hwspinlock: qcom: implement bust operation
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@quicinc.com> Reviewed-by: Bjorn Andersson <andersson@kernel.org> Signed-off-by: Chris Lew <quic_clew@quicinc.com> Link: https://lore.kernel.org/r/20240529-hwspinlock-bust-v3-2-c8b924ffa5a2@quicinc.com Signed-off-by: Bjorn Andersson <andersson@kernel.org>
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@ -64,9 +64,34 @@ static void qcom_hwspinlock_unlock(struct hwspinlock *lock)
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pr_err("%s: failed to unlock spinlock\n", __func__);
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}
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static int qcom_hwspinlock_bust(struct hwspinlock *lock, unsigned int id)
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{
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struct regmap_field *field = lock->priv;
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u32 owner;
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int ret;
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ret = regmap_field_read(field, &owner);
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if (ret) {
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dev_err(lock->bank->dev, "unable to query spinlock owner\n");
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return ret;
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}
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if (owner != id)
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return 0;
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ret = regmap_field_write(field, 0);
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if (ret) {
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dev_err(lock->bank->dev, "failed to bust spinlock\n");
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return ret;
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}
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return 0;
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}
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static const struct hwspinlock_ops qcom_hwspinlock_ops = {
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.trylock = qcom_hwspinlock_trylock,
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.unlock = qcom_hwspinlock_unlock,
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.bust = qcom_hwspinlock_bust,
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};
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static const struct regmap_config sfpb_mutex_config = {
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