At Fri, 25 Apr 2014 22:45:30 +0900, Takashi Sakamoto wrote:
In post commit, a quirk of this firmware about transactions is reported. This commit apply a workaround for this quirk.
They often fail transactions due to gap_count mismatch. This state is changed by generating bus reset.
The fw_schedule_bus_reset() is an exported symbol in firewire-core. But there are no header for public. This commit moves its prototype from drivers/firewire/core.h to include/linux/firewire.h.
This mismatch still affects bus management before generating this bus reset. It still takes a time to call driver's probe() because transactions are still often failed.
Signed-off-by: Takashi Sakamoto o-takashi@sakamocchi.jp
Hrm, I should have taken a deeper review. This change was slipped to my tree without Stefan's ack. Stefan, is it OK to keep this change as is?
thanks,
Takashi
drivers/firewire/core.h | 1 - include/linux/firewire.h | 3 +++ sound/firewire/bebob/bebob.c | 32 ++++++++++++++++++++++++++++---- sound/firewire/bebob/bebob.h | 1 + 4 files changed, 32 insertions(+), 5 deletions(-)
diff --git a/drivers/firewire/core.h b/drivers/firewire/core.h index c98764a..870044e 100644 --- a/drivers/firewire/core.h +++ b/drivers/firewire/core.h @@ -118,7 +118,6 @@ int fw_card_add(struct fw_card *card, u32 max_receive, u32 link_speed, u64 guid); void fw_core_remove_card(struct fw_card *card); int fw_compute_block_crc(__be32 *block); -void fw_schedule_bus_reset(struct fw_card *card, bool delayed, bool short_reset); void fw_schedule_bm_work(struct fw_card *card, unsigned long delay);
/* -cdev */ diff --git a/include/linux/firewire.h b/include/linux/firewire.h index c3683bd..d4b7683 100644 --- a/include/linux/firewire.h +++ b/include/linux/firewire.h @@ -367,6 +367,9 @@ static inline int fw_stream_packet_destination_id(int tag, int channel, int sy) return tag << 14 | channel << 8 | sy; }
+void fw_schedule_bus_reset(struct fw_card *card, bool delayed,
bool short_reset);
struct fw_descriptor { struct list_head link; size_t length; diff --git a/sound/firewire/bebob/bebob.c b/sound/firewire/bebob/bebob.c index e1dd421..31b96b7 100644 --- a/sound/firewire/bebob/bebob.c +++ b/sound/firewire/bebob/bebob.c @@ -247,10 +247,26 @@ bebob_probe(struct fw_unit *unit, if (err < 0) goto error;
- err = snd_card_register(card);
- if (err < 0) {
snd_bebob_stream_destroy_duplex(bebob);
goto error;
if (!bebob->maudio_special_quirk) {
err = snd_card_register(card);
if (err < 0) {
snd_bebob_stream_destroy_duplex(bebob);
goto error;
}
} else {
/*
* This is a workaround. This bus reset seems to have an effect
* to make devices correctly handling transactions. Without
* this, the devices have gap_count mismatch. This causes much
* failure of transaction.
*
* Just after registration, user-land application receive
* signals from dbus and starts I/Os. To avoid I/Os till the
* future bus reset, registration is done in next update().
*/
bebob->deferred_registration = true;
fw_schedule_bus_reset(fw_parent_device(bebob->unit)->card,
false, true);
}
dev_set_drvdata(&unit->device, bebob);
@@ -273,6 +289,14 @@ bebob_update(struct fw_unit *unit)
fcp_bus_reset(bebob->unit); snd_bebob_stream_update_duplex(bebob);
- if (bebob->deferred_registration) {
if (snd_card_register(bebob->card) < 0) {
snd_bebob_stream_destroy_duplex(bebob);
snd_card_free(bebob->card);
}
bebob->deferred_registration = false;
- }
}
static void bebob_remove(struct fw_unit *unit) diff --git a/sound/firewire/bebob/bebob.h b/sound/firewire/bebob/bebob.h index 4a54e74..91b26b0 100644 --- a/sound/firewire/bebob/bebob.h +++ b/sound/firewire/bebob/bebob.h @@ -109,6 +109,7 @@ struct snd_bebob {
/* for M-Audio special devices */ void *maudio_special_quirk;
- bool deferred_registration;
};
static inline int
1.8.3.2