diff options
author | Florian Fainelli <f.fainelli@gmail.com> | 2017-10-11 17:53:12 -0700 |
---|---|---|
committer | Kishon Vijay Abraham I <kishon@ti.com> | 2017-10-23 11:19:26 +0530 |
commit | af174c49564a6fcdb2d10516307e6b28d213b807 (patch) | |
tree | 001a9ff1448b33b42bdc1f6a7b48e6494f4d66e2 | |
parent | 6ec248fed585d88873c79088cba45918f7724eff (diff) | |
download | linux-stable-af174c49564a6fcdb2d10516307e6b28d213b807.tar.gz linux-stable-af174c49564a6fcdb2d10516307e6b28d213b807.tar.bz2 linux-stable-af174c49564a6fcdb2d10516307e6b28d213b807.zip |
phy: brcm-sata: Allow RX equalizer tuning
Parse the DT properties brcm,rxaeq-mode and brcm,rxaeq-value to
correctly configure the RX equalizer of the PHY. This may be required to
resolve specific signal integrity issues.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
-rw-r--r-- | drivers/phy/broadcom/phy-brcm-sata.c | 69 |
1 files changed, 68 insertions, 1 deletions
diff --git a/drivers/phy/broadcom/phy-brcm-sata.c b/drivers/phy/broadcom/phy-brcm-sata.c index 0152d0b32dae..3f953db70288 100644 --- a/drivers/phy/broadcom/phy-brcm-sata.c +++ b/drivers/phy/broadcom/phy-brcm-sata.c @@ -49,11 +49,29 @@ enum brcm_sata_phy_version { BRCM_SATA_PHY_IPROC_SR, }; +enum brcm_sata_phy_rxaeq_mode { + RXAEQ_MODE_OFF = 0, + RXAEQ_MODE_AUTO, + RXAEQ_MODE_MANUAL, +}; + +static enum brcm_sata_phy_rxaeq_mode rxaeq_to_val(const char *m) +{ + if (!strcmp(m, "auto")) + return RXAEQ_MODE_AUTO; + else if (!strcmp(m, "manual")) + return RXAEQ_MODE_MANUAL; + else + return RXAEQ_MODE_OFF; +} + struct brcm_sata_port { int portnum; struct phy *phy; struct brcm_sata_phy *phy_priv; bool ssc_en; + enum brcm_sata_phy_rxaeq_mode rxaeq_mode; + u32 rxaeq_val; }; struct brcm_sata_phy { @@ -93,6 +111,15 @@ enum sata_phy_regs { TX_ACTRL0 = 0x80, TX_ACTRL0_TXPOL_FLIP = BIT(6), + AEQRX_REG_BANK_0 = 0xd0, + AEQ_CONTROL1 = 0x81, + AEQ_CONTROL1_ENABLE = BIT(2), + AEQ_CONTROL1_FREEZE = BIT(3), + AEQ_FRC_EQ = 0x83, + AEQ_FRC_EQ_FORCE = BIT(0), + AEQ_FRC_EQ_FORCE_VAL = BIT(1), + AEQRX_REG_BANK_1 = 0xe0, + OOB_REG_BANK = 0x150, OOB1_REG_BANK = 0x160, OOB_CTRL1 = 0x80, @@ -217,11 +244,43 @@ static void brcm_stb_sata_ssc_init(struct brcm_sata_port *port) ~TXPMD_TX_FREQ_CTRL_CONTROL3_FMAX_MASK, tmp); } +#define AEQ_FRC_EQ_VAL_SHIFT 2 +#define AEQ_FRC_EQ_VAL_MASK 0x3f + +static int brcm_stb_sata_rxaeq_init(struct brcm_sata_port *port) +{ + void __iomem *base = brcm_sata_pcb_base(port); + u32 tmp = 0, reg = 0; + + switch (port->rxaeq_mode) { + case RXAEQ_MODE_OFF: + return 0; + + case RXAEQ_MODE_AUTO: + reg = AEQ_CONTROL1; + tmp = AEQ_CONTROL1_ENABLE | AEQ_CONTROL1_FREEZE; + break; + + case RXAEQ_MODE_MANUAL: + reg = AEQ_FRC_EQ; + tmp = AEQ_FRC_EQ_FORCE | AEQ_FRC_EQ_FORCE_VAL; + if (port->rxaeq_val > AEQ_FRC_EQ_VAL_MASK) + return -EINVAL; + tmp |= port->rxaeq_val << AEQ_FRC_EQ_VAL_SHIFT; + break; + } + + brcm_sata_phy_wr(base, AEQRX_REG_BANK_0, reg, ~tmp, tmp); + brcm_sata_phy_wr(base, AEQRX_REG_BANK_1, reg, ~tmp, tmp); + + return 0; +} + static int brcm_stb_sata_init(struct brcm_sata_port *port) { brcm_stb_sata_ssc_init(port); - return 0; + return brcm_stb_sata_rxaeq_init(port); } /* NS2 SATA PLL1 defaults were characterized by H/W group */ @@ -468,6 +527,7 @@ MODULE_DEVICE_TABLE(of, brcm_sata_phy_of_match); static int brcm_sata_phy_probe(struct platform_device *pdev) { + const char *rxaeq_mode; struct device *dev = &pdev->dev; struct device_node *dn = dev->of_node, *child; const struct of_device_id *of_id; @@ -530,6 +590,13 @@ static int brcm_sata_phy_probe(struct platform_device *pdev) port->portnum = id; port->phy_priv = priv; port->phy = devm_phy_create(dev, child, &phy_ops); + port->rxaeq_mode = RXAEQ_MODE_OFF; + if (!of_property_read_string(child, "brcm,rxaeq-mode", + &rxaeq_mode)) + port->rxaeq_mode = rxaeq_to_val(rxaeq_mode); + if (port->rxaeq_mode == RXAEQ_MODE_MANUAL) + of_property_read_u32(child, "brcm,rxaeq-value", + &port->rxaeq_val); port->ssc_en = of_property_read_bool(child, "brcm,enable-ssc"); if (IS_ERR(port->phy)) { dev_err(dev, "failed to create PHY\n"); |