diff options
Diffstat (limited to 'drivers/dpll/dpll_core.c')
| -rw-r--r-- | drivers/dpll/dpll_core.c | 52 |
1 files changed, 50 insertions, 2 deletions
diff --git a/drivers/dpll/dpll_core.c b/drivers/dpll/dpll_core.c index 32019dc33cca..a461095efd8a 100644 --- a/drivers/dpll/dpll_core.c +++ b/drivers/dpll/dpll_core.c @@ -443,8 +443,11 @@ static void dpll_pin_prop_free(struct dpll_pin_properties *prop) static int dpll_pin_prop_dup(const struct dpll_pin_properties *src, struct dpll_pin_properties *dst) { + if (WARN_ON(src->freq_supported && !src->freq_supported_num)) + return -EINVAL; + memcpy(dst, src, sizeof(*dst)); - if (src->freq_supported && src->freq_supported_num) { + if (src->freq_supported) { size_t freq_size = src->freq_supported_num * sizeof(*src->freq_supported); dst->freq_supported = kmemdup(src->freq_supported, @@ -503,14 +506,16 @@ dpll_pin_alloc(u64 clock_id, u32 pin_idx, struct module *module, refcount_set(&pin->refcount, 1); xa_init_flags(&pin->dpll_refs, XA_FLAGS_ALLOC); xa_init_flags(&pin->parent_refs, XA_FLAGS_ALLOC); + xa_init_flags(&pin->ref_sync_pins, XA_FLAGS_ALLOC); ret = xa_alloc_cyclic(&dpll_pin_xa, &pin->id, pin, xa_limit_32b, &dpll_pin_xa_id, GFP_KERNEL); - if (ret) + if (ret < 0) goto err_xa_alloc; return pin; err_xa_alloc: xa_destroy(&pin->dpll_refs); xa_destroy(&pin->parent_refs); + xa_destroy(&pin->ref_sync_pins); dpll_pin_prop_free(&pin->prop); err_pin_prop: kfree(pin); @@ -592,6 +597,7 @@ void dpll_pin_put(struct dpll_pin *pin) xa_erase(&dpll_pin_xa, pin->id); xa_destroy(&pin->dpll_refs); xa_destroy(&pin->parent_refs); + xa_destroy(&pin->ref_sync_pins); dpll_pin_prop_free(&pin->prop); kfree_rcu(pin, rcu); } @@ -656,11 +662,26 @@ dpll_pin_register(struct dpll_device *dpll, struct dpll_pin *pin, } EXPORT_SYMBOL_GPL(dpll_pin_register); +static void dpll_pin_ref_sync_pair_del(u32 ref_sync_pin_id) +{ + struct dpll_pin *pin, *ref_sync_pin; + unsigned long i; + + xa_for_each(&dpll_pin_xa, i, pin) { + ref_sync_pin = xa_load(&pin->ref_sync_pins, ref_sync_pin_id); + if (ref_sync_pin) { + xa_erase(&pin->ref_sync_pins, ref_sync_pin_id); + __dpll_pin_change_ntf(pin); + } + } +} + static void __dpll_pin_unregister(struct dpll_device *dpll, struct dpll_pin *pin, const struct dpll_pin_ops *ops, void *priv, void *cookie) { ASSERT_DPLL_PIN_REGISTERED(pin); + dpll_pin_ref_sync_pair_del(pin->id); dpll_xa_ref_pin_del(&dpll->pin_refs, pin, ops, priv, cookie); dpll_xa_ref_dpll_del(&pin->dpll_refs, dpll, ops, priv, cookie); if (xa_empty(&pin->dpll_refs)) @@ -780,6 +801,33 @@ void dpll_pin_on_pin_unregister(struct dpll_pin *parent, struct dpll_pin *pin, } EXPORT_SYMBOL_GPL(dpll_pin_on_pin_unregister); +/** + * dpll_pin_ref_sync_pair_add - create a reference sync signal pin pair + * @pin: pin which produces the base frequency + * @ref_sync_pin: pin which produces the sync signal + * + * Once pins are paired, the user-space configuration of reference sync pair + * is possible. + * Context: Acquires a lock (dpll_lock) + * Return: + * * 0 on success + * * negative - error value + */ +int dpll_pin_ref_sync_pair_add(struct dpll_pin *pin, + struct dpll_pin *ref_sync_pin) +{ + int ret; + + mutex_lock(&dpll_lock); + ret = xa_insert(&pin->ref_sync_pins, ref_sync_pin->id, + ref_sync_pin, GFP_KERNEL); + __dpll_pin_change_ntf(pin); + mutex_unlock(&dpll_lock); + + return ret; +} +EXPORT_SYMBOL_GPL(dpll_pin_ref_sync_pair_add); + static struct dpll_device_registration * dpll_device_registration_first(struct dpll_device *dpll) { |