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Tue, 8 Dec 2020 10:04:57 +0000 Message-ID: <971966552900653b0d1714eb7d0ba17682b83780.camel@nxp.com> Subject: Re: [PATCH 4/4] phy: freescale: phy-fsl-imx8-mipi-dphy: Add i.MX8qxp LVDS PHY mode support From: Liu Ying To: Guido =?ISO-8859-1?Q?G=FCnther?= Cc: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, kishon@ti.com, vkoul@kernel.org, robh+dt@kernel.org, a.hajda@samsung.com, narmstrong@baylibre.com, Laurent.pinchart@ideasonboard.com, jonas@kwiboo.se, jernej.skrabec@siol.net, airlied@linux.ie, daniel@ffwll.ch, shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com, robert.chiras@nxp.com, martin.kepplinger@puri.sm Date: Tue, 08 Dec 2020 18:03:05 +0800 In-Reply-To: <20201208092440.GD20575@bogon.m.sigxcpu.org> References: <1607067224-15616-1-git-send-email-victor.liu@nxp.com> <1607067224-15616-5-git-send-email-victor.liu@nxp.com> <20201208092440.GD20575@bogon.m.sigxcpu.org> Content-Type: text/plain; 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The PHY mode is controlled > > by SCU firmware and the driver would call a SCU firmware function to > > configure the PHY mode. The single LVDS PHY has 4 data lanes to support > > a LVDS display. Also, with a master LVDS PHY and a slave LVDS PHY, they > > may work together to support a LVDS display with 8 data lanes(usually, dual > > LVDS link display). Note that this patch supports the LVDS PHY mode only > > for the i.MX8qxp Mixel combo PHY, i.e., the MIPI DPHY mode is yet to be > > supported, so for now error would be returned from ->set_mode() if MIPI > > DPHY mode is passed over to it for the combo PHY. > > > > Cc: Guido Günther > > Cc: Robert Chiras > > Cc: Kishon Vijay Abraham I > > Cc: Vinod Koul > > Cc: Shawn Guo > > Cc: Sascha Hauer > > Cc: Pengutronix Kernel Team > > Cc: Fabio Estevam > > Cc: NXP Linux Team > > Signed-off-by: Liu Ying > > --- > > drivers/phy/freescale/phy-fsl-imx8-mipi-dphy.c | 266 ++++++++++++++++++++++++- > > 1 file changed, 255 insertions(+), 11 deletions(-) > > > > diff --git a/drivers/phy/freescale/phy-fsl-imx8-mipi-dphy.c b/drivers/phy/freescale/phy-fsl-imx8-mipi-dphy.c > > index a95572b..37084a9 100644 > > --- a/drivers/phy/freescale/phy-fsl-imx8-mipi-dphy.c > > +++ b/drivers/phy/freescale/phy-fsl-imx8-mipi-dphy.c > > @@ -4,17 +4,31 @@ > > * Copyright 2019 Purism SPC > > */ > > > > +#include > > #include > > #include > > #include > > +#include > > +#include > > #include > > #include > > +#include > > #include > > #include > > #include > > #include > > #include > > #include > > +#include > > + > > +/* Control and Status Registers(CSR) */ > > +#define PHY_CTRL 0x00 > > +#define CCM_MASK GENMASK(7, 5) > > +#define CCM(n) FIELD_PREP(CCM_MASK, (n)) > > +#define CA_MASK GENMASK(4, 2) > > +#define CA(n) FIELD_PREP(CA_MASK, (n)) > > +#define RFB BIT(1) > > +#define LVDS_EN BIT(0) > > > > /* DPHY registers */ > > #define DPHY_PD_DPHY 0x00 > > @@ -55,8 +69,15 @@ > > #define PWR_ON 0 > > #define PWR_OFF 1 > > > > +#define MIN_VCO_FREQ 640000000 > > +#define MAX_VCO_FREQ 1500000000 > > + > > +#define MIN_LVDS_REFCLK_FREQ 24000000 > > +#define MAX_LVDS_REFCLK_FREQ 150000000 > > + > > enum mixel_dphy_devtype { > > MIXEL_IMX8MQ, > > + MIXEL_IMX8QXP, > > }; > > > > struct mixel_dphy_devdata { > > @@ -65,6 +86,7 @@ struct mixel_dphy_devdata { > > u8 reg_rxlprp; > > u8 reg_rxcdrp; > > u8 reg_rxhs_settle; > > + bool is_combo; /* MIPI DPHY and LVDS PHY combo */ > > }; > > > > static const struct mixel_dphy_devdata mixel_dphy_devdata[] = { > > @@ -74,6 +96,10 @@ static const struct mixel_dphy_devdata mixel_dphy_devdata[] = { > > .reg_rxlprp = 0x40, > > .reg_rxcdrp = 0x44, > > .reg_rxhs_settle = 0x48, > > + .is_combo = false, > > + }, > > + [MIXEL_IMX8QXP] = { > > + .is_combo = true, > > }, > > }; > > > > @@ -95,8 +121,12 @@ struct mixel_dphy_cfg { > > struct mixel_dphy_priv { > > struct mixel_dphy_cfg cfg; > > struct regmap *regmap; > > + struct regmap *lvds_regmap; > > struct clk *phy_ref_clk; > > const struct mixel_dphy_devdata *devdata; > > + struct imx_sc_ipc *ipc_handle; > > + bool is_slave; > > + int id; > > }; > > > > static const struct regmap_config mixel_dphy_regmap_config = { > > @@ -317,7 +347,8 @@ static int mixel_dphy_set_pll_params(struct phy *phy) > > return 0; > > } > > > > -static int mixel_dphy_configure(struct phy *phy, union phy_configure_opts *opts) > > +static int > > +mixel_dphy_configure_mipi_dphy(struct phy *phy, union phy_configure_opts *opts) > > { > > struct mixel_dphy_priv *priv = phy_get_drvdata(phy); > > struct mixel_dphy_cfg cfg = { 0 }; > > @@ -345,15 +376,118 @@ static int mixel_dphy_configure(struct phy *phy, union phy_configure_opts *opts) > > return 0; > > } > > > > +static int > > +mixel_dphy_configure_lvds_phy(struct phy *phy, union phy_configure_opts *opts) > > +{ > > + struct mixel_dphy_priv *priv = phy_get_drvdata(phy); > > + struct phy_configure_opts_lvds *lvds_opts = &opts->lvds; > > + unsigned long data_rate; > > + unsigned long fvco; > > + u32 rsc; > > + u32 co; > > + int ret; > > + > > + priv->is_slave = lvds_opts->is_slave; > > + > > + /* LVDS interface pins */ > > + regmap_write(priv->lvds_regmap, PHY_CTRL, CCM(0x5) | CA(0x4) | RFB); > > + > > + /* enable MODE8 only for slave LVDS PHY */ > > + rsc = priv->id ? IMX_SC_R_MIPI_1 : IMX_SC_R_MIPI_0; > > + ret = imx_sc_misc_set_control(priv->ipc_handle, rsc, IMX_SC_C_DUAL_MODE, > > + lvds_opts->is_slave); > > + if (ret) { > > + dev_err(&phy->dev, "Failed to configure MODE8: %d\n", ret); > > + return ret; > > + } > > + > > + /* > > + * Choose an appropriate divider ratio to meet the requirement of > > + * PLL VCO frequency range. > > + * > > + * ----- 640MHz ~ 1500MHz ------------ --------------- > > + * | VCO | ----------------> | CO divider | -> | LVDS data rate| > > + * ----- FVCO ------------ --------------- > > + * 1/2/4/8 div 7 * differential_clk_rate > > + */ > > + data_rate = 7 * lvds_opts->differential_clk_rate; > > + for (co = 1; co <= 8; co *= 2) { > > + fvco = data_rate * co; > > + > > + if (fvco >= MIN_VCO_FREQ) > > + break; > > + } > > + > > + if (fvco < MIN_VCO_FREQ || fvco > MAX_VCO_FREQ) { > > + dev_err(&phy->dev, "VCO frequency %lu is out of range\n", fvco); > > + return -ERANGE; > > + } > > + > > + /* > > + * CO is configurable, while CN and CM are not, > > + * as fixed ratios 1 and 7 are applied respectively. > > + */ > > + phy_write(phy, __ffs(co), DPHY_CO); > > + > > + /* set reference clock rate */ > > + clk_set_rate(priv->phy_ref_clk, lvds_opts->differential_clk_rate); > > + > > + return ret; > > +} > > + > > +static int mixel_dphy_configure(struct phy *phy, union phy_configure_opts *opts) > > +{ > > + if (phy->attrs.mode == PHY_MODE_MIPI_DPHY) > > + return mixel_dphy_configure_mipi_dphy(phy, opts); > > + else if (phy->attrs.mode == PHY_MODE_LVDS) > > + return mixel_dphy_configure_lvds_phy(phy, opts); > > + > > + dev_err(&phy->dev, "Failed to configure PHY with invalid PHY mode\n"); > > + return -EINVAL; > > +} > > + > > +static int > > +mixel_dphy_validate_lvds_phy(struct phy *phy, union phy_configure_opts *opts) > > +{ > > + struct phy_configure_opts_lvds *lvds_cfg = &opts->lvds; > > + > > + if (lvds_cfg->bits_per_lane_and_dclk_cycle != 7) { > > + dev_err(&phy->dev, "Invalid bits per LVDS data lane: %u\n", > > + lvds_cfg->bits_per_lane_and_dclk_cycle); > > + return -EINVAL; > > + } > > + > > + if (lvds_cfg->lanes != 4) { > > + dev_err(&phy->dev, "Invalid LVDS data lanes: %u\n", > > + lvds_cfg->lanes); > > + return -EINVAL; > > + } > > + > > + if (lvds_cfg->differential_clk_rate < MIN_LVDS_REFCLK_FREQ || > > + lvds_cfg->differential_clk_rate > MAX_LVDS_REFCLK_FREQ) { > > + dev_err(&phy->dev, > > + "Invalid LVDS differential clock rate: %lu\n", > > + lvds_cfg->differential_clk_rate); > > + return -EINVAL; > > + } > > + > > + return 0; > > +} > > + > > static int mixel_dphy_validate(struct phy *phy, enum phy_mode mode, int submode, > > union phy_configure_opts *opts) > > { > > - struct mixel_dphy_cfg cfg = { 0 }; > > + if (mode == PHY_MODE_MIPI_DPHY) { > > + struct mixel_dphy_cfg mipi_dphy_cfg = { 0 }; > > > > - if (mode != PHY_MODE_MIPI_DPHY) > > - return -EINVAL; > > + return mixel_dphy_config_from_opts(phy, &opts->mipi_dphy, > > + &mipi_dphy_cfg); > > + } else if (mode == PHY_MODE_LVDS) { > > + return mixel_dphy_validate_lvds_phy(phy, opts); > > + } > > > > - return mixel_dphy_config_from_opts(phy, &opts->mipi_dphy, &cfg); > > + dev_err(&phy->dev, "Failed to validate PHY with invalid PHY mode\n"); > > Can you print the `mode` here so it becomes obvious from the error what > incorrect mode got passed in? Will do in the next version. > > > + return -EINVAL; > > } > > > > static int mixel_dphy_init(struct phy *phy) > > @@ -373,27 +507,74 @@ static int mixel_dphy_exit(struct phy *phy) > > return 0; > > } > > > > -static int mixel_dphy_power_on(struct phy *phy) > > +static int mixel_dphy_power_on_mipi_dphy(struct phy *phy) > > { > > struct mixel_dphy_priv *priv = phy_get_drvdata(phy); > > u32 locked; > > int ret; > > > > - ret = clk_prepare_enable(priv->phy_ref_clk); > > - if (ret < 0) > > - return ret; > > - > > phy_write(phy, PWR_ON, DPHY_PD_PLL); > > ret = regmap_read_poll_timeout(priv->regmap, DPHY_LOCK, locked, > > locked, PLL_LOCK_SLEEP, > > PLL_LOCK_TIMEOUT); > > if (ret < 0) { > > dev_err(&phy->dev, "Could not get DPHY lock (%d)!\n", ret); > > - goto clock_disable; > > + return ret; > > } > > phy_write(phy, PWR_ON, DPHY_PD_DPHY); > > > > return 0; > > +} > > + > > +static int mixel_dphy_power_on_lvds_phy(struct phy *phy) > > +{ > > + struct mixel_dphy_priv *priv = phy_get_drvdata(phy); > > + u32 locked; > > + int ret; > > + > > + regmap_update_bits(priv->lvds_regmap, PHY_CTRL, LVDS_EN, LVDS_EN); > > + > > + phy_write(phy, PWR_ON, DPHY_PD_DPHY); > > + phy_write(phy, PWR_ON, DPHY_PD_PLL); > > + > > + /* do not wait for slave LVDS PHY being locked */ > > + if (priv->is_slave) > > + return 0; > > + > > + ret = regmap_read_poll_timeout(priv->regmap, DPHY_LOCK, locked, > > + locked, PLL_LOCK_SLEEP, > > + PLL_LOCK_TIMEOUT); > > + if (ret < 0) { > > + dev_err(&phy->dev, "Could not get LVDS PHY lock (%d)!\n", ret); > > + return ret; > > + } > > + > > + return 0; > > +} > > + > > +static int mixel_dphy_power_on(struct phy *phy) > > +{ > > + struct mixel_dphy_priv *priv = phy_get_drvdata(phy); > > + int ret; > > + > > + ret = clk_prepare_enable(priv->phy_ref_clk); > > + if (ret < 0) > > + return ret; > > + > > + if (phy->attrs.mode == PHY_MODE_MIPI_DPHY) { > > + ret = mixel_dphy_power_on_mipi_dphy(phy); > > + } else if (phy->attrs.mode == PHY_MODE_LVDS) { > > + ret = mixel_dphy_power_on_lvds_phy(phy); > > + } else { > > + dev_err(&phy->dev, > > + "Failed to power on PHY with invalid PHY mode\n"); > > Can you print the `mode` here so it becomes obvious from the error what > incorrect mode got passed in? Will do in the next version. > > > + ret = -EINVAL; > > + } > > + > > + if (ret) > > + goto clock_disable; > > + > > + return 0; > > clock_disable: > > clk_disable_unprepare(priv->phy_ref_clk); > > return ret; > > @@ -406,16 +587,52 @@ static int mixel_dphy_power_off(struct phy *phy) > > phy_write(phy, PWR_OFF, DPHY_PD_PLL); > > phy_write(phy, PWR_OFF, DPHY_PD_DPHY); > > > > + if (phy->attrs.mode == PHY_MODE_LVDS) > > + regmap_update_bits(priv->lvds_regmap, PHY_CTRL, LVDS_EN, 0); > > + > > clk_disable_unprepare(priv->phy_ref_clk); > > > > return 0; > > } > > > > +static int mixel_dphy_set_mode(struct phy *phy, enum phy_mode mode, int submode) > > +{ > > + struct mixel_dphy_priv *priv = phy_get_drvdata(phy); > > + int ret; > > + > > I'd reject all modes except PHY_MODE_MIPI_DPHY and PHY_MODE_MIPI_LVDS upfront... It seems that this overall rejection would cause _double_ check together with the snippet right below, which should be avoided. > > > + /* Currently, MIPI DPHY mode only, if it's not a combo PHY. */ > > + if (!priv->devdata->is_combo && mode != PHY_MODE_MIPI_DPHY) { > > + dev_err(&phy->dev, "Failed to set PHY mode to MIPI DPHY\n"); > > + return -EINVAL; > > + } > > + > > + if (priv->devdata->is_combo && mode != PHY_MODE_LVDS) { > > + dev_err(&phy->dev, "Failed to set PHY mode for combo PHY\n"); > > + return -EINVAL; > > + } > > ...and then just reject on whetehr `is_combo` is set or not. This makes > it easier to add more later. The above snippet is rejecting on whether 'is_combo' is set or not. So, in short, the current implementation looks ok to me. Or, things still can be improved here? Thanks, Liu Ying > > > + if (priv->devdata->is_combo) { > > + u32 rsc = priv->id ? IMX_SC_R_MIPI_1 : IMX_SC_R_MIPI_0; > > + > > + ret = imx_sc_misc_set_control(priv->ipc_handle, > > + rsc, IMX_SC_C_MODE, > > + mode == PHY_MODE_LVDS); > > + if (ret) { > > + dev_err(&phy->dev, > > + "Failed to set PHY mode via SCU ipc: %d\n", ret); > > + return ret; > > + } > > + } > > + > > + return 0; > > +} > > + > > static const struct phy_ops mixel_dphy_phy_ops = { > > .init = mixel_dphy_init, > > .exit = mixel_dphy_exit, > > .power_on = mixel_dphy_power_on, > > .power_off = mixel_dphy_power_off, > > + .set_mode = mixel_dphy_set_mode, > > .configure = mixel_dphy_configure, > > .validate = mixel_dphy_validate, > > .owner = THIS_MODULE, > > @@ -424,6 +641,8 @@ static const struct phy_ops mixel_dphy_phy_ops = { > > static const struct of_device_id mixel_dphy_of_match[] = { > > { .compatible = "fsl,imx8mq-mipi-dphy", > > .data = &mixel_dphy_devdata[MIXEL_IMX8MQ] }, > > + { .compatible = "fsl,imx8qxp-mipi-dphy", > > + .data = &mixel_dphy_devdata[MIXEL_IMX8QXP] }, > > { /* sentinel */ }, > > }; > > MODULE_DEVICE_TABLE(of, mixel_dphy_of_match); > > @@ -436,6 +655,7 @@ static int mixel_dphy_probe(struct platform_device *pdev) > > struct mixel_dphy_priv *priv; > > struct phy *phy; > > void __iomem *base; > > + int ret; > > > > if (!np) > > return -ENODEV; > > @@ -467,6 +687,30 @@ static int mixel_dphy_probe(struct platform_device *pdev) > > dev_dbg(dev, "phy_ref clock rate: %lu\n", > > clk_get_rate(priv->phy_ref_clk)); > > > > + if (priv->devdata->is_combo) { > > + priv->lvds_regmap = > > + syscon_regmap_lookup_by_phandle(np, "fsl,syscon"); > > + if (IS_ERR(priv->lvds_regmap)) { > > + ret = PTR_ERR(priv->lvds_regmap); > > + dev_err_probe(dev, ret, "Failed to get LVDS regmap\n"); > > + return ret; > > + } > > + > > + priv->id = of_alias_get_id(np, "mipi_dphy"); > > + if (priv->id < 0) { > > + dev_err(dev, "Failed to get phy node alias id: %d\n", > > + priv->id); > > + return priv->id; > > + } > > + > > + ret = imx_scu_get_handle(&priv->ipc_handle); > > + if (ret) { > > + dev_err_probe(dev, ret, > > + "Failed to get SCU ipc handle\n"); > > + return ret; > > + } > > + } > > + > > dev_set_drvdata(dev, priv); > > > > phy = devm_phy_create(dev, np, &mixel_dphy_phy_ops); > > -- > > 2.7.4 > > > > Cheers, > -- Guido From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,MSGID_FROM_MTA_HEADER,SPF_HELO_NONE, SPF_PASS,UNWANTED_LANGUAGE_BODY,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 97E82C4361B for ; Tue, 8 Dec 2020 10:06:34 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher 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