diff options
| author | Mario Scheithauer <mario.scheithauer@siemens.com> | 2022-11-21 16:22:03 +0100 |
|---|---|---|
| committer | Martin L Roth <gaumless@gmail.com> | 2022-11-24 06:03:38 +0000 |
| commit | 16dd1c31c22d56e53d4e37c66c52e1177f6c38f2 (patch) | |
| tree | e23801926a46e28e2b198f30dd6af93025c3f1ff /src/drivers | |
| parent | e19f40377078375ed85f27e5028ed17d7857d6ca (diff) | |
drivers/net/phy/m88e1512: Add downshift enable
This patch provides the functionality to enable downshift on Marvell
PHY. By setting a downshift counter, the PHY is correspondingly often
attempted to establish Gigabit link before the PHY downshifts to the
next highest speed. The range is limited to 8 trials. To activate
downshift, a software reset must follow to take effect.
Change-Id: I4224eab6c1fc13824d53556c80435bc130a13bdb
Signed-off-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69853
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/drivers')
| -rw-r--r-- | src/drivers/net/phy/m88e1512/chip.h | 3 | ||||
| -rw-r--r-- | src/drivers/net/phy/m88e1512/m88e1512.c | 22 | ||||
| -rw-r--r-- | src/drivers/net/phy/m88e1512/m88e1512.h | 9 |
3 files changed, 34 insertions, 0 deletions
diff --git a/src/drivers/net/phy/m88e1512/chip.h b/src/drivers/net/phy/m88e1512/chip.h index 9a3523d7ee..915001a7a1 100644 --- a/src/drivers/net/phy/m88e1512/chip.h +++ b/src/drivers/net/phy/m88e1512/chip.h @@ -8,4 +8,7 @@ struct drivers_net_phy_m88e1512_config { unsigned char led_1_ctrl; /* LED[1] Control */ unsigned char led_2_ctrl; /* LED[2] Control */ bool enable_int; /* INTn can be routed to LED[2] pin */ + /* 1x, 2x,...8x is the number of times the PHY attempts to establish Gigabit link + before the PHY downshifts to the next highest speed. */ + unsigned char downshift_cnt; }; diff --git a/src/drivers/net/phy/m88e1512/m88e1512.c b/src/drivers/net/phy/m88e1512/m88e1512.c index a8d1c730a1..f32991fcd5 100644 --- a/src/drivers/net/phy/m88e1512/m88e1512.c +++ b/src/drivers/net/phy/m88e1512/m88e1512.c @@ -17,6 +17,28 @@ static void m88e1512_init(struct device *dev) struct drivers_net_phy_m88e1512_config *config = dev->chip_info; uint16_t reg; + /* Enable downshift. */ + if (config->downshift_cnt) { + if (config->downshift_cnt > DOWNSHIFT_CNT_MAX) { + printk(BIOS_INFO, "%s: Downshift counter for %s is too large.\n", + dev_path(dev->bus->dev), dev->chip_ops->name); + } else { + printk(BIOS_DEBUG, "%s: Enable downshift after %d attempts for %s.\n", + dev_path(dev->bus->dev), config->downshift_cnt, + dev->chip_ops->name); + + reg = mdio_read(dev, COPPER_SPEC_CTRL_REG_1); + clrsetbits16(®, DOWNSHIFT_CNT_MASK, + DOWNSHIFT_CNT(config->downshift_cnt) | DOWNSHIFT_EN); + mdio_write(dev, COPPER_SPEC_CTRL_REG_1, reg); + + /* Downshift enable requires a software reset to take effect. */ + reg = mdio_read(dev, COPPER_CTRL_REG); + setbits16(®, SOFTWARE_RESET); + mdio_write(dev, COPPER_CTRL_REG, reg); + } + } + /* Configure LEDs if requested. */ if (config->configure_leds) { printk(BIOS_DEBUG, "%s: Set a customized LED mode for %s.\n", diff --git a/src/drivers/net/phy/m88e1512/m88e1512.h b/src/drivers/net/phy/m88e1512/m88e1512.h index ca0f756693..449cc57531 100644 --- a/src/drivers/net/phy/m88e1512/m88e1512.h +++ b/src/drivers/net/phy/m88e1512/m88e1512.h @@ -5,6 +5,15 @@ /* Register layout */ #define PAGE_REG 0x16 +/* Page 0 registers */ +#define COPPER_CTRL_REG 0 +#define SOFTWARE_RESET (1 << 15) +#define COPPER_SPEC_CTRL_REG_1 0x10 +#define DOWNSHIFT_CNT_MASK 0x7000 +#define DOWNSHIFT_CNT_MAX 8 +#define DOWNSHIFT_CNT(cnt) ((cnt - 1) << 12) +#define DOWNSHIFT_EN (1 << 11) +/* Page 3 registers */ #define LED_FUNC_CTRL_REG 0x10 #define LED_FUNC_CTRL_MASK 0x0FFF #define LED_TIMER_CTRL_REG 0x12 |