[net-next PATCH 1/2] net: ethernet: stmmac: add missing sgmii configure for ipq806x

[net-next PATCH 1/2] net: ethernet: stmmac: add missing sgmii configure for ipq806x

[Christian 'Ansuel' Marangi]

The different gmacid require different configuration based on the soc
and on the gmac id. Add these missing configuration taken from the
original driver.

Signed-off-by: Christian 'Ansuel' Marangi <ansuelsmth@gmail.com>
---
 drivers/net/ethernet/stmicro/stmmac/Kconfig   |  1 +
 .../ethernet/stmicro/stmmac/dwmac-ipq806x.c   | 93 +++++++++++++++----
 2 files changed, 78 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
index 929cfc22cd0c..c4bca16dae57 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -83,6 +83,7 @@ config DWMAC_IPQ806X
 	default ARCH_QCOM
 	depends on OF && (ARCH_QCOM || COMPILE_TEST)
 	select MFD_SYSCON
+	select QCOM_SOCINFO
 	help
 	  Support for QCA IPQ806X DWMAC Ethernet.
 
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
index f7dc8458cde8..832f442254d8 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
@@ -27,6 +27,8 @@
 #include <linux/stmmac.h>
 #include <linux/of_mdio.h>
 #include <linux/module.h>
+#include <linux/sys_soc.h>
+#include <linux/bitfield.h>
 
 #include "stmmac_platform.h"
 
@@ -75,11 +77,20 @@
 #define QSGMII_PHY_RX_SIGNAL_DETECT_EN		BIT(2)
 #define QSGMII_PHY_TX_DRIVER_EN			BIT(3)
 #define QSGMII_PHY_QSGMII_EN			BIT(7)
-#define QSGMII_PHY_PHASE_LOOP_GAIN_OFFSET	12
-#define QSGMII_PHY_RX_DC_BIAS_OFFSET		18
-#define QSGMII_PHY_RX_INPUT_EQU_OFFSET		20
-#define QSGMII_PHY_CDR_PI_SLEW_OFFSET		22
-#define QSGMII_PHY_TX_DRV_AMP_OFFSET		28
+#define QSGMII_PHY_DEEMPHASIS_LVL_MASK		GENMASK(11, 10)
+#define QSGMII_PHY_DEEMPHASIS_LVL(x)		FIELD_PREP(QSGMII_PHY_DEEMPHASIS_LVL_MASK, (x))
+#define QSGMII_PHY_PHASE_LOOP_GAIN_MASK		GENMASK(14, 12)
+#define QSGMII_PHY_PHASE_LOOP_GAIN(x)		FIELD_PREP(QSGMII_PHY_PHASE_LOOP_GAIN_MASK, (x))
+#define QSGMII_PHY_RX_DC_BIAS_MASK		GENMASK(19, 18)
+#define QSGMII_PHY_RX_DC_BIAS(x)		FIELD_PREP(QSGMII_PHY_RX_DC_BIAS_MASK, (x))
+#define QSGMII_PHY_RX_INPUT_EQU_MASK		GENMASK(21, 20)
+#define QSGMII_PHY_RX_INPUT_EQU(x)		FIELD_PREP(QSGMII_PHY_RX_INPUT_EQU_MASK, (x))
+#define QSGMII_PHY_CDR_PI_SLEW_MASK		GENMASK(23, 22)
+#define QSGMII_PHY_CDR_PI_SLEW(x)		FIELD_PREP(QSGMII_PHY_CDR_PI_SLEW_MASK, (x))
+#define QSGMII_PHY_TX_SLEW_MASK			GENMASK(27, 26)
+#define QSGMII_PHY_TX_SLEW(x)			FIELD_PREP(QSGMII_PHY_TX_SLEW_MASK, (x))
+#define QSGMII_PHY_TX_DRV_AMP_MASK		GENMASK(31, 28)
+#define QSGMII_PHY_TX_DRV_AMP(x)		FIELD_PREP(QSGMII_PHY_TX_DRV_AMP_MASK, (x))
 
 struct ipq806x_gmac {
 	struct platform_device *pdev;
@@ -242,6 +253,64 @@ static void ipq806x_gmac_fix_mac_speed(void *priv, unsigned int speed)
 	ipq806x_gmac_set_speed(gmac, speed);
 }
 
+static const struct soc_device_attribute ipq806x_gmac_soc_v1[] = {
+	{
+		.revision = "1.*",
+	},
+	{
+		/* sentinel */
+	}
+};
+
+static int
+ipq806x_gmac_configure_qsgmii_params(struct ipq806x_gmac *gmac)
+{
+	struct platform_device *pdev = gmac->pdev;
+	const struct soc_device_attribute *soc;
+	struct device *dev = &pdev->dev;
+	u32 qsgmii_param;
+
+	switch (gmac->id) {
+	case 1:
+		soc = soc_device_match(ipq806x_gmac_soc_v1);
+
+		if (soc)
+			qsgmii_param = QSGMII_PHY_TX_DRV_AMP(0xc) |
+				       QSGMII_PHY_TX_SLEW(0x2) |
+				       QSGMII_PHY_DEEMPHASIS_LVL(0x2);
+		else
+			qsgmii_param = QSGMII_PHY_TX_DRV_AMP(0xd) |
+				       QSGMII_PHY_TX_SLEW(0x0) |
+				       QSGMII_PHY_DEEMPHASIS_LVL(0x0);
+
+		qsgmii_param |= QSGMII_PHY_RX_DC_BIAS(0x2);
+		break;
+	case 2:
+	case 3:
+		qsgmii_param = QSGMII_PHY_RX_DC_BIAS(0x3) |
+			       QSGMII_PHY_TX_DRV_AMP(0xc);
+		break;
+	default: /* gmac 0 can't be set in SGMII mode */
+		dev_err(dev, "gmac id %d can't be in SGMII mode", gmac->id);
+		return -EINVAL;
+	}
+
+	/* Common params across all gmac id */
+	qsgmii_param |= QSGMII_PHY_CDR_EN |
+			QSGMII_PHY_RX_FRONT_EN |
+			QSGMII_PHY_RX_SIGNAL_DETECT_EN |
+			QSGMII_PHY_TX_DRIVER_EN |
+			QSGMII_PHY_QSGMII_EN |
+			QSGMII_PHY_PHASE_LOOP_GAIN(0x4) |
+			QSGMII_PHY_RX_INPUT_EQU(0x1) |
+			QSGMII_PHY_CDR_PI_SLEW(0x2);
+
+	regmap_write(gmac->qsgmii_csr, QSGMII_PHY_SGMII_CTL(gmac->id),
+		     qsgmii_param);
+
+	return 0;
+}
+
 static int ipq806x_gmac_probe(struct platform_device *pdev)
 {
 	struct plat_stmmacenet_data *plat_dat;
@@ -328,17 +397,9 @@ static int ipq806x_gmac_probe(struct platform_device *pdev)
 	regmap_write(gmac->nss_common, NSS_COMMON_CLK_GATE, val);
 
 	if (gmac->phy_mode == PHY_INTERFACE_MODE_SGMII) {
-		regmap_write(gmac->qsgmii_csr, QSGMII_PHY_SGMII_CTL(gmac->id),
-			     QSGMII_PHY_CDR_EN |
-			     QSGMII_PHY_RX_FRONT_EN |
-			     QSGMII_PHY_RX_SIGNAL_DETECT_EN |
-			     QSGMII_PHY_TX_DRIVER_EN |
-			     QSGMII_PHY_QSGMII_EN |
-			     0x4ul << QSGMII_PHY_PHASE_LOOP_GAIN_OFFSET |
-			     0x3ul << QSGMII_PHY_RX_DC_BIAS_OFFSET |
-			     0x1ul << QSGMII_PHY_RX_INPUT_EQU_OFFSET |
-			     0x2ul << QSGMII_PHY_CDR_PI_SLEW_OFFSET |
-			     0xCul << QSGMII_PHY_TX_DRV_AMP_OFFSET);
+		err = ipq806x_gmac_configure_qsgmii_params(gmac);
+		if (err)
+			goto err_remove_config_dt;
 	}
 
 	plat_dat->has_gmac = true;
-- 
2.36.1

[net-next PATCH 2/2] net: ethernet: stmmac: reset force speed bit for ipq806x

[Christian 'Ansuel' Marangi]

Some bootloader may set the force speed regs even if the actual
interface should use autonegotiation between PCS and PHY.
This cause the complete malfuction of the interface.

To fix this correctly reset the force speed regs if a fixed-link is not
defined in the DTS. With a fixed-link node correctly configure the
forced speed regs to handle any misconfiguration by the bootloader.

Reported-by: Mark Mentovai <mark@moxienet.com>
Co-developed-by: Mark Mentovai <mark@moxienet.com>
Signed-off-by: Mark Mentovai <mark@moxienet.com>
Signed-off-by: Christian 'Ansuel' Marangi <ansuelsmth@gmail.com>
---
 .../ethernet/stmicro/stmmac/dwmac-ipq806x.c   | 65 +++++++++++++++++++
 1 file changed, 65 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
index 832f442254d8..0f2f2bc6873d 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c
@@ -66,6 +66,17 @@
 #define NSS_COMMON_CLK_DIV_SGMII_100		4
 #define NSS_COMMON_CLK_DIV_SGMII_10		49
 
+#define QSGMII_PCS_ALL_CH_CTL			0x80
+#define QSGMII_PCS_CH_SPEED_FORCE		BIT(1)
+#define QSGMII_PCS_CH_SPEED_10			0x0
+#define QSGMII_PCS_CH_SPEED_100			BIT(2)
+#define QSGMII_PCS_CH_SPEED_1000		BIT(3)
+#define QSGMII_PCS_CH_SPEED_MASK		(QSGMII_PCS_CH_SPEED_FORCE | \
+						 QSGMII_PCS_CH_SPEED_10 | \
+						 QSGMII_PCS_CH_SPEED_100 | \
+						 QSGMII_PCS_CH_SPEED_1000)
+#define QSGMII_PCS_CH_SPEED_SHIFT(x)		((x) * 4)
+
 #define QSGMII_PCS_CAL_LCKDT_CTL		0x120
 #define QSGMII_PCS_CAL_LCKDT_CTL_RST		BIT(19)
 
@@ -253,6 +264,56 @@ static void ipq806x_gmac_fix_mac_speed(void *priv, unsigned int speed)
 	ipq806x_gmac_set_speed(gmac, speed);
 }
 
+static int
+ipq806x_gmac_configure_qsgmii_pcs_speed(struct ipq806x_gmac *gmac)
+{
+	struct platform_device *pdev = gmac->pdev;
+	struct device *dev = &pdev->dev;
+	struct device_node *dn;
+	int link_speed;
+	int val = 0;
+	int ret;
+
+	/* Some bootloader may apply wrong configuration and cause
+	 * not functioning port. If fixed link is not set,
+	 * reset the force speed bit.
+	 */
+	if (!of_phy_is_fixed_link(pdev->dev.of_node))
+		goto write;
+
+	dn = of_get_child_by_name(pdev->dev.of_node, "fixed-link");
+	ret = of_property_read_u32(dn, "speed", &link_speed);
+	if (ret) {
+		dev_err(dev, "found fixed-link node with no speed");
+		return ret;
+	}
+
+	of_node_put(dn);
+
+	val = QSGMII_PCS_CH_SPEED_FORCE;
+
+	switch (link_speed) {
+	case SPEED_1000:
+		val |= QSGMII_PCS_CH_SPEED_1000;
+		break;
+	case SPEED_100:
+		val |= QSGMII_PCS_CH_SPEED_100;
+		break;
+	case SPEED_10:
+		val |= QSGMII_PCS_CH_SPEED_10;
+		break;
+	}
+
+write:
+	regmap_update_bits(gmac->qsgmii_csr, QSGMII_PCS_ALL_CH_CTL,
+			   QSGMII_PCS_CH_SPEED_MASK <<
+			   QSGMII_PCS_CH_SPEED_SHIFT(gmac->id),
+			   val <<
+			   QSGMII_PCS_CH_SPEED_SHIFT(gmac->id));
+
+	return 0;
+}
+
 static const struct soc_device_attribute ipq806x_gmac_soc_v1[] = {
 	{
 		.revision = "1.*",
@@ -400,6 +461,10 @@ static int ipq806x_gmac_probe(struct platform_device *pdev)
 		err = ipq806x_gmac_configure_qsgmii_params(gmac);
 		if (err)
 			goto err_remove_config_dt;
+
+		err = ipq806x_gmac_configure_qsgmii_pcs_speed(gmac);
+		if (err)
+			goto err_remove_config_dt;
 	}
 
 	plat_dat->has_gmac = true;
-- 
2.36.1

Re: [net-next PATCH 2/2] net: ethernet: stmmac: reset force speed bit for ipq806x

[Jakub Kicinski]

On Thu,  9 Jun 2022 02:28:31 +0200 Christian 'Ansuel' Marangi wrote:
> +	dn = of_get_child_by_name(pdev->dev.of_node, "fixed-link");
> +	ret = of_property_read_u32(dn, "speed", &link_speed);
> +	if (ret) {
> +		dev_err(dev, "found fixed-link node with no speed");
> +		return ret;

Doesn't this return potentially leak the reference on dn?
You move the of_node_put() right before the if (ret) {

> +	}
> +
> +	of_node_put(dn);

Re: [net-next PATCH 2/2] net: ethernet: stmmac: reset force speed bit for ipq806x

[Ansuel Smith]

On Mon, Jun 13, 2022 at 10:49:17PM -0700, Jakub Kicinski wrote:
> On Thu,  9 Jun 2022 02:28:31 +0200 Christian 'Ansuel' Marangi wrote:
> > +	dn = of_get_child_by_name(pdev->dev.of_node, "fixed-link");
> > +	ret = of_property_read_u32(dn, "speed", &link_speed);
> > +	if (ret) {
> > +		dev_err(dev, "found fixed-link node with no speed");
> > +		return ret;
> 
> Doesn't this return potentially leak the reference on dn?
> You move the of_node_put() right before the if (ret) {
>

Totally right. Will fix in v2.

> > +	}
> > +
> > +	of_node_put(dn);

-- 
	Ansuel