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phy: brcm-sata: Implement calibrate callback 

Implement the calibration callback to allow turning on the Clock-Data
Recovery module clamping when necessary, e.g: during failure to identify
a SATA hard drive from ahci_brcm.c::brcm_ahci_read_id.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Florian Fainelli 2018-01-11 17:31:07 -08:00 committed by Tejun Heo
parent f919dde077
commit 3e507769d1
1 changed files with 32 additions and 0 deletions
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32
drivers/phy/broadcom/phy-brcm-sata.c
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@ -150,6 +150,9 @@ enum sata_phy_regs {
TXPMD_TX_FREQ_CTRL_CONTROL2_FMIN_MASK = 0x3ff,
TXPMD_TX_FREQ_CTRL_CONTROL3 = 0x84,
TXPMD_TX_FREQ_CTRL_CONTROL3_FMAX_MASK = 0x3ff,
RXPMD_REG_BANK = 0x1c0,
RXPMD_RX_FREQ_MON_CONTROL1 = 0x87,
};
enum sata_phy_ctrl_regs {
@ -505,8 +508,37 @@ static int brcm_sata_phy_init(struct phy *phy)
return rc;
}
static void brcm_stb_sata_calibrate(struct brcm_sata_port *port)
{
void __iomem *base = brcm_sata_pcb_base(port);
struct brcm_sata_phy *priv = port->phy_priv;
u32 tmp = BIT(8);
brcm_sata_phy_wr(base, RXPMD_REG_BANK, RXPMD_RX_FREQ_MON_CONTROL1,
~tmp, tmp);
}
static int brcm_sata_phy_calibrate(struct phy *phy)
{
struct brcm_sata_port *port = phy_get_drvdata(phy);
int rc = -EOPNOTSUPP;
switch (port->phy_priv->version) {
case BRCM_SATA_PHY_STB_28NM:
case BRCM_SATA_PHY_STB_40NM:
brcm_stb_sata_calibrate(port);
rc = 0;
break;
default:
break;
};
return rc;
}
static const struct phy_ops phy_ops = {
.init = brcm_sata_phy_init,
.calibrate = brcm_sata_phy_calibrate,
.owner = THIS_MODULE,
};