netdev - [PATCH V4 09/19] net: ks8851: Use 16-bit read of RXFC register

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Message-Id: <20200414182029.183594-10-marex@denx.de>
Date:   Tue, 14 Apr 2020 20:20:19 +0200
From:   Marek Vasut <marex@...x.de>
To:     netdev@...r.kernel.org
Cc:     Marek Vasut <marex@...x.de>,
        "David S . Miller" <davem@...emloft.net>,
        Lukas Wunner <lukas@...ner.de>, Petr Stetiar <ynezz@...e.cz>,
        YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH V4 09/19] net: ks8851: Use 16-bit read of RXFC register

The RXFC register is the only one being read using 8-bit accessors.
To make it easier to support the 16-bit accesses used by the parallel
bus variant of KS8851, use 16-bit accessor to read RXFC register as
well as neighboring RXFCTR register.

Remove ks8851_rdreg8() as it is not used anywhere anymore.

There should be no functional change.

Signed-off-by: Marek Vasut <marex@...x.de>
Cc: David S. Miller <davem@...emloft.net>
Cc: Lukas Wunner <lukas@...ner.de>
Cc: Petr Stetiar <ynezz@...e.cz>
Cc: YueHaibing <yuehaibing@...wei.com>
---
V2: No change
V3: No change
V4: Drop the NOTE from the comment, the performance is OK
---
 drivers/net/ethernet/micrel/ks8851.c | 17 +----------------
 1 file changed, 1 insertion(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/micrel/ks8851.c b/drivers/net/ethernet/micrel/ks8851.c
index bb2f0dc8214d..b9820068c839 100644
--- a/drivers/net/ethernet/micrel/ks8851.c
+++ b/drivers/net/ethernet/micrel/ks8851.c
@@ -236,21 +236,6 @@ static void ks8851_rdreg(struct ks8851_net *ks, unsigned op,
 		memcpy(rxb, trx + 2, rxl);
 }
 
-/**
- * ks8851_rdreg8 - read 8 bit register from device
- * @ks: The chip information
- * @reg: The register address
- *
- * Read a 8bit register from the chip, returning the result
-*/
-static unsigned ks8851_rdreg8(struct ks8851_net *ks, unsigned reg)
-{
-	u8 rxb[1];
-
-	ks8851_rdreg(ks, MK_OP(1 << (reg & 3), reg), rxb, 1);
-	return rxb[0];
-}
-
 /**
  * ks8851_rdreg16 - read 16 bit register from device
  * @ks: The chip information
@@ -470,7 +455,7 @@ static void ks8851_rx_pkts(struct ks8851_net *ks)
 	unsigned rxstat;
 	u8 *rxpkt;
 
-	rxfc = ks8851_rdreg8(ks, KS_RXFC);
+	rxfc = (ks8851_rdreg16(ks, KS_RXFCTR) >> 8) & 0xff;
 
 	netif_dbg(ks, rx_status, ks->netdev,
 		  "%s: %d packets\n", __func__, rxfc);
-- 
2.25.1