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media: pulse8-cec: move the transmit to a workqueue

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Instead of adap_transmit waiting until the full message
is transmitted (and thus hoarding the adap->lock mutex), have it
kick off a transmit workqueue. This prevents adap->lock from
being locked for a very long time.

Also skip FAILED_ACK reports for broadcast messages: this makes
no sense, and it seems a spurious message coming from the
Pulse-Eight, since some time later I see the SUCCEEDED message.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Hans Verkuil 2019-12-11 17:22:27 +01:00 committed by Mauro Carvalho Chehab
parent b7d0567f55
commit b36910e078
1 changed files with 81 additions and 51 deletions
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132
drivers/media/usb/pulse8-cec/pulse8-cec.c
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@ -169,18 +169,27 @@ struct pulse8 {
struct serio *serio;
struct cec_adapter *adap;
unsigned int vers;
struct completion cmd_done;
struct work_struct work;
u8 work_result;
struct delayed_work ping_eeprom_work;
struct work_struct irq_work;
u8 irq_work_result;
struct cec_msg rx_msg;
struct work_struct tx_work;
u32 tx_done_status;
u32 tx_signal_free_time;
struct cec_msg tx_msg;
bool tx_msg_is_bcast;
struct completion cmd_done;
u8 data[DATA_SIZE];
unsigned int len;
u8 buf[DATA_SIZE];
unsigned int idx;
bool escape;
bool started;
/* locks access to the adapter */
struct mutex lock;
bool config_pending;
@ -262,14 +271,60 @@ static int pulse8_send_and_wait(struct pulse8 *pulse8,
return err == -ENOTTY ? -EIO : err;
}
static void pulse8_tx_work_handler(struct work_struct *work)
{
struct pulse8 *pulse8 = container_of(work, struct pulse8, tx_work);
struct cec_msg *msg = &pulse8->tx_msg;
unsigned int i;
u8 cmd[2];
int err;
if (msg->len == 0)
return;
mutex_lock(&pulse8->lock);
cmd[0] = MSGCODE_TRANSMIT_IDLETIME;
cmd[1] = pulse8->tx_signal_free_time;
err = pulse8_send_and_wait(pulse8, cmd, 2,
MSGCODE_COMMAND_ACCEPTED, 1);
cmd[0] = MSGCODE_TRANSMIT_ACK_POLARITY;
cmd[1] = cec_msg_is_broadcast(msg);
pulse8->tx_msg_is_bcast = cec_msg_is_broadcast(msg);
if (!err)
err = pulse8_send_and_wait(pulse8, cmd, 2,
MSGCODE_COMMAND_ACCEPTED, 1);
cmd[0] = msg->len == 1 ? MSGCODE_TRANSMIT_EOM : MSGCODE_TRANSMIT;
cmd[1] = msg->msg[0];
if (!err)
err = pulse8_send_and_wait(pulse8, cmd, 2,
MSGCODE_COMMAND_ACCEPTED, 1);
if (!err && msg->len > 1) {
for (i = 1; !err && i < msg->len; i++) {
cmd[0] = ((i == msg->len - 1)) ?
MSGCODE_TRANSMIT_EOM : MSGCODE_TRANSMIT;
cmd[1] = msg->msg[i];
err = pulse8_send_and_wait(pulse8, cmd, 2,
MSGCODE_COMMAND_ACCEPTED, 1);
}
}
if (err && debug)
dev_info(pulse8->dev, "%s(0x%02x) failed with error %d for msg %*ph\n",
pulse8_msgname(cmd[0]), cmd[1],
err, msg->len, msg->msg);
msg->len = 0;
mutex_unlock(&pulse8->lock);
if (err)
cec_transmit_attempt_done(pulse8->adap, CEC_TX_STATUS_ERROR);
}
static void pulse8_irq_work_handler(struct work_struct *work)
{
struct pulse8 *pulse8 =
container_of(work, struct pulse8, work);
u8 result = pulse8->work_result;
container_of(work, struct pulse8, irq_work);
u8 result = pulse8->irq_work_result;
u32 status;
pulse8->work_result = 0;
pulse8->irq_work_result = 0;
switch (result & 0x3f) {
case MSGCODE_FRAME_DATA:
cec_received_msg(pulse8->adap, &pulse8->rx_msg);
@ -315,28 +370,34 @@ static irqreturn_t pulse8_interrupt(struct serio *serio, unsigned char data,
break;
msg->msg[msg->len++] = pulse8->buf[1];
if (msgcode & MSGCODE_FRAME_EOM) {
WARN_ON(pulse8->work_result);
pulse8->work_result = msgcode;
schedule_work(&pulse8->work);
WARN_ON(pulse8->irq_work_result);
pulse8->irq_work_result = msgcode;
schedule_work(&pulse8->irq_work);
break;
}
break;
case MSGCODE_TRANSMIT_SUCCEEDED:
WARN_ON(pulse8->tx_done_status);
pulse8->tx_done_status = CEC_TX_STATUS_OK;
schedule_work(&pulse8->work);
schedule_work(&pulse8->irq_work);
break;
case MSGCODE_TRANSMIT_FAILED_ACK:
/*
* A NACK for a broadcast message makes no sense, these
* seem to be spurious messages and are skipped.
*/
if (pulse8->tx_msg_is_bcast)
break;
WARN_ON(pulse8->tx_done_status);
pulse8->tx_done_status = CEC_TX_STATUS_NACK;
schedule_work(&pulse8->work);
schedule_work(&pulse8->irq_work);
break;
case MSGCODE_TRANSMIT_FAILED_LINE:
case MSGCODE_TRANSMIT_FAILED_TIMEOUT_DATA:
case MSGCODE_TRANSMIT_FAILED_TIMEOUT_LINE:
WARN_ON(pulse8->tx_done_status);
pulse8->tx_done_status = CEC_TX_STATUS_ERROR;
schedule_work(&pulse8->work);
schedule_work(&pulse8->irq_work);
break;
case MSGCODE_HIGH_ERROR:
case MSGCODE_LOW_ERROR:
@ -512,48 +573,14 @@ static int pulse8_cec_adap_transmit(struct cec_adapter *adap, u8 attempts,
u32 signal_free_time, struct cec_msg *msg)
{
struct pulse8 *pulse8 = cec_get_drvdata(adap);
u8 cmd[2];
unsigned int i;
int err;
pulse8->tx_msg = *msg;
if (debug)
dev_info(pulse8->dev, "adap transmit %*ph\n",
msg->len, msg->msg);
mutex_lock(&pulse8->lock);
cmd[0] = MSGCODE_TRANSMIT_IDLETIME;
cmd[1] = signal_free_time;
err = pulse8_send_and_wait(pulse8, cmd, 2,
MSGCODE_COMMAND_ACCEPTED, 1);
cmd[0] = MSGCODE_TRANSMIT_ACK_POLARITY;
cmd[1] = cec_msg_is_broadcast(msg);
if (!err)
err = pulse8_send_and_wait(pulse8, cmd, 2,
MSGCODE_COMMAND_ACCEPTED, 1);
cmd[0] = msg->len == 1 ? MSGCODE_TRANSMIT_EOM : MSGCODE_TRANSMIT;
cmd[1] = msg->msg[0];
if (!err)
err = pulse8_send_and_wait(pulse8, cmd, 2,
MSGCODE_COMMAND_ACCEPTED, 1);
if (!err && msg->len > 1) {
cmd[0] = msg->len == 2 ? MSGCODE_TRANSMIT_EOM :
MSGCODE_TRANSMIT;
cmd[1] = msg->msg[1];
err = pulse8_send_and_wait(pulse8, cmd, 2,
MSGCODE_COMMAND_ACCEPTED, 1);
for (i = 0; !err && i + 2 < msg->len; i++) {
cmd[0] = (i + 2 == msg->len - 1) ?
MSGCODE_TRANSMIT_EOM : MSGCODE_TRANSMIT;
cmd[1] = msg->msg[i + 2];
err = pulse8_send_and_wait(pulse8, cmd, 2,
MSGCODE_COMMAND_ACCEPTED, 1);
}
}
if (err && debug)
dev_info(pulse8->dev, "%s(0x%02x) failed with error %d for msg %*ph\n",
pulse8_msgname(cmd[0]), cmd[1],
err, msg->len, msg->msg);
mutex_unlock(&pulse8->lock);
return err;
pulse8->tx_signal_free_time = signal_free_time;
schedule_work(&pulse8->tx_work);
return 0;
}
static const struct cec_adap_ops pulse8_cec_adap_ops = {
@ -568,6 +595,8 @@ static void pulse8_disconnect(struct serio *serio)
cec_unregister_adapter(pulse8->adap);
cancel_delayed_work_sync(&pulse8->ping_eeprom_work);
cancel_work_sync(&pulse8->irq_work);
cancel_work_sync(&pulse8->tx_work);
dev_info(&serio->dev, "disconnected\n");
serio_close(serio);
serio_set_drvdata(serio, NULL);
@ -758,7 +787,8 @@ static int pulse8_connect(struct serio *serio, struct serio_driver *drv)
pulse8->dev = &serio->dev;
serio_set_drvdata(serio, pulse8);
INIT_WORK(&pulse8->work, pulse8_irq_work_handler);
INIT_WORK(&pulse8->irq_work, pulse8_irq_work_handler);
INIT_WORK(&pulse8->tx_work, pulse8_tx_work_handler);
mutex_init(&pulse8->lock);
pulse8->config_pending = false;