24a1136 (patch) | |
| tree | 555887d6d4d01558b86a1d825078d8cb9e00f34c /drivers/mfd/ti_am335x_tscadc.c | |
| parent | e293e847275b2d1a4768ca25f0933a70b2383016 (diff) | |
| download | linux-fsl-qoriq-45491ada9830cd22e386499cbeb7cab2f24a1136.tar.xz | |
mfd: ti_am335x_tscadc: Fix spin lock and reg_cache
Reg_cache variable is used to lock step enable register
from being accessed and written by both TSC and ADC
at the same time.
However, it isn't updated anywhere in the code at all.
If both TSC and ADC are used, eventually 1FFFF is always
written enabling all 16 steps uselessly causing a mess.
Patch fixes it by correcting the locks and updates the
variable by reading the step enable register
Signed-off-by: Zubair Lutfullah <zubair.lutfullah@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/mfd/ti_am335x_tscadc.c')
| -rw-r--r-- | drivers/mfd/ti_am335x_tscadc.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c index cd74d59..9f3f07a 100644 --- a/drivers/mfd/ti_am335x_tscadc.c +++ b/drivers/mfd/ti_am335x_tscadc.c @@ -57,10 +57,10 @@ EXPORT_SYMBOL_GPL(am335x_tsc_se_update); void am335x_tsc_se_set(struct ti_tscadc_dev *tsadc, u32 val) { spin_lock(&tsadc->reg_lock); + tsadc->reg_se_cache = tscadc_readl(tsadc, REG_SE); tsadc->reg_se_cache |= val; - spin_unlock(&tsadc->reg_lock); - am335x_tsc_se_update(tsadc); + spin_unlock(&tsadc->reg_lock); } EXPORT_SYMBOL_GPL(am335x_tsc_se_set); |