Re: [PATCH v8 2/2] display/drm/bridge: TC358775 DSI/LVDS driver

From: Sam Ravnborg
Date: Mon Aug 10 2020 - 13:55:00 EST

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In reply to: Laurent Pinchart: "Re: [PATCH v8 2/2] display/drm/bridge: TC358775 DSI/LVDS driver"
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Hi Vinay.

Vinay - thanks for following carefully up on the review feedback.
I know it can be frustrating to wait for feedback.

On Sun, Aug 09, 2020 at 12:30:22AM +0300, Laurent Pinchart wrote:
> Hi Vinay,
>
> On Fri, Aug 07, 2020 at 06:22:59PM +0530, Vinay Simha B N wrote:
> > Hi All,
> >
> > Please Review the patch
>
> I'm afraid I won't have time for at least a couple of weeks.

I have read the full driver source again.
Nothing that prevented the patch to be applied jumped at me.
So it got my Reviewed-by: and I have applied this patch and the
bindings patch.

If Laurent or others identify further things to improve we can take
it in-tree.

Sam

>
> > On Wed, Jul 29, 2020 at 6:01 PM Vinay Simha B N <simhavcs@xxxxxxxxx> wrote:
> >
> > > Hi All,
> > >
> > > Please Review the patch
> > >
> > > On Fri, Jul 10, 2020 at 7:11 PM Vinay Simha BN <simhavcs@xxxxxxxxx> wrote:
> > >
> > >> This driver is tested with two panels individually with Apq8016-IFC6309
> > >> board
> > >>
> > >> https://www.inforcecomputing.com/products/single-board-computers-sbc/qualcomm-snapdragon-410-inforce-6309-micro-sbc
> > >>
> > >> 1. 1366x768@60 auo,b101xtn01 data-mapping = "jeida-24"
> > >> 2. 800x480@60 innolux,at070tn92 data-mapping = "vesa-24"
> > >>
> > >> - power off sequence in proper order
> > >> - put_unaligned_be16, put_unaligned_le32 macros used
> > >> - static function for mode_valid
> > >> - len initialized
> > >> - MODE_CLOCK_HIGH handled properly
> > >> - bus_formats handeld in mode_valid
> > >> - GENMASK and FIELD_PREP used
> > >> - Kconfig proper indentation
> > >> - error handling enpoint data-lanes
> > >> - check for bus_formats unsupported
> > >> - display_timings naming local variables
> > >> - help modified
> > >> - ~vsdelay dynamic value set based on the
> > >> calculation of dsi speed, output speed, blanking
> > >> - panel->connector_type removed
> > >> - dual port implemented
> > >> - devm_drm_panel_bridge_add method used instead of panel
> > >> description modified
> > >> - regulator enable and disable with proper orders and delays
> > >> as per the spec
> > >> - removed drm_connector_status
> > >> - added bus_formats
> > >> - mdelay to usleep_range
> > >> - magic number to macros for CLRSI and mux registers
> > >> description modified
> > >> - replaced u32 instead of uint32_t
> > >> - updated alphabetic order of headers
> > >> - added SPDX identifier license
> > >>
> > >> Signed-off-by: Vinay Simha BN <simhavcs@xxxxxxxxx>
> > >>
> > >> ---
> > >> v1:
> > >> Initial version
> > >>
> > >> v2:
> > >> * Andrzej Hajda review comments incorporated
> > >> SPDX identifier
> > >> development debug removed
> > >> alphabetic order headers
> > >> u32 instead of unit32_t
> > >> magic numbers to macros for CLRSI and mux registers
> > >> ignored return value
> > >>
> > >> * Laurent Pinchart review comments incorporated
> > >> mdelay to usleep_range
> > >> bus_formats added
> > >>
> > >> v3:
> > >> * Andrzej Hajda review comments incorporated
> > >> drm_connector_status removed
> > >> u32 rev removed and local variabl is used
> > >> regulator enable disable with proper orders and delays
> > >> as per the spec
> > >> devm_drm_panel_bridge_add method used instead of panel
> > >> description modified
> > >> dual port implemented
> > >>
> > >> v4:
> > >> * Sam Ravnborg review comments incorporated
> > >> panel->connector_type removed
> > >>
> > >> * Reported-by: kernel test robot <lkp@xxxxxxxxx>
> > >> parse_dt to static function
> > >> removed the if (endpoint), since data-lanes has to be
> > >> present for dsi dts ports
> > >>
> > >> v5:
> > >> ~vsdelay dynamic value set based on the
> > >> calculation of dsi speed, output speed, blanking
> > >>
> > >> v6:
> > >> * Sam Ravnborg review comments incorporated
> > >> help modified
> > >> display_timings naming local variables
> > >> check for bus_formats unsupported
> > >> error handling enpoint data-lanes
> > >>
> > >> v7:
> > >> * Sam Ravnborg review comments incorporated
> > >> Kconfig proper indentation
> > >> GENMASK and FIELD_PREP used
> > >> bus_formats handeld in mode_valid
> > >> MODE_CLOCK_HIGH handled properly
> > >>
> > >> * Reported-by: kernel test robot <lkp@xxxxxxxxx>
> > >> len initialized
> > >> static function for mode_valid
> > >>
> > >> v8:
> > >> * Andrzej Hajda review comments incorporated
> > >> power off sequence in proper order
> > >> put_unaligned_be16, put_unaligned_le32 macros used
> > >> * change log modified in reverse chronological order
> > >> ---
> > >> drivers/gpu/drm/bridge/Kconfig | 10 +
> > >> drivers/gpu/drm/bridge/Makefile | 1 +
> > >> drivers/gpu/drm/bridge/tc358775.c | 749
> > >> ++++++++++++++++++++++++++++++++++++++
> > >> 3 files changed, 760 insertions(+)
> > >> create mode 100644 drivers/gpu/drm/bridge/tc358775.c
> > >>
> > >> diff --git a/drivers/gpu/drm/bridge/Kconfig
> > >> b/drivers/gpu/drm/bridge/Kconfig
> > >> index 43271c2..25c3097 100644
> > >> --- a/drivers/gpu/drm/bridge/Kconfig
> > >> +++ b/drivers/gpu/drm/bridge/Kconfig
> > >> @@ -181,6 +181,16 @@ config DRM_TOSHIBA_TC358768
> > >> help
> > >> Toshiba TC358768AXBG/TC358778XBG DSI bridge chip driver.
> > >>
> > >> +config DRM_TOSHIBA_TC358775
> > >> + tristate "Toshiba TC358775 DSI/LVDS bridge"
> > >> + depends on OF
> > >> + select DRM_KMS_HELPER
> > >> + select REGMAP_I2C
> > >> + select DRM_PANEL
> > >> + select DRM_MIPI_DSI
> > >> + help
> > >> + Toshiba TC358775 DSI/LVDS bridge chip driver.
> > >> +
> > >> config DRM_TI_TFP410
> > >> tristate "TI TFP410 DVI/HDMI bridge"
> > >> depends on OF
> > >> diff --git a/drivers/gpu/drm/bridge/Makefile
> > >> b/drivers/gpu/drm/bridge/Makefile
> > >> index d63d4b7..23c770b 100644
> > >> --- a/drivers/gpu/drm/bridge/Makefile
> > >> +++ b/drivers/gpu/drm/bridge/Makefile
> > >> @@ -15,6 +15,7 @@ obj-$(CONFIG_DRM_THINE_THC63LVD1024) += thc63lvd1024.o
> > >> obj-$(CONFIG_DRM_TOSHIBA_TC358764) += tc358764.o
> > >> obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o
> > >> obj-$(CONFIG_DRM_TOSHIBA_TC358768) += tc358768.o
> > >> +obj-$(CONFIG_DRM_TOSHIBA_TC358775) += tc358775.o
> > >> obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/
> > >> obj-$(CONFIG_DRM_TI_SN65DSI86) += ti-sn65dsi86.o
> > >> obj-$(CONFIG_DRM_TI_TFP410) += ti-tfp410.o
> > >> diff --git a/drivers/gpu/drm/bridge/tc358775.c
> > >> b/drivers/gpu/drm/bridge/tc358775.c
> > >> new file mode 100644
> > >> index 0000000..7da15cd
> > >> --- /dev/null
> > >> +++ b/drivers/gpu/drm/bridge/tc358775.c
> > >> @@ -0,0 +1,749 @@
> > >> +// SPDX-License-Identifier: GPL-2.0
> > >> +/*
> > >> + * TC358775 DSI to LVDS bridge driver
> > >> + *
> > >> + * Copyright (C) 2020 SMART Wireless Computing
> > >> + * Author: Vinay Simha BN <simhavcs@xxxxxxxxx>
> > >> + *
> > >> + */
> > >> +/* #define DEBUG */
> > >> +#include <linux/bitfield.h>
> > >> +#include <linux/clk.h>
> > >> +#include <linux/device.h>
> > >> +#include <linux/gpio/consumer.h>
> > >> +#include <linux/i2c.h>
> > >> +#include <linux/kernel.h>
> > >> +#include <linux/module.h>
> > >> +#include <linux/regulator/consumer.h>
> > >> +#include <linux/slab.h>
> > >> +
> > >> +#include <asm/unaligned.h>
> > >> +
> > >> +#include <drm/drm_atomic_helper.h>
> > >> +#include <drm/drm_bridge.h>
> > >> +#include <drm/drm_crtc_helper.h>
> > >> +#include <drm/drm_dp_helper.h>
> > >> +#include <drm/drm_mipi_dsi.h>
> > >> +#include <drm/drm_of.h>
> > >> +#include <drm/drm_panel.h>
> > >> +#include <drm/drm_probe_helper.h>
> > >> +
> > >> +#define FLD_VAL(val, start, end) FIELD_PREP(GENMASK(start, end), val)
> > >> +
> > >> +/* Registers */
> > >> +
> > >> +/* DSI D-PHY Layer Registers */
> > >> +#define D0W_DPHYCONTTX 0x0004 /* Data Lane 0 DPHY Tx Control */
> > >> +#define CLW_DPHYCONTRX 0x0020 /* Clock Lane DPHY Rx Control */
> > >> +#define D0W_DPHYCONTRX 0x0024 /* Data Lane 0 DPHY Rx Control */
> > >> +#define D1W_DPHYCONTRX 0x0028 /* Data Lane 1 DPHY Rx Control */
> > >> +#define D2W_DPHYCONTRX 0x002C /* Data Lane 2 DPHY Rx Control */
> > >> +#define D3W_DPHYCONTRX 0x0030 /* Data Lane 3 DPHY Rx Control */
> > >> +#define COM_DPHYCONTRX 0x0038 /* DPHY Rx Common Control */
> > >> +#define CLW_CNTRL 0x0040 /* Clock Lane Control */
> > >> +#define D0W_CNTRL 0x0044 /* Data Lane 0 Control */
> > >> +#define D1W_CNTRL 0x0048 /* Data Lane 1 Control */
> > >> +#define D2W_CNTRL 0x004C /* Data Lane 2 Control */
> > >> +#define D3W_CNTRL 0x0050 /* Data Lane 3 Control */
> > >> +#define DFTMODE_CNTRL 0x0054 /* DFT Mode Control */
> > >> +
> > >> +/* DSI PPI Layer Registers */
> > >> +#define PPI_STARTPPI 0x0104 /* START control bit of PPI-TX function.
> > >> */
> > >> +#define PPI_START_FUNCTION 1
> > >> +
> > >> +#define PPI_BUSYPPI 0x0108
> > >> +#define PPI_LINEINITCNT 0x0110 /* Line Initialization Wait Counter */
> > >> +#define PPI_LPTXTIMECNT 0x0114
> > >> +#define PPI_LANEENABLE 0x0134 /* Enables each lane at the PPI layer. */
> > >> +#define PPI_TX_RX_TA 0x013C /* DSI Bus Turn Around timing parameters
> > >> */
> > >> +
> > >> +/* Analog timer function enable */
> > >> +#define PPI_CLS_ATMR 0x0140 /* Delay for Clock Lane in LPRX */
> > >> +#define PPI_D0S_ATMR 0x0144 /* Delay for Data Lane 0 in LPRX */
> > >> +#define PPI_D1S_ATMR 0x0148 /* Delay for Data Lane 1 in LPRX */
> > >> +#define PPI_D2S_ATMR 0x014C /* Delay for Data Lane 2 in LPRX */
> > >> +#define PPI_D3S_ATMR 0x0150 /* Delay for Data Lane 3 in LPRX */
> > >> +
> > >> +#define PPI_D0S_CLRSIPOCOUNT 0x0164 /* For lane 0 */
> > >> +#define PPI_D1S_CLRSIPOCOUNT 0x0168 /* For lane 1 */
> > >> +#define PPI_D2S_CLRSIPOCOUNT 0x016C /* For lane 2 */
> > >> +#define PPI_D3S_CLRSIPOCOUNT 0x0170 /* For lane 3 */
> > >> +
> > >> +#define CLS_PRE 0x0180 /* Digital Counter inside of PHY IO */
> > >> +#define D0S_PRE 0x0184 /* Digital Counter inside of PHY IO */
> > >> +#define D1S_PRE 0x0188 /* Digital Counter inside of PHY IO */
> > >> +#define D2S_PRE 0x018C /* Digital Counter inside of PHY IO */
> > >> +#define D3S_PRE 0x0190 /* Digital Counter inside of PHY IO */
> > >> +#define CLS_PREP 0x01A0 /* Digital Counter inside of PHY IO */
> > >> +#define D0S_PREP 0x01A4 /* Digital Counter inside of PHY IO */
> > >> +#define D1S_PREP 0x01A8 /* Digital Counter inside of PHY IO */
> > >> +#define D2S_PREP 0x01AC /* Digital Counter inside of PHY IO */
> > >> +#define D3S_PREP 0x01B0 /* Digital Counter inside of PHY IO */
> > >> +#define CLS_ZERO 0x01C0 /* Digital Counter inside of PHY IO */
> > >> +#define D0S_ZERO 0x01C4 /* Digital Counter inside of PHY IO */
> > >> +#define D1S_ZERO 0x01C8 /* Digital Counter inside of PHY IO */
> > >> +#define D2S_ZERO 0x01CC /* Digital Counter inside of PHY IO */
> > >> +#define D3S_ZERO 0x01D0 /* Digital Counter inside of PHY IO */
> > >> +
> > >> +#define PPI_CLRFLG 0x01E0 /* PRE Counters has reached set values */
> > >> +#define PPI_CLRSIPO 0x01E4 /* Clear SIPO values, Slave mode use
> > >> only. */
> > >> +#define HSTIMEOUT 0x01F0 /* HS Rx Time Out Counter */
> > >> +#define HSTIMEOUTENABLE 0x01F4 /* Enable HS Rx Time Out Counter */
> > >> +#define DSI_STARTDSI 0x0204 /* START control bit of DSI-TX function
> > >> */
> > >> +#define DSI_RX_START 1
> > >> +
> > >> +#define DSI_BUSYDSI 0x0208
> > >> +#define DSI_LANEENABLE 0x0210 /* Enables each lane at the Protocol
> > >> layer. */
> > >> +#define DSI_LANESTATUS0 0x0214 /* Displays lane is in HS RX mode. */
> > >> +#define DSI_LANESTATUS1 0x0218 /* Displays lane is in ULPS or STOP
> > >> state */
> > >> +
> > >> +#define DSI_INTSTATUS 0x0220 /* Interrupt Status */
> > >> +#define DSI_INTMASK 0x0224 /* Interrupt Mask */
> > >> +#define DSI_INTCLR 0x0228 /* Interrupt Clear */
> > >> +#define DSI_LPTXTO 0x0230 /* Low Power Tx Time Out Counter */
> > >> +
> > >> +#define DSIERRCNT 0x0300 /* DSI Error Count */
> > >> +#define APLCTRL 0x0400 /* Application Layer Control */
> > >> +#define RDPKTLN 0x0404 /* Command Read Packet Length */
> > >> +
> > >> +#define VPCTRL 0x0450 /* Video Path Control */
> > >> +#define HTIM1 0x0454 /* Horizontal Timing Control 1 */
> > >> +#define HTIM2 0x0458 /* Horizontal Timing Control 2 */
> > >> +#define VTIM1 0x045C /* Vertical Timing Control 1 */
> > >> +#define VTIM2 0x0460 /* Vertical Timing Control 2 */
> > >> +#define VFUEN 0x0464 /* Video Frame Timing Update Enable */
> > >> +#define VFUEN_EN BIT(0) /* Upload Enable */
> > >> +
> > >> +/* Mux Input Select for LVDS LINK Input */
> > >> +#define LV_MX0003 0x0480 /* Bit 0 to 3 */
> > >> +#define LV_MX0407 0x0484 /* Bit 4 to 7 */
> > >> +#define LV_MX0811 0x0488 /* Bit 8 to 11 */
> > >> +#define LV_MX1215 0x048C /* Bit 12 to 15 */
> > >> +#define LV_MX1619 0x0490 /* Bit 16 to 19 */
> > >> +#define LV_MX2023 0x0494 /* Bit 20 to 23 */
> > >> +#define LV_MX2427 0x0498 /* Bit 24 to 27 */
> > >> +#define LV_MX(b0, b1, b2, b3) (FLD_VAL(b0, 4, 0) | FLD_VAL(b1, 12, 8) |
> > >> \
> > >> + FLD_VAL(b2, 20, 16) | FLD_VAL(b3, 28, 24))
> > >> +
> > >> +/* Input bit numbers used in mux registers */
> > >> +enum {
> > >> + LVI_R0,
> > >> + LVI_R1,
> > >> + LVI_R2,
> > >> + LVI_R3,
> > >> + LVI_R4,
> > >> + LVI_R5,
> > >> + LVI_R6,
> > >> + LVI_R7,
> > >> + LVI_G0,
> > >> + LVI_G1,
> > >> + LVI_G2,
> > >> + LVI_G3,
> > >> + LVI_G4,
> > >> + LVI_G5,
> > >> + LVI_G6,
> > >> + LVI_G7,
> > >> + LVI_B0,
> > >> + LVI_B1,
> > >> + LVI_B2,
> > >> + LVI_B3,
> > >> + LVI_B4,
> > >> + LVI_B5,
> > >> + LVI_B6,
> > >> + LVI_B7,
> > >> + LVI_HS,
> > >> + LVI_VS,
> > >> + LVI_DE,
> > >> + LVI_L0
> > >> +};
> > >> +
> > >> +#define LVCFG 0x049C /* LVDS Configuration */
> > >> +#define LVPHY0 0x04A0 /* LVDS PHY 0 */
> > >> +#define LV_PHY0_RST(v) FLD_VAL(v, 22, 22) /* PHY reset */
> > >> +#define LV_PHY0_IS(v) FLD_VAL(v, 15, 14)
> > >> +#define LV_PHY0_ND(v) FLD_VAL(v, 4, 0) /* Frequency range
> > >> select */
> > >> +#define LV_PHY0_PRBS_ON(v) FLD_VAL(v, 20, 16) /* Clock/Data Flag
> > >> pins */
> > >> +
> > >> +#define LVPHY1 0x04A4 /* LVDS PHY 1 */
> > >> +#define SYSSTAT 0x0500 /* System Status */
> > >> +#define SYSRST 0x0504 /* System Reset */
> > >> +
> > >> +#define SYS_RST_I2CS BIT(0) /* Reset I2C-Slave controller */
> > >> +#define SYS_RST_I2CM BIT(1) /* Reset I2C-Master controller */
> > >> +#define SYS_RST_LCD BIT(2) /* Reset LCD controller */
> > >> +#define SYS_RST_BM BIT(3) /* Reset Bus Management controller */
> > >> +#define SYS_RST_DSIRX BIT(4) /* Reset DSI-RX and App controller */
> > >> +#define SYS_RST_REG BIT(5) /* Reset Register module */
> > >> +
> > >> +/* GPIO Registers */
> > >> +#define GPIOC 0x0520 /* GPIO Control */
> > >> +#define GPIOO 0x0524 /* GPIO Output */
> > >> +#define GPIOI 0x0528 /* GPIO Input */
> > >> +
> > >> +/* I2C Registers */
> > >> +#define I2CTIMCTRL 0x0540 /* I2C IF Timing and Enable Control */
> > >> +#define I2CMADDR 0x0544 /* I2C Master Addressing */
> > >> +#define WDATAQ 0x0548 /* Write Data Queue */
> > >> +#define RDATAQ 0x054C /* Read Data Queue */
> > >> +
> > >> +/* Chip ID and Revision ID Register */
> > >> +#define IDREG 0x0580
> > >> +
> > >> +#define LPX_PERIOD 4
> > >> +#define TTA_GET 0x40000
> > >> +#define TTA_SURE 6
> > >> +#define SINGLE_LINK 1
> > >> +#define DUAL_LINK 2
> > >> +
> > >> +#define TC358775XBG_ID 0x00007500
> > >> +
> > >> +/* Debug Registers */
> > >> +#define DEBUG00 0x05A0 /* Debug */
> > >> +#define DEBUG01 0x05A4 /* LVDS Data */
> > >> +
> > >> +#define DSI_CLEN_BIT BIT(0)
> > >> +#define DIVIDE_BY_3 3 /* PCLK=DCLK/3 */
> > >> +#define DIVIDE_BY_6 6 /* PCLK=DCLK/6 */
> > >> +#define LVCFG_LVEN_BIT BIT(0)
> > >> +
> > >> +#define L0EN BIT(1)
> > >> +
> > >> +#define TC358775_VPCTRL_VSDELAY__MASK 0x3FF00000
> > >> +#define TC358775_VPCTRL_VSDELAY__SHIFT 20
> > >> +static inline u32 TC358775_VPCTRL_VSDELAY(uint32_t val)
> > >> +{
> > >> + return ((val) << TC358775_VPCTRL_VSDELAY__SHIFT) &
> > >> + TC358775_VPCTRL_VSDELAY__MASK;
> > >> +}
> > >> +
> > >> +#define TC358775_VPCTRL_OPXLFMT__MASK 0x00000100
> > >> +#define TC358775_VPCTRL_OPXLFMT__SHIFT 8
> > >> +static inline u32 TC358775_VPCTRL_OPXLFMT(uint32_t val)
> > >> +{
> > >> + return ((val) << TC358775_VPCTRL_OPXLFMT__SHIFT) &
> > >> + TC358775_VPCTRL_OPXLFMT__MASK;
> > >> +}
> > >> +
> > >> +#define TC358775_VPCTRL_MSF__MASK 0x00000001
> > >> +#define TC358775_VPCTRL_MSF__SHIFT 0
> > >> +static inline u32 TC358775_VPCTRL_MSF(uint32_t val)
> > >> +{
> > >> + return ((val) << TC358775_VPCTRL_MSF__SHIFT) &
> > >> + TC358775_VPCTRL_MSF__MASK;
> > >> +}
> > >> +
> > >> +#define TC358775_LVCFG_PCLKDIV__MASK 0x000000f0
> > >> +#define TC358775_LVCFG_PCLKDIV__SHIFT 4
> > >> +static inline u32 TC358775_LVCFG_PCLKDIV(uint32_t val)
> > >> +{
> > >> + return ((val) << TC358775_LVCFG_PCLKDIV__SHIFT) &
> > >> + TC358775_LVCFG_PCLKDIV__MASK;
> > >> +}
> > >> +
> > >> +#define TC358775_LVCFG_LVDLINK__MASK 0x00000002
> > >> +#define TC358775_LVCFG_LVDLINK__SHIFT 0
> > >> +static inline u32 TC358775_LVCFG_LVDLINK(uint32_t val)
> > >> +{
> > >> + return ((val) << TC358775_LVCFG_LVDLINK__SHIFT) &
> > >> + TC358775_LVCFG_LVDLINK__MASK;
> > >> +}
> > >> +
> > >> +enum tc358775_ports {
> > >> + TC358775_DSI_IN,
> > >> + TC358775_LVDS_OUT0,
> > >> + TC358775_LVDS_OUT1,
> > >> +};
> > >> +
> > >> +struct tc_data {
> > >> + struct i2c_client *i2c;
> > >> + struct device *dev;
> > >> +
> > >> + struct drm_bridge bridge;
> > >> + struct drm_bridge *panel_bridge;
> > >> +
> > >> + struct device_node *host_node;
> > >> + struct mipi_dsi_device *dsi;
> > >> + u8 num_dsi_lanes;
> > >> +
> > >> + struct regulator *vdd;
> > >> + struct regulator *vddio;
> > >> + struct gpio_desc *reset_gpio;
> > >> + struct gpio_desc *stby_gpio;
> > >> + u8 lvds_link; /* single-link or dual-link */
> > >> + u8 bpc;
> > >> +};
> > >> +
> > >> +static inline struct tc_data *bridge_to_tc(struct drm_bridge *b)
> > >> +{
> > >> + return container_of(b, struct tc_data, bridge);
> > >> +}
> > >> +
> > >> +static void tc_bridge_pre_enable(struct drm_bridge *bridge)
> > >> +{
> > >> + struct tc_data *tc = bridge_to_tc(bridge);
> > >> + struct device *dev = &tc->dsi->dev;
> > >> + int ret;
> > >> +
> > >> + ret = regulator_enable(tc->vddio);
> > >> + if (ret < 0)
> > >> + dev_err(dev, "regulator vddio enable failed, %d\n", ret);
> > >> + usleep_range(10000, 11000);
> > >> +
> > >> + ret = regulator_enable(tc->vdd);
> > >> + if (ret < 0)
> > >> + dev_err(dev, "regulator vdd enable failed, %d\n", ret);
> > >> + usleep_range(10000, 11000);
> > >> +
> > >> + gpiod_set_value(tc->stby_gpio, 0);
> > >> + usleep_range(10000, 11000);
> > >> +
> > >> + gpiod_set_value(tc->reset_gpio, 0);
> > >> + usleep_range(10, 20);
> > >> +}
> > >> +
> > >> +static void tc_bridge_post_disable(struct drm_bridge *bridge)
> > >> +{
> > >> + struct tc_data *tc = bridge_to_tc(bridge);
> > >> + struct device *dev = &tc->dsi->dev;
> > >> + int ret;
> > >> +
> > >> + gpiod_set_value(tc->reset_gpio, 1);
> > >> + usleep_range(10, 20);
> > >> +
> > >> + gpiod_set_value(tc->stby_gpio, 1);
> > >> + usleep_range(10000, 11000);
> > >> +
> > >> + ret = regulator_disable(tc->vdd);
> > >> + if (ret < 0)
> > >> + dev_err(dev, "regulator vdd disable failed, %d\n", ret);
> > >> + usleep_range(10000, 11000);
> > >> +
> > >> + ret = regulator_disable(tc->vddio);
> > >> + if (ret < 0)
> > >> + dev_err(dev, "regulator vddio disable failed, %d\n", ret);
> > >> + usleep_range(10000, 11000);
> > >> +}
> > >> +
> > >> +static void d2l_read(struct i2c_client *i2c, u16 addr, u32 *val)
> > >> +{
> > >> + int ret;
> > >> + u8 buf_addr[2];
> > >> +
> > >> + put_unaligned_be16(addr, buf_addr);
> > >> + ret = i2c_master_send(i2c, buf_addr, sizeof(buf_addr));
> > >> + if (ret < 0)
> > >> + goto fail;
> > >> +
> > >> + ret = i2c_master_recv(i2c, (u8 *)val, sizeof(*val));
> > >> + if (ret < 0)
> > >> + goto fail;
> > >> +
> > >> + pr_debug("d2l: I2C : addr:%04x value:%08x\n", addr, *val);
> > >> +
> > >> +fail:
> > >> + dev_err(&i2c->dev, "Error %d reading from subaddress 0x%x\n",
> > >> + ret, addr);
> > >> +}
> > >> +
> > >> +static void d2l_write(struct i2c_client *i2c, u16 addr, u32 val)
> > >> +{
> > >> + u8 data[6];
> > >> + int ret;
> > >> +
> > >> + put_unaligned_be16(addr, data);
> > >> + put_unaligned_le32(val, data + 2);
> > >> +
> > >> + ret = i2c_master_send(i2c, data, ARRAY_SIZE(data));
> > >> + if (ret < 0)
> > >> + dev_err(&i2c->dev, "Error %d writing to subaddress
> > >> 0x%x\n",
> > >> + ret, addr);
> > >> +}
> > >> +
> > >> +/* helper function to access bus_formats */
> > >> +static struct drm_connector *get_connector(struct drm_encoder *encoder)
> > >> +{
> > >> + struct drm_device *dev = encoder->dev;
> > >> + struct drm_connector *connector;
> > >> +
> > >> + list_for_each_entry(connector, &dev->mode_config.connector_list,
> > >> head)
> > >> + if (connector->encoder == encoder)
> > >> + return connector;
> > >> +
> > >> + return NULL;
> > >> +}
> > >> +
> > >> +static void tc_bridge_enable(struct drm_bridge *bridge)
> > >> +{
> > >> + struct tc_data *tc = bridge_to_tc(bridge);
> > >> + u32 hback_porch, hsync_len, hfront_porch, hactive, htime1, htime2;
> > >> + u32 vback_porch, vsync_len, vfront_porch, vactive, vtime1, vtime2;
> > >> + u32 val = 0;
> > >> + u16 dsiclk, clkdiv, byteclk, t1, t2, t3, vsdelay;
> > >> + struct drm_display_mode *mode;
> > >> + struct drm_connector *connector = get_connector(bridge->encoder);
> > >> +
> > >> + mode = &bridge->encoder->crtc->state->adjusted_mode;
> > >> +
> > >> + hback_porch = mode->htotal - mode->hsync_end;
> > >> + hsync_len = mode->hsync_end - mode->hsync_start;
> > >> + vback_porch = mode->vtotal - mode->vsync_end;
> > >> + vsync_len = mode->vsync_end - mode->vsync_start;
> > >> +
> > >> + htime1 = (hback_porch << 16) + hsync_len;
> > >> + vtime1 = (vback_porch << 16) + vsync_len;
> > >> +
> > >> + hfront_porch = mode->hsync_start - mode->hdisplay;
> > >> + hactive = mode->hdisplay;
> > >> + vfront_porch = mode->vsync_start - mode->vdisplay;
> > >> + vactive = mode->vdisplay;
> > >> +
> > >> + htime2 = (hfront_porch << 16) + hactive;
> > >> + vtime2 = (vfront_porch << 16) + vactive;
> > >> +
> > >> + d2l_read(tc->i2c, IDREG, &val);
> > >> +
> > >> + dev_info(tc->dev, "DSI2LVDS Chip ID.%02x Revision ID. %02x **\n",
> > >> + (val >> 8) & 0xFF, val & 0xFF);
> > >> +
> > >> + d2l_write(tc->i2c, SYSRST, SYS_RST_REG | SYS_RST_DSIRX |
> > >> SYS_RST_BM |
> > >> + SYS_RST_LCD | SYS_RST_I2CM | SYS_RST_I2CS);
> > >> + usleep_range(30000, 40000);
> > >> +
> > >> + d2l_write(tc->i2c, PPI_TX_RX_TA, TTA_GET | TTA_SURE);
> > >> + d2l_write(tc->i2c, PPI_LPTXTIMECNT, LPX_PERIOD);
> > >> + d2l_write(tc->i2c, PPI_D0S_CLRSIPOCOUNT, 3);
> > >> + d2l_write(tc->i2c, PPI_D1S_CLRSIPOCOUNT, 3);
> > >> + d2l_write(tc->i2c, PPI_D2S_CLRSIPOCOUNT, 3);
> > >> + d2l_write(tc->i2c, PPI_D3S_CLRSIPOCOUNT, 3);
> > >> +
> > >> + val = ((L0EN << tc->num_dsi_lanes) - L0EN) | DSI_CLEN_BIT;
> > >> + d2l_write(tc->i2c, PPI_LANEENABLE, val);
> > >> + d2l_write(tc->i2c, DSI_LANEENABLE, val);
> > >> +
> > >> + d2l_write(tc->i2c, PPI_STARTPPI, PPI_START_FUNCTION);
> > >> + d2l_write(tc->i2c, DSI_STARTDSI, DSI_RX_START);
> > >> +
> > >> + if (tc->bpc == 8)
> > >> + val = TC358775_VPCTRL_OPXLFMT(1);
> > >> + else /* bpc = 6; */
> > >> + val = TC358775_VPCTRL_MSF(1);
> > >> +
> > >> + dsiclk = mode->crtc_clock * 3 * tc->bpc / tc->num_dsi_lanes /
> > >> 1000;
> > >> + clkdiv = dsiclk / DIVIDE_BY_3 * tc->lvds_link;
> > >> + byteclk = dsiclk / 4;
> > >> + t1 = hactive * (tc->bpc * 3 / 8) / tc->num_dsi_lanes;
> > >> + t2 = ((100000 / clkdiv)) * (hactive + hback_porch + hsync_len +
> > >> hfront_porch) / 1000;
> > >> + t3 = ((t2 * byteclk) / 100) - (hactive * (tc->bpc * 3 / 8) /
> > >> + tc->num_dsi_lanes);
> > >> +
> > >> + vsdelay = (clkdiv * (t1 + t3) / byteclk) - hback_porch -
> > >> hsync_len - hactive;
> > >> +
> > >> + val |= TC358775_VPCTRL_VSDELAY(vsdelay);
> > >> + d2l_write(tc->i2c, VPCTRL, val);
> > >> +
> > >> + d2l_write(tc->i2c, HTIM1, htime1);
> > >> + d2l_write(tc->i2c, VTIM1, vtime1);
> > >> + d2l_write(tc->i2c, HTIM2, htime2);
> > >> + d2l_write(tc->i2c, VTIM2, vtime2);
> > >> +
> > >> + d2l_write(tc->i2c, VFUEN, VFUEN_EN);
> > >> + d2l_write(tc->i2c, SYSRST, SYS_RST_LCD);
> > >> + d2l_write(tc->i2c, LVPHY0, LV_PHY0_PRBS_ON(4) | LV_PHY0_ND(6));
> > >> +
> > >> + dev_dbg(tc->dev, "bus_formats %04x bpc %d\n",
> > >> + connector->display_info.bus_formats[0],
> > >> + tc->bpc);
> > >> + /*
> > >> + * Default hardware register settings of tc358775 configured
> > >> + * with MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA jeida-24 format
> > >> + */
> > >> + if (connector->display_info.bus_formats[0] ==
> > >> + MEDIA_BUS_FMT_RGB888_1X7X4_SPWG) {
> > >> + /* VESA-24 */
> > >> + d2l_write(tc->i2c, LV_MX0003, LV_MX(LVI_R0, LVI_R1,
> > >> LVI_R2, LVI_R3));
> > >> + d2l_write(tc->i2c, LV_MX0407, LV_MX(LVI_R4, LVI_R7,
> > >> LVI_R5, LVI_G0));
> > >> + d2l_write(tc->i2c, LV_MX0811, LV_MX(LVI_G1, LVI_G2,
> > >> LVI_G6, LVI_G7));
> > >> + d2l_write(tc->i2c, LV_MX1215, LV_MX(LVI_G3, LVI_G4,
> > >> LVI_G5, LVI_B0));
> > >> + d2l_write(tc->i2c, LV_MX1619, LV_MX(LVI_B6, LVI_B7,
> > >> LVI_B1, LVI_B2));
> > >> + d2l_write(tc->i2c, LV_MX2023, LV_MX(LVI_B3, LVI_B4,
> > >> LVI_B5, LVI_L0));
> > >> + d2l_write(tc->i2c, LV_MX2427, LV_MX(LVI_HS, LVI_VS,
> > >> LVI_DE, LVI_R6));
> > >> + } else { /* MEDIA_BUS_FMT_RGB666_1X7X3_SPWG - JEIDA-18 */
> > >> + d2l_write(tc->i2c, LV_MX0003, LV_MX(LVI_R0, LVI_R1,
> > >> LVI_R2, LVI_R3));
> > >> + d2l_write(tc->i2c, LV_MX0407, LV_MX(LVI_R4, LVI_L0,
> > >> LVI_R5, LVI_G0));
> > >> + d2l_write(tc->i2c, LV_MX0811, LV_MX(LVI_G1, LVI_G2,
> > >> LVI_L0, LVI_L0));
> > >> + d2l_write(tc->i2c, LV_MX1215, LV_MX(LVI_G3, LVI_G4,
> > >> LVI_G5, LVI_B0));
> > >> + d2l_write(tc->i2c, LV_MX1619, LV_MX(LVI_L0, LVI_L0,
> > >> LVI_B1, LVI_B2));
> > >> + d2l_write(tc->i2c, LV_MX2023, LV_MX(LVI_B3, LVI_B4,
> > >> LVI_B5, LVI_L0));
> > >> + d2l_write(tc->i2c, LV_MX2427, LV_MX(LVI_HS, LVI_VS,
> > >> LVI_DE, LVI_L0));
> > >> + }
> > >> +
> > >> + d2l_write(tc->i2c, VFUEN, VFUEN_EN);
> > >> +
> > >> + val = LVCFG_LVEN_BIT;
> > >> + if (tc->lvds_link == DUAL_LINK) {
> > >> + val |= TC358775_LVCFG_LVDLINK(1);
> > >> + val |= TC358775_LVCFG_PCLKDIV(DIVIDE_BY_6);
> > >> + } else {
> > >> + val |= TC358775_LVCFG_PCLKDIV(DIVIDE_BY_3);
> > >> + };
> > >> + d2l_write(tc->i2c, LVCFG, val);
> > >> +}
> > >> +
> > >> +static enum drm_mode_status
> > >> +tc_mode_valid(struct drm_bridge *bridge,
> > >> + const struct drm_display_info *info,
> > >> + const struct drm_display_mode *mode)
> > >> +{
> > >> + struct tc_data *tc = bridge_to_tc(bridge);
> > >> +
> > >> + /*
> > >> + * Maximum pixel clock speed 135MHz for single-link
> > >> + * 270MHz for dual-link
> > >> + */
> > >> + if ((mode->clock > 135000 && tc->lvds_link == SINGLE_LINK) ||
> > >> + (mode->clock > 270000 && tc->lvds_link == DUAL_LINK))
> > >> + return MODE_CLOCK_HIGH;
> > >> +
> > >> + switch (info->bus_formats[0]) {
> > >> + case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
> > >> + case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
> > >> + /* RGB888 */
> > >> + tc->bpc = 8;
> > >> + break;
> > >> + case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
> > >> + /* RGB666 */
> > >> + tc->bpc = 6;
> > >> + break;
> > >> + default:
> > >> + dev_warn(tc->dev,
> > >> + "unsupported LVDS bus format 0x%04x\n",
> > >> + info->bus_formats[0]);
> > >> + return MODE_NOMODE;
> > >> + }
> > >> +
> > >> + return MODE_OK;
> > >> +}
> > >> +
> > >> +static int tc358775_parse_dt(struct device_node *np, struct tc_data *tc)
> > >> +{
> > >> + struct device_node *endpoint;
> > >> + struct device_node *parent;
> > >> + struct device_node *remote;
> > >> + struct property *prop;
> > >> + int len = 0;
> > >> +
> > >> + /*
> > >> + * To get the data-lanes of dsi, we need to access the dsi0_out
> > >> of port1
> > >> + * of dsi0 endpoint from bridge port0 of d2l_in
> > >> + */
> > >> + endpoint = of_graph_get_endpoint_by_regs(tc->dev->of_node,
> > >> + TC358775_DSI_IN, -1);
> > >> + if (endpoint) {
> > >> + /* dsi0_out node */
> > >> + parent = of_graph_get_remote_port_parent(endpoint);
> > >> + of_node_put(endpoint);
> > >> + if (parent) {
> > >> + /* dsi0 port 1 */
> > >> + endpoint = of_graph_get_endpoint_by_regs(parent,
> > >> 1, -1);
> > >> + of_node_put(parent);
> > >> + if (endpoint) {
> > >> + prop = of_find_property(endpoint,
> > >> "data-lanes",
> > >> + &len);
> > >> + of_node_put(endpoint);
> > >> + if (!prop) {
> > >> + dev_err(tc->dev,
> > >> + "failed to find data
> > >> lane\n");
> > >> + return -EPROBE_DEFER;
> > >> + }
> > >> + }
> > >> + }
> > >> + }
> > >> +
> > >> + tc->num_dsi_lanes = len / sizeof(u32);
> > >> +
> > >> + if (tc->num_dsi_lanes < 1 || tc->num_dsi_lanes > 4)
> > >> + return -EINVAL;
> > >> +
> > >> + tc->host_node = of_graph_get_remote_node(np, 0, 0);
> > >> + if (!tc->host_node)
> > >> + return -ENODEV;
> > >> +
> > >> + of_node_put(tc->host_node);
> > >> +
> > >> + tc->lvds_link = SINGLE_LINK;
> > >> + endpoint = of_graph_get_endpoint_by_regs(tc->dev->of_node,
> > >> + TC358775_LVDS_OUT1, -1);
> > >> + if (endpoint) {
> > >> + remote = of_graph_get_remote_port_parent(endpoint);
> > >> + of_node_put(endpoint);
> > >> +
> > >> + if (remote) {
> > >> + if (of_device_is_available(remote))
> > >> + tc->lvds_link = DUAL_LINK;
> > >> + of_node_put(remote);
> > >> + }
> > >> + }
> > >> +
> > >> + dev_dbg(tc->dev, "no.of dsi lanes: %d\n", tc->num_dsi_lanes);
> > >> + dev_dbg(tc->dev, "operating in %d-link mode\n", tc->lvds_link);
> > >> +
> > >> + return 0;
> > >> +}
> > >> +
> > >> +static int tc_bridge_attach(struct drm_bridge *bridge,
> > >> + enum drm_bridge_attach_flags flags)
> > >> +{
> > >> + struct tc_data *tc = bridge_to_tc(bridge);
> > >> + struct device *dev = &tc->i2c->dev;
> > >> + struct mipi_dsi_host *host;
> > >> + struct mipi_dsi_device *dsi;
> > >> + int ret;
> > >> +
> > >> + const struct mipi_dsi_device_info info = { .type = "tc358775",
> > >> + .channel = 0,
> > >> + .node = NULL,
> > >> + };
> > >> +
> > >> + host = of_find_mipi_dsi_host_by_node(tc->host_node);
> > >> + if (!host) {
> > >> + dev_err(dev, "failed to find dsi host\n");
> > >> + return -EPROBE_DEFER;
> > >> + }
> > >> +
> > >> + dsi = mipi_dsi_device_register_full(host, &info);
> > >> + if (IS_ERR(dsi)) {
> > >> + dev_err(dev, "failed to create dsi device\n");
> > >> + ret = PTR_ERR(dsi);
> > >> + goto err_dsi_device;
> > >> + }
> > >> +
> > >> + tc->dsi = dsi;
> > >> +
> > >> + dsi->lanes = tc->num_dsi_lanes;
> > >> + dsi->format = MIPI_DSI_FMT_RGB888;
> > >> + dsi->mode_flags = MIPI_DSI_MODE_VIDEO;
> > >> +
> > >> + ret = mipi_dsi_attach(dsi);
> > >> + if (ret < 0) {
> > >> + dev_err(dev, "failed to attach dsi to host\n");
> > >> + goto err_dsi_attach;
> > >> + }
> > >> +
> > >> + /* Attach the panel-bridge to the dsi bridge */
> > >> + return drm_bridge_attach(bridge->encoder, tc->panel_bridge,
> > >> + &tc->bridge, flags);
> > >> +err_dsi_attach:
> > >> + mipi_dsi_device_unregister(dsi);
> > >> +err_dsi_device:
> > >> + return ret;
> > >> +}
> > >> +
> > >> +static const struct drm_bridge_funcs tc_bridge_funcs = {
> > >> + .attach = tc_bridge_attach,
> > >> + .pre_enable = tc_bridge_pre_enable,
> > >> + .enable = tc_bridge_enable,
> > >> + .mode_valid = tc_mode_valid,
> > >> + .post_disable = tc_bridge_post_disable,
> > >> +};
> > >> +
> > >> +static int tc_probe(struct i2c_client *client, const struct
> > >> i2c_device_id *id)
> > >> +{
> > >> + struct device *dev = &client->dev;
> > >> + struct drm_panel *panel;
> > >> + struct tc_data *tc;
> > >> + int ret;
> > >> +
> > >> + tc = devm_kzalloc(dev, sizeof(*tc), GFP_KERNEL);
> > >> + if (!tc)
> > >> + return -ENOMEM;
> > >> +
> > >> + tc->dev = dev;
> > >> + tc->i2c = client;
> > >> +
> > >> + ret = drm_of_find_panel_or_bridge(dev->of_node,
> > >> TC358775_LVDS_OUT0,
> > >> + 0, &panel, NULL);
> > >> + if (ret < 0)
> > >> + return ret;
> > >> + if (!panel)
> > >> + return -ENODEV;
> > >> +
> > >> + tc->panel_bridge = devm_drm_panel_bridge_add(dev, panel);
> > >> + if (IS_ERR(tc->panel_bridge))
> > >> + return PTR_ERR(tc->panel_bridge);
> > >> +
> > >> + ret = tc358775_parse_dt(dev->of_node, tc);
> > >> + if (ret)
> > >> + return ret;
> > >> +
> > >> + tc->vddio = devm_regulator_get(dev, "vddio-supply");
> > >> + if (IS_ERR(tc->vddio)) {
> > >> + ret = PTR_ERR(tc->vddio);
> > >> + dev_err(dev, "vddio-supply not found\n");
> > >> + return ret;
> > >> + }
> > >> +
> > >> + tc->vdd = devm_regulator_get(dev, "vdd-supply");
> > >> + if (IS_ERR(tc->vdd)) {
> > >> + ret = PTR_ERR(tc->vddio);
> > >> + dev_err(dev, "vdd-supply not found\n");
> > >> + return ret;
> > >> + }
> > >> +
> > >> + tc->stby_gpio = devm_gpiod_get(dev, "stby", GPIOD_OUT_HIGH);
> > >> + if (IS_ERR(tc->stby_gpio)) {
> > >> + ret = PTR_ERR(tc->stby_gpio);
> > >> + dev_err(dev, "cannot get stby-gpio %d\n", ret);
> > >> + return ret;
> > >> + }
> > >> +
> > >> + tc->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> > >> + if (IS_ERR(tc->reset_gpio)) {
> > >> + ret = PTR_ERR(tc->reset_gpio);
> > >> + dev_err(dev, "cannot get reset-gpios %d\n", ret);
> > >> + return ret;
> > >> + }
> > >> +
> > >> + tc->bridge.funcs = &tc_bridge_funcs;
> > >> + tc->bridge.of_node = dev->of_node;
> > >> + drm_bridge_add(&tc->bridge);
> > >> +
> > >> + i2c_set_clientdata(client, tc);
> > >> +
> > >> + return 0;
> > >> +}
> > >> +
> > >> +static int tc_remove(struct i2c_client *client)
> > >> +{
> > >> + struct tc_data *tc = i2c_get_clientdata(client);
> > >> +
> > >> + drm_bridge_remove(&tc->bridge);
> > >> +
> > >> + return 0;
> > >> +}
> > >> +
> > >> +static const struct i2c_device_id tc358775_i2c_ids[] = {
> > >> + { "tc358775", 0 },
> > >> + { }
> > >> +};
> > >> +MODULE_DEVICE_TABLE(i2c, tc358775_i2c_ids);
> > >> +
> > >> +static const struct of_device_id tc358775_of_ids[] = {
> > >> + { .compatible = "toshiba,tc358775", },
> > >> + { }
> > >> +};
> > >> +MODULE_DEVICE_TABLE(of, tc358775_of_ids);
> > >> +
> > >> +static struct i2c_driver tc358775_driver = {
> > >> + .driver = {
> > >> + .name = "tc358775",
> > >> + .of_match_table = tc358775_of_ids,
> > >> + },
> > >> + .id_table = tc358775_i2c_ids,
> > >> + .probe = tc_probe,
> > >> + .remove = tc_remove,
> > >> +};
> > >> +module_i2c_driver(tc358775_driver);
> > >> +
> > >> +MODULE_AUTHOR("Vinay Simha BN <simhavcs@xxxxxxxxx>");
> > >> +MODULE_DESCRIPTION("TC358775 DSI/LVDS bridge driver");
> > >> +MODULE_LICENSE("GPL v2");
>
> --
> Regards,
>
> Laurent Pinchart
> _______________________________________________
> dri-devel mailing list
> dri-devel@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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