3.16.74-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Christoph Vogtländer c.vogtlaender@sigma-surface-science.com
commit b00ef53053191d3025c15e8041699f8c9d132daf upstream.
It must be made sure that immediate mode is not already set, when modifying shadow register value in ehrpwm_pwm_disable(). Otherwise modifications to the action-qualifier continuous S/W force register(AQSFRC) will be done in the active register. This may happen when both channels are being disabled. In this case, only the first channel state will be recorded as disabled in the shadow register. Later, when enabling the first channel again, the second channel would be enabled as well. Setting RLDCSF to zero, first, ensures that the shadow register is updated as desired.
Fixes: 38dabd91ff0b ("pwm: tiehrpwm: Fix disabling of output of PWMs") Signed-off-by: Christoph Vogtländer c.vogtlaender@sigma-surface-science.com [vigneshr@ti.com: Improve commit message] Signed-off-by: Vignesh Raghavendra vigneshr@ti.com Signed-off-by: Thierry Reding thierry.reding@gmail.com Signed-off-by: Ben Hutchings ben@decadent.org.uk --- drivers/pwm/pwm-tiehrpwm.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/pwm/pwm-tiehrpwm.c +++ b/drivers/pwm/pwm-tiehrpwm.c @@ -379,6 +379,8 @@ static void ehrpwm_pwm_disable(struct pw }
/* Update shadow register first before modifying active register */ + ehrpwm_modify(pc->mmio_base, AQSFRC, AQSFRC_RLDCSF_MASK, + AQSFRC_RLDCSF_ZRO); ehrpwm_modify(pc->mmio_base, AQCSFRC, aqcsfrc_mask, aqcsfrc_val); /* * Changes to immediate action on Action Qualifier. This puts