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Message-ID: <PAXPR04MB9448F6A761B436849524E038F430A@PAXPR04MB9448.eurprd04.prod.outlook.com>
Date: Mon, 10 Jul 2023 07:30:12 +0000
From: Sandor Yu <sandor.yu@....com>
To: Vinod Koul <vkoul@...nel.org>
CC: "andrzej.hajda@...el.com" <andrzej.hajda@...el.com>,
"neil.armstrong@...aro.org" <neil.armstrong@...aro.org>,
"robert.foss@...aro.org" <robert.foss@...aro.org>,
"Laurent.pinchart@...asonboard.com"
<Laurent.pinchart@...asonboard.com>,
"jonas@...boo.se" <jonas@...boo.se>,
"jernej.skrabec@...il.com" <jernej.skrabec@...il.com>,
"airlied@...il.com" <airlied@...il.com>,
"daniel@...ll.ch" <daniel@...ll.ch>,
"robh+dt@...nel.org" <robh+dt@...nel.org>,
"krzysztof.kozlowski+dt@...aro.org"
<krzysztof.kozlowski+dt@...aro.org>,
"shawnguo@...nel.org" <shawnguo@...nel.org>,
"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
"festevam@...il.com" <festevam@...il.com>,
"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>,
"kernel@...gutronix.de" <kernel@...gutronix.de>,
dl-linux-imx <linux-imx@....com>,
Oliver Brown <oliver.brown@....com>
Subject: RE: [EXT] Re: [PATCH v6 7/8] phy: freescale: Add DisplayPort PHY
driver for i.MX8MQ
Hi Vinod,
Thanks for your comments,
> -----Original Message-----
> From: Vinod Koul <vkoul@...nel.org>
> Sent: 2023年6月21日 19:24
> To: Sandor Yu <sandor.yu@....com>
> Cc: andrzej.hajda@...el.com; neil.armstrong@...aro.org;
> robert.foss@...aro.org; Laurent.pinchart@...asonboard.com;
> jonas@...boo.se; jernej.skrabec@...il.com; airlied@...il.com;
> daniel@...ll.ch; robh+dt@...nel.org; krzysztof.kozlowski+dt@...aro.org;
> shawnguo@...nel.org; s.hauer@...gutronix.de; festevam@...il.com;
> 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; kernel@...gutronix.de; dl-linux-imx
> <linux-imx@....com>; Oliver Brown <oliver.brown@....com>
> Subject: [EXT] Re: [PATCH v6 7/8] phy: freescale: Add DisplayPort PHY driver
> for i.MX8MQ
>
> Caution: This is an external email. Please take care when clicking links or
> opening attachments. When in doubt, report the message using the 'Report
> this email' button
>
>
> On 15-06-23, 09:38, Sandor Yu wrote:
> > 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@....com>
> > ---
> > drivers/phy/freescale/Kconfig | 9 +
> > drivers/phy/freescale/Makefile | 1 +
> > drivers/phy/freescale/phy-fsl-imx8mq-dp.c | 697
> > ++++++++++++++++++++++
> > 3 files changed, 707 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 853958fb2c06..a99ee370eda6
> > 100644
> > --- a/drivers/phy/freescale/Kconfig
> > +++ b/drivers/phy/freescale/Kconfig
> > @@ -35,6 +35,15 @@ config PHY_FSL_IMX8M_PCIE
> > Enable this to add support for the PCIE PHY as found on
> > i.MX8M family of SOCs.
> >
> > +config PHY_CADENCE_DP_PHY
> > + tristate "Cadence HDPTX DP PHY support"
> > + depends on OF && HAS_IOMEM
> > + depends on COMMON_CLK
> > + select GENERIC_PHY
> > + help
> > + Enable this to support the Cadence HDPTX DP PHY driver
> > + on NXP's i.MX8MQ SOC.
> > +
> > endif
> >
> > config PHY_FSL_LYNX_28G
> > diff --git a/drivers/phy/freescale/Makefile
> > b/drivers/phy/freescale/Makefile index cedb328bc4d2..c3bdf3fa2e72
> > 100644
> > --- a/drivers/phy/freescale/Makefile
> > +++ b/drivers/phy/freescale/Makefile
> > @@ -4,3 +4,4 @@ obj-$(CONFIG_PHY_MIXEL_LVDS_PHY) +=
> phy-fsl-imx8qm-lvds-phy.o
> > obj-$(CONFIG_PHY_MIXEL_MIPI_DPHY) += phy-fsl-imx8-mipi-dphy.o
> > obj-$(CONFIG_PHY_FSL_IMX8M_PCIE) += phy-fsl-imx8m-pcie.o
> > obj-$(CONFIG_PHY_FSL_LYNX_28G) +=
> phy-fsl-lynx-28g.o
> > +obj-$(CONFIG_PHY_CADENCE_DP_PHY) += phy-fsl-imx8mq-dp.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 000000000000..2bd6772a5d3b
> > --- /dev/null
> > +++ b/drivers/phy/freescale/phy-fsl-imx8mq-dp.c
> > @@ -0,0 +1,697 @@
> > +// 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
>
> Is this always fixed for every phy generation?
Yes, the offset is fixed for every cdns hdmi/dp external phy.
> > +
> > +/* 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
>
> Lower case hex values please
OK, I will correct it.
>
> > +
> > +#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,
> > +};
> > +
> > +#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 }
>
> again, lower case please
OK, will change it in the next version.
>
> > +};
> > +
> > +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, *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, 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_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;
> > +
> > + 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;
> > + 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);
> > +
> > + 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@....com>");
> > +MODULE_DESCRIPTION("Cadence HDP-TX DisplayPort PHY driver");
> > +MODULE_LICENSE("GPL");
> > --
> > 2.34.1
>
> --
> ~Vinod
B.R
Sandor
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