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net: stmmac: reduce unnecessary wakeups from eee sw timer

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Currently, on EEE capable platforms, if EEE SW timer is used, the SW
timer cause 1 wakeup/s even if the TX has successfully entered EEE.
Remove this unnecessary wakeup by only calling mod_timer() if we
haven't successfully entered EEE.

Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jisheng Zhang 2022-01-23 23:54:58 +08:00 committed by David S. Miller
parent e52984be9a
commit c74ead223d
1 changed files with 7 additions and 6 deletions
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13
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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@ -402,7 +402,7 @@ static void stmmac_lpi_entry_timer_config(struct stmmac_priv *priv, bool en)
* Description: this function is to verify and enter in LPI mode in case of
* EEE.
*/
static void stmmac_enable_eee_mode(struct stmmac_priv *priv)
static int stmmac_enable_eee_mode(struct stmmac_priv *priv)
{
u32 tx_cnt = priv->plat->tx_queues_to_use;
u32 queue;
@ -412,13 +412,14 @@ static void stmmac_enable_eee_mode(struct stmmac_priv *priv)
struct stmmac_tx_queue *tx_q = &priv->tx_queue[queue];
if (tx_q->dirty_tx != tx_q->cur_tx)
return; /* still unfinished work */
return -EBUSY; /* still unfinished work */
}
/* Check and enter in LPI mode */
if (!priv->tx_path_in_lpi_mode)
stmmac_set_eee_mode(priv, priv->hw,
priv->plat->en_tx_lpi_clockgating);
return 0;
}
/**
@ -450,8 +451,8 @@ static void stmmac_eee_ctrl_timer(struct timer_list *t)
{
struct stmmac_priv *priv = from_timer(priv, t, eee_ctrl_timer);
stmmac_enable_eee_mode(priv);
mod_timer(&priv->eee_ctrl_timer, STMMAC_LPI_T(priv->tx_lpi_timer));
if (stmmac_enable_eee_mode(priv))
mod_timer(&priv->eee_ctrl_timer, STMMAC_LPI_T(priv->tx_lpi_timer));
}
/**
@ -2647,8 +2648,8 @@ static int stmmac_tx_clean(struct stmmac_priv *priv, int budget, u32 queue)
if (priv->eee_enabled && !priv->tx_path_in_lpi_mode &&
priv->eee_sw_timer_en) {
stmmac_enable_eee_mode(priv);
mod_timer(&priv->eee_ctrl_timer, STMMAC_LPI_T(priv->tx_lpi_timer));
if (stmmac_enable_eee_mode(priv))
mod_timer(&priv->eee_ctrl_timer, STMMAC_LPI_T(priv->tx_lpi_timer));
}
/* We still have pending packets, let's call for a new scheduling */