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74 lines
2.6 KiB
Diff
74 lines
2.6 KiB
Diff
From a4165830ca237f2b3318faf62562bce8ce12a389 Mon Sep 17 00:00:00 2001
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From: Christian Marangi <ansuelsmth@gmail.com>
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Date: Thu, 29 Dec 2022 17:33:36 +0100
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Subject: [PATCH 5/5] net: dsa: qca8k: improve mdio master read/write by using
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single lo/hi
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Improve mdio master read/write by using singe mii read/write lo/hi.
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In a read and write we need to poll the mdio master regs in a busy loop
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to check for a specific bit present in the upper half of the reg. We can
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ignore the other half since it won't contain useful data. This will save
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an additional useless read for each read and write operation.
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In a read operation the returned data is present in the mdio master reg
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lower half. We can ignore the other half since it won't contain useful
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data. This will save an additional useless read for each read operation.
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In a read operation it's needed to just set the hi half of the mdio
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master reg as the lo half will be replaced by the result. This will save
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an additional useless write for each read operation.
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Tested-by: Ronald Wahl <ronald.wahl@raritan.com>
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Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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drivers/net/dsa/qca/qca8k-8xxx.c | 12 ++++++------
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1 file changed, 6 insertions(+), 6 deletions(-)
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--- a/drivers/net/dsa/qca/qca8k-8xxx.c
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+++ b/drivers/net/dsa/qca/qca8k-8xxx.c
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@@ -740,9 +740,9 @@ qca8k_mdio_busy_wait(struct mii_bus *bus
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qca8k_split_addr(reg, &r1, &r2, &page);
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- ret = read_poll_timeout(qca8k_mii_read32, ret1, !(val & mask), 0,
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+ ret = read_poll_timeout(qca8k_mii_read_hi, ret1, !(val & mask), 0,
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QCA8K_BUSY_WAIT_TIMEOUT * USEC_PER_MSEC, false,
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- bus, 0x10 | r2, r1, &val);
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+ bus, 0x10 | r2, r1 + 1, &val);
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/* Check if qca8k_read has failed for a different reason
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* before returnting -ETIMEDOUT
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@@ -784,7 +784,7 @@ qca8k_mdio_write(struct qca8k_priv *priv
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exit:
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/* even if the busy_wait timeouts try to clear the MASTER_EN */
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- qca8k_mii_write32(bus, 0x10 | r2, r1, 0);
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+ qca8k_mii_write_hi(bus, 0x10 | r2, r1 + 1, 0);
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mutex_unlock(&bus->mdio_lock);
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@@ -814,18 +814,18 @@ qca8k_mdio_read(struct qca8k_priv *priv,
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if (ret)
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goto exit;
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- qca8k_mii_write32(bus, 0x10 | r2, r1, val);
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+ qca8k_mii_write_hi(bus, 0x10 | r2, r1 + 1, val);
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ret = qca8k_mdio_busy_wait(bus, QCA8K_MDIO_MASTER_CTRL,
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QCA8K_MDIO_MASTER_BUSY);
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if (ret)
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goto exit;
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- ret = qca8k_mii_read32(bus, 0x10 | r2, r1, &val);
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+ ret = qca8k_mii_read_lo(bus, 0x10 | r2, r1, &val);
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exit:
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/* even if the busy_wait timeouts try to clear the MASTER_EN */
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- qca8k_mii_write32(bus, 0x10 | r2, r1, 0);
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+ qca8k_mii_write_hi(bus, 0x10 | r2, r1 + 1, 0);
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mutex_unlock(&bus->mdio_lock);
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