linux-kernel - [PATCH net-next 1/3] net: pcs: altera-tse: use read_poll

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Date:   Fri, 25 Nov 2022 14:17:59 +0100
From:   Maxime Chevallier <maxime.chevallier@...tlin.com>
To:     davem@...emloft.net, Rob Herring <robh+dt@...nel.org>
Cc:     Maxime Chevallier <maxime.chevallier@...tlin.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        thomas.petazzoni@...tlin.com, Andrew Lunn <andrew@...n.ch>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        devicetree@...r.kernel.org
Subject: [PATCH net-next 1/3] net: pcs: altera-tse: use read_poll_timeout to wait for reset

Software resets on the TSE PCS don't clear registers, but rather reset
all internal state machines regarding AN, comma detection and
encoding/decoding. Use read_poll_timeout to wait for the reset to clear
instead of manually polling the register.

Signed-off-by: Maxime Chevallier <maxime.chevallier@...tlin.com>
---
 drivers/net/pcs/pcs-altera-tse.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/net/pcs/pcs-altera-tse.c b/drivers/net/pcs/pcs-altera-tse.c
index 97a7cabff962..e86cadc391e8 100644
--- a/drivers/net/pcs/pcs-altera-tse.c
+++ b/drivers/net/pcs/pcs-altera-tse.c
@@ -60,7 +60,6 @@ static void tse_pcs_write(struct altera_tse_pcs *tse_pcs, int regnum,
 
 static int tse_pcs_reset(struct altera_tse_pcs *tse_pcs)
 {
-	int i = 0;
 	u16 bmcr;
 
 	/* Reset PCS block */
@@ -68,13 +67,9 @@ static int tse_pcs_reset(struct altera_tse_pcs *tse_pcs)
 	bmcr |= BMCR_RESET;
 	tse_pcs_write(tse_pcs, MII_BMCR, bmcr);
 
-	for (i = 0; i < SGMII_PCS_SW_RESET_TIMEOUT; i++) {
-		if (!(tse_pcs_read(tse_pcs, MII_BMCR) & BMCR_RESET))
-			return 0;
-		udelay(1);
-	}
-
-	return -ETIMEDOUT;
+	return read_poll_timeout(tse_pcs_read, bmcr, (bmcr & BMCR_RESET),
+				 10, SGMII_PCS_SW_RESET_TIMEOUT, 1,
+				 tse_pcs, MII_BMCR);
 }
 
 static int alt_tse_pcs_validate(struct phylink_pcs *pcs,
-- 
2.38.1