[PATCH 2/2] display/drm/bridge: tc358775 DSI/LVDS driver

Vinay Simha BN
2020-03-11T09:51:02Z

dsi2lvds tc358775 bridge driver added
Tested in apq8016, ifc6309 board and panel
auo,b101xtn01

Signed-off-by: Vinay Simha BN <simhavcs@gmail.com>
---
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
---
drivers/gpu/drm/bridge/Kconfig | 10 +
drivers/gpu/drm/bridge/Makefile | 1 +
drivers/gpu/drm/bridge/tc358775.c | 688 ++++++++++++++++++++++++++++++++++++++
3 files changed, 699 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 8397bf7..d5528fa 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -133,6 +133,16 @@ config DRM_TOSHIBA_TC358767
---help---
Toshiba TC358767 eDP bridge chip driver.

+config DRM_TOSHIBA_TC358775
+ tristate "Toshiba TC358775 LVDS bridge"
+ depends on OF
+ select DRM_KMS_HELPER
+ select REGMAP_I2C
+ select DRM_PANEL
+ select DRM_MIPI_DSI
+ ---help---
+ Toshiba TC358775 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 1eb5376..9b2c512 100644
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_DRM_SII9234) += sii9234.o
obj-$(CONFIG_DRM_THINE_THC63LVD1024) += thc63lvd1024.o
obj-$(CONFIG_DRM_TOSHIBA_TC358764) += tc358764.o
obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o
+obj-$(CONFIG_DRM_TOSHIBA_TC358775) += tc358775.o
obj-$(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..28b828e
--- /dev/null
+++ b/drivers/gpu/drm/bridge/tc358775.c
@@ -0,0 +1,688 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * tc358775 DSI to LVDS bridge driver
+ *
+ * Copyright (C) 2020 InforceComputing
+ * Author: Vinay Simha BN <vinaysimha@inforcecomputing.com>
+ *
+ */
+#define DEBUG
+#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/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.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_MASK(start, end) (((1 << ((start) - (end) + 1)) - 1) << (end))
+#define FLD_VAL(val, start, end) (((val) << (end)) & FLD_MASK(start, end))
+
+/* 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_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_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 */
+
+/* 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 LVPHY1 0x04A4 /* LVDS PHY 1 */
+#define SYSSTAT 0x0500 /* System Status */
+#define SYSRST 0x0504 /* System Reset */
+/* 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 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 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;
+}
+
+static const char * const regulator_names[] = {
+ "vdd",
+ "vddio"
+};
+
+struct tc_data {
+ struct i2c_client *i2c;
+
+ struct device *dev;
+ struct regmap *regmap;
+
+ struct drm_bridge bridge;
+ struct drm_connector connector;
+ struct drm_panel *panel;
+
+ enum drm_connector_status status;
+ struct device_node *host_node;
+ struct mipi_dsi_device *dsi;
+ u8 num_dsi_lanes;
+
+ struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
+ struct gpio_desc *reset_gpio;
+ struct gpio_desc *stby_gpio;
+ u32 rev;
+ u8 dual_link; /* single-link or dual-link */
+};
+
+static inline struct tc_data *bridge_to_tc(struct drm_bridge *b)
+{
+ return container_of(b, struct tc_data, bridge);
+}
+
+static inline struct tc_data *connector_to_tc(struct drm_connector *c)
+{
+ return container_of(c, struct tc_data, connector);
+}
+
+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_bulk_enable(ARRAY_SIZE(tc->supplies), tc->supplies);
+ if (ret < 0) {
+ dev_err(dev, "regulator enable failed, %d\n", ret);
+ return;
+ }
+ usleep_range(10000, 20000);
+
+ gpiod_set_value(tc->stby_gpio, 0);
+ usleep_range(10, 20);
+
+ gpiod_set_value(tc->reset_gpio, 0);
+ usleep_range(10000, 20000);
+
+ drm_panel_prepare(tc->panel);
+}
+
+static void tc_bridge_disable(struct drm_bridge *bridge)
+{
+ struct tc_data *tc = bridge_to_tc(bridge);
+ struct device *dev = &tc->dsi->dev;
+ int ret;
+
+ ret = regulator_bulk_disable(ARRAY_SIZE(tc->supplies), tc->supplies);
+ if (ret < 0)
+ dev_err(dev, "regulator disable failed, %d\n", ret);
+ usleep_range(30000, 40000);
+
+ drm_panel_disable(tc->panel);
+}
+
+static void tc_bridge_post_disable(struct drm_bridge *bridge)
+{
+ struct tc_data *tc = bridge_to_tc(bridge);
+
+ gpiod_set_value(tc->stby_gpio, 1);
+ usleep_range(10, 20);
+
+ gpiod_set_value(tc->reset_gpio, 1);
+ usleep_range(10000, 20000);
+
+ drm_panel_unprepare(tc->panel);
+}
+
+static int d2l_write(struct tc_data *tc, u16 reg, u32 data)
+{
+ int ret = 0;
+
+ ret = regmap_bulk_write(tc->regmap, reg, (u32[]) {data}, 1);
+
+ return ret;
+}
+
+static void tc_bridge_enable(struct drm_bridge *bridge)
+{
+ struct tc_data *tc = bridge_to_tc(bridge);
+ int ret;
+ u32 hbpr, hpw, htime1, hfpr, hsize, htime2;
+ u32 vbpr, vpw, vtime1, vfpr, vsize, vtime2;
+ u32 val = 0;
+ u16 bus_formats;
+ struct drm_display_mode *mode;
+
+ mode = &bridge->encoder->crtc->state->adjusted_mode;
+
+ hbpr = 0;
+ hpw = mode->hsync_end - mode->hsync_start;
+ vbpr = 0;
+ vpw = mode->vsync_end - mode->vsync_start;
+
+ htime1 = (hbpr << 16) + hpw;
+ vtime1 = (vbpr << 16) + vpw;
+
+ hfpr = mode->hsync_start - mode->hdisplay;
+ hsize = mode->hdisplay;
+ vfpr = mode->vsync_start - mode->vdisplay;
+ vsize = mode->vdisplay;
+
+ htime2 = (hfpr << 16) + hsize;
+ vtime2 = (vfpr << 16) + vsize;
+
+ ret = regmap_read(tc->regmap, IDREG, &tc->rev);
+ if (ret) {
+ dev_err(tc->dev, "can not read device ID: %d\n", ret);
+ return;
+ }
+ dev_info(tc->dev, "DSI2LVDS Chip ID.%02x Revision ID. %02x\n",
+ (tc->rev>>8)&0xFF, (tc->rev)&0xFF);
+
+ d2l_write(tc, SYSRST, 0x000000FF);
+ usleep_range(30000, 40000);
+
+ d2l_write(tc, PPI_TX_RX_TA, TTA_GET | TTA_SURE);
+ d2l_write(tc, PPI_LPTXTIMECNT, LPX_PERIOD);
+ d2l_write(tc, PPI_D0S_CLRSIPOCOUNT, 3);
+ d2l_write(tc, PPI_D1S_CLRSIPOCOUNT, 3);
+ d2l_write(tc, PPI_D2S_CLRSIPOCOUNT, 3);
+ d2l_write(tc, PPI_D3S_CLRSIPOCOUNT, 3);
+
+ val = ((L0EN << tc->num_dsi_lanes) - L0EN) | DSI_CLEN_BIT;
+ d2l_write(tc, PPI_LANEENABLE, val);
+ d2l_write(tc, DSI_LANEENABLE, val);
+
+ d2l_write(tc, PPI_STARTPPI, 0x00000001);
+ d2l_write(tc, DSI_STARTDSI, 0x00000001);
+
+ val = TC358775_VPCTRL_VSDELAY(21); //TODO : to set the dynamic value
+
+ bus_formats = tc->connector.display_info.bus_formats[0];
+
+ if (bus_formats == MEDIA_BUS_FMT_RGB888_1X7X4_SPWG
+ || bus_formats == MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA) {
+ /* RGB888 */
+ val |= TC358775_VPCTRL_OPXLFMT(1);
+ d2l_write(tc, VPCTRL, val);
+ } else {
+ /* RGB666 */
+ val |= TC358775_VPCTRL_MSF(1);
+ d2l_write(tc, VPCTRL, val);
+ }
+
+ d2l_write(tc, HTIM1, htime1);
+ d2l_write(tc, VTIM1, vtime1);
+ d2l_write(tc, HTIM2, htime2);
+ d2l_write(tc, VTIM2, vtime2);
+
+ d2l_write(tc, VFUEN, 0x00000001);
+ d2l_write(tc, SYSRST, 0x00000004);
+ d2l_write(tc, LVPHY0, 0x00040006);
+
+ /* default jeida-24 */
+ if (bus_formats == MEDIA_BUS_FMT_RGB888_1X7X4_SPWG) {
+ /* vesa-24, TODO jeida-18*/
+ d2l_write(tc, LV_MX0003, LV_MX(LVI_R0, LVI_R1, LVI_R2, LVI_R3));
+ d2l_write(tc, LV_MX0407, LV_MX(LVI_R4, LVI_R7, LVI_R5, LVI_G0));
+ d2l_write(tc, LV_MX0811, LV_MX(LVI_G1, LVI_G2, LVI_G6, LVI_G7));
+ d2l_write(tc, LV_MX1215, LV_MX(LVI_G3, LVI_G4, LVI_G5, LVI_B0));
+ d2l_write(tc, LV_MX1619, LV_MX(LVI_B6, LVI_B7, LVI_B1, LVI_B2));
+ d2l_write(tc, LV_MX2023, LV_MX(LVI_B3, LVI_B4, LVI_B5, LVI_L0));
+ d2l_write(tc, LV_MX2427, LV_MX(LVI_HS, LVI_VS, LVI_DE, LVI_R6));
+ }
+
+ d2l_write(tc, VFUEN, 0x00000001);
+
+ val = TC358775_LVCFG_PCLKDIV(DIVIDE_BY_3) | LVCFG_LVEN_BIT;
+ if (tc->dual_link)
+ val |= TC358775_LVCFG_LVDLINK(1);
+
+ d2l_write(tc, LVCFG, val);
+
+ drm_panel_enable(tc->panel);
+}
+
+static int tc_connector_get_modes(struct drm_connector *connector)
+{
+ struct tc_data *tc = connector_to_tc(connector);
+ struct edid *edid;
+ unsigned int count;
+
+ if (tc->panel && tc->panel->funcs && tc->panel->funcs->get_modes) {
+ count = tc->panel->funcs->get_modes(tc->panel, connector);
+ if (count > 0)
+ return count;
+ }
+
+ edid = drm_get_edid(connector, tc->i2c->adapter);
+ if (!edid)
+ return 0;
+
+ drm_connector_update_edid_property(connector, edid);
+ count = drm_add_edid_modes(connector, edid);
+ kfree(edid);
+
+ return count;
+}
+
+static int tc_connector_mode_valid(struct drm_connector *connector,
+ struct drm_display_mode *mode)
+{
+ struct tc_data *tc = connector_to_tc(connector);
+
+ /* Maximum pixel clock speed 135MHz-single-link/270MHz-dual-link */
+ if ((mode->clock > 135000 && tc->dual_link == 0) ||
+ (mode->clock > 270000 && tc->dual_link == 1))
+ return MODE_CLOCK_HIGH;
+
+ return MODE_OK;
+}
+
+static struct drm_encoder *
+tc_connector_best_encoder(struct drm_connector *connector)
+{
+ struct tc_data *tc = connector_to_tc(connector);
+
+ return tc->bridge.encoder;
+}
+
+static const struct drm_connector_helper_funcs tc_connector_helper_funcs = {
+ .get_modes = tc_connector_get_modes,
+ .mode_valid = tc_connector_mode_valid,
+ .best_encoder = tc_connector_best_encoder,
+};
+
+static const struct drm_connector_funcs tc_connector_funcs = {
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .destroy = drm_connector_cleanup,
+ .reset = drm_atomic_helper_connector_reset,
+ .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+int tc358775_parse_dt(struct device_node *np, struct tc_data *tc)
+{
+ u32 num_lanes;
+ u8 dual_link;
+
+ of_property_read_u8(np, "tc,dual-link", &dual_link);
+ of_property_read_u32(np, "tc,dsi-lanes", &num_lanes);
+
+ if (num_lanes < 1 || num_lanes > 4)
+ return -EINVAL;
+
+ tc->num_dsi_lanes = num_lanes;
+ tc->dual_link = dual_link;
+
+ tc->host_node = of_graph_get_remote_node(np, 0, 0);
+ if (!tc->host_node)
+ return -ENODEV;
+
+ of_node_put(tc->host_node);
+
+ return 0;
+}
+
+int tc358775_attach_dsi(struct tc_data *tc)
+{
+ struct device *dev = &tc->i2c->dev;
+ struct mipi_dsi_host *host;
+ struct mipi_dsi_device *dsi;
+ int ret = 0;
+ 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;
+ }
+
+ return 0;
+
+err_dsi_attach:
+ mipi_dsi_device_unregister(dsi);
+err_dsi_device:
+ return ret;
+}
+
+static int tc_bridge_attach(struct drm_bridge *bridge)
+{
+ struct tc_data *tc = bridge_to_tc(bridge);
+ struct drm_device *drm = bridge->dev;
+ int ret;
+
+ /* Create LVDS connector */
+ drm_connector_helper_add(&tc->connector, &tc_connector_helper_funcs);
+ ret = drm_connector_init(drm, &tc->connector, &tc_connector_funcs,
+ DRM_MODE_CONNECTOR_LVDS);
+ if (ret)
+ return ret;
+
+ if (tc->panel)
+ drm_panel_attach(tc->panel, &tc->connector);
+
+ drm_connector_attach_encoder(&tc->connector, tc->bridge.encoder);
+
+ ret = tc358775_attach_dsi(tc);
+
+ 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,
+ .disable = tc_bridge_disable,
+ .post_disable = tc_bridge_post_disable,
+};
+
+static const struct regmap_config tc_regmap_config = {
+ .name = "tc358775",
+ .reg_bits = 16,
+ .val_bits = 32,
+ .reg_stride = 4,
+ .max_register = 0x05A8,
+ .cache_type = REGCACHE_RBTREE,
+ .reg_format_endian = REGMAP_ENDIAN_BIG,
+ .val_format_endian = REGMAP_ENDIAN_LITTLE,
+};
+
+static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+ struct device *dev = &client->dev;
+ struct tc_data *tc;
+ int ret;
+ unsigned int i;
+
+ tc = devm_kzalloc(dev, sizeof(*tc), GFP_KERNEL);
+ if (!tc)
+ return -ENOMEM;
+
+ tc->dev = dev;
+ tc->i2c = client;
+ tc->status = connector_status_connected;
+
+ /* port@1 is the output port */
+ ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &tc->panel, NULL);
+ if (ret && ret != -ENODEV)
+ return ret;
+
+ ret = tc358775_parse_dt(dev->of_node, tc);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < ARRAY_SIZE(tc->supplies); i++)
+ tc->supplies[i].supply = regulator_names[i];
+
+ ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(tc->supplies),
+ tc->supplies);
+ if (ret < 0)
+ dev_err(dev, "failed to init regulator, ret=%d\n", 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->regmap = devm_regmap_init_i2c(client, &tc_regmap_config);
+ if (IS_ERR(tc->regmap)) {
+ ret = PTR_ERR(tc->regmap);
+ dev_err(dev, "Failed to initialize regmap: %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 <vinaysimha@inforcecomputing.com>");
+MODULE_DESCRIPTION("tc358775 LVDS encoder driver");
+MODULE_LICENSE("GPL v2");
--
2.7.4