linux-kernel - [PATCH V2 net 1/2] qca_spi: Fix clock speed for multiple QCA7000

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Message-Id: <20241206184643.123399-2-wahrenst@gmx.net>
Date: Fri,  6 Dec 2024 19:46:42 +0100
From: Stefan Wahren <wahrenst@....net>
To: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>
Cc: chf.fritz@...glemail.com,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Stefan Wahren <wahrenst@....net>
Subject: [PATCH V2 net 1/2] qca_spi: Fix clock speed for multiple QCA7000

Storing the maximum clock speed in module parameter qcaspi_clkspeed
has the unintended side effect that the first probed instance
defines the value for all other instances. Fix this issue by storing
it in max_speed_hz of the relevant SPI device.

This fix keeps the priority of the speed parameter (module parameter,
device tree property, driver default). Btw this uses the opportunity
to get the rid of the unused member clkspeed.

Fixes: 291ab06ecf67 ("net: qualcomm: new Ethernet over SPI driver for QCA7000")
Signed-off-by: Stefan Wahren <wahrenst@....net>
---
 drivers/net/ethernet/qualcomm/qca_spi.c | 24 ++++++++++--------------
 drivers/net/ethernet/qualcomm/qca_spi.h |  1 -
 2 files changed, 10 insertions(+), 15 deletions(-)

diff --git a/drivers/net/ethernet/qualcomm/qca_spi.c b/drivers/net/ethernet/qualcomm/qca_spi.c
index ef9c02b000e4..d328e770bcbe 100644
--- a/drivers/net/ethernet/qualcomm/qca_spi.c
+++ b/drivers/net/ethernet/qualcomm/qca_spi.c
@@ -818,7 +818,6 @@ qcaspi_netdev_init(struct net_device *dev)

 	dev->mtu = QCAFRM_MAX_MTU;
 	dev->type = ARPHRD_ETHER;
-	qca->clkspeed = qcaspi_clkspeed;
 	qca->burst_len = qcaspi_burst_len;
 	qca->spi_thread = NULL;
 	qca->buffer_size = (QCAFRM_MAX_MTU + VLAN_ETH_HLEN + QCAFRM_HEADER_LEN +
@@ -909,17 +908,15 @@ qca_spi_probe(struct spi_device *spi)
 	legacy_mode = of_property_read_bool(spi->dev.of_node,
 					    "qca,legacy-mode");

-	if (qcaspi_clkspeed == 0) {
-		if (spi->max_speed_hz)
-			qcaspi_clkspeed = spi->max_speed_hz;
-		else
-			qcaspi_clkspeed = QCASPI_CLK_SPEED;
-	}
+	if (qcaspi_clkspeed)
+		spi->max_speed_hz = qcaspi_clkspeed;
+	else if (!spi->max_speed_hz)
+		spi->max_speed_hz = QCASPI_CLK_SPEED;

-	if ((qcaspi_clkspeed < QCASPI_CLK_SPEED_MIN) ||
-	    (qcaspi_clkspeed > QCASPI_CLK_SPEED_MAX)) {
-		dev_err(&spi->dev, "Invalid clkspeed: %d\n",
-			qcaspi_clkspeed);
+	if (spi->max_speed_hz < QCASPI_CLK_SPEED_MIN ||
+	    spi->max_speed_hz > QCASPI_CLK_SPEED_MAX) {
+		dev_err(&spi->dev, "Invalid clkspeed: %u\n",
+			spi->max_speed_hz);
 		return -EINVAL;
 	}

@@ -944,14 +941,13 @@ qca_spi_probe(struct spi_device *spi)
 		return -EINVAL;
 	}

-	dev_info(&spi->dev, "ver=%s, clkspeed=%d, burst_len=%d, pluggable=%d\n",
+	dev_info(&spi->dev, "ver=%s, clkspeed=%u, burst_len=%d, pluggable=%d\n",
 		 QCASPI_DRV_VERSION,
-		 qcaspi_clkspeed,
+		 spi->max_speed_hz,
 		 qcaspi_burst_len,
 		 qcaspi_pluggable);

 	spi->mode = SPI_MODE_3;
-	spi->max_speed_hz = qcaspi_clkspeed;
 	if (spi_setup(spi) < 0) {
 		dev_err(&spi->dev, "Unable to setup SPI device\n");
 		return -EFAULT;
diff --git a/drivers/net/ethernet/qualcomm/qca_spi.h b/drivers/net/ethernet/qualcomm/qca_spi.h
index 7ba5c9e2f61c..90b290f94c27 100644
--- a/drivers/net/ethernet/qualcomm/qca_spi.h
+++ b/drivers/net/ethernet/qualcomm/qca_spi.h
@@ -89,7 +89,6 @@ struct qcaspi {
 #endif

 	/* user configurable options */
-	u32 clkspeed;
 	u8 legacy_mode;
 	u16 burst_len;
 };
--
2.34.1