On Fri, May 24, 2024 at 06:26:41PM -0700, Chris Lew wrote: > From: Richard Maina <quic_rmaina@xxxxxxxxxxx> > > Implement a new operation qcom_hwspinlock_bust() which can be invoked > to bust any locks that are in use when a remoteproc is stopped or > crashed. > > Signed-off-by: Richard Maina <quic_rmaina@xxxxxxxxxxx> > Signed-off-by: Chris Lew <quic_clew@xxxxxxxxxxx> Reviewed-by: Bjorn Andersson <andersson@xxxxxxxxxx> Regards, Bjorn > --- > drivers/hwspinlock/qcom_hwspinlock.c | 25 +++++++++++++++++++++++++ > 1 file changed, 25 insertions(+) > > diff --git a/drivers/hwspinlock/qcom_hwspinlock.c b/drivers/hwspinlock/qcom_hwspinlock.c > index 814dfe8697bf..0390979fd765 100644 > --- a/drivers/hwspinlock/qcom_hwspinlock.c > +++ b/drivers/hwspinlock/qcom_hwspinlock.c > @@ -64,9 +64,34 @@ static void qcom_hwspinlock_unlock(struct hwspinlock *lock) > pr_err("%s: failed to unlock spinlock\n", __func__); > } > > +static int qcom_hwspinlock_bust(struct hwspinlock *lock, unsigned int id) > +{ > + struct regmap_field *field = lock->priv; > + u32 owner; > + int ret; > + > + ret = regmap_field_read(field, &owner); > + if (ret) { > + dev_err(lock->bank->dev, "unable to query spinlock owner\n"); > + return ret; > + } > + > + if (owner != id) > + return 0; > + > + ret = regmap_field_write(field, 0); > + if (ret) { > + dev_err(lock->bank->dev, "failed to bust spinlock\n"); > + return ret; > + } > + > + return 0; > +} > + > static const struct hwspinlock_ops qcom_hwspinlock_ops = { > .trylock = qcom_hwspinlock_trylock, > .unlock = qcom_hwspinlock_unlock, > + .bust = qcom_hwspinlock_bust, > }; > > static const struct regmap_config sfpb_mutex_config = { > > -- > 2.25.1 >