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net: dsa: qca8k: improve internal mdio read/write bus access 

Improve the internal mdio read/write bus access by caching the value
without accessing it for every read/write.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ansuel Smith 2021-05-14 23:00:12 +02:00 committed by David S. Miller
parent 0c994a28e7
commit b7ebac354d
1 changed files with 15 additions and 13 deletions
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28
drivers/net/dsa/qca8k.c
View File

@ -655,6 +655,7 @@ static int
qca8k_mdio_write(struct mii_bus *salve_bus, int phy, int regnum, u16 data)
{
struct qca8k_priv *priv = salve_bus->priv;
struct mii_bus *bus = priv->bus;
u16 r1, r2, page;
u32 val;
int ret;
@ -669,22 +670,22 @@ qca8k_mdio_write(struct mii_bus *salve_bus, int phy, int regnum, u16 data)
qca8k_split_addr(QCA8K_MDIO_MASTER_CTRL, &r1, &r2, &page);
mutex_lock_nested(&priv->bus->mdio_lock, MDIO_MUTEX_NESTED);
mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
ret = qca8k_set_page(priv->bus, page);
ret = qca8k_set_page(bus, page);
if (ret)
goto exit;
qca8k_mii_write32(priv->bus, 0x10 | r2, r1, val);
qca8k_mii_write32(bus, 0x10 | r2, r1, val);
ret = qca8k_mdio_busy_wait(priv->bus, QCA8K_MDIO_MASTER_CTRL,
ret = qca8k_mdio_busy_wait(bus, QCA8K_MDIO_MASTER_CTRL,
QCA8K_MDIO_MASTER_BUSY);
exit:
/* even if the busy_wait timeouts try to clear the MASTER_EN */
qca8k_mii_write32(priv->bus, 0x10 | r2, r1, 0);
qca8k_mii_write32(bus, 0x10 | r2, r1, 0);
mutex_unlock(&priv->bus->mdio_lock);
mutex_unlock(&bus->mdio_lock);
return ret;
}
@ -693,6 +694,7 @@ static int
qca8k_mdio_read(struct mii_bus *salve_bus, int phy, int regnum)
{
struct qca8k_priv *priv = salve_bus->priv;
struct mii_bus *bus = priv->bus;
u16 r1, r2, page;
u32 val;
int ret;
@ -706,26 +708,26 @@ qca8k_mdio_read(struct mii_bus *salve_bus, int phy, int regnum)
qca8k_split_addr(QCA8K_MDIO_MASTER_CTRL, &r1, &r2, &page);
mutex_lock_nested(&priv->bus->mdio_lock, MDIO_MUTEX_NESTED);
mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
ret = qca8k_set_page(priv->bus, page);
ret = qca8k_set_page(bus, page);
if (ret)
goto exit;
qca8k_mii_write32(priv->bus, 0x10 | r2, r1, val);
qca8k_mii_write32(bus, 0x10 | r2, r1, val);
ret = qca8k_mdio_busy_wait(priv->bus, QCA8K_MDIO_MASTER_CTRL,
ret = qca8k_mdio_busy_wait(bus, QCA8K_MDIO_MASTER_CTRL,
QCA8K_MDIO_MASTER_BUSY);
if (ret)
goto exit;
val = qca8k_mii_read32(priv->bus, 0x10 | r2, r1);
val = qca8k_mii_read32(bus, 0x10 | r2, r1);
exit:
/* even if the busy_wait timeouts try to clear the MASTER_EN */
qca8k_mii_write32(priv->bus, 0x10 | r2, r1, 0);
qca8k_mii_write32(bus, 0x10 | r2, r1, 0);
mutex_unlock(&priv->bus->mdio_lock);
mutex_unlock(&bus->mdio_lock);
if (val >= 0)
val &= QCA8K_MDIO_MASTER_DATA_MASK;