From 277d5d1f9bca275546afa399fb7fd9e29ee04aca Mon Sep 17 00:00:00 2001 From: Roger Quadros Date: Wed, 6 Nov 2019 16:21:17 +0200 Subject: [PATCH] phy: ti-pipe3: improve DPLL stability for SATA & USB For increased DPLL stability use the settings recommended in the TRM [1] for PHY_RX registers for SATA and USB. For SATA we need to use spread spectrum settings even though we don't have spread spectrum enabled. The suggested non-spread spectrum settings don't work. [1] DRA75x, DRA74x TRM - http://www.ti.com/lit/ug/sprui30f/sprui30f.pdf Signed-off-by: Roger Quadros --- drivers/phy/ti-pipe3-phy.c | 193 +++++++++++++++++++++++++++++++++++++ 1 file changed, 193 insertions(+) diff --git a/drivers/phy/ti-pipe3-phy.c b/drivers/phy/ti-pipe3-phy.c index 935dc7afb6..b9c8591470 100644 --- a/drivers/phy/ti-pipe3-phy.c +++ b/drivers/phy/ti-pipe3-phy.c @@ -50,6 +50,62 @@ #define OMAP_CTRL_PIPE3_PHY_TX_RX_POWERON 0x3 #define OMAP_CTRL_PIPE3_PHY_TX_RX_POWEROFF 0x0 +/* PHY RX Registers */ +#define PIPE3_PHY_RX_ANA_PROGRAMMABILITY 0x0000000C +#define INTERFACE_MASK GENMASK(31, 27) +#define INTERFACE_SHIFT 27 +#define INTERFACE_MODE_USBSS BIT(4) +#define INTERFACE_MODE_SATA_1P5 BIT(3) +#define INTERFACE_MODE_SATA_3P0 BIT(2) +#define INTERFACE_MODE_PCIE BIT(0) + +#define LOSD_MASK GENMASK(17, 14) +#define LOSD_SHIFT 14 +#define MEM_PLLDIV GENMASK(6, 5) + +#define PIPE3_PHY_RX_TRIM 0x0000001C +#define MEM_DLL_TRIM_SEL_MASK GENMASK(31, 30) +#define MEM_DLL_TRIM_SHIFT 30 + +#define PIPE3_PHY_RX_DLL 0x00000024 +#define MEM_DLL_PHINT_RATE_MASK GENMASK(31, 30) +#define MEM_DLL_PHINT_RATE_SHIFT 30 + +#define PIPE3_PHY_RX_DIGITAL_MODES 0x00000028 +#define MEM_HS_RATE_MASK GENMASK(28, 27) +#define MEM_HS_RATE_SHIFT 27 +#define MEM_OVRD_HS_RATE BIT(26) +#define MEM_OVRD_HS_RATE_SHIFT 26 +#define MEM_CDR_FASTLOCK BIT(23) +#define MEM_CDR_FASTLOCK_SHIFT 23 +#define MEM_CDR_LBW_MASK GENMASK(22, 21) +#define MEM_CDR_LBW_SHIFT 21 +#define MEM_CDR_STEPCNT_MASK GENMASK(20, 19) +#define MEM_CDR_STEPCNT_SHIFT 19 +#define MEM_CDR_STL_MASK GENMASK(18, 16) +#define MEM_CDR_STL_SHIFT 16 +#define MEM_CDR_THR_MASK GENMASK(15, 13) +#define MEM_CDR_THR_SHIFT 13 +#define MEM_CDR_THR_MODE BIT(12) +#define MEM_CDR_THR_MODE_SHIFT 12 +#define MEM_CDR_2NDO_SDM_MODE BIT(11) +#define MEM_CDR_2NDO_SDM_MODE_SHIFT 11 + +#define PIPE3_PHY_RX_EQUALIZER 0x00000038 +#define MEM_EQLEV_MASK GENMASK(31, 16) +#define MEM_EQLEV_SHIFT 16 +#define MEM_EQFTC_MASK GENMASK(15, 11) +#define MEM_EQFTC_SHIFT 11 +#define MEM_EQCTL_MASK GENMASK(10, 7) +#define MEM_EQCTL_SHIFT 7 +#define MEM_OVRD_EQLEV BIT(2) +#define MEM_OVRD_EQLEV_SHIFT 2 +#define MEM_OVRD_EQFTC BIT(1) +#define MEM_OVRD_EQFTC_SHIFT 1 + +#define SATA_PHY_RX_IO_AND_A2D_OVERRIDES 0x44 +#define MEM_CDR_LOS_SOURCE_MASK GENMASK(10, 9) +#define MEM_CDR_LOS_SOURCE_SHIFT 9 #define PLL_IDLE_TIME 100 /* in milliseconds */ #define PLL_LOCK_TIME 100 /* in milliseconds */ @@ -58,12 +114,35 @@ enum pipe3_mode { PIPE3_MODE_PCIE = 1, PIPE3_MODE_SATA, PIPE3_MODE_USBSS }; +struct pipe3_settings { + u8 ana_interface; + u8 ana_losd; + u8 dig_fastlock; + u8 dig_lbw; + u8 dig_stepcnt; + u8 dig_stl; + u8 dig_thr; + u8 dig_thr_mode; + u8 dig_2ndo_sdm_mode; + u8 dig_hs_rate; + u8 dig_ovrd_hs_rate; + u8 dll_trim_sel; + u8 dll_phint_rate; + u8 eq_lev; + u8 eq_ftc; + u8 eq_ctl; + u8 eq_ovrd_lev; + u8 eq_ovrd_ftc; +}; + struct omap_pipe3 { void __iomem *pll_ctrl_base; + void __iomem *phy_rx; void __iomem *power_reg; void __iomem *pll_reset_reg; struct pipe3_dpll_map *dpll_map; enum pipe3_mode mode; + struct pipe3_settings settings; }; struct pipe3_dpll_params { @@ -82,6 +161,7 @@ struct pipe3_dpll_map { struct pipe3_data { enum pipe3_mode mode; struct pipe3_dpll_map *dpll_map; + struct pipe3_settings settings; }; static inline u32 omap_pipe3_readl(void __iomem *addr, unsigned offset) @@ -199,6 +279,60 @@ static void omap_control_pipe3_power(struct omap_pipe3 *pipe3, int on) writel(val, pipe3->power_reg); } +static void ti_pipe3_calibrate(struct omap_pipe3 *phy) +{ + u32 val; + struct pipe3_settings *s = &phy->settings; + + val = omap_pipe3_readl(phy->phy_rx, PIPE3_PHY_RX_ANA_PROGRAMMABILITY); + val &= ~(INTERFACE_MASK | LOSD_MASK | MEM_PLLDIV); + val = (s->ana_interface << INTERFACE_SHIFT | s->ana_losd << LOSD_SHIFT); + omap_pipe3_writel(phy->phy_rx, PIPE3_PHY_RX_ANA_PROGRAMMABILITY, val); + + val = omap_pipe3_readl(phy->phy_rx, PIPE3_PHY_RX_DIGITAL_MODES); + val &= ~(MEM_HS_RATE_MASK | MEM_OVRD_HS_RATE | MEM_CDR_FASTLOCK | + MEM_CDR_LBW_MASK | MEM_CDR_STEPCNT_MASK | MEM_CDR_STL_MASK | + MEM_CDR_THR_MASK | MEM_CDR_THR_MODE | MEM_CDR_2NDO_SDM_MODE); + val |= s->dig_hs_rate << MEM_HS_RATE_SHIFT | + s->dig_ovrd_hs_rate << MEM_OVRD_HS_RATE_SHIFT | + s->dig_fastlock << MEM_CDR_FASTLOCK_SHIFT | + s->dig_lbw << MEM_CDR_LBW_SHIFT | + s->dig_stepcnt << MEM_CDR_STEPCNT_SHIFT | + s->dig_stl << MEM_CDR_STL_SHIFT | + s->dig_thr << MEM_CDR_THR_SHIFT | + s->dig_thr_mode << MEM_CDR_THR_MODE_SHIFT | + s->dig_2ndo_sdm_mode << MEM_CDR_2NDO_SDM_MODE_SHIFT; + omap_pipe3_writel(phy->phy_rx, PIPE3_PHY_RX_DIGITAL_MODES, val); + + val = omap_pipe3_readl(phy->phy_rx, PIPE3_PHY_RX_TRIM); + val &= ~MEM_DLL_TRIM_SEL_MASK; + val |= s->dll_trim_sel << MEM_DLL_TRIM_SHIFT; + omap_pipe3_writel(phy->phy_rx, PIPE3_PHY_RX_TRIM, val); + + val = omap_pipe3_readl(phy->phy_rx, PIPE3_PHY_RX_DLL); + val &= ~MEM_DLL_PHINT_RATE_MASK; + val |= s->dll_phint_rate << MEM_DLL_PHINT_RATE_SHIFT; + omap_pipe3_writel(phy->phy_rx, PIPE3_PHY_RX_DLL, val); + + val = omap_pipe3_readl(phy->phy_rx, PIPE3_PHY_RX_EQUALIZER); + val &= ~(MEM_EQLEV_MASK | MEM_EQFTC_MASK | MEM_EQCTL_MASK | + MEM_OVRD_EQLEV | MEM_OVRD_EQFTC); + val |= s->eq_lev << MEM_EQLEV_SHIFT | + s->eq_ftc << MEM_EQFTC_SHIFT | + s->eq_ctl << MEM_EQCTL_SHIFT | + s->eq_ovrd_lev << MEM_OVRD_EQLEV_SHIFT | + s->eq_ovrd_ftc << MEM_OVRD_EQFTC_SHIFT; + omap_pipe3_writel(phy->phy_rx, PIPE3_PHY_RX_EQUALIZER, val); + + if (phy->mode == PIPE3_MODE_SATA) { + val = omap_pipe3_readl(phy->phy_rx, + SATA_PHY_RX_IO_AND_A2D_OVERRIDES); + val &= ~MEM_CDR_LOS_SOURCE_MASK; + omap_pipe3_writel(phy->phy_rx, SATA_PHY_RX_IO_AND_A2D_OVERRIDES, + val); + } +} + static int pipe3_init(struct phy *phy) { int ret; @@ -211,6 +345,8 @@ static int pipe3_init(struct phy *phy) ret = omap_pipe3_dpll_program(pipe3); if (ret) return ret; + + ti_pipe3_calibrate(pipe3); } else { /* else just bring it out of IDLE mode */ val = omap_pipe3_readl(pipe3->pll_ctrl_base, @@ -328,6 +464,20 @@ static int pipe3_phy_probe(struct udevice *dev) struct omap_pipe3 *pipe3 = dev_get_priv(dev); struct pipe3_data *data; + /* PHY_RX */ + addr = devfdt_get_addr_size_index(dev, 0, &sz); + if (addr == FDT_ADDR_T_NONE) { + pr_err("missing phy_rx address\n"); + return -EINVAL; + } + + pipe3->phy_rx = map_physmem(addr, sz, MAP_NOCACHE); + if (!pipe3->phy_rx) { + pr_err("unable to remap phy_rx\n"); + return -EINVAL; + } + + /* PLLCTRL */ addr = devfdt_get_addr_size_index(dev, 2, &sz); if (addr == FDT_ADDR_T_NONE) { pr_err("missing pll ctrl address\n"); @@ -347,6 +497,7 @@ static int pipe3_phy_probe(struct udevice *dev) data = (struct pipe3_data *)dev_get_driver_data(dev); pipe3->mode = data->mode; pipe3->dpll_map = data->dpll_map; + pipe3->settings = data->settings; if (pipe3->mode == PIPE3_MODE_SATA) { pipe3->pll_reset_reg = get_reg(dev, "syscon-pllreset"); @@ -380,11 +531,53 @@ static struct pipe3_dpll_map dpll_map_usb[] = { static struct pipe3_data data_usb = { .mode = PIPE3_MODE_USBSS, .dpll_map = dpll_map_usb, + .settings = { + /* DRA75x TRM Table 26-17. Preferred USB3_PHY_RX SCP Register Settings */ + .ana_interface = INTERFACE_MODE_USBSS, + .ana_losd = 0xa, + .dig_fastlock = 1, + .dig_lbw = 3, + .dig_stepcnt = 0, + .dig_stl = 0x3, + .dig_thr = 1, + .dig_thr_mode = 1, + .dig_2ndo_sdm_mode = 0, + .dig_hs_rate = 0, + .dig_ovrd_hs_rate = 1, + .dll_trim_sel = 0x2, + .dll_phint_rate = 0x3, + .eq_lev = 0, + .eq_ftc = 0, + .eq_ctl = 0x9, + .eq_ovrd_lev = 0, + .eq_ovrd_ftc = 0, + }, }; static struct pipe3_data data_sata = { .mode = PIPE3_MODE_SATA, .dpll_map = dpll_map_sata, + .settings = { + /* DRA75x TRM Table 26-9. Preferred SATA_PHY_RX SCP Register Settings */ + .ana_interface = INTERFACE_MODE_SATA_3P0, + .ana_losd = 0x5, + .dig_fastlock = 1, + .dig_lbw = 3, + .dig_stepcnt = 0, + .dig_stl = 0x3, + .dig_thr = 1, + .dig_thr_mode = 1, + .dig_2ndo_sdm_mode = 0, + .dig_hs_rate = 0, /* Not in TRM preferred settings */ + .dig_ovrd_hs_rate = 0, /* Not in TRM preferred settings */ + .dll_trim_sel = 0x1, + .dll_phint_rate = 0x2, /* for 1.5 GHz DPLL clock */ + .eq_lev = 0, + .eq_ftc = 0x1f, + .eq_ctl = 0, + .eq_ovrd_lev = 1, + .eq_ovrd_ftc = 1, + }, }; static const struct udevice_id pipe3_phy_ids[] = { -- 2.39.5