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Date: Thu, 10 Nov 2022 13:10:42 +0530
From: Vinod Koul <vkoul@...nel.org>
To: Sandor Yu <Sandor.yu@....com>
Cc: dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-phy@...ts.infradead.org, andrzej.hajda@...el.com,
neil.armstrong@...aro.org, robert.foss@...aro.org,
Laurent.pinchart@...asonboard.com, jonas@...boo.se,
jernej.skrabec@...il.com, robh+dt@...nel.org,
krzysztof.kozlowski+dt@...aro.org, shawnguo@...nel.org,
s.hauer@...gutronix.de, kernel@...gutronix.de, linux-imx@....com,
tzimmermann@...e.de, lyude@...hat.com, javierm@...hat.com,
ville.syrjala@...ux.intel.com, sam@...nborg.org,
jani.nikula@...el.com, maxime@...no.tech,
penguin-kernel@...ove.sakura.ne.jp, oliver.brown@....com
Subject: Re: [PATCH v3 08/10] phy: cadence: Add driver for HDP-TX DisplyPort
PHY
On 08-11-22, 21:00, Sandor Yu wrote:
> Add Cadence HDP-TX DisplayPort PHY driver.
>
> Cadence HDP-TX PHY could be put in either DP mode or
> HDMI mode base on the configuration chosen.
> DisplayPort PHY mode is configurated in the driver.
>
> Signed-off-by: Sandor Yu <Sandor.yu@....com>
> ---
> drivers/phy/cadence/Kconfig | 8 +
> drivers/phy/cadence/Makefile | 1 +
> drivers/phy/cadence/phy-cadence-hdptx-dp.c | 774 +++++++++++++++++++++
> 3 files changed, 783 insertions(+)
> create mode 100644 drivers/phy/cadence/phy-cadence-hdptx-dp.c
>
> diff --git a/drivers/phy/cadence/Kconfig b/drivers/phy/cadence/Kconfig
> index 1adde2d99ae7..1e1914d3afdc 100644
> --- a/drivers/phy/cadence/Kconfig
> +++ b/drivers/phy/cadence/Kconfig
> @@ -46,3 +46,11 @@ config PHY_CADENCE_SALVO
> Enable this to support the Cadence SALVO PHY driver,
> this PHY is a legacy PHY, and only are used for USB3
> and USB2.
> +
> +config PHY_CADENCE_HDPTX_DP
alphabetically sorted please
> + tristate "Cadence HDPTX DP PHY Driver"
> + depends on OF && HAS_IOMEM
> + depends on COMMON_CLK
> + select GENERIC_PHY
> + help
> + Enable this to support the Cadence HDPTX DP PHY driver
> diff --git a/drivers/phy/cadence/Makefile b/drivers/phy/cadence/Makefile
> index e17f035ddece..fbdb0bc5ff11 100644
> --- a/drivers/phy/cadence/Makefile
> +++ b/drivers/phy/cadence/Makefile
> @@ -4,3 +4,4 @@ obj-$(CONFIG_PHY_CADENCE_DPHY) += cdns-dphy.o
> obj-$(CONFIG_PHY_CADENCE_DPHY_RX) += cdns-dphy-rx.o
> obj-$(CONFIG_PHY_CADENCE_SIERRA) += phy-cadence-sierra.o
> obj-$(CONFIG_PHY_CADENCE_SALVO) += phy-cadence-salvo.o
> +obj-$(CONFIG_PHY_CADENCE_HDPTX_DP) += phy-cadence-hdptx-dp.o
here too
> diff --git a/drivers/phy/cadence/phy-cadence-hdptx-dp.c b/drivers/phy/cadence/phy-cadence-hdptx-dp.c
> new file mode 100644
> index 000000000000..079d43772d1d
> --- /dev/null
> +++ b/drivers/phy/cadence/phy-cadence-hdptx-dp.c
> @@ -0,0 +1,774 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Cadence HDP-TX Display Port Interface (DP) PHY driver
> + *
> + * Copyright (C) 2022 NXP Semiconductor, Inc.
> + */
> +#include <asm/unaligned.h>
> +#include <linux/clk.h>
> +#include <linux/kernel.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/io.h>
> +#include <linux/iopoll.h>
> +
> +#include <drm/bridge/cdns-mhdp-mailbox.h>
> +
> +#define ADDR_PHY_AFE 0x80000
> +
> +/* PHY registers */
> +#define CMN_SSM_BIAS_TMR 0x0022
> +#define CMN_PLLSM0_PLLEN_TMR 0x0029
> +#define CMN_PLLSM0_PLLPRE_TMR 0x002A
> +#define CMN_PLLSM0_PLLVREF_TMR 0x002B
> +#define CMN_PLLSM0_PLLLOCK_TMR 0x002C
> +#define CMN_PLLSM0_USER_DEF_CTRL 0x002F
> +#define CMN_PSM_CLK_CTRL 0x0061
> +#define CMN_CDIAG_REFCLK_CTRL 0x0062
> +#define CMN_PLL0_VCOCAL_START 0x0081
> +#define CMN_PLL0_VCOCAL_INIT_TMR 0x0084
> +#define CMN_PLL0_VCOCAL_ITER_TMR 0x0085
> +#define CMN_PLL0_INTDIV 0x0094
> +#define CMN_PLL0_FRACDIV 0x0095
> +#define CMN_PLL0_HIGH_THR 0x0096
> +#define CMN_PLL0_DSM_DIAG 0x0097
> +#define CMN_PLL0_SS_CTRL1 0x0098
> +#define CMN_PLL0_SS_CTRL2 0x0099
> +#define CMN_ICAL_INIT_TMR 0x00C4
> +#define CMN_ICAL_ITER_TMR 0x00C5
> +#define CMN_RXCAL_INIT_TMR 0x00D4
> +#define CMN_RXCAL_ITER_TMR 0x00D5
> +#define CMN_TXPUCAL_CTRL 0x00E0
> +#define CMN_TXPUCAL_INIT_TMR 0x00E4
> +#define CMN_TXPUCAL_ITER_TMR 0x00E5
> +#define CMN_TXPDCAL_CTRL 0x00F0
> +#define CMN_TXPDCAL_INIT_TMR 0x00F4
> +#define CMN_TXPDCAL_ITER_TMR 0x00F5
> +#define CMN_ICAL_ADJ_INIT_TMR 0x0102
> +#define CMN_ICAL_ADJ_ITER_TMR 0x0103
> +#define CMN_RX_ADJ_INIT_TMR 0x0106
> +#define CMN_RX_ADJ_ITER_TMR 0x0107
> +#define CMN_TXPU_ADJ_CTRL 0x0108
> +#define CMN_TXPU_ADJ_INIT_TMR 0x010A
> +#define CMN_TXPU_ADJ_ITER_TMR 0x010B
> +#define CMN_TXPD_ADJ_CTRL 0x010c
> +#define CMN_TXPD_ADJ_INIT_TMR 0x010E
> +#define CMN_TXPD_ADJ_ITER_TMR 0x010F
> +#define CMN_DIAG_PLL0_FBH_OVRD 0x01C0
> +#define CMN_DIAG_PLL0_FBL_OVRD 0x01C1
> +#define CMN_DIAG_PLL0_OVRD 0x01C2
> +#define CMN_DIAG_PLL0_TEST_MODE 0x01C4
> +#define CMN_DIAG_PLL0_V2I_TUNE 0x01C5
> +#define CMN_DIAG_PLL0_CP_TUNE 0x01C6
> +#define CMN_DIAG_PLL0_LF_PROG 0x01C7
> +#define CMN_DIAG_PLL0_PTATIS_TUNE1 0x01C8
> +#define CMN_DIAG_PLL0_PTATIS_TUNE2 0x01C9
> +#define CMN_DIAG_PLL0_INCLK_CTRL 0x01CA
> +#define CMN_DIAG_PLL0_PXL_DIVH 0x01CB
> +#define CMN_DIAG_PLL0_PXL_DIVL 0x01CC
> +#define CMN_DIAG_HSCLK_SEL 0x01E0
> +#define CMN_DIAG_PER_CAL_ADJ 0x01EC
> +#define CMN_DIAG_CAL_CTRL 0x01ED
> +#define CMN_DIAG_ACYA 0x01FF
> +#define XCVR_PSM_RCTRL 0x4001
> +#define XCVR_PSM_CAL_TMR 0x4002
> +#define XCVR_PSM_A0IN_TMR 0x4003
> +#define TX_TXCC_CAL_SCLR_MULT_0 0x4047
> +#define TX_TXCC_CPOST_MULT_00_0 0x404C
> +#define TX_TXCC_MGNFS_MULT_000_0 0x4050
> +#define XCVR_DIAG_PLLDRC_CTRL 0x40E0
> +#define XCVR_DIAG_PLLDRC_CTRL 0x40E0
> +#define XCVR_DIAG_HSCLK_SEL 0x40E1
> +#define XCVR_DIAG_BIDI_CTRL 0x40E8
> +#define XCVR_DIAG_LANE_FCM_EN_MGN_TMR 0x40F2
> +#define XCVR_DIAG_LANE_FCM_EN_MGN 0x40F2
> +#define TX_PSC_A0 0x4100
> +#define TX_PSC_A1 0x4101
> +#define TX_PSC_A2 0x4102
> +#define TX_PSC_A3 0x4103
> +#define TX_RCVDET_CTRL 0x4120
> +#define TX_RCVDET_EN_TMR 0x4122
> +#define TX_RCVDET_EN_TMR 0x4122
> +#define TX_RCVDET_ST_TMR 0x4123
> +#define TX_RCVDET_ST_TMR 0x4123
> +#define TX_BIST_CTRL 0x4140
> +#define TX_BIST_UDDWR 0x4141
> +#define TX_DIAG_TX_CTRL 0x41E0
> +#define TX_DIAG_TX_DRV 0x41E1
> +#define TX_DIAG_BGREF_PREDRV_DELAY 0x41E7
> +#define TX_DIAG_BGREF_PREDRV_DELAY 0x41E7
> +#define XCVR_PSM_RCTRL_1 0x4201
> +#define TX_TXCC_CAL_SCLR_MULT_1 0x4247
> +#define TX_TXCC_CPOST_MULT_00_1 0x424C
> +#define TX_TXCC_MGNFS_MULT_000_1 0x4250
> +#define XCVR_DIAG_PLLDRC_CTRL_1 0x42E0
> +#define XCVR_DIAG_HSCLK_SEL_1 0x42E1
> +#define XCVR_DIAG_LANE_FCM_EN_MGN_TMR_1 0x42F2
> +#define TX_RCVDET_EN_TMR_1 0x4322
> +#define TX_RCVDET_ST_TMR_1 0x4323
> +#define TX_DIAG_ACYA_0 0x41FF
> +#define TX_DIAG_ACYA_1 0x43FF
> +#define TX_DIAG_ACYA_2 0x45FF
> +#define TX_DIAG_ACYA_3 0x47FF
> +#define TX_ANA_CTRL_REG_1 0x5020
> +#define TX_ANA_CTRL_REG_2 0x5021
> +#define TXDA_COEFF_CALC 0x5022
> +#define TX_DIG_CTRL_REG_1 0x5023
> +#define TX_DIG_CTRL_REG_2 0x5024
> +#define TXDA_CYA_AUXDA_CYA 0x5025
> +#define TX_ANA_CTRL_REG_3 0x5026
> +#define TX_ANA_CTRL_REG_4 0x5027
> +#define TX_ANA_CTRL_REG_5 0x5029
> +#define RX_PSC_A0 0x8000
> +#define RX_PSC_CAL 0x8006
> +#define PMA_LANE_CFG 0xC000
> +#define PIPE_CMN_CTRL1 0xC001
> +#define PIPE_CMN_CTRL2 0xC002
> +#define PIPE_COM_LOCK_CFG1 0xC003
> +#define PIPE_COM_LOCK_CFG2 0xC004
> +#define PIPE_RCV_DET_INH 0xC005
> +#define PHY_HDP_MODE_CTRL 0xC008
> +#define PHY_HDP_CLK_CTL 0xC009
> +#define STS 0xC00F
> +#define PHY_ISO_CMN_CTRL 0xC010
> +#define PHY_ISO_CMN_CTRL 0xC010
> +#define PHY_HDP_TX_CTL_L0 0xC408
> +#define PHY_DP_TX_CTL 0xC408
> +#define PHY_HDP_TX_CTL_L1 0xC448
> +#define PHY_HDP_TX_CTL_L2 0xC488
> +#define PHY_HDP_TX_CTL_L3 0xC4C8
> +#define PHY_PMA_CMN_CTRL1 0xC800
> +#define PMA_CMN_CTRL1 0xC800
> +#define PHY_PMA_ISO_CMN_CTRL 0xC810
> +#define PHY_PMA_ISO_PLL_CTRL1 0xC812
> +#define PHY_PMA_ISOLATION_CTRL 0xC81F
> +#define PHY_ISOLATION_CTRL 0xC81F
> +#define PHY_PMA_ISO_XCVR_CTRL 0xCC11
> +#define PHY_PMA_ISO_LINK_MODE 0xCC12
> +#define PHY_PMA_ISO_PWRST_CTRL 0xCC13
> +#define PHY_PMA_ISO_TX_DATA_LO 0xCC14
> +#define PHY_PMA_ISO_TX_DATA_HI 0xCC15
> +#define PHY_PMA_ISO_RX_DATA_LO 0xCC16
> +#define PHY_PMA_ISO_RX_DATA_HI 0xCC17
do you use all these?
> +
> +#define MAX_NUM_LANES 4
> +#define DEFAULT_MAX_BIT_RATE 5400 /* in Mbps */
> +
> +#define REF_CLK_27MHZ 27000000
> +
> +enum dp_link_rate {
> + RATE_1_6 = 162000,
> + RATE_2_1 = 216000,
> + RATE_2_4 = 243000,
> + RATE_2_7 = 270000,
> + RATE_3_2 = 324000,
> + RATE_4_3 = 432000,
> + RATE_5_4 = 540000,
> + RATE_8_1 = 810000,
> +};
> +
> +struct phy_pll_reg {
> + u16 val[7];
> + u32 addr;
> +};
> +
> +static const struct phy_pll_reg phy_pll_27m_cfg[] = {
> + /* 1.62 2.16 2.43 2.7 3.24 4.32 5.4 register address */
> + {{ 0x010E, 0x010E, 0x010E, 0x010E, 0x010E, 0x010E, 0x010E }, CMN_PLL0_VCOCAL_INIT_TMR },
> + {{ 0x001B, 0x001B, 0x001B, 0x001B, 0x001B, 0x001B, 0x001B }, CMN_PLL0_VCOCAL_ITER_TMR },
> + {{ 0x30B9, 0x3087, 0x3096, 0x30B4, 0x30B9, 0x3087, 0x30B4 }, CMN_PLL0_VCOCAL_START },
> + {{ 0x0077, 0x009F, 0x00B3, 0x00C7, 0x0077, 0x009F, 0x00C7 }, CMN_PLL0_INTDIV },
> + {{ 0xF9DA, 0xF7CD, 0xF6C7, 0xF5C1, 0xF9DA, 0xF7CD, 0xF5C1 }, CMN_PLL0_FRACDIV },
> + {{ 0x001E, 0x0028, 0x002D, 0x0032, 0x001E, 0x0028, 0x0032 }, CMN_PLL0_HIGH_THR },
> + {{ 0x0020, 0x0020, 0x0020, 0x0020, 0x0020, 0x0020, 0x0020 }, CMN_PLL0_DSM_DIAG },
> + {{ 0x0000, 0x1000, 0x1000, 0x1000, 0x0000, 0x1000, 0x1000 }, CMN_PLLSM0_USER_DEF_CTRL },
> + {{ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000 }, CMN_DIAG_PLL0_OVRD },
> + {{ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000 }, CMN_DIAG_PLL0_FBH_OVRD },
> + {{ 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000 }, CMN_DIAG_PLL0_FBL_OVRD },
> + {{ 0x0006, 0x0007, 0x0007, 0x0007, 0x0006, 0x0007, 0x0007 }, CMN_DIAG_PLL0_V2I_TUNE },
> + {{ 0x0043, 0x0043, 0x0043, 0x0042, 0x0043, 0x0043, 0x0042 }, CMN_DIAG_PLL0_CP_TUNE },
> + {{ 0x0008, 0x0008, 0x0008, 0x0008, 0x0008, 0x0008, 0x0008 }, CMN_DIAG_PLL0_LF_PROG },
> + {{ 0x0100, 0x0001, 0x0001, 0x0001, 0x0100, 0x0001, 0x0001 }, CMN_DIAG_PLL0_PTATIS_TUNE1 },
> + {{ 0x0007, 0x0001, 0x0001, 0x0001, 0x0007, 0x0001, 0x0001 }, CMN_DIAG_PLL0_PTATIS_TUNE2 },
> + {{ 0x0020, 0x0020, 0x0020, 0x0020, 0x0020, 0x0020, 0x0020 }, CMN_DIAG_PLL0_TEST_MODE},
> + {{ 0x0016, 0x0016, 0x0016, 0x0016, 0x0016, 0x0016, 0x0016 }, CMN_PSM_CLK_CTRL }
> +};
> +
> +struct cdns_hdptx_dp_phy {
> + void __iomem *regs; /* DPTX registers base */
> + struct device *dev;
> + struct phy *phy;
> + struct mutex mbox_mutex; /* mutex to protect mailbox */
> + struct clk *ref_clk;
> + u32 ref_clk_rate;
> + u32 num_lanes;
> + u32 max_bit_rate; /* Maximum link bit rate to use (in Mbps) */
> + u32 link_rate;
> + bool power_up;
> +};
> +
> +static int cdns_phy_reg_write(struct cdns_hdptx_dp_phy *cdns_phy, u32 addr, u32 val)
> +{
> + return cdns_mhdp_reg_write(cdns_phy, ADDR_PHY_AFE + (addr << 2), val);
> +}
> +
> +static u32 cdns_phy_reg_read(struct cdns_hdptx_dp_phy *cdns_phy, u32 addr)
> +{
> + u32 reg32;
> +
> + cdns_mhdp_reg_read(cdns_phy, ADDR_PHY_AFE + (addr << 2), ®32);
> + return reg32;
> +}
> +
> +static int link_rate_index(u32 rate)
> +{
> + switch (rate) {
> + case RATE_1_6:
> + return 0;
> + case RATE_2_1:
> + return 1;
> + case RATE_2_4:
> + return 2;
> + case RATE_2_7:
> + return 3;
> + case RATE_3_2:
> + return 4;
> + case RATE_4_3:
> + return 5;
> + case RATE_5_4:
> + return 6;
> + default:
> + return -1;
> + }
> +}
> +
> +static int hdptx_dp_ref_clk(struct cdns_hdptx_dp_phy *cdns_phy)
> +{
> + struct device *dev = cdns_phy->dev;
> + u32 ref_clk_rate;
> + int ret;
> +
> + cdns_phy->ref_clk = devm_clk_get(dev, "refclk");
> + if (IS_ERR(cdns_phy->ref_clk)) {
> + dev_err(dev, "phy ref clock not found\n");
> + return PTR_ERR(cdns_phy->ref_clk);
> + }
> +
> + ret = clk_prepare_enable(cdns_phy->ref_clk);
> + if (ret) {
> + dev_err(cdns_phy->dev, "Failed to prepare ref clock\n");
> + return ret;
> + }
> +
> + ref_clk_rate = clk_get_rate(cdns_phy->ref_clk);
> + if (!ref_clk_rate) {
> + dev_err(cdns_phy->dev, "Failed to get ref clock rate\n");
> + goto err_ref_clk;
> + }
> +
> + if (ref_clk_rate == REF_CLK_27MHZ)
> + cdns_phy->ref_clk_rate = ref_clk_rate;
> + else {
> + dev_err(cdns_phy->dev, "Not support Ref Clock Rate(%dHz)\n", ref_clk_rate);
> + goto err_ref_clk;
> + }
> +
> + return 0;
> +
> +err_ref_clk:
> + clk_disable_unprepare(cdns_phy->ref_clk);
> + return -EINVAL;
> +}
> +
> +static void hdptx_dp_aux_cfg(struct cdns_hdptx_dp_phy *cdns_phy)
> +{
> + /* Power up Aux */
> + cdns_phy_reg_write(cdns_phy, TXDA_CYA_AUXDA_CYA, 1);
> +
> + cdns_phy_reg_write(cdns_phy, TX_DIG_CTRL_REG_1, 0x3);
> + ndelay(150);
> + cdns_phy_reg_write(cdns_phy, TX_DIG_CTRL_REG_2, 36);
> + ndelay(150);
> + cdns_phy_reg_write(cdns_phy, TX_ANA_CTRL_REG_2, 0x0100);
> + ndelay(150);
> + cdns_phy_reg_write(cdns_phy, TX_ANA_CTRL_REG_2, 0x0300);
> + ndelay(150);
> + cdns_phy_reg_write(cdns_phy, TX_ANA_CTRL_REG_3, 0x0000);
> + ndelay(150);
> + cdns_phy_reg_write(cdns_phy, TX_ANA_CTRL_REG_1, 0x2008);
> + ndelay(150);
> + cdns_phy_reg_write(cdns_phy, TX_ANA_CTRL_REG_1, 0x2018);
> + ndelay(150);
> + cdns_phy_reg_write(cdns_phy, TX_ANA_CTRL_REG_1, 0xA018);
> + ndelay(150);
> + cdns_phy_reg_write(cdns_phy, TX_ANA_CTRL_REG_2, 0x030C);
> + ndelay(150);
> + cdns_phy_reg_write(cdns_phy, TX_ANA_CTRL_REG_5, 0x0000);
> + ndelay(150);
> + cdns_phy_reg_write(cdns_phy, TX_ANA_CTRL_REG_4, 0x1001);
> + ndelay(150);
> + cdns_phy_reg_write(cdns_phy, TX_ANA_CTRL_REG_1, 0xA098);
> + ndelay(150);
> + cdns_phy_reg_write(cdns_phy, TX_ANA_CTRL_REG_1, 0xA198);
> + ndelay(150);
> + cdns_phy_reg_write(cdns_phy, TX_ANA_CTRL_REG_2, 0x030d);
> + ndelay(150);
> + cdns_phy_reg_write(cdns_phy, TX_ANA_CTRL_REG_2, 0x030f);
> +}
> +
> +/* PMA common configuration for 27MHz */
> +static void hdptx_dp_phy_pma_cmn_cfg_27mhz(struct cdns_hdptx_dp_phy *cdns_phy)
> +{
> + u32 num_lanes = cdns_phy->num_lanes;
> + u16 val;
> + int k;
> +
> + val = cdns_phy_reg_read(cdns_phy, PHY_PMA_CMN_CTRL1);
> + val &= 0xFFF7;
> + val |= 0x0008;
> + cdns_phy_reg_write(cdns_phy, PHY_PMA_CMN_CTRL1, val);
> +
> + /* Startup state machine registers */
> + cdns_phy_reg_write(cdns_phy, CMN_SSM_BIAS_TMR, 0x0087);
> + cdns_phy_reg_write(cdns_phy, CMN_PLLSM0_PLLEN_TMR, 0x001B);
> + cdns_phy_reg_write(cdns_phy, CMN_PLLSM0_PLLPRE_TMR, 0x0036);
> + cdns_phy_reg_write(cdns_phy, CMN_PLLSM0_PLLVREF_TMR, 0x001B);
> + cdns_phy_reg_write(cdns_phy, CMN_PLLSM0_PLLLOCK_TMR, 0x006C);
> +
> + /* Current calibration registers */
> + cdns_phy_reg_write(cdns_phy, CMN_ICAL_INIT_TMR, 0x0044);
> + cdns_phy_reg_write(cdns_phy, CMN_ICAL_ITER_TMR, 0x0006);
> + cdns_phy_reg_write(cdns_phy, CMN_ICAL_ADJ_INIT_TMR, 0x0022);
> + cdns_phy_reg_write(cdns_phy, CMN_ICAL_ADJ_ITER_TMR, 0x0006);
> +
> + /* Resistor calibration registers */
> + cdns_phy_reg_write(cdns_phy, CMN_TXPUCAL_INIT_TMR, 0x0022);
> + cdns_phy_reg_write(cdns_phy, CMN_TXPUCAL_ITER_TMR, 0x0006);
> + cdns_phy_reg_write(cdns_phy, CMN_TXPU_ADJ_INIT_TMR, 0x0022);
> + cdns_phy_reg_write(cdns_phy, CMN_TXPU_ADJ_ITER_TMR, 0x0006);
> + cdns_phy_reg_write(cdns_phy, CMN_TXPDCAL_INIT_TMR, 0x0022);
> + cdns_phy_reg_write(cdns_phy, CMN_TXPDCAL_ITER_TMR, 0x0006);
> + cdns_phy_reg_write(cdns_phy, CMN_TXPD_ADJ_INIT_TMR, 0x0022);
> + cdns_phy_reg_write(cdns_phy, CMN_TXPD_ADJ_ITER_TMR, 0x0006);
> + cdns_phy_reg_write(cdns_phy, CMN_RXCAL_INIT_TMR, 0x0022);
> + cdns_phy_reg_write(cdns_phy, CMN_RXCAL_ITER_TMR, 0x0006);
> + cdns_phy_reg_write(cdns_phy, CMN_RX_ADJ_INIT_TMR, 0x0022);
> + cdns_phy_reg_write(cdns_phy, CMN_RX_ADJ_ITER_TMR, 0x0006);
> +
> + for (k = 0; k < num_lanes; k = k + 1) {
> + /* Power state machine registers */
> + cdns_phy_reg_write(cdns_phy, XCVR_PSM_CAL_TMR | (k << 9), 0x016D);
> + cdns_phy_reg_write(cdns_phy, XCVR_PSM_A0IN_TMR | (k << 9), 0x016D);
> + /* Transceiver control and diagnostic registers */
> + cdns_phy_reg_write(cdns_phy, XCVR_DIAG_LANE_FCM_EN_MGN_TMR | (k << 9), 0x00A2);
> + cdns_phy_reg_write(cdns_phy, TX_DIAG_BGREF_PREDRV_DELAY | (k << 9), 0x0097);
> + /* Transmitter receiver detect registers */
> + cdns_phy_reg_write(cdns_phy, TX_RCVDET_EN_TMR | (k << 9), 0x0A8C);
> + cdns_phy_reg_write(cdns_phy, TX_RCVDET_ST_TMR | (k << 9), 0x0036);
> + }
> +
> + cdns_phy_reg_write(cdns_phy, TX_DIAG_ACYA_0, 1);
> + cdns_phy_reg_write(cdns_phy, TX_DIAG_ACYA_1, 1);
> + cdns_phy_reg_write(cdns_phy, TX_DIAG_ACYA_2, 1);
> + cdns_phy_reg_write(cdns_phy, TX_DIAG_ACYA_3, 1);
> +}
> +
> +static void hdptx_dp_phy_pma_cmn_pll0_27mhz(struct cdns_hdptx_dp_phy *cdns_phy)
> +{
> + u32 num_lanes = cdns_phy->num_lanes;
> + u32 link_rate = cdns_phy->link_rate;
> + u16 val;
> + int index, i, k;
> +
> + /* DP PLL data rate 0/1 clock divider value */
> + val = cdns_phy_reg_read(cdns_phy, PHY_HDP_CLK_CTL);
> + val &= 0x00FF;
> + if (link_rate <= RATE_2_7)
> + val |= 0x2400;
> + else
> + val |= 0x1200;
> + cdns_phy_reg_write(cdns_phy, PHY_HDP_CLK_CTL, val);
> +
> + /* High speed clock 0/1 div */
> + val = cdns_phy_reg_read(cdns_phy, CMN_DIAG_HSCLK_SEL);
> + val &= 0xFFCC;
> + if (link_rate <= RATE_2_7)
> + val |= 0x0011;
> + cdns_phy_reg_write(cdns_phy, CMN_DIAG_HSCLK_SEL, val);
> +
> + for (k = 0; k < num_lanes; k++) {
> + val = cdns_phy_reg_read(cdns_phy, (XCVR_DIAG_HSCLK_SEL | (k << 9)));
> + val = val & 0xCFFF;
> + if (link_rate <= RATE_2_7)
> + val |= 0x1000;
> + cdns_phy_reg_write(cdns_phy, (XCVR_DIAG_HSCLK_SEL | (k << 9)), val);
> + }
> +
> + /* DP PHY PLL 27MHz configuration */
> + index = link_rate_index(link_rate);
> + for (i = 0; i < ARRAY_SIZE(phy_pll_27m_cfg); i++)
> + cdns_phy_reg_write(cdns_phy, phy_pll_27m_cfg[i].addr,
> + phy_pll_27m_cfg[i].val[index]);
> +
> + /* Transceiver control and diagnostic registers */
> + for (k = 0; k < num_lanes; k++) {
> + val = cdns_phy_reg_read(cdns_phy, (XCVR_DIAG_PLLDRC_CTRL | (k << 9)));
> + val = val & 0x8FFF;
> + if (link_rate <= RATE_2_7)
> + val |= 0x2000;
> + else
> + val |= 0x1000;
> + cdns_phy_reg_write(cdns_phy, (XCVR_DIAG_PLLDRC_CTRL | (k << 9)), val);
> + }
> +
> + for (k = 0; k < num_lanes; k = k + 1) {
> + /* Power state machine registers */
> + cdns_phy_reg_write(cdns_phy, (XCVR_PSM_RCTRL | (k << 9)), 0xBEFC);
> + cdns_phy_reg_write(cdns_phy, (TX_PSC_A0 | (k << 9)), 0x6799);
> + cdns_phy_reg_write(cdns_phy, (TX_PSC_A1 | (k << 9)), 0x6798);
> + cdns_phy_reg_write(cdns_phy, (TX_PSC_A2 | (k << 9)), 0x0098);
> + cdns_phy_reg_write(cdns_phy, (TX_PSC_A3 | (k << 9)), 0x0098);
> + /* Receiver calibration power state definition register */
> + val = cdns_phy_reg_read(cdns_phy, RX_PSC_CAL | (k << 9));
> + val &= 0xFFBB;
> + cdns_phy_reg_write(cdns_phy, (RX_PSC_CAL | (k << 9)), val);
> + val = cdns_phy_reg_read(cdns_phy, RX_PSC_A0 | (k << 9));
> + val &= 0xFFBB;
> + cdns_phy_reg_write(cdns_phy, (RX_PSC_A0 | (k << 9)), val);
> + }
> +}
> +
> +static void hdptx_dp_phy_ref_clock_type(struct cdns_hdptx_dp_phy *cdns_phy)
> +{
> + u32 val;
> +
> + val = cdns_phy_reg_read(cdns_phy, PHY_PMA_CMN_CTRL1);
> + val &= 0xFF8F;
> + /*
> + * single ended reference clock (val |= 0x0030);
> + * differential clock (val |= 0x0000);
> + *
> + * for differential clock on the refclk_p and
> + * refclk_m off chip pins: CMN_DIAG_ACYA[8]=1'b1
> + * cdns_phy_reg_write(cdns_phy, CMN_DIAG_ACYA, 0x0100);
> + */
> + val |= 0x0030;
> + cdns_phy_reg_write(cdns_phy, PHY_PMA_CMN_CTRL1, val);
> +}
> +
> +static int hdptx_dp_phy_power_up(struct cdns_hdptx_dp_phy *cdns_phy)
> +{
> + u32 val, i;
> +
> + /* Enable HDP PLL’s for high speed clocks */
> + val = cdns_phy_reg_read(cdns_phy, PHY_HDP_CLK_CTL);
> + val |= (1 << 0);
> + cdns_phy_reg_write(cdns_phy, PHY_HDP_CLK_CTL, val);
> + /* Wait for PLL ready ACK */
> + for (i = 0; i < 10; i++) {
> + val = cdns_phy_reg_read(cdns_phy, PHY_HDP_CLK_CTL);
> + if (val & (1 << 1))
> + break;
> + msleep(20);
> + }
> + if (i == 10) {
> + dev_err(cdns_phy->dev, "Wait PLL Ack failed\n");
> + return -1;
> + }
> +
> + /* Enable HDP PLL’s data rate and full rate clocks out of PMA. */
> + val = cdns_phy_reg_read(cdns_phy, PHY_HDP_CLK_CTL);
> + val |= (1 << 2);
> + cdns_phy_reg_write(cdns_phy, PHY_HDP_CLK_CTL, val);
> + /* Wait for PLL clock enable ACK */
> + for (i = 0; i < 10; i++) {
> + val = cdns_phy_reg_read(cdns_phy, PHY_HDP_CLK_CTL);
> + if (val & (1 << 3))
> + break;
> + msleep(20);
> + }
> + if (i == 10) {
> + dev_err(cdns_phy->dev, "Wait PLL clock enable ACk failed\n");
> + return -1;
> + }
> +
> + /* Configure PHY in A2 Mode */
> + cdns_phy_reg_write(cdns_phy, PHY_HDP_MODE_CTRL, 0x0004);
> + /* Wait for Power State A2 Ack */
> + for (i = 0; i < 10; i++) {
> + val = cdns_phy_reg_read(cdns_phy, PHY_HDP_MODE_CTRL);
> + if (val & (1 << 6))
> + break;
> + msleep(20);
> + }
> + if (i == 10) {
> + dev_err(cdns_phy->dev, "Wait A2 Ack failed\n");
> + return -1;
> + }
> +
> + /* Configure PHY in A0 mode (PHY must be in the A0 power
> + * state in order to transmit data)
> + */
> + cdns_phy_reg_write(cdns_phy, PHY_HDP_MODE_CTRL, 0x0101);
> +
> + /* Wait for Power State A0 Ack */
> + for (i = 0; i < 10; i++) {
> + val = cdns_phy_reg_read(cdns_phy, PHY_HDP_MODE_CTRL);
> + if (val & (1 << 4))
> + break;
> + msleep(20);
> + }
> + if (i == 10) {
> + dev_err(cdns_phy->dev, "Wait A0 Ack failed\n");
> + return -1;
> + }
> +
> + cdns_phy->power_up = true;
> +
> + return 0;
> +}
> +
> +static void hdptx_dp_phy_power_down(struct cdns_hdptx_dp_phy *cdns_phy)
> +{
> + u16 val;
> + int i;
> +
> + if (!cdns_phy->power_up)
> + return;
> +
> + /* Place the PHY lanes in the A3 power state. */
> + cdns_phy_reg_write(cdns_phy, PHY_HDP_MODE_CTRL, 0x8);
> + /* Wait for Power State A3 Ack */
> + for (i = 0; i < 10; i++) {
> + val = cdns_phy_reg_read(cdns_phy, PHY_HDP_MODE_CTRL);
> + if (val & (1 << 7))
> + break;
> + msleep(20);
> + }
> + if (i == 10) {
> + dev_err(cdns_phy->dev, "Wait A3 Ack failed\n");
> + return;
> + }
> +
> + /* Disable HDP PLL’s data rate and full rate clocks out of PMA. */
> + val = cdns_phy_reg_read(cdns_phy, PHY_HDP_CLK_CTL);
> + val &= ~(1 << 2);
> + cdns_phy_reg_write(cdns_phy, PHY_HDP_CLK_CTL, val);
> + /* Wait for PLL clock gate ACK */
> + for (i = 0; i < 10; i++) {
> + val = cdns_phy_reg_read(cdns_phy, PHY_HDP_CLK_CTL);
> + if (!(val & (1 << 3)))
> + break;
> + msleep(20);
> + }
> + if (i == 10) {
> + dev_err(cdns_phy->dev, "Wait PLL clock gate Ack failed\n");
> + return;
> + }
> +
> + /* Disable HDP PLL’s for high speed clocks */
> + val = cdns_phy_reg_read(cdns_phy, PHY_HDP_CLK_CTL);
> + val &= ~(1 << 0);
> + cdns_phy_reg_write(cdns_phy, PHY_HDP_CLK_CTL, val);
> + /* Wait for PLL disable ACK */
> + for (i = 0; i < 10; i++) {
> + val = cdns_phy_reg_read(cdns_phy, PHY_HDP_CLK_CTL);
> + if (!(val & (1 << 1)))
> + break;
> + msleep(20);
> + }
> + if (i == 10) {
> + dev_err(cdns_phy->dev, "Wait PLL disable Ack failed\n");
> + return;
> + }
> +}
> +
> +static int cdns_hdptx_dp_phy_on(struct phy *phy)
> +{
> + struct cdns_hdptx_dp_phy *cdns_phy = phy_get_drvdata(phy);
> +
> + return hdptx_dp_phy_power_up(cdns_phy);
> +}
> +
> +static int cdns_hdptx_dp_phy_off(struct phy *phy)
> +{
> + struct cdns_hdptx_dp_phy *cdns_phy = phy_get_drvdata(phy);
> +
> + hdptx_dp_phy_power_down(cdns_phy);
> +
> + return 0;
> +}
> +
> +static int cdns_hdptx_dp_phy_init(struct phy *phy)
> +{
> + struct cdns_hdptx_dp_phy *cdns_phy = phy_get_drvdata(phy);
> + int ret;
> +
> + hdptx_dp_phy_ref_clock_type(cdns_phy);
> +
> + /* PHY power up */
> + ret = hdptx_dp_phy_power_up(cdns_phy);
> + if (ret < 0)
> + return ret;
> +
> + hdptx_dp_aux_cfg(cdns_phy);
> +
> + return ret;
> +}
> +
> +static int cdns_hdptx_dp_configure(struct phy *phy,
> + union phy_configure_opts *opts)
> +{
> + struct cdns_hdptx_dp_phy *cdns_phy = phy_get_drvdata(phy);
> + int ret;
> +
> + cdns_phy->link_rate = opts->dp.link_rate;
> +
> + /* Disable phy clock if PHY in power up state */
> + hdptx_dp_phy_power_down(cdns_phy);
> +
> + if (cdns_phy->ref_clk_rate == REF_CLK_27MHZ) {
> + hdptx_dp_phy_pma_cmn_cfg_27mhz(cdns_phy);
> + hdptx_dp_phy_pma_cmn_pll0_27mhz(cdns_phy);
> + } else
> + dev_err(cdns_phy->dev, "Not support ref clock rate\n");
> +
> + /* PHY power up */
> + ret = hdptx_dp_phy_power_up(cdns_phy);
> +
> + return ret;
> +}
> +
> +static const struct phy_ops cdns_hdptx_dp_phy_ops = {
> + .init = cdns_hdptx_dp_phy_init,
> + .configure = cdns_hdptx_dp_configure,
> + .power_on = cdns_hdptx_dp_phy_on,
> + .power_off = cdns_hdptx_dp_phy_off,
> + .owner = THIS_MODULE,
> +};
> +
> +static int cdns_hdptx_dp_phy_probe(struct platform_device *pdev)
> +{
> + struct cdns_hdptx_dp_phy *cdns_phy;
> + struct device *dev = &pdev->dev;
> + struct device_node *node = dev->of_node;
> + struct phy_provider *phy_provider;
> + struct resource *res;
> + struct phy *phy;
> + int ret;
> +
> + cdns_phy = devm_kzalloc(dev, sizeof(*cdns_phy), GFP_KERNEL);
> + if (!cdns_phy)
> + return -ENOMEM;
> +
> + dev_set_drvdata(dev, cdns_phy);
> + cdns_phy->dev = dev;
> + mutex_init(&cdns_phy->mbox_mutex);
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res)
> + return -ENODEV;
> + cdns_phy->regs = devm_ioremap(dev, res->start, resource_size(res));
> + if (IS_ERR(cdns_phy->regs))
> + return PTR_ERR(cdns_phy->regs);
> +
> + if (of_property_read_u32(node, "cdns,num-lanes",
> + &cdns_phy->num_lanes)) {
> + dev_err(dev, "%s: No \"cdns,num-lanes\"-property.\n",
> + node->full_name);
> + return -EINVAL;
> + }
> +
> + phy = devm_phy_create(dev, node, &cdns_hdptx_dp_phy_ops);
> + if (IS_ERR(phy))
> + return PTR_ERR(phy);
> +
> + cdns_phy->max_bit_rate = DEFAULT_MAX_BIT_RATE;
> + of_property_read_u32(node, "cdns,max-bit-rate",
> + &cdns_phy->max_bit_rate);
> +
> + switch (cdns_phy->max_bit_rate) {
> + /* valid bit rate */
> + case 1620:
> + case 2160:
> + case 2430:
> + case 2700:
> + case 3240:
> + case 4320:
> + case 5400:
> + break;
> + case 8100:
> + default:
> + dev_err(dev, "unsupported max bit rate: %dMbps\n",
> + cdns_phy->max_bit_rate);
> + return -EINVAL;
> + }
> +
> + dev_dbg(dev, "DP max bit rate %d.%03d Gbps\n",
> + cdns_phy->max_bit_rate / 1000,
> + cdns_phy->max_bit_rate % 1000);
> +
> + phy->attrs.bus_width = cdns_phy->num_lanes;
> + phy->attrs.max_link_rate = cdns_phy->max_bit_rate;
> + phy->attrs.mode = PHY_MODE_DP;
> +
> + cdns_phy->phy = phy;
> + phy_set_drvdata(phy, cdns_phy);
> +
> + if (cdns_phy->num_lanes > MAX_NUM_LANES) {
> + dev_err(dev, "Invalid lane configuration\n");
> + return -EINVAL;
> + }
> +
> + ret = hdptx_dp_ref_clk(cdns_phy);
> + if (ret) {
> + dev_err(dev, "Init clk fail\n");
> + return -EINVAL;
> + }
> +
> + phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
> + if (IS_ERR(phy_provider)) {
> + ret = PTR_ERR(phy_provider);
> + goto clk_disable;
> + }
> +
> + dev_dbg(dev, "link: (%d lanes)", cdns_phy->num_lanes);
> +
> + return 0;
> +
> +clk_disable:
> + clk_disable_unprepare(cdns_phy->ref_clk);
> +
> + return -EINVAL;
> +}
> +
> +static int cdns_hdptx_dp_phy_remove(struct platform_device *pdev)
> +{
> + struct cdns_hdptx_dp_phy *cdns_phy = platform_get_drvdata(pdev);
> +
> + clk_disable_unprepare(cdns_phy->ref_clk);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id cdns_hdptx_dp_phy_of_match[] = {
> + {
> + .compatible = "cdns,hdptx-dp-phy",
> + },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, cdns_hdptx_dp_phy_of_match);
> +
> +static struct platform_driver cdns_hdptx_dp_phy_driver = {
> + .probe = cdns_hdptx_dp_phy_probe,
> + .remove = cdns_hdptx_dp_phy_remove,
> + .driver = {
> + .name = "cdns-hdptx-dp-phy",
> + .of_match_table = cdns_hdptx_dp_phy_of_match,
> + }
> +};
> +module_platform_driver(cdns_hdptx_dp_phy_driver);
> +
> +MODULE_AUTHOR("Sandor Yu <sandor.yu@....com>");
> +MODULE_DESCRIPTION("Cadence HDP-TX DisplayPort PHY driver");
> +MODULE_LICENSE("GPL");
> --
> 2.34.1
--
~Vinod
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