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Message-Id: <20220316125529.1489045-1-o.rempel@pengutronix.de>
Date: Wed, 16 Mar 2022 13:55:29 +0100
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Woojung Huh <woojung.huh@...rochip.com>,
UNGLinuxDriver@...rochip.com, Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>,
Vivien Didelot <vivien.didelot@...il.com>,
Vladimir Oltean <olteanv@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>
Cc: Oleksij Rempel <o.rempel@...gutronix.de>, kernel@...gutronix.de,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next v1 1/1] net: dsa: microchip: ksz8795: handle eee specif erratum
According to erratum described in DS80000687C[1]: "Module 2: Link drops with
some EEE link partners.", we need to "Disable the EEE next page
exchange in EEE Global Register 2"
1 - https://ww1.microchip.com/downloads/en/DeviceDoc/KSZ87xx-Errata-DS80000687C.pdf
Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
---
drivers/net/dsa/microchip/ksz8.h | 1 +
drivers/net/dsa/microchip/ksz8795.c | 45 ++++++++++++++++++++++++-
drivers/net/dsa/microchip/ksz8795_reg.h | 4 +++
drivers/net/dsa/microchip/ksz_common.h | 1 +
4 files changed, 50 insertions(+), 1 deletion(-)
diff --git a/drivers/net/dsa/microchip/ksz8.h b/drivers/net/dsa/microchip/ksz8.h
index 9d611895d3cf..03da369675c6 100644
--- a/drivers/net/dsa/microchip/ksz8.h
+++ b/drivers/net/dsa/microchip/ksz8.h
@@ -16,6 +16,7 @@ enum ksz_regs {
REG_IND_DATA_HI,
REG_IND_DATA_LO,
REG_IND_MIB_CHECK,
+ REG_IND_BYTE,
P_FORCE_CTRL,
P_LINK_STATUS,
P_LOCAL_CTRL,
diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
index 5dc9899bc0a6..6f9cdd5204fb 100644
--- a/drivers/net/dsa/microchip/ksz8795.c
+++ b/drivers/net/dsa/microchip/ksz8795.c
@@ -33,6 +33,7 @@ static const u8 ksz8795_regs[] = {
[REG_IND_DATA_HI] = 0x71,
[REG_IND_DATA_LO] = 0x75,
[REG_IND_MIB_CHECK] = 0x74,
+ [REG_IND_BYTE] = 0xA0,
[P_FORCE_CTRL] = 0x0C,
[P_LINK_STATUS] = 0x0E,
[P_LOCAL_CTRL] = 0x07,
@@ -222,6 +223,25 @@ static void ksz_port_cfg(struct ksz_device *dev, int port, int offset, u8 bits,
bits, set ? bits : 0);
}
+static int ksz8_ind_write8(struct ksz_device *dev, u8 table, u16 addr, u8 data)
+{
+ struct ksz8 *ksz8 = dev->priv;
+ const u8 *regs = ksz8->regs;
+ u16 ctrl_addr;
+ int ret = 0;
+
+ mutex_lock(&dev->alu_mutex);
+
+ ctrl_addr = IND_ACC_TABLE(table) | addr;
+ ret = ksz_write8(dev, regs[REG_IND_BYTE], data);
+ if (!ret)
+ ret = ksz_write16(dev, regs[REG_IND_CTRL_0], ctrl_addr);
+
+ mutex_unlock(&dev->alu_mutex);
+
+ return ret;
+}
+
static int ksz8_reset_switch(struct ksz_device *dev)
{
if (ksz_is_ksz88x3(dev)) {
@@ -1391,6 +1411,23 @@ static void ksz8_config_cpu_port(struct dsa_switch *ds)
}
}
+static int ksz8_handle_global_errata(struct dsa_switch *ds)
+{
+ struct ksz_device *dev = ds->priv;
+ int ret = 0;
+
+ /* KSZ87xx Errata DS80000687C.
+ * Module 2: Link drops with some EEE link partners.
+ * An issue with the EEE next page exchange between the
+ * KSZ879x/KSZ877x/KSZ876x and some EEE link partners may result in
+ * the link dropping.
+ */
+ if (dev->ksz87xx_eee_link_erratum)
+ ret = ksz8_ind_write8(dev, TABLE_EEE, REG_IND_EEE_GLOB2_HI, 0);
+
+ return ret;
+}
+
static int ksz8_setup(struct dsa_switch *ds)
{
struct ksz_device *dev = ds->priv;
@@ -1458,7 +1495,7 @@ static int ksz8_setup(struct dsa_switch *ds)
ds->configure_vlan_while_not_filtering = false;
- return 0;
+ return ksz8_handle_global_errata(ds);
}
static void ksz8_get_caps(struct dsa_switch *ds, int port,
@@ -1575,6 +1612,7 @@ struct ksz_chip_data {
int num_statics;
int cpu_ports;
int port_cnt;
+ bool ksz87xx_eee_link_erratum;
};
static const struct ksz_chip_data ksz8_switch_chips[] = {
@@ -1586,6 +1624,7 @@ static const struct ksz_chip_data ksz8_switch_chips[] = {
.num_statics = 8,
.cpu_ports = 0x10, /* can be configured as cpu port */
.port_cnt = 5, /* total cpu and user ports */
+ .ksz87xx_eee_link_erratum = true,
},
{
/*
@@ -1609,6 +1648,7 @@ static const struct ksz_chip_data ksz8_switch_chips[] = {
.num_statics = 8,
.cpu_ports = 0x10, /* can be configured as cpu port */
.port_cnt = 4, /* total cpu and user ports */
+ .ksz87xx_eee_link_erratum = true,
},
{
.chip_id = 0x8765,
@@ -1618,6 +1658,7 @@ static const struct ksz_chip_data ksz8_switch_chips[] = {
.num_statics = 8,
.cpu_ports = 0x10, /* can be configured as cpu port */
.port_cnt = 5, /* total cpu and user ports */
+ .ksz87xx_eee_link_erratum = true,
},
{
.chip_id = 0x8830,
@@ -1652,6 +1693,8 @@ static int ksz8_switch_init(struct ksz_device *dev)
dev->host_mask = chip->cpu_ports;
dev->port_mask = (BIT(dev->phy_port_cnt) - 1) |
chip->cpu_ports;
+ dev->ksz87xx_eee_link_erratum =
+ chip->ksz87xx_eee_link_erratum;
break;
}
}
diff --git a/drivers/net/dsa/microchip/ksz8795_reg.h b/drivers/net/dsa/microchip/ksz8795_reg.h
index 6b40bc25f7ff..d74defcd86b4 100644
--- a/drivers/net/dsa/microchip/ksz8795_reg.h
+++ b/drivers/net/dsa/microchip/ksz8795_reg.h
@@ -812,6 +812,10 @@
#define IND_ACC_TABLE(table) ((table) << 8)
+/* */
+#define REG_IND_EEE_GLOB2_LO 0x34
+#define REG_IND_EEE_GLOB2_HI 0x35
+
/* Driver set switch broadcast storm protection at 10% rate. */
#define BROADCAST_STORM_PROT_RATE 10
diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h
index fa39ee73cbd2..485d4a948c38 100644
--- a/drivers/net/dsa/microchip/ksz_common.h
+++ b/drivers/net/dsa/microchip/ksz_common.h
@@ -77,6 +77,7 @@ struct ksz_device {
phy_interface_t compat_interface;
u32 regs_size;
bool phy_errata_9477;
+ bool ksz87xx_eee_link_erratum;
bool synclko_125;
bool synclko_disable;
--
2.30.2
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