RE: [PATCH net-next v4 1/5] net: stmmac: enable clause 45 mdio support

RE: [PATCH net-next v4 1/5] net: stmmac: enable clause 45 mdio support

[Jose Abreu]

From: Voon Weifeng <weifeng.voon@intel.com>
Date: Wed, May 29, 2019 at 17:58:23

> +static void stmmac_mdio_c45_setup(struct stmmac_priv *priv, int phyreg,
> +				  u32 *val, u32 *data)
> +{
> +	unsigned int reg_shift = priv->hw->mii.reg_shift;
> +	unsigned int reg_mask = priv->hw->mii.reg_mask;

Reverse christmas tree here. You also should align the function variables 
with the opening parenthesis of the function here and in the remaining 
series.

Otherwise this patch looks good to me.

Thanks,
Jose Miguel Abreu

RE: [PATCH net-next v4 2/5] net: stmmac: introducing support for DWC xPCS logics

[Jose Abreu]

From: Voon Weifeng <weifeng.voon@intel.com>
Date: Wed, May 29, 2019 at 17:58:24

> +/* Helpers for DW xPCS */
> +struct stmmac_xpcs {
> +	void (*xpcs_init)(struct net_device *ndev, int pcs_mode);
> +	void (*xpcs_ctrl_ane)(struct net_device *ndev, bool ane, bool loopback);
> +	void (*xpcs_get_adv_lp)(struct net_device *ndev, struct rgmii_adv *adv,
> +				int pcs_mode);
> +	int (*xpcs_irq_status)(struct net_device *ndev,
> +			       struct stmmac_extra_stats *x, int pcs_mode);
> +};

Please rename the structure to stmmac_xpcs_ops, to keep consistency with 
other helpers.

Thanks,
Jose Miguel Abreu

RE: [PATCH net-next v4 3/5] net: stmmac: add xpcs function hooks into main driver and ethtool

[Jose Abreu]

From: Voon Weifeng <weifeng.voon@intel.com>
Date: Wed, May 29, 2019 at 17:58:25

> +/**
> + *  xPCS_interrupt - xPCS ISR
> + *  @irq: interrupt number.
> + *  @dev_id: to pass the net device pointer.
> + *  Description: this is the xPCS interrupt service routine.
> + */

Please remove all JAVA docs from the series unless they are really 
useful. This looks like it's stating the obvious and just pollutes the 
eyes.

> +static irqreturn_t xpcs_interrupt(int irq, void *dev_id)
> +{
> +	struct net_device *ndev = (struct net_device *)dev_id;
> +	struct stmmac_priv *priv = netdev_priv(ndev);
> +	irqreturn_t ret = IRQ_NONE;
> +
> +	if (unlikely(!ndev)) {

This is a useless check because you already dereference the pointer when 
you assign "priv" variable.

Thanks,
Jose Miguel Abreu

RE: [PATCH net-next v4 4/5] net: stmmac: add xPCS functions for device with DWMACv5.1

[Jose Abreu]

From: Voon Weifeng <weifeng.voon@intel.com>
Date: Wed, May 29, 2019 at 17:58:26

> From: Ong Boon Leong <boon.leong.ong@intel.com>
> 
> We introduce support for driver that has v5.10 IP and is also using
> xPCS as MMD. This can be easily enabled for other product that integrates
> xPCS that is not using v5.00 IP.
> 
> Reviewed-by: Chuah Kim Tatt <kim.tatt.chuah@intel.com>
> Reviewed-by: Voon Weifeng <weifeng.voon@intel.com>
> Reviewed-by: Kweh Hock Leong <hock.leong.kweh@intel.com>
> Reviewed-by: Baoli Zhang <baoli.zhang@intel.com>
> Signed-off-by: Ong Boon Leong <boon.leong.ong@intel.com>
> Signed-off-by: Voon Weifeng <weifeng.voon@intel.com>

Acked-by: Jose Abreu <joabreu@synopsys.com>

Thanks,
Jose Miguel 
Abreu

RE: [PATCH net-next v4 5/5] net: stmmac: add EHL SGMII 1Gbps PCI info and PCI ID

[Jose Abreu]

From: Voon Weifeng <weifeng.voon@intel.com>
Date: Wed, May 29, 2019 at 17:58:27

> +	plat->axi = devm_kzalloc(&pdev->dev, sizeof(*plat->axi),
> +				 GFP_KERNEL);
> +	if (!plat->axi)
> +		return -ENOMEM;

Missing line break here.

> +	plat->axi->axi_lpi_en = 0;
> +	plat->axi->axi_xit_frm = 0;
> +	plat->axi->axi_wr_osr_lmt = 0;

This is not a valid value.

> +	plat->axi->axi_rd_osr_lmt = 2;
> +	plat->axi->axi_blen[0] = 4;
> +	plat->axi->axi_blen[1] = 8;
> +	plat->axi->axi_blen[2] = 16;
> +
> +	/* Set default value for multicast hash bins */
> +	plat->multicast_filter_bins = HASH_TABLE_SIZE;
> +
> +	/* Set default value for unicast filter entries */
> +	plat->unicast_filter_entries = 1;
> +
> +	/* Set the maxmtu to a default of JUMBO_LEN */
> +	plat->maxmtu = JUMBO_LEN;
> +
> +	/* Set 32KB fifo size as the advertised fifo size in
> +	 * the HW features is not the same as the HW implementation
> +	 */

Hmm ? I'm curious, can you explain ?

> +	plat->tx_fifo_size = 32768;
> +	plat->rx_fifo_size = 32768;
> +
> +	return 0;
> +}
> +
> +static int ehl_sgmii1g_data(struct pci_dev *pdev,
> +			    struct plat_stmmacenet_data *plat)
> +{
> +	int ret;
> +
> +	/* Set common default data first */
> +	ret = ehl_common_data(pdev, plat);
> +

Remove the extra line break please.

> +	if (ret)
> +		return ret;
> +

[PATCH net-next v4 0/5] net: stmmac: enable EHL SGMI

[Voon Weifeng]

This patch-set is to enable Ethernet controller
(DW Ethernet QoS and DW Ethernet PCS) with SGMII interface in Elkhart Lake.
The DW Ethernet PCS is the Physical Coding Sublayer that is between Ethernet
MAC and PHY and uses MDIO Clause-45 as Communication.

Kweh Hock Leong (1):
  net: stmmac: enable clause 45 mdio support

Ong Boon Leong (3):
  net: stmmac: introducing support for DWC xPCS logics
  net: stmmac: add xpcs function hooks into main driver and ethtool
  net: stmmac: add xPCS functions for device with DWMACv5.1

Voon Weifeng (1):
  net: stmmac: add EHL SGMII 1Gbps PCI info and PCI ID

 drivers/net/ethernet/stmicro/stmmac/Makefile       |   2 +-
 drivers/net/ethernet/stmicro/stmmac/common.h       |   1 +
 drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c  |  33 ++++
 drivers/net/ethernet/stmicro/stmmac/dwxpcs.c       | 198 +++++++++++++++++++++
 drivers/net/ethernet/stmicro/stmmac/dwxpcs.h       |  51 ++++++
 drivers/net/ethernet/stmicro/stmmac/hwif.c         |  42 ++++-
 drivers/net/ethernet/stmicro/stmmac/hwif.h         |  21 +++
 drivers/net/ethernet/stmicro/stmmac/stmmac.h       |   2 +
 .../net/ethernet/stmicro/stmmac/stmmac_ethtool.c   |  50 ++++--
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c  | 152 ++++++++++++----
 drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c  |  40 ++++-
 drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c   | 111 ++++++++++++
 include/linux/phy.h                                |   2 +
 include/linux/stmmac.h                             |   3 +
 14 files changed, 650 insertions(+), 58 deletions(-)
 create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwxpcs.c
 create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwxpcs.h

-- 
Changelog v2:
*Added support for the C37 AN for 1000BASE-X and SGMII (MAC side SGMII only)
*removed and submitted the fix patch to net
 "net: stmmac: dma channel control register need to be init first"
*Squash the following 2 patches and move it to the end of the patch set:
 "net: stmmac: add EHL SGMII 1Gbps platform data and PCI ID"
 "net: stmmac: add xPCS platform data for EHL"
Changelog v3:
*Applied reversed christmas tree
Changelog v4:
*Rebased to latest net-next
1.9.1

[PATCH net-next v4 1/5] net: stmmac: enable clause 45 mdio support

[Voon Weifeng]

From: Kweh Hock Leong <hock.leong.kweh@intel.com>

DWMAC4 is capable to support clause 45 mdio communication.
This patch enable the feature on stmmac_mdio_write() and
stmmac_mdio_read() by following phy_write_mmd() and
phy_read_mmd() mdiobus read write implementation format.

Reviewed-by: Li, Yifan <yifan2.li@intel.com>
Signed-off-by: Kweh Hock Leong <hock.leong.kweh@intel.com>
Signed-off-by: Ong Boon Leong <boon.leong.ong@intel.com>
Signed-off-by: Weifeng Voon <weifeng.voon@intel.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 40 ++++++++++++++++++-----
 include/linux/phy.h                               |  2 ++
 2 files changed, 34 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
index bdd351597b55..c3d8f1d145ec 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
@@ -34,11 +34,27 @@
 
 #define MII_BUSY 0x00000001
 #define MII_WRITE 0x00000002
+#define MII_DATA_MASK GENMASK(15, 0)
 
 /* GMAC4 defines */
 #define MII_GMAC4_GOC_SHIFT		2
+#define MII_GMAC4_REG_ADDR_SHIFT	16
 #define MII_GMAC4_WRITE			(1 << MII_GMAC4_GOC_SHIFT)
 #define MII_GMAC4_READ			(3 << MII_GMAC4_GOC_SHIFT)
+#define MII_GMAC4_C45E			BIT(1)
+
+static void stmmac_mdio_c45_setup(struct stmmac_priv *priv, int phyreg,
+				  u32 *val, u32 *data)
+{
+	unsigned int reg_shift = priv->hw->mii.reg_shift;
+	unsigned int reg_mask = priv->hw->mii.reg_mask;
+
+	*val |= MII_GMAC4_C45E;
+	*val &= ~reg_mask;
+	*val |= ((phyreg >> MII_DEVADDR_C45_SHIFT) << reg_shift) & reg_mask;
+
+	*data |= (phyreg & MII_REGADDR_C45_MASK) << MII_GMAC4_REG_ADDR_SHIFT;
+}
 
 /* XGMAC defines */
 #define MII_XGMAC_SADDR			BIT(18)
@@ -165,22 +181,26 @@ static int stmmac_mdio_read(struct mii_bus *bus, int phyaddr, int phyreg)
 	struct stmmac_priv *priv = netdev_priv(ndev);
 	unsigned int mii_address = priv->hw->mii.addr;
 	unsigned int mii_data = priv->hw->mii.data;
-	u32 v;
-	int data;
 	u32 value = MII_BUSY;
+	int data = 0;
+	u32 v;
 
 	value |= (phyaddr << priv->hw->mii.addr_shift)
 		& priv->hw->mii.addr_mask;
 	value |= (phyreg << priv->hw->mii.reg_shift) & priv->hw->mii.reg_mask;
 	value |= (priv->clk_csr << priv->hw->mii.clk_csr_shift)
 		& priv->hw->mii.clk_csr_mask;
-	if (priv->plat->has_gmac4)
+	if (priv->plat->has_gmac4) {
 		value |= MII_GMAC4_READ;
+		if (phyreg & MII_ADDR_C45)
+			stmmac_mdio_c45_setup(priv, phyreg, &value, &data);
+	}
 
 	if (readl_poll_timeout(priv->ioaddr + mii_address, v, !(v & MII_BUSY),
 			       100, 10000))
 		return -EBUSY;
 
+	writel(data, priv->ioaddr + mii_data);
 	writel(value, priv->ioaddr + mii_address);
 
 	if (readl_poll_timeout(priv->ioaddr + mii_address, v, !(v & MII_BUSY),
@@ -188,7 +208,7 @@ static int stmmac_mdio_read(struct mii_bus *bus, int phyaddr, int phyreg)
 		return -EBUSY;
 
 	/* Read the data from the MII data register */
-	data = (int)readl(priv->ioaddr + mii_data);
+	data = (int)readl(priv->ioaddr + mii_data) & MII_DATA_MASK;
 
 	return data;
 }
@@ -208,8 +228,9 @@ static int stmmac_mdio_write(struct mii_bus *bus, int phyaddr, int phyreg,
 	struct stmmac_priv *priv = netdev_priv(ndev);
 	unsigned int mii_address = priv->hw->mii.addr;
 	unsigned int mii_data = priv->hw->mii.data;
-	u32 v;
 	u32 value = MII_BUSY;
+	int data = phydata;
+	u32 v;
 
 	value |= (phyaddr << priv->hw->mii.addr_shift)
 		& priv->hw->mii.addr_mask;
@@ -217,10 +238,13 @@ static int stmmac_mdio_write(struct mii_bus *bus, int phyaddr, int phyreg,
 
 	value |= (priv->clk_csr << priv->hw->mii.clk_csr_shift)
 		& priv->hw->mii.clk_csr_mask;
-	if (priv->plat->has_gmac4)
+	if (priv->plat->has_gmac4) {
 		value |= MII_GMAC4_WRITE;
-	else
+		if (phyreg & MII_ADDR_C45)
+			stmmac_mdio_c45_setup(priv, phyreg, &value, &data);
+	} else {
 		value |= MII_WRITE;
+	}
 
 	/* Wait until any existing MII operation is complete */
 	if (readl_poll_timeout(priv->ioaddr + mii_address, v, !(v & MII_BUSY),
@@ -228,7 +252,7 @@ static int stmmac_mdio_write(struct mii_bus *bus, int phyaddr, int phyreg,
 		return -EBUSY;
 
 	/* Set the MII address register to write */
-	writel(phydata, priv->ioaddr + mii_data);
+	writel(data, priv->ioaddr + mii_data);
 	writel(value, priv->ioaddr + mii_address);
 
 	/* Wait until any existing MII operation is complete */
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 7180b1d1e5e3..27d267bde363 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -201,6 +201,8 @@ static inline const char *phy_modes(phy_interface_t interface)
 /* Or MII_ADDR_C45 into regnum for read/write on mii_bus to enable the 21 bit
    IEEE 802.3ae clause 45 addressing mode used by 10GIGE phy chips. */
 #define MII_ADDR_C45 (1<<30)
+#define MII_DEVADDR_C45_SHIFT	16
+#define MII_REGADDR_C45_MASK	GENMASK(15, 0)
 
 struct device;
 struct phylink;
-- 
1.9.1

[PATCH net-next v4 2/5] net: stmmac: introducing support for DWC xPCS logics

[Voon Weifeng]

From: Ong Boon Leong <boon.leong.ong@intel.com>

xPCS is DWC Ethernet Physical Coding Sublayer that may be integrated
into a GbE controller that uses DWC EQoS MAC controller. An example of
HW configuration is shown below:-

  <-----------------GBE Controller---------->|<--External PHY chip-->

  +----------+         +----+    +---+               +--------------+
  |   EQoS   | <-GMII->| DW |<-->|PHY| <-- SGMII --> | External GbE |
  |   MAC    |         |xPCS|    |IF |               | PHY Chip     |
  +----------+         +----+    +---+               +--------------+
         ^               ^                                  ^
         |               |                                  |
         +---------------------MDIO-------------------------+

xPCS is a Clause-45 MDIO Manageable Device (MMD) and we need a way to
differentiate it from external PHY chip that is discovered over MDIO.
Therefore, xpcs_phy_addr is introduced in stmmac platform data
(plat_stmmacenet_data) for differentiating xPCS from 'phy_addr' that
belongs to external PHY.

Basic functionalities for initializing xPCS and configuring auto
negotiation (AN), loopback, link status, AN advertisement and Link
Partner ability are implemented. The implementation supports the C37
AN for 1000BASE-X and SGMII (MAC side SGMII only).

Tested-by: Tan, Tee Min <tee.min.tan@intel.com>
Reviewed-by: Voon Weifeng <weifeng.voon@intel.com>
Reviewed-by: Kweh Hock Leong <hock.leong.kweh@intel.com>
Signed-off-by: Ong Boon Leong <boon.leong.ong@intel.com>
Signed-off-by: Voon Weifeng <weifeng.voon@intel.com>
---
 drivers/net/ethernet/stmicro/stmmac/Makefile |   2 +-
 drivers/net/ethernet/stmicro/stmmac/common.h |   1 +
 drivers/net/ethernet/stmicro/stmmac/dwxpcs.c | 198 +++++++++++++++++++++++++++
 drivers/net/ethernet/stmicro/stmmac/dwxpcs.h |  51 +++++++
 drivers/net/ethernet/stmicro/stmmac/hwif.h   |  19 +++
 include/linux/stmmac.h                       |   1 +
 6 files changed, 271 insertions(+), 1 deletion(-)
 create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwxpcs.c
 create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwxpcs.h

diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index c59926d96bcc..f007fb873455 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -6,7 +6,7 @@ stmmac-objs:= stmmac_main.o stmmac_ethtool.o stmmac_mdio.o ring_mode.o	\
 	      mmc_core.o stmmac_hwtstamp.o stmmac_ptp.o dwmac4_descs.o	\
 	      dwmac4_dma.o dwmac4_lib.o dwmac4_core.o dwmac5.o hwif.o \
 	      stmmac_tc.o dwxgmac2_core.o dwxgmac2_dma.o dwxgmac2_descs.o \
-	      $(stmmac-y)
+	      dwxpcs.o $(stmmac-y)
 
 stmmac-$(CONFIG_STMMAC_SELFTESTS) += stmmac_selftests.o
 
diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
index 1961fe9144ca..822786872796 100644
--- a/drivers/net/ethernet/stmicro/stmmac/common.h
+++ b/drivers/net/ethernet/stmicro/stmmac/common.h
@@ -419,6 +419,7 @@ struct mii_regs {
 
 struct mac_device_info {
 	const struct stmmac_ops *mac;
+	const struct stmmac_xpcs *xpcs;
 	const struct stmmac_desc_ops *desc;
 	const struct stmmac_dma_ops *dma;
 	const struct stmmac_mode_ops *mode;
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxpcs.c b/drivers/net/ethernet/stmicro/stmmac/dwxpcs.c
new file mode 100644
index 000000000000..081d3631afd2
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwxpcs.c
@@ -0,0 +1,198 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2019, Intel Corporation.
+ * DWC Ethernet Physical Coding Sublayer
+ */
+#include <linux/bitops.h>
+#include <linux/mdio.h>
+#include "dwxpcs.h"
+#include "stmmac.h"
+
+/* DW xPCS mdiobus_read and mdiobus_write helper functions */
+#define xpcs_read(dev, reg) \
+	mdiobus_read(priv->mii, xpcs_phy_addr, \
+		     MII_ADDR_C45 | (reg) | \
+		     ((dev) << MII_DEVADDR_C45_SHIFT))
+#define xpcs_write(dev, reg, val) \
+	mdiobus_write(priv->mii, xpcs_phy_addr, \
+		      MII_ADDR_C45 | (reg) | \
+		      ((dev) << MII_DEVADDR_C45_SHIFT), val)
+
+static void dw_xpcs_init(struct net_device *ndev, int pcs_mode)
+{
+	struct stmmac_priv *priv = netdev_priv(ndev);
+	int xpcs_phy_addr = priv->plat->xpcs_phy_addr;
+	int phydata;
+
+	if (pcs_mode == AN_CTRL_PCS_MD_C37_SGMII) {
+		/* For AN for SGMII mode, the settings are :-
+		 * 1) VR_MII_AN_CTRL Bit(2:1)[PCS_MODE] = 10b (SGMII AN)
+		 * 2) VR_MII_AN_CTRL Bit(3) [TX_CONFIG] = 0b (MAC side SGMII)
+		 *    DW xPCS used with DW EQoS MAC is always MAC
+		 *    side SGMII.
+		 * 3) VR_MII_AN_CTRL Bit(0) [AN_INTR_EN] = 1b (AN Interrupt
+		 *    enabled)
+		 * 4) VR_MII_DIG_CTRL1 Bit(9) [MAC_AUTO_SW] = 1b (Automatic
+		 *    speed mode change after SGMII AN complete)
+		 * Note: Since it is MAC side SGMII, there is no need to set
+		 *	 SR_MII_AN_ADV. MAC side SGMII receives AN Tx Config
+		 *	 from PHY about the link state change after C28 AN
+		 *	 is completed between PHY and Link Partner.
+		 */
+		phydata = xpcs_read(XPCS_MDIO_MII_MMD, MDIO_MII_MMD_AN_CTRL);
+		phydata &= ~MDIO_MII_MMD_AN_CTRL_PCS_MD;
+		phydata |= MDIO_MII_MMD_AN_CTRL_AN_INTR_EN |
+			   (AN_CTRL_PCS_MD_C37_SGMII <<
+			    MDIO_MII_MMD_AN_CTRL_PCS_MD_SHIFT &
+			    MDIO_MII_MMD_AN_CTRL_PCS_MD) |
+			   (AN_CTRL_TX_CONF_MAC_SIDE_SGMII <<
+			    MDIO_MII_MMD_AN_CTRL_TX_CONFIG_SHIFT);
+		xpcs_write(XPCS_MDIO_MII_MMD, MDIO_MII_MMD_AN_CTRL, phydata);
+
+		phydata = xpcs_read(XPCS_MDIO_MII_MMD,
+				    MDIO_MII_MMD_DIGITAL_CTRL_1);
+		phydata |= MDIO_MII_MMD_DIGI_CTRL_1_MAC_AUTO_SW;
+		xpcs_write(XPCS_MDIO_MII_MMD, MDIO_MII_MMD_DIGITAL_CTRL_1,
+			   phydata);
+	} else {
+		/* For AN for 1000BASE-X mode, the settings are :-
+		 * 1) VR_MII_AN_CTRL Bit(2:1)[PCS_MODE] = 00b (1000BASE-X C37)
+		 * 2) VR_MII_AN_CTRL Bit(0) [AN_INTR_EN] = 1b (AN Interrupt
+		 *    enabled)
+		 * 3) SR_MII_AN_ADV Bit(6)[FD] = 1b (Full Duplex)
+		 *    Note: Half Duplex is rarely used, so don't advertise.
+		 * 4) SR_MII_AN_ADV Bit(8:7)[PSE] = 11b (Sym & Asym Pause)
+		 */
+		phydata = xpcs_read(XPCS_MDIO_MII_MMD, MDIO_MII_MMD_AN_CTRL);
+		phydata &= ~MDIO_MII_MMD_AN_CTRL_PCS_MD;
+		phydata |= MDIO_MII_MMD_AN_CTRL_AN_INTR_EN |
+			   (AN_CTRL_PCS_MD_C37_1000BASEX <<
+			    MDIO_MII_MMD_AN_CTRL_PCS_MD_SHIFT &
+			    MDIO_MII_MMD_AN_CTRL_PCS_MD);
+		xpcs_write(XPCS_MDIO_MII_MMD, MDIO_MII_MMD_AN_CTRL, phydata);
+
+		phydata = xpcs_read(XPCS_MDIO_MII_MMD, MII_ADVERTISE);
+		phydata |= MDIO_MII_MMD_FD |
+			   (MDIO_MII_MMD_PSE_BOTH << MDIO_MII_MMD_PSE_SHIFT);
+		xpcs_write(XPCS_MDIO_MII_MMD, MII_ADVERTISE, phydata);
+	}
+}
+
+static void dw_xpcs_ctrl_ane(struct net_device *ndev, bool ane,
+			     bool loopback)
+{
+	struct stmmac_priv *priv = netdev_priv(ndev);
+	int xpcs_phy_addr = priv->plat->xpcs_phy_addr;
+
+	int phydata = xpcs_read(XPCS_MDIO_MII_MMD, MII_BMCR);
+
+	if (ane)
+		phydata |= (BMCR_ANENABLE | BMCR_ANRESTART);
+
+	if (loopback)
+		phydata |= BMCR_LOOPBACK;
+
+	xpcs_write(XPCS_MDIO_MII_MMD, MII_BMCR, phydata);
+}
+
+static void dw_xpcs_get_adv_lp(struct net_device *ndev,
+			       struct rgmii_adv *adv_lp,
+			       int pcs_mode)
+{
+	struct stmmac_priv *priv = netdev_priv(ndev);
+	int xpcs_phy_addr = priv->plat->xpcs_phy_addr;
+
+	/* AN Advertisement Ability */
+	int value = xpcs_read(XPCS_MDIO_MII_MMD, MII_ADVERTISE);
+
+	if (value & MDIO_MII_MMD_FD)
+		adv_lp->duplex = DUPLEX_FULL;
+	if (value & MDIO_MII_MMD_HD)
+		adv_lp->duplex = DUPLEX_HALF;
+	adv_lp->pause = (u32)((value & MDIO_MII_MMD_PSE) >>
+			      MDIO_MII_MMD_PSE_SHIFT);
+
+	/* Link Partner Ability - 1000BASE-X only*/
+	if (pcs_mode == AN_CTRL_PCS_MD_C37_1000BASEX) {
+		value = xpcs_read(XPCS_MDIO_MII_MMD, MII_LPA);
+		if (value & MDIO_MII_MMD_FD)
+			adv_lp->lp_duplex = DUPLEX_FULL;
+		if (value & MDIO_MII_MMD_HD)
+			adv_lp->lp_duplex = DUPLEX_HALF;
+		adv_lp->lp_pause = (u32)((value & MDIO_MII_MMD_PSE) >>
+					 MDIO_MII_MMD_PSE_SHIFT);
+	}
+}
+
+static void dw_xpcs_get_linkstatus(struct net_device *ndev,
+				   u16 an_stat,
+				   struct stmmac_extra_stats *x)
+{
+	/* Check the SGMII AN link status */
+	if (an_stat & AN_STAT_SGMII_AN_LNKSTS) {
+		int speed_value;
+
+		x->pcs_link = 1;
+
+		speed_value = ((an_stat & AN_STAT_SGMII_AN_SPEED) >>
+				AN_STAT_SGMII_AN_SPEED_SHIFT);
+		if (speed_value == AN_STAT_SGMII_AN_1000MBPS)
+			x->pcs_speed = SPEED_1000;
+		else if (speed_value == AN_STAT_SGMII_AN_100MBPS)
+			x->pcs_speed = SPEED_100;
+		else
+			x->pcs_speed = SPEED_10;
+
+		if (an_stat & AN_STAT_SGMII_AN_FD)
+			x->pcs_duplex = 1;
+		else
+			x->pcs_duplex = 0;
+
+		netdev_info(ndev, "Link is Up - %d/%s\n", (int)x->pcs_speed,
+			    x->pcs_duplex ? "Full" : "Half");
+	} else {
+		x->pcs_link = 0;
+		netdev_info(ndev, "Link is Down\n");
+	}
+}
+
+static int dw_xpcs_irq_status(struct net_device *ndev,
+			      struct stmmac_extra_stats *x,
+			      int pcs_mode)
+{
+	struct stmmac_priv *priv = netdev_priv(ndev);
+	int xpcs_phy_addr = priv->plat->xpcs_phy_addr;
+	int ret = IRQ_NONE;
+
+	/* AN status */
+	int an_stat = xpcs_read(XPCS_MDIO_MII_MMD, MDIO_MII_MMD_AN_STAT);
+
+	if (an_stat & AN_STAT_SGMII_AN_CMPLT) {
+		x->irq_pcs_ane_n++;
+
+		if (pcs_mode == AN_CTRL_PCS_MD_C37_SGMII) {
+			dw_xpcs_get_linkstatus(ndev, an_stat, x);
+		} else {
+			/* For 1000BASE-X AN, DW xPCS does not have register
+			 * to read the link state of 1000BASE-X C37 AN and
+			 * since 1000BASE-X is always 1000Mbps and FD, we
+			 * just set the default link here.
+			 */
+			x->pcs_link = 1;
+			x->pcs_duplex = 1;
+			x->pcs_speed = SPEED_1000;
+		}
+
+		/* Clear C37 AN complete status by writing zero */
+		xpcs_write(XPCS_MDIO_MII_MMD, MDIO_MII_MMD_AN_STAT, 0);
+		ret = IRQ_HANDLED;
+	}
+
+	return ret;
+}
+
+const struct stmmac_xpcs stmmac_xpcs_ops = {
+	.xpcs_init = dw_xpcs_init,
+	.xpcs_ctrl_ane = dw_xpcs_ctrl_ane,
+	.xpcs_get_adv_lp = dw_xpcs_get_adv_lp,
+	.xpcs_irq_status = dw_xpcs_irq_status,
+};
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxpcs.h b/drivers/net/ethernet/stmicro/stmmac/dwxpcs.h
new file mode 100644
index 000000000000..bd52ce80bf4e
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwxpcs.h
@@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (c) 2019, Intel Corporation.
+ * DWC Ethernet Physical Coding Sublayer
+ */
+#ifndef __DW_XPCS_H__
+#define __DW_XPCS_H__
+
+/* XPCS MII MMD Device Addresses */
+#define XPCS_MDIO_MII_MMD	MDIO_MMD_VEND2
+
+/* MII MMD registers offsets */
+#define MDIO_MII_MMD_DIGITAL_CTRL_1	0x8000	/* Digital Control 1 */
+#define MDIO_MII_MMD_AN_CTRL		0x8001	/* AN Control */
+#define MDIO_MII_MMD_AN_STAT		0x8002	/* AN Status */
+
+/* MII MMD SR AN Advertisement & Link Partner Ability are slightly
+ * different from MII_ADVERTISEMENT & MII_LPA in below fields:
+ */
+#define MDIO_MII_MMD_HD			BIT(6)	/* Half duplex */
+#define MDIO_MII_MMD_FD			BIT(5)	/* Full duplex */
+#define MDIO_MII_MMD_PSE_SHIFT		7	/* Pause Ability shift */
+#define MDIO_MII_MMD_PSE		GENMASK(8, 7)	/* Pause Ability */
+#define MDIO_MII_MMD_PSE_NO		0x0
+#define MDIO_MII_MMD_PSE_ASYM		0x1
+#define MDIO_MII_MMD_PSE_SYM		0x2
+#define MDIO_MII_MMD_PSE_BOTH		0x3
+
+/* Automatic Speed Mode Change for MAC side SGMII AN */
+#define MDIO_MII_MMD_DIGI_CTRL_1_MAC_AUTO_SW	BIT(9)
+
+/* MII MMD AN Control defines */
+#define MDIO_MII_MMD_AN_CTRL_TX_CONFIG_SHIFT	3 /* TX Config shift */
+#define AN_CTRL_TX_CONF_PHY_SIDE_SGMII		0x1 /* PHY side SGMII mode */
+#define AN_CTRL_TX_CONF_MAC_SIDE_SGMII		0x0 /* MAC side SGMII mode */
+#define MDIO_MII_MMD_AN_CTRL_PCS_MD_SHIFT	1  /* PCS Mode shift */
+#define MDIO_MII_MMD_AN_CTRL_PCS_MD	GENMASK(2, 1) /* PCS Mode */
+#define AN_CTRL_PCS_MD_C37_1000BASEX	0x0	/* C37 AN for 1000BASE-X */
+#define AN_CTRL_PCS_MD_C37_SGMII	0x2	/* C37 AN for SGMII */
+#define MDIO_MII_MMD_AN_CTRL_AN_INTR_EN	BIT(0)	/* AN Complete Intr Enable */
+
+/* MII MMD AN Status defines for SGMII AN Status */
+#define AN_STAT_SGMII_AN_CMPLT		BIT(0)	/* AN Complete Intr */
+#define AN_STAT_SGMII_AN_FD		BIT(1)	/* Full Duplex */
+#define AN_STAT_SGMII_AN_SPEED_SHIFT	2	/* AN Speed shift */
+#define AN_STAT_SGMII_AN_SPEED		GENMASK(3, 2)	/* AN Speed */
+#define AN_STAT_SGMII_AN_10MBPS		0x0	/* 10 Mbps */
+#define AN_STAT_SGMII_AN_100MBPS	0x1	/* 100 Mbps */
+#define AN_STAT_SGMII_AN_1000MBPS	0x2	/* 1000 Mbps */
+#define AN_STAT_SGMII_AN_LNKSTS		BIT(4)	/* Link Status */
+
+#endif /* __DW_XPCS_H__ */
diff --git a/drivers/net/ethernet/stmicro/stmmac/hwif.h b/drivers/net/ethernet/stmicro/stmmac/hwif.h
index 2acfbc70e3c8..8531d33f8eb9 100644
--- a/drivers/net/ethernet/stmicro/stmmac/hwif.h
+++ b/drivers/net/ethernet/stmicro/stmmac/hwif.h
@@ -398,6 +398,25 @@ struct stmmac_ops {
 #define stmmac_set_mac_loopback(__priv, __args...) \
 	stmmac_do_void_callback(__priv, mac, set_mac_loopback, __args)
 
+/* Helpers for DW xPCS */
+struct stmmac_xpcs {
+	void (*xpcs_init)(struct net_device *ndev, int pcs_mode);
+	void (*xpcs_ctrl_ane)(struct net_device *ndev, bool ane, bool loopback);
+	void (*xpcs_get_adv_lp)(struct net_device *ndev, struct rgmii_adv *adv,
+				int pcs_mode);
+	int (*xpcs_irq_status)(struct net_device *ndev,
+			       struct stmmac_extra_stats *x, int pcs_mode);
+};
+
+#define stmmac_xpcs_init(__priv, __args...) \
+	stmmac_do_void_callback(__priv, xpcs, xpcs_init, __args)
+#define stmmac_xpcs_ctrl_ane(__priv, __args...) \
+	stmmac_do_void_callback(__priv, xpcs, xpcs_ctrl_ane, __args)
+#define stmmac_xpcs_get_adv_lp(__priv, __args...) \
+	stmmac_do_void_callback(__priv, xpcs, xpcs_get_adv_lp, __args)
+#define stmmac_xpcs_irq_status(__priv, __args...) \
+	stmmac_do_callback(__priv, xpcs, xpcs_irq_status, __args)
+
 /* PTP and HW Timer helpers */
 struct stmmac_hwtimestamp {
 	void (*config_hw_tstamping) (void __iomem *ioaddr, u32 data);
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index 4335bd771ce5..b00e7951a66d 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -148,6 +148,7 @@ struct stmmac_txq_cfg {
 struct plat_stmmacenet_data {
 	int bus_id;
 	int phy_addr;
+	int xpcs_phy_addr;
 	int interface;
 	struct stmmac_mdio_bus_data *mdio_bus_data;
 	struct device_node *phy_node;
-- 
1.9.1

[PATCH net-next v4 3/5] net: stmmac: add xpcs function hooks into main driver and ethtool

[Voon Weifeng]

From: Ong Boon Leong <boon.leong.ong@intel.com>

With xPCS functions now ready, we add them into the main driver and
ethtool logics. To differentiate from EQoS MAC PCS and DWC Ethernet
xPCS, we introduce 'has_xpcs' in platform data as a mean to indicate
whether GBE controller includes xPCS or not.

To support platform-specific C37 AN PCS mode selection for MII MMD,
we introduce 'pcs_mode' in platform data.

The basic framework for xPCS interrupt handling is implemented too.

Reviewed-by: Chuah Kim Tatt <kim.tatt.chuah@intel.com>
Reviewed-by: Voon Weifeng <weifeng.voon@intel.com>
Reviewed-by: Kweh Hock Leong <hock.leong.kweh@intel.com>
Reviewed-by: Baoli Zhang <baoli.zhang@intel.com>
Signed-off-by: Ong Boon Leong <boon.leong.ong@intel.com>
Signed-off-by: Voon Weifeng <weifeng.voon@intel.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac.h       |   2 +
 .../net/ethernet/stmicro/stmmac/stmmac_ethtool.c   |  50 +++++--
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c  | 152 ++++++++++++++++-----
 include/linux/stmmac.h                             |   2 +
 4 files changed, 158 insertions(+), 48 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index a16ada8b8507..999311236521 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -36,6 +36,7 @@ struct stmmac_resources {
 	const char *mac;
 	int wol_irq;
 	int lpi_irq;
+	int xpcs_irq;
 	int irq;
 };
 
@@ -168,6 +169,7 @@ struct stmmac_priv {
 	int clk_csr;
 	struct timer_list eee_ctrl_timer;
 	int lpi_irq;
+	int xpcs_irq;
 	int eee_enabled;
 	int eee_active;
 	int tx_lpi_timer;
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
index cec51ba34296..be6edbe3d658 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
@@ -28,6 +28,7 @@
 
 #include "stmmac.h"
 #include "dwmac_dma.h"
+#include "dwxpcs.h"
 
 #define REG_SPACE_SIZE	0x1060
 #define MAC100_ETHTOOL_NAME	"st_mac100"
@@ -277,7 +278,8 @@ static int stmmac_ethtool_get_link_ksettings(struct net_device *dev,
 	struct phy_device *phy = dev->phydev;
 
 	if (priv->hw->pcs & STMMAC_PCS_RGMII ||
-	    priv->hw->pcs & STMMAC_PCS_SGMII) {
+	    priv->hw->pcs & STMMAC_PCS_SGMII ||
+	    priv->plat->pcs_mode == AN_CTRL_PCS_MD_C37_1000BASEX) {
 		struct rgmii_adv adv;
 		u32 supported, advertising, lp_advertising;
 
@@ -294,6 +296,11 @@ static int stmmac_ethtool_get_link_ksettings(struct net_device *dev,
 		if (stmmac_pcs_get_adv_lp(priv, priv->ioaddr, &adv))
 			return -EOPNOTSUPP;	/* should never happen indeed */
 
+		/* Get ADV & LPA is only application for 1000BASE-X C37.
+		 * For MAC side SGMII AN, get ADV & LPA from PHY.
+		 */
+		stmmac_xpcs_get_adv_lp(priv, dev, &adv, priv->plat->pcs_mode);
+
 		/* Encoding of PSE bits is defined in 802.3z, 37.2.1.4 */
 
 		ethtool_convert_link_mode_to_legacy_u32(
@@ -376,22 +383,23 @@ static int stmmac_ethtool_get_link_ksettings(struct net_device *dev,
 	int rc;
 
 	if (priv->hw->pcs & STMMAC_PCS_RGMII ||
-	    priv->hw->pcs & STMMAC_PCS_SGMII) {
-		u32 mask = ADVERTISED_Autoneg | ADVERTISED_Pause;
-
+	    priv->hw->pcs & STMMAC_PCS_SGMII ||
+	    priv->plat->pcs_mode == AN_CTRL_PCS_MD_C37_1000BASEX) {
 		/* Only support ANE */
 		if (cmd->base.autoneg != AUTONEG_ENABLE)
 			return -EINVAL;
 
-		mask &= (ADVERTISED_1000baseT_Half |
-			ADVERTISED_1000baseT_Full |
-			ADVERTISED_100baseT_Half |
-			ADVERTISED_100baseT_Full |
-			ADVERTISED_10baseT_Half |
-			ADVERTISED_10baseT_Full);
-
 		mutex_lock(&priv->lock);
 		stmmac_pcs_ctrl_ane(priv, priv->ioaddr, 1, priv->hw->ps, 0);
+
+		/* For 1000BASE-X C37 AN, it is always 1000Mbps. And, we only
+		 * support FD which is set by default in SR_MII_AN_ADV
+		 * during XPCS init. So, we don't need to set FD again.
+		 * For SGMII C37 AN, we let user to change link settings
+		 * through PHY since it is MAC side SGMII.
+		 */
+		stmmac_xpcs_ctrl_ane(priv, dev, 1, 0);
+
 		mutex_unlock(&priv->lock);
 
 		return 0;
@@ -457,6 +465,16 @@ static void stmmac_ethtool_gregs(struct net_device *dev,
 		pause->autoneg = 1;
 		if (!adv_lp.pause)
 			return;
+	} else if (priv->plat->pcs_mode == AN_CTRL_PCS_MD_C37_1000BASEX &&
+		   !stmmac_xpcs_get_adv_lp(priv, netdev, &adv_lp,
+					   priv->plat->pcs_mode)) {
+		/* DW xPCS 1000BASE-X C37 AN mode only because for MAC side
+		 * SGMII C37 AN, xPCS AN ADV is not set. See more comment in
+		 * dw_xpcs_init()
+		 */
+		pause->autoneg = 1;
+		if (!adv_lp.pause)
+			return;
 	} else {
 		if (!linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
 				       netdev->phydev->supported) ||
@@ -488,6 +506,16 @@ static void stmmac_ethtool_gregs(struct net_device *dev,
 		pause->autoneg = 1;
 		if (!adv_lp.pause)
 			return -EOPNOTSUPP;
+	} else if (priv->plat->pcs_mode == AN_CTRL_PCS_MD_C37_1000BASEX &&
+		   !stmmac_xpcs_get_adv_lp(priv, netdev, &adv_lp,
+					   priv->plat->pcs_mode)) {
+		/* DW xPCS 1000BASE-X C37 AN mode only because for MAC side
+		 * SGMII C37 AN, xPCS AN ADV is not set. See more comment in
+		 * dw_xpcs_init()
+		 */
+		pause->autoneg = 1;
+		if (!adv_lp.pause)
+			return -EOPNOTSUPP;
 	} else {
 		if (!linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
 				       phy->supported) ||
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index a87ec70b19f1..1c27503e983c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -112,6 +112,7 @@
 MODULE_PARM_DESC(chain_mode, "To use chain instead of ring mode");
 
 static irqreturn_t stmmac_interrupt(int irq, void *dev_id);
+static irqreturn_t xpcs_interrupt(int irq, void *dev_id);
 
 #ifdef CONFIG_DEBUG_FS
 static int stmmac_init_fs(struct net_device *dev);
@@ -848,6 +849,55 @@ static void stmmac_mac_flow_ctrl(struct stmmac_priv *priv, u32 duplex)
 			priv->pause, tx_cnt);
 }
 
+static bool mac_adjust_link(struct stmmac_priv *priv,
+			    int *speed, int *duplex)
+{
+	bool new_state = false;
+
+	u32 ctrl = readl(priv->ioaddr + MAC_CTRL_REG);
+
+	/* Now we make sure that we can be in full duplex mode.
+	 * If not, we operate in half-duplex mode.
+	 */
+	if (*duplex != priv->oldduplex) {
+		new_state = true;
+		if (!*duplex)
+			ctrl &= ~priv->hw->link.duplex;
+		else
+			ctrl |= priv->hw->link.duplex;
+		priv->oldduplex = *duplex;
+	}
+
+	if (*speed != priv->speed) {
+		new_state = true;
+		ctrl &= ~priv->hw->link.speed_mask;
+		switch (*speed) {
+		case SPEED_1000:
+			ctrl |= priv->hw->link.speed1000;
+			break;
+		case SPEED_100:
+			ctrl |= priv->hw->link.speed100;
+			break;
+		case SPEED_10:
+			ctrl |= priv->hw->link.speed10;
+			break;
+		default:
+			netif_warn(priv, link, priv->dev,
+				   "broken speed: %d\n", *speed);
+			*speed = SPEED_UNKNOWN;
+			break;
+		}
+		if (*speed != SPEED_UNKNOWN)
+			stmmac_hw_fix_mac_speed(priv);
+
+		priv->speed = *speed;
+	}
+
+	writel(ctrl, priv->ioaddr + MAC_CTRL_REG);
+
+	return new_state;
+}
+
 /**
  * stmmac_adjust_link - adjusts the link parameters
  * @dev: net device structure
@@ -869,47 +919,12 @@ static void stmmac_adjust_link(struct net_device *dev)
 	mutex_lock(&priv->lock);
 
 	if (phydev->link) {
-		u32 ctrl = readl(priv->ioaddr + MAC_CTRL_REG);
-
-		/* Now we make sure that we can be in full duplex mode.
-		 * If not, we operate in half-duplex mode. */
-		if (phydev->duplex != priv->oldduplex) {
-			new_state = true;
-			if (!phydev->duplex)
-				ctrl &= ~priv->hw->link.duplex;
-			else
-				ctrl |= priv->hw->link.duplex;
-			priv->oldduplex = phydev->duplex;
-		}
 		/* Flow Control operation */
 		if (phydev->pause)
 			stmmac_mac_flow_ctrl(priv, phydev->duplex);
 
-		if (phydev->speed != priv->speed) {
-			new_state = true;
-			ctrl &= ~priv->hw->link.speed_mask;
-			switch (phydev->speed) {
-			case SPEED_1000:
-				ctrl |= priv->hw->link.speed1000;
-				break;
-			case SPEED_100:
-				ctrl |= priv->hw->link.speed100;
-				break;
-			case SPEED_10:
-				ctrl |= priv->hw->link.speed10;
-				break;
-			default:
-				netif_warn(priv, link, priv->dev,
-					   "broken speed: %d\n", phydev->speed);
-				phydev->speed = SPEED_UNKNOWN;
-				break;
-			}
-			if (phydev->speed != SPEED_UNKNOWN)
-				stmmac_hw_fix_mac_speed(priv);
-			priv->speed = phydev->speed;
-		}
-
-		writel(ctrl, priv->ioaddr + MAC_CTRL_REG);
+		new_state = mac_adjust_link(priv, &phydev->speed,
+					    &phydev->duplex);
 
 		if (!priv->oldlink) {
 			new_state = true;
@@ -2541,6 +2556,9 @@ static int stmmac_hw_setup(struct net_device *dev, bool init_ptp)
 	/* Initialize MTL*/
 	stmmac_mtl_configuration(priv);
 
+	/* Initialize the xPCS PHY */
+	stmmac_xpcs_init(priv, dev, priv->plat->pcs_mode);
+
 	/* Initialize Safety Features */
 	stmmac_safety_feat_configuration(priv);
 
@@ -2582,6 +2600,8 @@ static int stmmac_hw_setup(struct net_device *dev, bool init_ptp)
 	if (priv->hw->pcs)
 		stmmac_pcs_ctrl_ane(priv, priv->hw, 1, priv->hw->ps, 0);
 
+	stmmac_xpcs_ctrl_ane(priv, dev, 1, 0);
+
 	/* set TX and RX rings length */
 	stmmac_set_rings_length(priv);
 
@@ -2697,11 +2717,27 @@ static int stmmac_open(struct net_device *dev)
 		}
 	}
 
+	/* xPCS IRQ line */
+	if (priv->xpcs_irq > 0) {
+		ret = request_irq(priv->xpcs_irq, xpcs_interrupt, IRQF_SHARED,
+				  dev->name, dev);
+		if (unlikely(ret < 0)) {
+			netdev_err(priv->dev,
+				   "%s: ERROR: allocating the xPCS IRQ %d (%d)\n",
+				   __func__, priv->xpcs_irq, ret);
+			goto xpcsirq_error;
+		}
+	}
+
 	stmmac_enable_all_queues(priv);
 	stmmac_start_all_queues(priv);
 
 	return 0;
 
+xpcsirq_error:
+	if (priv->lpi_irq > 0)
+		free_irq(priv->lpi_irq, dev);
+
 lpiirq_error:
 	if (priv->wol_irq != dev->irq)
 		free_irq(priv->wol_irq, dev);
@@ -3775,6 +3811,47 @@ static irqreturn_t stmmac_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
+/**
+ *  xPCS_interrupt - xPCS ISR
+ *  @irq: interrupt number.
+ *  @dev_id: to pass the net device pointer.
+ *  Description: this is the xPCS interrupt service routine.
+ */
+static irqreturn_t xpcs_interrupt(int irq, void *dev_id)
+{
+	struct net_device *ndev = (struct net_device *)dev_id;
+	struct stmmac_priv *priv = netdev_priv(ndev);
+	irqreturn_t ret = IRQ_NONE;
+
+	if (unlikely(!ndev)) {
+		netdev_err(priv->dev, "%s: invalid dev pointer\n",
+			   __func__);
+		return ret;
+	}
+
+	/* To handle xPCS interrupts */
+	ret = stmmac_xpcs_irq_status(priv, ndev, &priv->xstats,
+				     priv->plat->pcs_mode);
+
+	if (ret == IRQ_HANDLED) {
+		/* Keep the MAC's speed & duplex consistent with DW xPCS
+		 * because AN in DW xPCS does not update DW EQoS MAC
+		 * directly.
+		 */
+		int speed = (int)priv->xstats.pcs_speed;
+		int duplex = (int)priv->xstats.pcs_speed;
+
+		mac_adjust_link(priv, &speed, &duplex);
+
+		if (priv->xstats.pcs_link)
+			netif_carrier_on(ndev);
+		else
+			netif_carrier_off(ndev);
+	}
+
+	return ret;
+}
+
 #ifdef CONFIG_NET_POLL_CONTROLLER
 /* Polling receive - used by NETCONSOLE and other diagnostic tools
  * to allow network I/O with interrupts disabled.
@@ -4264,6 +4341,7 @@ int stmmac_dvr_probe(struct device *device,
 	priv->dev->irq = res->irq;
 	priv->wol_irq = res->wol_irq;
 	priv->lpi_irq = res->lpi_irq;
+	priv->xpcs_irq = res->xpcs_irq;
 
 	if (!IS_ERR_OR_NULL(res->mac))
 		memcpy(priv->dev->dev_addr, res->mac, ETH_ALEN);
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index b00e7951a66d..c6778abd41c5 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -189,6 +189,8 @@ struct plat_stmmacenet_data {
 	struct reset_control *stmmac_rst;
 	struct stmmac_axi *axi;
 	int has_gmac4;
+	bool has_xpcs;
+	int pcs_mode;
 	bool has_sun8i;
 	bool tso_en;
 	int mac_port_sel_speed;
-- 
1.9.1

[PATCH net-next v4 4/5] net: stmmac: add xPCS functions for device with DWMACv5.1

[Voon Weifeng]

From: Ong Boon Leong <boon.leong.ong@intel.com>

We introduce support for driver that has v5.10 IP and is also using
xPCS as MMD. This can be easily enabled for other product that integrates
xPCS that is not using v5.00 IP.

Reviewed-by: Chuah Kim Tatt <kim.tatt.chuah@intel.com>
Reviewed-by: Voon Weifeng <weifeng.voon@intel.com>
Reviewed-by: Kweh Hock Leong <hock.leong.kweh@intel.com>
Reviewed-by: Baoli Zhang <baoli.zhang@intel.com>
Signed-off-by: Ong Boon Leong <boon.leong.ong@intel.com>
Signed-off-by: Voon Weifeng <weifeng.voon@intel.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c | 33 ++++++++++++++++++
 drivers/net/ethernet/stmicro/stmmac/hwif.c        | 42 ++++++++++++++++++++++-
 drivers/net/ethernet/stmicro/stmmac/hwif.h        |  2 ++
 3 files changed, 76 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
index 5e98da4e14f9..3afb60f2775c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
@@ -824,6 +824,39 @@ static void dwmac4_set_mac_loopback(void __iomem *ioaddr, bool enable)
 	.set_mac_loopback = dwmac4_set_mac_loopback,
 };
 
+const struct stmmac_ops dwmac510_xpcs_ops = {
+	.core_init = dwmac4_core_init,
+	.set_mac = stmmac_dwmac4_set_mac,
+	.rx_ipc = dwmac4_rx_ipc_enable,
+	.rx_queue_enable = dwmac4_rx_queue_enable,
+	.rx_queue_prio = dwmac4_rx_queue_priority,
+	.tx_queue_prio = dwmac4_tx_queue_priority,
+	.rx_queue_routing = dwmac4_rx_queue_routing,
+	.prog_mtl_rx_algorithms = dwmac4_prog_mtl_rx_algorithms,
+	.prog_mtl_tx_algorithms = dwmac4_prog_mtl_tx_algorithms,
+	.set_mtl_tx_queue_weight = dwmac4_set_mtl_tx_queue_weight,
+	.map_mtl_to_dma = dwmac4_map_mtl_dma,
+	.config_cbs = dwmac4_config_cbs,
+	.dump_regs = dwmac4_dump_regs,
+	.host_irq_status = dwmac4_irq_status,
+	.host_mtl_irq_status = dwmac4_irq_mtl_status,
+	.flow_ctrl = dwmac4_flow_ctrl,
+	.pmt = dwmac4_pmt,
+	.set_umac_addr = dwmac4_set_umac_addr,
+	.get_umac_addr = dwmac4_get_umac_addr,
+	.set_eee_mode = dwmac4_set_eee_mode,
+	.reset_eee_mode = dwmac4_reset_eee_mode,
+	.set_eee_timer = dwmac4_set_eee_timer,
+	.set_eee_pls = dwmac4_set_eee_pls,
+	.debug = dwmac4_debug,
+	.set_filter = dwmac4_set_filter,
+	.safety_feat_config = dwmac5_safety_feat_config,
+	.safety_feat_irq_status = dwmac5_safety_feat_irq_status,
+	.safety_feat_dump = dwmac5_safety_feat_dump,
+	.rxp_config = dwmac5_rxp_config,
+	.flex_pps_config = dwmac5_flex_pps_config,
+};
+
 int dwmac4_setup(struct stmmac_priv *priv)
 {
 	struct mac_device_info *mac = priv->hw;
diff --git a/drivers/net/ethernet/stmicro/stmmac/hwif.c b/drivers/net/ethernet/stmicro/stmmac/hwif.c
index 6c61b753b55e..6364fc89f0e4 100644
--- a/drivers/net/ethernet/stmicro/stmmac/hwif.c
+++ b/drivers/net/ethernet/stmicro/stmmac/hwif.c
@@ -73,11 +73,13 @@ static int stmmac_dwmac4_quirks(struct stmmac_priv *priv)
 	bool gmac;
 	bool gmac4;
 	bool xgmac;
+	bool has_xpcs;
 	u32 min_id;
 	const struct stmmac_regs_off regs;
 	const void *desc;
 	const void *dma;
 	const void *mac;
+	const void *xpcs;
 	const void *hwtimestamp;
 	const void *mode;
 	const void *tc;
@@ -90,6 +92,7 @@ static int stmmac_dwmac4_quirks(struct stmmac_priv *priv)
 		.gmac = false,
 		.gmac4 = false,
 		.xgmac = false,
+		.has_xpcs = false,
 		.min_id = 0,
 		.regs = {
 			.ptp_off = PTP_GMAC3_X_OFFSET,
@@ -98,6 +101,7 @@ static int stmmac_dwmac4_quirks(struct stmmac_priv *priv)
 		.desc = NULL,
 		.dma = &dwmac100_dma_ops,
 		.mac = &dwmac100_ops,
+		.xpcs = NULL,
 		.hwtimestamp = &stmmac_ptp,
 		.mode = NULL,
 		.tc = NULL,
@@ -108,6 +112,7 @@ static int stmmac_dwmac4_quirks(struct stmmac_priv *priv)
 		.gmac = true,
 		.gmac4 = false,
 		.xgmac = false,
+		.has_xpcs = false,
 		.min_id = 0,
 		.regs = {
 			.ptp_off = PTP_GMAC3_X_OFFSET,
@@ -116,6 +121,7 @@ static int stmmac_dwmac4_quirks(struct stmmac_priv *priv)
 		.desc = NULL,
 		.dma = &dwmac1000_dma_ops,
 		.mac = &dwmac1000_ops,
+		.xpcs = NULL,
 		.hwtimestamp = &stmmac_ptp,
 		.mode = NULL,
 		.tc = NULL,
@@ -126,6 +132,7 @@ static int stmmac_dwmac4_quirks(struct stmmac_priv *priv)
 		.gmac = false,
 		.gmac4 = true,
 		.xgmac = false,
+		.has_xpcs = false,
 		.min_id = 0,
 		.regs = {
 			.ptp_off = PTP_GMAC4_OFFSET,
@@ -133,6 +140,7 @@ static int stmmac_dwmac4_quirks(struct stmmac_priv *priv)
 		},
 		.desc = &dwmac4_desc_ops,
 		.dma = &dwmac4_dma_ops,
+		.xpcs = NULL,
 		.mac = &dwmac4_ops,
 		.hwtimestamp = &stmmac_ptp,
 		.mode = NULL,
@@ -144,6 +152,7 @@ static int stmmac_dwmac4_quirks(struct stmmac_priv *priv)
 		.gmac = false,
 		.gmac4 = true,
 		.xgmac = false,
+		.has_xpcs = false,
 		.min_id = DWMAC_CORE_4_00,
 		.regs = {
 			.ptp_off = PTP_GMAC4_OFFSET,
@@ -152,6 +161,7 @@ static int stmmac_dwmac4_quirks(struct stmmac_priv *priv)
 		.desc = &dwmac4_desc_ops,
 		.dma = &dwmac4_dma_ops,
 		.mac = &dwmac410_ops,
+		.xpcs = NULL,
 		.hwtimestamp = &stmmac_ptp,
 		.mode = &dwmac4_ring_mode_ops,
 		.tc = &dwmac510_tc_ops,
@@ -162,6 +172,7 @@ static int stmmac_dwmac4_quirks(struct stmmac_priv *priv)
 		.gmac = false,
 		.gmac4 = true,
 		.xgmac = false,
+		.has_xpcs = false,
 		.min_id = DWMAC_CORE_4_10,
 		.regs = {
 			.ptp_off = PTP_GMAC4_OFFSET,
@@ -170,6 +181,7 @@ static int stmmac_dwmac4_quirks(struct stmmac_priv *priv)
 		.desc = &dwmac4_desc_ops,
 		.dma = &dwmac410_dma_ops,
 		.mac = &dwmac410_ops,
+		.xpcs = NULL,
 		.hwtimestamp = &stmmac_ptp,
 		.mode = &dwmac4_ring_mode_ops,
 		.tc = &dwmac510_tc_ops,
@@ -180,6 +192,7 @@ static int stmmac_dwmac4_quirks(struct stmmac_priv *priv)
 		.gmac = false,
 		.gmac4 = true,
 		.xgmac = false,
+		.has_xpcs = false,
 		.min_id = DWMAC_CORE_5_10,
 		.regs = {
 			.ptp_off = PTP_GMAC4_OFFSET,
@@ -188,6 +201,7 @@ static int stmmac_dwmac4_quirks(struct stmmac_priv *priv)
 		.desc = &dwmac4_desc_ops,
 		.dma = &dwmac410_dma_ops,
 		.mac = &dwmac510_ops,
+		.xpcs = NULL,
 		.hwtimestamp = &stmmac_ptp,
 		.mode = &dwmac4_ring_mode_ops,
 		.tc = &dwmac510_tc_ops,
@@ -198,6 +212,7 @@ static int stmmac_dwmac4_quirks(struct stmmac_priv *priv)
 		.gmac = false,
 		.gmac4 = false,
 		.xgmac = true,
+		.has_xpcs = false,
 		.min_id = DWXGMAC_CORE_2_10,
 		.regs = {
 			.ptp_off = PTP_XGMAC_OFFSET,
@@ -206,13 +221,34 @@ static int stmmac_dwmac4_quirks(struct stmmac_priv *priv)
 		.desc = &dwxgmac210_desc_ops,
 		.dma = &dwxgmac210_dma_ops,
 		.mac = &dwxgmac210_ops,
+		.xpcs = NULL,
 		.hwtimestamp = &stmmac_ptp,
 		.mode = NULL,
 		.tc = &dwmac510_tc_ops,
 		.mmc = NULL,
 		.setup = dwxgmac2_setup,
 		.quirks = NULL,
-	},
+	}, {
+		.gmac = false,
+		.gmac4 = true,
+		.xgmac = false,
+		.has_xpcs = true,
+		.min_id = DWMAC_CORE_5_10,
+		.regs = {
+			.ptp_off = PTP_GMAC4_OFFSET,
+			.mmc_off = MMC_GMAC4_OFFSET,
+		},
+		.desc = &dwmac4_desc_ops,
+		.dma = &dwmac410_dma_ops,
+		.mac = &dwmac510_xpcs_ops,
+		.xpcs = &stmmac_xpcs_ops,
+		.hwtimestamp = &stmmac_ptp,
+		.mode = &dwmac4_ring_mode_ops,
+		.tc = &dwmac510_tc_ops,
+		.mmc = &dwmac_mmc_ops,
+		.setup = dwmac4_setup,
+		.quirks = NULL,
+	}
 };
 
 int stmmac_hwif_init(struct stmmac_priv *priv)
@@ -220,6 +256,7 @@ int stmmac_hwif_init(struct stmmac_priv *priv)
 	bool needs_xgmac = priv->plat->has_xgmac;
 	bool needs_gmac4 = priv->plat->has_gmac4;
 	bool needs_gmac = priv->plat->has_gmac;
+	bool needs_xpcs = priv->plat->has_xpcs;
 	const struct stmmac_hwif_entry *entry;
 	struct mac_device_info *mac;
 	bool needs_setup = true;
@@ -264,6 +301,8 @@ int stmmac_hwif_init(struct stmmac_priv *priv)
 			continue;
 		if (needs_xgmac ^ entry->xgmac)
 			continue;
+		if (needs_xpcs ^ entry->has_xpcs)
+			continue;
 		/* Use synopsys_id var because some setups can override this */
 		if (priv->synopsys_id < entry->min_id)
 			continue;
@@ -272,6 +311,7 @@ int stmmac_hwif_init(struct stmmac_priv *priv)
 		mac->desc = mac->desc ? : entry->desc;
 		mac->dma = mac->dma ? : entry->dma;
 		mac->mac = mac->mac ? : entry->mac;
+		mac->xpcs = mac->xpcs ? : entry->xpcs;
 		mac->ptp = mac->ptp ? : entry->hwtimestamp;
 		mac->mode = mac->mode ? : entry->mode;
 		mac->tc = mac->tc ? : entry->tc;
diff --git a/drivers/net/ethernet/stmicro/stmmac/hwif.h b/drivers/net/ethernet/stmicro/stmmac/hwif.h
index 8531d33f8eb9..9726245d10b4 100644
--- a/drivers/net/ethernet/stmicro/stmmac/hwif.h
+++ b/drivers/net/ethernet/stmicro/stmmac/hwif.h
@@ -509,6 +509,7 @@ struct stmmac_regs_off {
 };
 
 extern const struct stmmac_ops dwmac100_ops;
+extern const struct stmmac_xpcs stmmac_xpcs_ops;
 extern const struct stmmac_dma_ops dwmac100_dma_ops;
 extern const struct stmmac_ops dwmac1000_ops;
 extern const struct stmmac_dma_ops dwmac1000_dma_ops;
@@ -517,6 +518,7 @@ struct stmmac_regs_off {
 extern const struct stmmac_ops dwmac410_ops;
 extern const struct stmmac_dma_ops dwmac410_dma_ops;
 extern const struct stmmac_ops dwmac510_ops;
+extern const struct stmmac_ops dwmac510_xpcs_ops;
 extern const struct stmmac_tc_ops dwmac510_tc_ops;
 extern const struct stmmac_ops dwxgmac210_ops;
 extern const struct stmmac_dma_ops dwxgmac210_dma_ops;
-- 
1.9.1

[PATCH net-next v4 5/5] net: stmmac: add EHL SGMII 1Gbps PCI info and PCI ID

[Voon Weifeng]

Added EHL SGMII 1Gbps PCI ID. Different MII and speed will have
different PCI ID.

Signed-off-by: Voon Weifeng <weifeng.voon@intel.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c | 111 +++++++++++++++++++++++
 1 file changed, 111 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c
index 7cbc01f316fa..f2225c1eafc2 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c
@@ -23,6 +23,7 @@
 #include <linux/dmi.h>
 
 #include "stmmac.h"
+#include "dwxpcs.h"
 
 /*
  * This struct is used to associate PCI Function of MAC controller on a board,
@@ -118,6 +119,113 @@ static int stmmac_default_data(struct pci_dev *pdev,
 	.setup = stmmac_default_data,
 };
 
+static int ehl_common_data(struct pci_dev *pdev,
+			   struct plat_stmmacenet_data *plat)
+{
+	int i;
+
+	plat->bus_id = 1;
+	plat->phy_addr = 0;
+	plat->clk_csr = 5;
+	plat->has_gmac = 0;
+	plat->has_gmac4 = 1;
+	plat->xpcs_phy_addr = 0x16;
+	plat->pcs_mode = AN_CTRL_PCS_MD_C37_SGMII;
+	plat->force_sf_dma_mode = 0;
+	plat->tso_en = 1;
+
+	plat->rx_queues_to_use = 8;
+	plat->tx_queues_to_use = 8;
+	plat->rx_sched_algorithm = MTL_RX_ALGORITHM_SP;
+
+	for (i = 0; i < plat->rx_queues_to_use; i++) {
+		plat->rx_queues_cfg[i].mode_to_use = MTL_QUEUE_DCB;
+		plat->rx_queues_cfg[i].chan = i;
+
+		/* Disable Priority config by default */
+		plat->rx_queues_cfg[i].use_prio = false;
+
+		/* Disable RX queues routing by default */
+		plat->rx_queues_cfg[i].pkt_route = 0x0;
+	}
+
+	for (i = 0; i < plat->tx_queues_to_use; i++) {
+		plat->tx_queues_cfg[i].mode_to_use = MTL_QUEUE_DCB;
+
+		/* Disable Priority config by default */
+		plat->tx_queues_cfg[i].use_prio = false;
+	}
+
+	plat->tx_sched_algorithm = MTL_TX_ALGORITHM_WRR;
+	plat->tx_queues_cfg[0].weight = 0x09;
+	plat->tx_queues_cfg[1].weight = 0x0A;
+	plat->tx_queues_cfg[2].weight = 0x0B;
+	plat->tx_queues_cfg[3].weight = 0x0C;
+	plat->tx_queues_cfg[4].weight = 0x0D;
+	plat->tx_queues_cfg[5].weight = 0x0E;
+	plat->tx_queues_cfg[6].weight = 0x0F;
+	plat->tx_queues_cfg[7].weight = 0x10;
+
+	plat->mdio_bus_data->phy_reset = NULL;
+	plat->mdio_bus_data->phy_mask = 0;
+
+	plat->dma_cfg->pbl = 32;
+	plat->dma_cfg->pblx8 = true;
+	plat->dma_cfg->fixed_burst = 0;
+	plat->dma_cfg->mixed_burst = 0;
+	plat->dma_cfg->aal = 0;
+
+	plat->axi = devm_kzalloc(&pdev->dev, sizeof(*plat->axi),
+				 GFP_KERNEL);
+	if (!plat->axi)
+		return -ENOMEM;
+	plat->axi->axi_lpi_en = 0;
+	plat->axi->axi_xit_frm = 0;
+	plat->axi->axi_wr_osr_lmt = 0;
+	plat->axi->axi_rd_osr_lmt = 2;
+	plat->axi->axi_blen[0] = 4;
+	plat->axi->axi_blen[1] = 8;
+	plat->axi->axi_blen[2] = 16;
+
+	/* Set default value for multicast hash bins */
+	plat->multicast_filter_bins = HASH_TABLE_SIZE;
+
+	/* Set default value for unicast filter entries */
+	plat->unicast_filter_entries = 1;
+
+	/* Set the maxmtu to a default of JUMBO_LEN */
+	plat->maxmtu = JUMBO_LEN;
+
+	/* Set 32KB fifo size as the advertised fifo size in
+	 * the HW features is not the same as the HW implementation
+	 */
+	plat->tx_fifo_size = 32768;
+	plat->rx_fifo_size = 32768;
+
+	return 0;
+}
+
+static int ehl_sgmii1g_data(struct pci_dev *pdev,
+			    struct plat_stmmacenet_data *plat)
+{
+	int ret;
+
+	/* Set common default data first */
+	ret = ehl_common_data(pdev, plat);
+
+	if (ret)
+		return ret;
+
+	plat->interface = PHY_INTERFACE_MODE_SGMII;
+	plat->has_xpcs = 1;
+
+	return 0;
+}
+
+static struct stmmac_pci_info ehl_sgmii1g_pci_info = {
+	.setup = ehl_sgmii1g_data,
+};
+
 static const struct stmmac_pci_func_data galileo_stmmac_func_data[] = {
 	{
 		.func = 6,
@@ -290,6 +398,7 @@ static int stmmac_pci_probe(struct pci_dev *pdev,
 	res.addr = pcim_iomap_table(pdev)[i];
 	res.wol_irq = pdev->irq;
 	res.irq = pdev->irq;
+	res.xpcs_irq = 0;
 
 	return stmmac_dvr_probe(&pdev->dev, plat, &res);
 }
@@ -359,6 +468,7 @@ static int __maybe_unused stmmac_pci_resume(struct device *dev)
 
 #define STMMAC_QUARK_ID  0x0937
 #define STMMAC_DEVICE_ID 0x1108
+#define STMMAC_EHL_SGMII1G_ID   0x4b31
 
 #define STMMAC_DEVICE(vendor_id, dev_id, info)	{	\
 	PCI_VDEVICE(vendor_id, dev_id),			\
@@ -369,6 +479,7 @@ static int __maybe_unused stmmac_pci_resume(struct device *dev)
 	STMMAC_DEVICE(STMMAC, STMMAC_DEVICE_ID, stmmac_pci_info),
 	STMMAC_DEVICE(STMICRO, PCI_DEVICE_ID_STMICRO_MAC, stmmac_pci_info),
 	STMMAC_DEVICE(INTEL, STMMAC_QUARK_ID, quark_pci_info),
+	STMMAC_DEVICE(INTEL, STMMAC_EHL_SGMII1G_ID, ehl_sgmii1g_pci_info),
 	{}
 };
 
-- 
1.9.1

RE: [PATCH net-next v4 1/5] net: stmmac: enable clause 45 mdio support

[Voon, Weifeng]

> > +static void stmmac_mdio_c45_setup(struct stmmac_priv *priv, int phyreg,
> > +				  u32 *val, u32 *data)
> > +{
> > +	unsigned int reg_shift = priv->hw->mii.reg_shift;
> > +	unsigned int reg_mask = priv->hw->mii.reg_mask;
> 
> Reverse christmas tree here. You also should align the function variables with
> the opening parenthesis of the function here and in the remaining series.
> 
> Otherwise this patch looks good to me.

It is already reversed Christmas tree. Somehow each of the character's width in the
email is not equal. As you can see that the first line of assignment is having more
character than the second line of assignment.
The alignment is also correct when I check it after doing a git am.

Regards,
Weifeng

> 
> Thanks,
> Jose Miguel Abreu

RE: [PATCH net-next v4 5/5] net: stmmac: add EHL SGMII 1Gbps PCI info and PCI ID

[Voon, Weifeng]

> 
> > +	plat->axi->axi_lpi_en = 0;
> > +	plat->axi->axi_xit_frm = 0;
> > +	plat->axi->axi_wr_osr_lmt = 0;
> 
> This is not a valid value.

Can you please explained why is not a valid value? And what should
be the recommended value? 
Databook mentioned that "Maximum outstanding requests =
WR_OSR_LMT + 1"

> 
> > +	plat->axi->axi_rd_osr_lmt = 2;
> > +	plat->axi->axi_blen[0] = 4;
> > +	plat->axi->axi_blen[1] = 8;
> > +	plat->axi->axi_blen[2] = 16;
> > +
> > +	/* Set default value for multicast hash bins */
> > +	plat->multicast_filter_bins = HASH_TABLE_SIZE;
> > +
> > +	/* Set default value for unicast filter entries */
> > +	plat->unicast_filter_entries = 1;
> > +
> > +	/* Set the maxmtu to a default of JUMBO_LEN */
> > +	plat->maxmtu = JUMBO_LEN;
> > +
> > +	/* Set 32KB fifo size as the advertised fifo size in
> > +	 * the HW features is not the same as the HW implementation
> > +	 */
> 
> Hmm ? I'm curious, can you explain ?

The RTL comes with a 64KB selection in HW features. But the HW implementation
only uses a 32KB RAM. This will be documented as errata.  

> 
> > +	plat->tx_fifo_size = 32768;
> > +	plat->rx_fifo_size = 32768;
> > +
> > +	return 0;
> > +}
> > +
> > +static int ehl_sgmii1g_data(struct pci_dev *pdev,
> > +			    struct plat_stmmacenet_data *plat) {
> > +	int ret;
> > +
> > +	/* Set common default data first */
> > +	ret = ehl_common_data(pdev, plat);
> > +
> 

Regards
Weifeng

Re: [PATCH net-next v4 1/5] net: stmmac: enable clause 45 mdio support

[Andrew Lunn]

On Wed, May 29, 2019 at 05:39:44PM +0000, Voon, Weifeng wrote:
> > > +static void stmmac_mdio_c45_setup(struct stmmac_priv *priv, int phyreg,
> > > +				  u32 *val, u32 *data)
> > > +{
> > > +	unsigned int reg_shift = priv->hw->mii.reg_shift;
> > > +	unsigned int reg_mask = priv->hw->mii.reg_mask;
> > 
> > Reverse christmas tree here. You also should align the function variables with
> > the opening parenthesis of the function here and in the remaining series.
> > 
> > Otherwise this patch looks good to me.
> 
> It is already reversed Christmas tree.

Yes.

> Somehow each of the character's width in the
> email is not equal.

Sounds like somebody is using a proportional font in there email
client. Bad idea.

	Andrew