net: dsa: mv88e6xxx: Avoid EEPROM timeout when EEPROM is absent

[ Upstream commit 6ccf50d4d4741e064ba35511a95402c63bbe21a8 ]

Since commit 23d775f12dcd ("net: dsa: mv88e6xxx: Wait for EEPROM done
before HW reset") the following error is seen on a imx8mn board with
a 88E6320 switch:

mv88e6085 30be0000.ethernet-1:00: Timeout waiting for EEPROM done

This board does not have an EEPROM attached to the switch though.

This problem is well explained by Andrew Lunn:

"If there is an EEPROM, and the EEPROM contains a lot of data, it could
be that when we perform a hardware reset towards the end of probe, it
interrupts an I2C bus transaction, leaving the I2C bus in a bad state,
and future reads of the EEPROM do not work.

The work around for this was to poll the EEInt status and wait for it
to go true before performing the hardware reset.

However, we have discovered that for some boards which do not have an
EEPROM, EEInt never indicates complete. As a result,
mv88e6xxx_g1_wait_eeprom_done() spins for a second and then prints a
warning.

We probably need a different solution than calling
mv88e6xxx_g1_wait_eeprom_done(). The datasheet for 6352 documents the
EEPROM Command register:

bit 15 is:

  EEPROM Unit Busy. This bit must be set to a one to start an EEPROM
  operation (see EEOp below). Only one EEPROM operation can be
  executing at one time so this bit must be zero before setting it to
  a one.  When the requested EEPROM operation completes this bit will
  automatically be cleared to a zero. The transition of this bit from
  a one to a zero can be used to generate an interrupt (the EEInt in
  Global 1, offset 0x00).

and more interesting is bit 11:

  Register Loader Running. This bit is set to one whenever the
  register loader is busy executing instructions contained in the
  EEPROM."

Change to using mv88e6xxx_g2_eeprom_wait() to fix the timeout error
when the EEPROM chip is not present.

Fixes: 23d775f12dcd ("net: dsa: mv88e6xxx: Wait for EEPROM done before HW reset")
Suggested-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 7af2f08a62f14b7ac38e56e9ca656a3830b4a839..0d4b236d1e344983846fd9e7778b35a2a0d9839a 100644 (file)
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -3040,14 +3040,16 @@ static void mv88e6xxx_hardware_reset(struct mv88e6xxx_chip *chip)
                 * from the wrong location resulting in the switch booting
                 * to wrong mode and inoperable.
                 */
-               mv88e6xxx_g1_wait_eeprom_done(chip);
+               if (chip->info->ops->get_eeprom)
+                       mv88e6xxx_g2_eeprom_wait(chip);
 
                gpiod_set_value_cansleep(gpiod, 1);
                usleep_range(10000, 20000);
                gpiod_set_value_cansleep(gpiod, 0);
                usleep_range(10000, 20000);
 
-               mv88e6xxx_g1_wait_eeprom_done(chip);
+               if (chip->info->ops->get_eeprom)
+                       mv88e6xxx_g2_eeprom_wait(chip);
        }
 }
 

diff --git a/drivers/net/dsa/mv88e6xxx/global1.c b/drivers/net/dsa/mv88e6xxx/global1.c
index 2fa55a6435910fd5d9a9c42dd28b93285b2181ba..174c773b38c2bd252c3107174886a497b3fab71e 100644 (file)
--- a/drivers/net/dsa/mv88e6xxx/global1.c
+++ b/drivers/net/dsa/mv88e6xxx/global1.c
@@ -75,37 +75,6 @@ static int mv88e6xxx_g1_wait_init_ready(struct mv88e6xxx_chip *chip)
        return mv88e6xxx_g1_wait_bit(chip, MV88E6XXX_G1_STS, bit, 1);
 }
 
-void mv88e6xxx_g1_wait_eeprom_done(struct mv88e6xxx_chip *chip)
-{
-       const unsigned long timeout = jiffies + 1 * HZ;
-       u16 val;
-       int err;
-
-       /* Wait up to 1 second for the switch to finish reading the
-        * EEPROM.
-        */
-       while (time_before(jiffies, timeout)) {
-               err = mv88e6xxx_g1_read(chip, MV88E6XXX_G1_STS, &val);
-               if (err) {
-                       dev_err(chip->dev, "Error reading status");
-                       return;
-               }
-
-               /* If the switch is still resetting, it may not
-                * respond on the bus, and so MDIO read returns
-                * 0xffff. Differentiate between that, and waiting for
-                * the EEPROM to be done by bit 0 being set.
-                */
-               if (val != 0xffff &&
-                   val & BIT(MV88E6XXX_G1_STS_IRQ_EEPROM_DONE))
-                       return;
-
-               usleep_range(1000, 2000);
-       }
-
-       dev_err(chip->dev, "Timeout waiting for EEPROM done");
-}
-
 /* Offset 0x01: Switch MAC Address Register Bytes 0 & 1
  * Offset 0x02: Switch MAC Address Register Bytes 2 & 3
  * Offset 0x03: Switch MAC Address Register Bytes 4 & 5

diff --git a/drivers/net/dsa/mv88e6xxx/global1.h b/drivers/net/dsa/mv88e6xxx/global1.h
index c99ddd117fe6e13fa00ea29e8fe91534608794d5..1095261f5b490a8bc708f3d7a513ca633ae0080c 100644 (file)
--- a/drivers/net/dsa/mv88e6xxx/global1.h
+++ b/drivers/net/dsa/mv88e6xxx/global1.h
@@ -282,7 +282,6 @@ int mv88e6xxx_g1_set_switch_mac(struct mv88e6xxx_chip *chip, u8 *addr);
 int mv88e6185_g1_reset(struct mv88e6xxx_chip *chip);
 int mv88e6352_g1_reset(struct mv88e6xxx_chip *chip);
 int mv88e6250_g1_reset(struct mv88e6xxx_chip *chip);
-void mv88e6xxx_g1_wait_eeprom_done(struct mv88e6xxx_chip *chip);
 
 int mv88e6185_g1_ppu_enable(struct mv88e6xxx_chip *chip);
 int mv88e6185_g1_ppu_disable(struct mv88e6xxx_chip *chip);

diff --git a/drivers/net/dsa/mv88e6xxx/global2.c b/drivers/net/dsa/mv88e6xxx/global2.c
index 937a01f2ba75ebe0e89e419da93a0b937352cb68..b2b5f6ba438f46f2e8b39625a08e5eaae2d63d03 100644 (file)
--- a/drivers/net/dsa/mv88e6xxx/global2.c
+++ b/drivers/net/dsa/mv88e6xxx/global2.c
@@ -340,7 +340,7 @@ int mv88e6xxx_g2_pot_clear(struct mv88e6xxx_chip *chip)
  * Offset 0x15: EEPROM Addr (for 8-bit data access)
  */
 
-static int mv88e6xxx_g2_eeprom_wait(struct mv88e6xxx_chip *chip)
+int mv88e6xxx_g2_eeprom_wait(struct mv88e6xxx_chip *chip)
 {
        int bit = __bf_shf(MV88E6XXX_G2_EEPROM_CMD_BUSY);
        int err;

diff --git a/drivers/net/dsa/mv88e6xxx/global2.h b/drivers/net/dsa/mv88e6xxx/global2.h
index 7e091965582b75254b3dd6b0fed781a77f637d75..d9434f7cae538bb887271f144f0414ae8027becc 100644 (file)
--- a/drivers/net/dsa/mv88e6xxx/global2.h
+++ b/drivers/net/dsa/mv88e6xxx/global2.h
@@ -365,6 +365,7 @@ int mv88e6xxx_g2_trunk_clear(struct mv88e6xxx_chip *chip);
 
 int mv88e6xxx_g2_device_mapping_write(struct mv88e6xxx_chip *chip, int target,
                                      int port);
+int mv88e6xxx_g2_eeprom_wait(struct mv88e6xxx_chip *chip);
 
 extern const struct mv88e6xxx_irq_ops mv88e6097_watchdog_ops;
 extern const struct mv88e6xxx_irq_ops mv88e6250_watchdog_ops;