From: Jerry Ray <jerry.ray@microchip.com>
To: Andrew Lunn <andrew@lunn.ch>,
Florian Fainelli <f.fainelli@gmail.com>,
Vladimir Oltean <olteanv@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>,
"Paolo Abeni" <pabeni@redhat.com>, <jbe@pengutronix.de>,
<netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<linux@armlinux.org.uk>, Jerry Ray <jerry.ray@microchip.com>
Subject: [PATCH net-next v5 4/6] dsa: lan9303: Performance Optimization
Date: Fri, 9 Dec 2022 16:47:11 -0600 [thread overview]
Message-ID: <20221209224713.19980-5-jerry.ray@microchip.com> (raw)
In-Reply-To: <20221209224713.19980-1-jerry.ray@microchip.com>
As the regmap_write() is over a slow bus that will sleep, we can speed up
the boot-up time a bit my not bothering to clear a bit that is already
clear.
Signed-off-by: Jerry Ray <jerry.ray@microchip.com>
---
drivers/net/dsa/lan9303-core.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/net/dsa/lan9303-core.c b/drivers/net/dsa/lan9303-core.c
index b0f49d9c3d0c..694249aa1f19 100644
--- a/drivers/net/dsa/lan9303-core.c
+++ b/drivers/net/dsa/lan9303-core.c
@@ -891,8 +891,11 @@ static int lan9303_check_device(struct lan9303 *chip)
if (ret)
return (ret);
- reg &= ~LAN9303_VIRT_SPECIAL_TURBO;
- regmap_write(chip->regmap, LAN9303_VIRT_SPECIAL_CTRL, reg);
+ /* Clear the TURBO Mode bit if it was set. */
+ if (reg & LAN9303_VIRT_SPECIAL_TURBO) {
+ reg &= ~LAN9303_VIRT_SPECIAL_TURBO;
+ regmap_write(chip->regmap, LAN9303_VIRT_SPECIAL_CTRL, reg);
+ }
return 0;
}
--
2.17.1
next prev parent reply other threads:[~2022-12-09 22:47 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-09 22:47 [PATCH net-next v5 0/6] dsa: lan9303: Move to PHYLINK Jerry Ray
2022-12-09 22:47 ` [PATCH net-next v5 1/6] dsa: lan9303: align dsa_switch_ops members Jerry Ray
2022-12-09 22:47 ` [PATCH net-next v5 2/6] dsa: lan9303: move Turbo Mode bit initialization Jerry Ray
2022-12-10 4:13 ` Jakub Kicinski
2022-12-09 22:47 ` [PATCH net-next v5 3/6] dsa: lan9303: Add exception logic for read failure Jerry Ray
2022-12-09 22:47 ` Jerry Ray [this message]
2022-12-12 18:43 ` [PATCH net-next v5 4/6] dsa: lan9303: Performance Optimization Vladimir Oltean
2022-12-09 22:47 ` [PATCH net-next v5 5/6] dsa: lan9303: Determine CPU port based on dsa_switch ptr Jerry Ray
2022-12-11 22:46 ` Vladimir Oltean
2022-12-12 17:42 ` Jerry.Ray
2022-12-12 18:36 ` Vladimir Oltean
2022-12-09 22:47 ` [PATCH net-next v5 6/6] dsa: lan9303: Migrate to PHYLINK Jerry Ray
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