Re: [PATCH v11 1/1] phy: phy-mtk-dp: Add driver for DP phy

From: Rex-BC Chen
Date: Fri Jun 17 2022 - 04:25:49 EST

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In reply to: Vinod Koul: "Re: [PATCH v11 1/1] phy: phy-mtk-dp: Add driver for DP phy"
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On Thu, 2022-06-16 at 17:47 -0700, Vinod Koul wrote:
> On 13-06-22, 15:26, Bo-Chen Chen wrote:
> > From: Markus Schneider-Pargmann <msp@xxxxxxxxxxxx>
> >
> > This is a new driver that supports the integrated DisplayPort phy
> > for
> > mediatek SoCs, especially the mt8195. The phy is integrated into
> > the
> > DisplayPort controller and will be created by the mtk-dp driver.
> > This
> > driver expects a struct regmap to be able to work on the same
> > registers
> > as the DisplayPort controller. It sets the device data to be the
> > struct
> > phy so that the DisplayPort controller can easily work with it.
> >
> > The driver does not have any devicetree bindings because the
> > datasheet
> > does not list the controller and the phy as distinct units.
> >
> > The interaction with the controller can be covered by the configure
> > callback of the phy framework and its displayport parameters.
> >
> > Signed-off-by: Markus Schneider-Pargmann <msp@xxxxxxxxxxxx>
> > Signed-off-by: Guillaume Ranquet <granquet@xxxxxxxxxxxx>
> > [Bo-Chen: Modify reviewers' comments.]
> > Signed-off-by: Bo-Chen Chen <rex-bc.chen@xxxxxxxxxxxx>
> > ---
> > MAINTAINERS | 1 +
> > drivers/phy/mediatek/Kconfig | 8 ++
> > drivers/phy/mediatek/Makefile | 1 +
> > drivers/phy/mediatek/phy-mtk-dp.c | 202
> > ++++++++++++++++++++++++++++++
> > 4 files changed, 212 insertions(+)
> > create mode 100644 drivers/phy/mediatek/phy-mtk-dp.c
> >
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index a6d3bd9d2a8d..f1460ee9ce83 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -6698,6 +6698,7 @@ L: linux-mediatek@xxxxxxxxxxxxxxxxxxx
> > (moderated for non-subscribers)
> > S: Supported
> > F: Documentation/devicetree/bindings/display/mediatek/
> > F: drivers/gpu/drm/mediatek/
> > +F: drivers/phy/mediatek/phy-mtk-dp.c
> > F: drivers/phy/mediatek/phy-mtk-hdmi*
> > F: drivers/phy/mediatek/phy-mtk-mipi*
> >
> > diff --git a/drivers/phy/mediatek/Kconfig
> > b/drivers/phy/mediatek/Kconfig
> > index 55f8e6c048ab..d631525d12e1 100644
> > --- a/drivers/phy/mediatek/Kconfig
> > +++ b/drivers/phy/mediatek/Kconfig
> > @@ -55,3 +55,11 @@ config PHY_MTK_MIPI_DSI
> > select GENERIC_PHY
> > help
> > Support MIPI DSI for Mediatek SoCs.
> > +
> > +config PHY_MTK_DP
> > + tristate "MediaTek DP-PHY Driver"
> > + depends on ARCH_MEDIATEK || COMPILE_TEST
> > + depends on OF
> > + select GENERIC_PHY
> > + help
> > + Support DisplayPort PHY for MediaTek SoCs.
> > diff --git a/drivers/phy/mediatek/Makefile
> > b/drivers/phy/mediatek/Makefile
> > index ace660fbed3a..4ba1e0650434 100644
> > --- a/drivers/phy/mediatek/Makefile
> > +++ b/drivers/phy/mediatek/Makefile
> > @@ -3,6 +3,7 @@
> > # Makefile for the phy drivers.
> > #
> >
> > +obj-$(CONFIG_PHY_MTK_DP) += phy-mtk-dp.o
> > obj-$(CONFIG_PHY_MTK_TPHY) += phy-mtk-tphy.o
> > obj-$(CONFIG_PHY_MTK_UFS) += phy-mtk-ufs.o
> > obj-$(CONFIG_PHY_MTK_XSPHY) += phy-mtk-xsphy.o
> > diff --git a/drivers/phy/mediatek/phy-mtk-dp.c
> > b/drivers/phy/mediatek/phy-mtk-dp.c
> > new file mode 100644
> > index 000000000000..c4d5ca1719a4
> > --- /dev/null
> > +++ b/drivers/phy/mediatek/phy-mtk-dp.c
> > @@ -0,0 +1,202 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * MediaTek DisplayPort PHY driver
> > + *
> > + * Copyright (c) 2022 BayLibre
> > + * Copyright (c) 2022 MediaTek
>
> It should be proper name of companies (hint see other uses)
>

Hello Vinod,

Thanks for review.
I will modify like this:
/*
* MediaTek DisplayPort PHY driver
*
* Copyright (c) 2022 BayLibre Inc.
* Copyright (c) 2022 MediaTek Inc.
*/
> > + */
> > +
> > +#include <linux/delay.h>
> > +#include <linux/io.h>
> > +#include <linux/mfd/syscon.h>
> > +#include <linux/of.h>
> > +#include <linux/phy/phy.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/regmap.h>
> > +
> > +#define PHY_OFFSET 0x1000
> > +
> > +#define MTK_DP_PHY_DIG_PLL_CTL_1 (PHY_OFFSET + 0x14)
> > +#define TPLL_SSC_EN BIT(3)
> > +
> > +#define MTK_DP_PHY_DIG_BIT_RATE (PHY_OFFSET + 0x3C)
> > +#define BIT_RATE_RBR 0
> > +#define BIT_RATE_HBR 1
> > +#define BIT_RATE_HBR2 2
> > +#define BIT_RATE_HBR3 3
> > +
> > +#define MTK_DP_PHY_DIG_SW_RST (PHY_OFFSET + 0x38)
> > +#define DP_GLB_SW_RST_PHYD BIT(0)
> > +
> > +#define MTK_DP_LANE0_DRIVING_PARAM_3 (PHY_OFFSET +
> > 0x138)
> > +#define MTK_DP_LANE1_DRIVING_PARAM_3 (PHY_OFFSET +
> > 0x238)
> > +#define MTK_DP_LANE2_DRIVING_PARAM_3 (PHY_OFFSET +
> > 0x338)
> > +#define MTK_DP_LANE3_DRIVING_PARAM_3 (PHY_OFFSET +
> > 0x438)
> > +#define XTP_LN_TX_LCTXC0_SW0_PRE0_DEFAULT BIT(4)
> > +#define XTP_LN_TX_LCTXC0_SW0_PRE1_DEFAULT (BIT(10) | BIT(12))
> > +#define XTP_LN_TX_LCTXC0_SW0_PRE2_DEFAULT GENMASK(20, 19)
> > +#define XTP_LN_TX_LCTXC0_SW0_PRE3_DEFAULT GENMASK(29, 29)
> > +#define DRIVING_PARAM_3_DEFAULT (XTP_LN_TX_LCTXC0_SW0_PRE0_DEFA
> > ULT | \
> > + XTP_LN_TX_LCTXC0_SW0_PRE1_DEFAULT | \
> > + XTP_LN_TX_LCTXC0_SW0_PRE2_DEFAULT | \
> > + XTP_LN_TX_LCTXC0_SW0_PRE3_DEFAULT)
> > +
> > +#define XTP_LN_TX_LCTXC0_SW1_PRE0_DEFAULT GENMASK(4, 3)
> > +#define XTP_LN_TX_LCTXC0_SW1_PRE1_DEFAULT GENMASK(12, 9)
> > +#define XTP_LN_TX_LCTXC0_SW1_PRE2_DEFAULT (BIT(18) | BIT(21))
> > +#define XTP_LN_TX_LCTXC0_SW2_PRE0_DEFAULT GENMASK(29, 29)
> > +#define DRIVING_PARAM_4_DEFAULT (XTP_LN_TX_LCTXC0_SW1_PRE0_DEFA
> > ULT | \
> > + XTP_LN_TX_LCTXC0_SW1_PRE1_DEFAULT | \
> > + XTP_LN_TX_LCTXC0_SW1_PRE2_DEFAULT | \
> > + XTP_LN_TX_LCTXC0_SW2_PRE0_DEFAULT)
> > +
> > +#define XTP_LN_TX_LCTXC0_SW2_PRE1_DEFAULT (BIT(3) | BIT(5))
> > +#define XTP_LN_TX_LCTXC0_SW3_PRE0_DEFAULT GENMASK(13, 12)
> > +#define DRIVING_PARAM_5_DEFAULT (XTP_LN_TX_LCTXC0_SW2_PRE1_DEFA
> > ULT | \
> > + XTP_LN_TX_LCTXC0_SW3_PRE0_DEFAULT)
> > +
> > +#define XTP_LN_TX_LCTXCP1_SW0_PRE0_DEFAULT 0
> > +#define XTP_LN_TX_LCTXCP1_SW0_PRE1_DEFAULT GENMASK(10, 10)
> > +#define XTP_LN_TX_LCTXCP1_SW0_PRE2_DEFAULT GENMASK(19, 19)
> > +#define XTP_LN_TX_LCTXCP1_SW0_PRE3_DEFAULT GENMASK(28, 28)
> > +#define DRIVING_PARAM_6_DEFAULT (XTP_LN_TX_LCTXCP1_SW0_PRE0_DEF
> > AULT | \
> > + XTP_LN_TX_LCTXCP1_SW0_PRE1_DEFAULT | \
> > + XTP_LN_TX_LCTXCP1_SW0_PRE2_DEFAULT | \
> > + XTP_LN_TX_LCTXCP1_SW0_PRE3_DEFAULT)
> > +
> > +#define XTP_LN_TX_LCTXCP1_SW1_PRE0_DEFAULT 0
> > +#define XTP_LN_TX_LCTXCP1_SW1_PRE1_DEFAULT GENMASK(10, 9)
> > +#define XTP_LN_TX_LCTXCP1_SW1_PRE2_DEFAULT GENMASK(19, 18)
> > +#define XTP_LN_TX_LCTXCP1_SW2_PRE0_DEFAULT 0
> > +#define DRIVING_PARAM_7_DEFAULT (XTP_LN_TX_LCTXCP1_SW1_PRE0_DEF
> > AULT | \
> > + XTP_LN_TX_LCTXCP1_SW1_PRE1_DEFAULT | \
> > + XTP_LN_TX_LCTXCP1_SW1_PRE2_DEFAULT | \
> > + XTP_LN_TX_LCTXCP1_SW2_PRE0_DEFAULT)
> > +
> > +#define XTP_LN_TX_LCTXCP1_SW2_PRE1_DEFAULT GENMASK(3, 3)
> > +#define XTP_LN_TX_LCTXCP1_SW3_PRE0_DEFAULT 0
> > +#define DRIVING_PARAM_8_DEFAULT (XTP_LN_TX_LCTXCP1_SW2_PRE1_DEF
> > AULT | \
> > + XTP_LN_TX_LCTXCP1_SW3_PRE0_DEFAULT)
> > +
> > +struct mtk_dp_phy {
> > + struct regmap *regs;
> > +};
> > +
> > +static int mtk_dp_phy_init(struct phy *phy)
> > +{
> > + struct mtk_dp_phy *dp_phy = phy_get_drvdata(phy);
> > + u32 driving_params[] = {
> > + DRIVING_PARAM_3_DEFAULT,
> > + DRIVING_PARAM_4_DEFAULT,
> > + DRIVING_PARAM_5_DEFAULT,
> > + DRIVING_PARAM_6_DEFAULT,
> > + DRIVING_PARAM_7_DEFAULT,
> > + DRIVING_PARAM_8_DEFAULT
> > + };
> > +
> > + regmap_bulk_write(dp_phy->regs, MTK_DP_LANE0_DRIVING_PARAM_3,
> > + driving_params, ARRAY_SIZE(driving_params));
> > + regmap_bulk_write(dp_phy->regs, MTK_DP_LANE1_DRIVING_PARAM_3,
> > + driving_params, ARRAY_SIZE(driving_params));
> > + regmap_bulk_write(dp_phy->regs, MTK_DP_LANE2_DRIVING_PARAM_3,
> > + driving_params, ARRAY_SIZE(driving_params));
> > + regmap_bulk_write(dp_phy->regs, MTK_DP_LANE3_DRIVING_PARAM_3,
> > + driving_params, ARRAY_SIZE(driving_params));
> > +
> > + return 0;
> > +}
> > +
> > +static int mtk_dp_phy_configure(struct phy *phy, union
> > phy_configure_opts *opts)
> > +{
> > + struct mtk_dp_phy *dp_phy = phy_get_drvdata(phy);
> > + u32 val;
> > +
> > + if (opts->dp.set_rate) {
> > + switch (opts->dp.link_rate) {
> > + default:
> > + dev_err(&phy->dev,
> > + "Implementation error, unknown linkrate
> > %x\n",
> > + opts->dp.link_rate);
> > + return -EINVAL;
> > + case 1620:
> > + val = BIT_RATE_RBR;
> > + break;
> > + case 2700:
> > + val = BIT_RATE_HBR;
> > + break;
> > + case 5400:
> > + val = BIT_RATE_HBR2;
> > + break;
> > + case 8100:
> > + val = BIT_RATE_HBR3;
> > + break;
> > + }
> > + regmap_write(dp_phy->regs, MTK_DP_PHY_DIG_BIT_RATE,
> > val);
> > + }
> > +
> > + regmap_update_bits(dp_phy->regs, MTK_DP_PHY_DIG_PLL_CTL_1,
> > + TPLL_SSC_EN, opts->dp.ssc ? TPLL_SSC_EN :
> > 0);
> > +
> > + return 0;
> > +}
> > +
> > +static int mtk_dp_phy_reset(struct phy *phy)
> > +{
> > + struct mtk_dp_phy *dp_phy = phy_get_drvdata(phy);
> > +
> > + regmap_update_bits(dp_phy->regs, MTK_DP_PHY_DIG_SW_RST,
> > + DP_GLB_SW_RST_PHYD, 0);
> > + usleep_range(50, 200);
> > + regmap_update_bits(dp_phy->regs, MTK_DP_PHY_DIG_SW_RST,
> > + DP_GLB_SW_RST_PHYD, 1);
> > +
> > + return 0;
> > +}
> > +
> > +static const struct phy_ops mtk_dp_phy_dev_ops = {
> > + .init = mtk_dp_phy_init,
> > + .configure = mtk_dp_phy_configure,
> > + .reset = mtk_dp_phy_reset,
> > + .owner = THIS_MODULE,
> > +};
> > +
> > +static int mtk_dp_phy_probe(struct platform_device *pdev)
> > +{
> > + struct device *dev = &pdev->dev;
> > + struct mtk_dp_phy *dp_phy;
> > + struct phy *phy;
> > + struct regmap *regs;
> > +
> > + regs = *(struct regmap **)dev->platform_data;
>
> why do you need this cast away from void?
>

When register platform data (in mtk_dp.c prober)
we do this where "struct regmap *regs;":

mtk_dp->phy_dev = platform_device_register_data(
dev, "mediatek-dp-phy",
PLATFORM_DEVID_AUTO, &mtk_dp->regs,
sizeof(struct regmap *));

refer to [1].

[1]:
https://lore.kernel.org/all/20220610105522.13449-6-rex-bc.chen@xxxxxxxxxxxx/

BRs,
Bo-Chen
> > + if (!regs)
> > + return dev_err_probe(dev, EINVAL,
> > + "No data passed, requires struct
> > regmap**\n");
> > +
> > + dp_phy = devm_kzalloc(dev, sizeof(*dp_phy), GFP_KERNEL);
> > + if (!dp_phy)
> > + return -ENOMEM;
> > +
> > + dp_phy->regs = regs;
> > + phy = devm_phy_create(dev, NULL, &mtk_dp_phy_dev_ops);
> > + if (IS_ERR(phy))
> > + return dev_err_probe(dev, PTR_ERR(phy),
> > + "Failed to create DP PHY\n");
> > +
> > + phy_set_drvdata(phy, dp_phy);
> > + if (!dev->of_node)
> > + phy_create_lookup(phy, "dp", dev_name(dev));
> > +
> > + return 0;
> > +}
> > +
> > +struct platform_driver mtk_dp_phy_driver = {
> > + .probe = mtk_dp_phy_probe,
> > + .driver = {
> > + .name = "mediatek-dp-phy",
> > + },
> > +};
> > +module_platform_driver(mtk_dp_phy_driver);
> > +
> > +MODULE_AUTHOR("Markus Schneider-Pargmann <msp@xxxxxxxxxxxx>");
> > +MODULE_DESCRIPTION("MediaTek DP PHY Driver");
> > +MODULE_LICENSE("GPL");
> > --
> > 2.18.0
>
>

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In reply to: Vinod Koul: "Re: [PATCH v11 1/1] phy: phy-mtk-dp: Add driver for DP phy"
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