From 3e507769d15e4b14b5a3688d7f5cba516cb4e72d Mon Sep 17 00:00:00 2001 From: Florian Fainelli Date: Thu, 11 Jan 2018 17:31:07 -0800 Subject: [PATCH] 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 Acked-by: Kishon Vijay Abraham I Signed-off-by: Tejun Heo --- drivers/phy/broadcom/phy-brcm-sata.c | 32 ++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/drivers/phy/broadcom/phy-brcm-sata.c b/drivers/phy/broadcom/phy-brcm-sata.c index 3f953db70288..8000ce312d95 100644 --- a/drivers/phy/broadcom/phy-brcm-sata.c +++ b/drivers/phy/broadcom/phy-brcm-sata.c @@ -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, };