[PATCH v12 6/7] phy: freescale: Add DisplayPort PHY driver for i.MX8MQ

From: Sandor Yu
Date: Tue Jan 09 2024 - 20:11:44 EST

Add Cadence HDP-TX DisplayPort PHY driver for i.MX8MQ

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@xxxxxxx>
---
v11->v12:
- Return error code to replace -1 for function wait_for_ack().
- Set cdns_phy->power_up = false in phy_power_down function.
- Remove "RATE_8_1 = 810000", it is not used in driver.
- Add year 2024 to copyright.

drivers/phy/freescale/Kconfig | 10 +
drivers/phy/freescale/Makefile | 1 +
drivers/phy/freescale/phy-fsl-imx8mq-dp.c | 726 ++++++++++++++++++++++
3 files changed, 737 insertions(+)
create mode 100644 drivers/phy/freescale/phy-fsl-imx8mq-dp.c

diff --git a/drivers/phy/freescale/Kconfig b/drivers/phy/freescale/Kconfig
index 853958fb2c063..c39709fd700ac 100644
--- a/drivers/phy/freescale/Kconfig
+++ b/drivers/phy/freescale/Kconfig
@@ -35,6 +35,16 @@ config PHY_FSL_IMX8M_PCIE
Enable this to add support for the PCIE PHY as found on
i.MX8M family of SOCs.

+config PHY_FSL_IMX8MQ_DP
+ tristate "Freescale i.MX8MQ DP PHY support"
+ depends on OF && HAS_IOMEM
+ depends on COMMON_CLK
+ select GENERIC_PHY
+ select CDNS_MHDP_HELPER
+ help
+ Enable this to support the Cadence HDPTX DP PHY driver
+ on i.MX8MQ SOC.
+
endif

config PHY_FSL_LYNX_28G
diff --git a/drivers/phy/freescale/Makefile b/drivers/phy/freescale/Makefile
index cedb328bc4d28..47e5285209fa8 100644
--- a/drivers/phy/freescale/Makefile
+++ b/drivers/phy/freescale/Makefile
@@ -1,4 +1,5 @@
# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_PHY_FSL_IMX8MQ_DP) += phy-fsl-imx8mq-dp.o
obj-$(CONFIG_PHY_FSL_IMX8MQ_USB) += phy-fsl-imx8mq-usb.o
obj-$(CONFIG_PHY_MIXEL_LVDS_PHY) += phy-fsl-imx8qm-lvds-phy.o
obj-$(CONFIG_PHY_MIXEL_MIPI_DPHY) += phy-fsl-imx8-mipi-dphy.o
diff --git a/drivers/phy/freescale/phy-fsl-imx8mq-dp.c b/drivers/phy/freescale/phy-fsl-imx8mq-dp.c
new file mode 100644
index 0000000000000..2e24ca04c5980
--- /dev/null
+++ b/drivers/phy/freescale/phy-fsl-imx8mq-dp.c
@@ -0,0 +1,726 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Cadence HDP-TX Display Port Interface (DP) PHY driver
+ *
+ * Copyright (C) 2022-2024 NXP Semiconductor, Inc.
+ */
+#include <asm/unaligned.h>
+#include <drm/bridge/cdns-mhdp-helper.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>
+
+#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_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_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_INIT_TMR 0x00e4
+#define CMN_TXPUCAL_ITER_TMR 0x00e5
+#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_INIT_TMR 0x010a
+#define CMN_TXPU_ADJ_ITER_TMR 0x010b
+#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_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 XCVR_DIAG_PLLDRC_CTRL 0x40e0
+#define XCVR_DIAG_PLLDRC_CTRL 0x40e0
+#define XCVR_DIAG_HSCLK_SEL 0x40e1
+#define XCVR_DIAG_LANE_FCM_EN_MGN_TMR 0x40f2
+#define TX_PSC_A0 0x4100
+#define TX_PSC_A1 0x4101
+#define TX_PSC_A2 0x4102
+#define TX_PSC_A3 0x4103
+#define TX_RCVDET_EN_TMR 0x4122
+#define TX_RCVDET_ST_TMR 0x4123
+#define TX_DIAG_BGREF_PREDRV_DELAY 0x41e7
+#define TX_DIAG_BGREF_PREDRV_DELAY 0x41e7
+#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 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 PHY_HDP_MODE_CTRL 0xc008
+#define PHY_HDP_CLK_CTL 0xc009
+#define PHY_PMA_CMN_CTRL1 0xc800
+
+/* PHY_PMA_CMN_CTRL1 */
+#define CMA_REF_CLK_SEL_MASK GENMASK(6, 4)
+#define CMA_REF_CLK_RCV_EN_MASK BIT(3)
+#define CMA_REF_CLK_RCV_EN 1
+
+/* PHY_HDP_CLK_CTL */
+#define PLL_DATA_RATE_CLK_DIV_MASK GENMASK(15, 8)
+#define PLL_DATA_RATE_CLK_DIV_HBR 0x24
+#define PLL_DATA_RATE_CLK_DIV_HBR2 0x12
+#define PLL_CLK_EN_ACK BIT(3)
+#define PLL_CLK_EN BIT(2)
+#define PLL_READY BIT(1)
+#define PLL_EN BIT(0)
+
+/* CMN_DIAG_HSCLK_SEL */
+#define HSCLK1_SEL_MASK GENMASK(5, 4)
+#define HSCLK0_SEL_MASK GENMASK(1, 0)
+#define HSCLK_PLL0_DIV2 1
+
+/* XCVR_DIAG_HSCLK_SEL */
+#define HSCLK_SEL_MODE3_MASK GENMASK(13, 12)
+#define HSCLK_SEL_MODE3_HSCLK1 1
+
+/* XCVR_DIAG_PLLDRC_CTRL */
+#define DPLL_CLK_SEL_MODE3 BIT(14)
+#define DPLL_DATA_RATE_DIV_MODE3_MASK GENMASK(13, 12)
+
+/* PHY_HDP_MODE_CTRL */
+#define POWER_STATE_A3_ACK BIT(7)
+#define POWER_STATE_A2_ACK BIT(6)
+#define POWER_STATE_A1_ACK BIT(5)
+#define POWER_STATE_A0_ACK BIT(4)
+#define POWER_STATE_A3 BIT(3)
+#define POWER_STATE_A2 BIT(2)
+#define POWER_STATE_A1 BIT(1)
+#define POWER_STATE_A0 BIT(0)
+
+#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,
+};
+
+#define MAX_LINK_RATE RATE_5_4
+
+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 {
+ struct cdns_mhdp_base base;
+
+ void __iomem *regs; /* DPTX registers base */
+ struct device *dev;
+ struct phy *phy;
+ struct mutex mbox_mutex; /* mutex to protect mailbox */
+ struct clk *ref_clk, *apb_clk;
+ u32 ref_clk_rate;
+ u32 num_lanes;
+ 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->base, 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->base, ADDR_PHY_AFE + (addr << 2), &reg32);
+ 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_clk_enable(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, "ref");
+ if (IS_ERR(cdns_phy->ref_clk)) {
+ dev_err(dev, "phy ref clock not found\n");
+ return PTR_ERR(cdns_phy->ref_clk);
+ }
+
+ cdns_phy->apb_clk = devm_clk_get(dev, "apb");
+ if (IS_ERR(cdns_phy->apb_clk)) {
+ dev_err(dev, "phy apb clock not found\n");
+ return PTR_ERR(cdns_phy->apb_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;
+ }
+
+ ret = clk_prepare_enable(cdns_phy->apb_clk);
+ if (ret) {
+ dev_err(cdns_phy->dev, "Failed to prepare apb clock\n");
+ goto err_ref_clk;
+ }
+
+ return 0;
+
+err_ref_clk:
+ clk_disable_unprepare(cdns_phy->ref_clk);
+ return -EINVAL;
+}
+
+static void hdptx_dp_clk_disable(struct cdns_hdptx_dp_phy *cdns_phy)
+{
+ clk_disable_unprepare(cdns_phy->ref_clk);
+ clk_disable_unprepare(cdns_phy->apb_clk);
+}
+
+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;
+
+ /* Enable PMA input ref clk(CMN_REF_CLK_RCV_EN) */
+ val = cdns_phy_reg_read(cdns_phy, PHY_PMA_CMN_CTRL1);
+ val &= ~CMA_REF_CLK_RCV_EN_MASK;
+ val |= FIELD_PREP(CMA_REF_CLK_RCV_EN_MASK, CMA_REF_CLK_RCV_EN);
+ 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 &= ~PLL_DATA_RATE_CLK_DIV_MASK;
+ if (link_rate <= RATE_2_7)
+ val |= FIELD_PREP(PLL_DATA_RATE_CLK_DIV_MASK,
+ PLL_DATA_RATE_CLK_DIV_HBR);
+ else
+ val |= FIELD_PREP(PLL_DATA_RATE_CLK_DIV_MASK,
+ PLL_DATA_RATE_CLK_DIV_HBR2);
+ 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 &= ~(HSCLK1_SEL_MASK | HSCLK0_SEL_MASK);
+ if (link_rate <= RATE_2_7) {
+ val |= FIELD_PREP(HSCLK1_SEL_MASK, HSCLK_PLL0_DIV2);
+ val |= FIELD_PREP(HSCLK0_SEL_MASK, HSCLK_PLL0_DIV2);
+ }
+ 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 &= ~HSCLK_SEL_MODE3_MASK;
+ if (link_rate <= RATE_2_7)
+ val |= FIELD_PREP(HSCLK_SEL_MODE3_MASK, HSCLK_SEL_MODE3_HSCLK1);
+ 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 &= ~(DPLL_DATA_RATE_DIV_MODE3_MASK | DPLL_CLK_SEL_MODE3);
+ if (link_rate <= RATE_2_7)
+ val |= FIELD_PREP(DPLL_DATA_RATE_DIV_MODE3_MASK, 2);
+ else
+ val |= FIELD_PREP(DPLL_DATA_RATE_DIV_MODE3_MASK, 1);
+ 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 &= ~CMA_REF_CLK_SEL_MASK;
+ /*
+ * 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 |= FIELD_PREP(CMA_REF_CLK_SEL_MASK, 3);
+ cdns_phy_reg_write(cdns_phy, PHY_PMA_CMN_CTRL1, val);
+}
+
+static int wait_for_ack(struct cdns_hdptx_dp_phy *cdns_phy, u32 reg, u32 mask,
+ const char *err_msg)
+{
+ u32 val, i;
+
+ for (i = 0; i < 10; i++) {
+ val = cdns_phy_reg_read(cdns_phy, reg);
+ if (val & mask)
+ return 0;
+ msleep(20);
+ }
+
+ dev_err(cdns_phy->dev, "%s\n", err_msg);
+ return -ETIMEDOUT;
+}
+
+static int wait_for_ack_clear(struct cdns_hdptx_dp_phy *cdns_phy, u32 reg, u32 mask,
+ const char *err_msg)
+{
+ u32 val, i;
+
+ for (i = 0; i < 10; i++) {
+ val = cdns_phy_reg_read(cdns_phy, reg);
+ if (!(val & mask))
+ return 0;
+ msleep(20);
+ }
+
+ dev_err(cdns_phy->dev, "%s\n", err_msg);
+ return -ETIMEDOUT;
+}
+
+static int hdptx_dp_phy_power_up(struct cdns_hdptx_dp_phy *cdns_phy)
+{
+ u32 val;
+ int ret = 0;
+
+ /* Enable HDP PLL’s for high speed clocks */
+ val = cdns_phy_reg_read(cdns_phy, PHY_HDP_CLK_CTL);
+ val |= PLL_EN;
+ cdns_phy_reg_write(cdns_phy, PHY_HDP_CLK_CTL, val);
+ ret = wait_for_ack(cdns_phy, PHY_HDP_CLK_CTL, PLL_READY,
+ "Wait PLL Ack failed");
+ if (ret < 0)
+ return ret;
+
+ /* 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 |= PLL_CLK_EN;
+ cdns_phy_reg_write(cdns_phy, PHY_HDP_CLK_CTL, val);
+ ret = wait_for_ack(cdns_phy, PHY_HDP_CLK_CTL, PLL_CLK_EN_ACK,
+ "Wait PLL clock enable ACK failed");
+ if (ret < 0)
+ return ret;
+
+ /* Configure PHY in A2 Mode */
+ cdns_phy_reg_write(cdns_phy, PHY_HDP_MODE_CTRL, POWER_STATE_A2);
+ ret = wait_for_ack(cdns_phy, PHY_HDP_MODE_CTRL, POWER_STATE_A2_ACK,
+ "Wait A2 Ack failed");
+ if (ret < 0)
+ return ret;
+
+ /* 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, POWER_STATE_A0);
+ ret = wait_for_ack(cdns_phy, PHY_HDP_MODE_CTRL, POWER_STATE_A0_ACK,
+ "Wait A0 Ack failed");
+ if (ret < 0)
+ return ret;
+
+ cdns_phy->power_up = true;
+
+ return ret;
+}
+
+static void hdptx_dp_phy_power_down(struct cdns_hdptx_dp_phy *cdns_phy)
+{
+ u16 val;
+
+ 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, POWER_STATE_A3);
+ if (wait_for_ack(cdns_phy, PHY_HDP_MODE_CTRL, POWER_STATE_A3_ACK,
+ "Wait A3 Ack failed"))
+ 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 &= ~PLL_CLK_EN;
+ cdns_phy_reg_write(cdns_phy, PHY_HDP_CLK_CTL, val);
+ if (wait_for_ack_clear(cdns_phy, PHY_HDP_CLK_CTL, PLL_CLK_EN_ACK,
+ "Wait PLL clock Ack clear failed"))
+ return;
+
+ /* Disable HDP PLL’s for high speed clocks */
+ val = cdns_phy_reg_read(cdns_phy, PHY_HDP_CLK_CTL);
+ val &= ~PLL_EN;
+ cdns_phy_reg_write(cdns_phy, PHY_HDP_CLK_CTL, val);
+ if (wait_for_ack_clear(cdns_phy, PHY_HDP_CLK_CTL, PLL_READY,
+ "Wait PLL Ack clear failed"))
+ return;
+
+ cdns_phy->power_up = false;
+}
+
+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;
+ cdns_phy->num_lanes = opts->dp.lanes;
+
+ if (cdns_phy->link_rate > MAX_LINK_RATE) {
+ dev_err(cdns_phy->dev, "Link Rate(%d) Not supported\n", cdns_phy->link_rate);
+ return false;
+ }
+
+ /* 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);
+
+ phy = devm_phy_create(dev, node, &cdns_hdptx_dp_phy_ops);
+ if (IS_ERR(phy))
+ return PTR_ERR(phy);
+
+ phy->attrs.mode = PHY_MODE_DP;
+ cdns_phy->phy = phy;
+ phy_set_drvdata(phy, cdns_phy);
+
+ /* init base struct for access mhdp mailbox */
+ cdns_phy->base.dev = cdns_phy->dev;
+ cdns_phy->base.regs = cdns_phy->regs;
+ cdns_phy->base.mbox_mutex = &cdns_phy->mbox_mutex;
+
+ ret = hdptx_dp_clk_enable(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;
+ }
+
+ return 0;
+
+clk_disable:
+ hdptx_dp_clk_disable(cdns_phy);
+
+ return -EINVAL;
+}
+
+static int cdns_hdptx_dp_phy_remove(struct platform_device *pdev)
+{
+ struct cdns_hdptx_dp_phy *cdns_phy = platform_get_drvdata(pdev);
+
+ hdptx_dp_clk_disable(cdns_phy);
+
+ return 0;
+}
+
+static const struct of_device_id cdns_hdptx_dp_phy_of_match[] = {
+ {.compatible = "fsl,imx8mq-dp-phy" },
+ { /* sentinel */ }
+};
+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@xxxxxxx>");
+MODULE_DESCRIPTION("Cadence HDP-TX DisplayPort PHY driver");
+MODULE_LICENSE("GPL");
--
2.34.1