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caif-hsi: Make inactivity timeout configurable. 

CAIF HSI uses a timer for inactivity. Upon timeout HSI-wake signaling
is initiated to allow power-down of the HSI block.

Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dmitry Tarnyagin 2011-10-13 11:29:27 +00:00 committed by David S. Miller
parent ca63f8c751
commit 28bd204942
2 changed files with 24 additions and 5 deletions
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28
drivers/net/caif/caif_hsi.c
View File

@ -29,6 +29,10 @@ MODULE_DESCRIPTION("CAIF HSI driver");
#define PAD_POW2(x, pow) ((((x)&((pow)-1)) == 0) ? 0 :\
(((pow)-((x)&((pow)-1)))))
static int inactivity_timeout = 1000;
module_param(inactivity_timeout, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(inactivity_timeout, "Inactivity timeout on HSI, ms.");
/*
* HSI padding options.
* Warning: must be a base of 2 (& operation used) and can not be zero !
@ -98,7 +102,8 @@ static void cfhsi_abort_tx(struct cfhsi *cfhsi)
}
cfhsi->tx_state = CFHSI_TX_STATE_IDLE;
if (!test_bit(CFHSI_SHUTDOWN, &cfhsi->bits))
mod_timer(&cfhsi->timer, jiffies + CFHSI_INACTIVITY_TOUT);
mod_timer(&cfhsi->timer,
jiffies + cfhsi->inactivity_timeout);
spin_unlock_bh(&cfhsi->lock);
}
@ -312,7 +317,7 @@ static void cfhsi_tx_done(struct cfhsi *cfhsi)
cfhsi->tx_state = CFHSI_TX_STATE_IDLE;
/* Start inactivity timer. */
mod_timer(&cfhsi->timer,
jiffies + CFHSI_INACTIVITY_TOUT);
jiffies + cfhsi->inactivity_timeout);
spin_unlock_bh(&cfhsi->lock);
goto done;
}
@ -534,7 +539,8 @@ static void cfhsi_rx_done(struct cfhsi *cfhsi)
/* Update inactivity timer if pending. */
spin_lock_bh(&cfhsi->lock);
mod_timer_pending(&cfhsi->timer, jiffies + CFHSI_INACTIVITY_TOUT);
mod_timer_pending(&cfhsi->timer,
jiffies + cfhsi->inactivity_timeout);
spin_unlock_bh(&cfhsi->lock);
if (cfhsi->rx_state.state == CFHSI_RX_STATE_DESC) {
@ -715,7 +721,7 @@ static void cfhsi_wake_up(struct work_struct *work)
__func__);
/* Start inactivity timer. */
mod_timer(&cfhsi->timer,
jiffies + CFHSI_INACTIVITY_TOUT);
jiffies + cfhsi->inactivity_timeout);
spin_unlock_bh(&cfhsi->lock);
return;
}
@ -989,7 +995,19 @@ int cfhsi_probe(struct platform_device *pdev)
goto err_alloc_rx;
}
/* Initialize receive variables. */
/* Pre-calculate inactivity timeout. */
if (inactivity_timeout != -1) {
cfhsi->inactivity_timeout =
inactivity_timeout * HZ / 1000;
if (!cfhsi->inactivity_timeout)
cfhsi->inactivity_timeout = 1;
else if (cfhsi->inactivity_timeout > NEXT_TIMER_MAX_DELTA)
cfhsi->inactivity_timeout = NEXT_TIMER_MAX_DELTA;
} else {
cfhsi->inactivity_timeout = NEXT_TIMER_MAX_DELTA;
}
/* Initialize recieve vaiables. */
cfhsi->rx_ptr = cfhsi->rx_buf;
cfhsi->rx_len = CFHSI_DESC_SZ;

1
include/net/caif/caif_hsi.h
View File

@ -131,6 +131,7 @@ struct cfhsi {
struct cfhsi_dev *dev;
int tx_state;
struct cfhsi_rx_state rx_state;
unsigned long inactivity_timeout;
int rx_len;
u8 *rx_ptr;
u8 *tx_buf;