Add very basic driver for Toshiba TC358762 DSI-to-DPI bridge, derived from tc358764 driver and panel-raspberrypi-touchscreen. This driver is meant to replace the panel-raspberrypi-touchscreen too, as the bridge connection can be described in DT too.
Signed-off-by: Marek Vasut marex@denx.de To: dri-devel@lists.freedesktop.org Cc: Eric Anholt eric@anholt.net Cc: Rob Herring robh+dt@kernel.org Cc: Sam Ravnborg sam@ravnborg.org Cc: devicetree@vger.kernel.org Reviewed-by: Sam Ravnborg sam@ravnborg.org --- V2: Switch to DRM_PANEL_BRIDGE V3: No change --- drivers/gpu/drm/bridge/Kconfig | 8 + drivers/gpu/drm/bridge/Makefile | 1 + drivers/gpu/drm/bridge/tc358762.c | 280 ++++++++++++++++++++++++++++++ 3 files changed, 289 insertions(+) create mode 100644 drivers/gpu/drm/bridge/tc358762.c
diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig index 43271c21d3fc..58e879852082 100644 --- a/drivers/gpu/drm/bridge/Kconfig +++ b/drivers/gpu/drm/bridge/Kconfig @@ -153,6 +153,14 @@ config DRM_THINE_THC63LVD1024 help Thine THC63LVD1024 LVDS/parallel converter driver.
+config DRM_TOSHIBA_TC358762 + tristate "TC358762 DSI/DPI bridge" + depends on OF + select DRM_MIPI_DSI + select DRM_PANEL_BRIDGE + help + Toshiba TC358762 DSI/DPI bridge driver. + config DRM_TOSHIBA_TC358764 tristate "TC358764 DSI/LVDS bridge" depends on OF diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile index d63d4b7e4347..b341c60ee96a 100644 --- a/drivers/gpu/drm/bridge/Makefile +++ b/drivers/gpu/drm/bridge/Makefile @@ -12,6 +12,7 @@ obj-$(CONFIG_DRM_SII902X) += sii902x.o obj-$(CONFIG_DRM_SII9234) += sii9234.o obj-$(CONFIG_DRM_SIMPLE_BRIDGE) += simple-bridge.o obj-$(CONFIG_DRM_THINE_THC63LVD1024) += thc63lvd1024.o +obj-$(CONFIG_DRM_TOSHIBA_TC358762) += tc358762.o obj-$(CONFIG_DRM_TOSHIBA_TC358764) += tc358764.o obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o obj-$(CONFIG_DRM_TOSHIBA_TC358768) += tc358768.o diff --git a/drivers/gpu/drm/bridge/tc358762.c b/drivers/gpu/drm/bridge/tc358762.c new file mode 100644 index 000000000000..1bfdfc6affaf --- /dev/null +++ b/drivers/gpu/drm/bridge/tc358762.c @@ -0,0 +1,280 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2020 Marek Vasut marex@denx.de + * + * Based on tc358764.c by + * Andrzej Hajda a.hajda@samsung.com + * Maciej Purski m.purski@samsung.com + * + * Based on rpi_touchscreen.c by + * Eric Anholt eric@anholt.net + */ + +#include <linux/delay.h> +#include <linux/module.h> +#include <linux/of_graph.h> +#include <linux/regulator/consumer.h> + +#include <video/mipi_display.h> + +#include <drm/drm_atomic_helper.h> +#include <drm/drm_crtc.h> +#include <drm/drm_fb_helper.h> +#include <drm/drm_mipi_dsi.h> +#include <drm/drm_of.h> +#include <drm/drm_panel.h> +#include <drm/drm_print.h> +#include <drm/drm_probe_helper.h> + +/* PPI layer registers */ +#define PPI_STARTPPI 0x0104 /* START control bit */ +#define PPI_LPTXTIMECNT 0x0114 /* LPTX timing signal */ +#define PPI_D0S_ATMR 0x0144 +#define PPI_D1S_ATMR 0x0148 +#define PPI_D0S_CLRSIPOCOUNT 0x0164 /* Assertion timer for Lane 0 */ +#define PPI_D1S_CLRSIPOCOUNT 0x0168 /* Assertion timer for Lane 1 */ +#define PPI_START_FUNCTION 1 + +/* DSI layer registers */ +#define DSI_STARTDSI 0x0204 /* START control bit of DSI-TX */ +#define DSI_LANEENABLE 0x0210 /* Enables each lane */ +#define DSI_RX_START 1 + +/* LCDC/DPI Host Registers */ +#define LCDCTRL 0x0420 + +/* SPI Master Registers */ +#define SPICMR 0x0450 +#define SPITCR 0x0454 + +/* System Controller Registers */ +#define SYSCTRL 0x0464 + +/* System registers */ +#define LPX_PERIOD 3 + +/* Lane enable PPI and DSI register bits */ +#define LANEENABLE_CLEN BIT(0) +#define LANEENABLE_L0EN BIT(1) +#define LANEENABLE_L1EN BIT(2) + +struct tc358762 { + struct device *dev; + struct drm_bridge bridge; + struct drm_connector connector; + struct regulator *regulator; + struct drm_bridge *panel_bridge; + bool pre_enabled; + int error; +}; + +static int tc358762_clear_error(struct tc358762 *ctx) +{ + int ret = ctx->error; + + ctx->error = 0; + return ret; +} + +static void tc358762_write(struct tc358762 *ctx, u16 addr, u32 val) +{ + struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev); + ssize_t ret; + u8 data[6]; + + if (ctx->error) + return; + + data[0] = addr; + data[1] = addr >> 8; + data[2] = val; + data[3] = val >> 8; + data[4] = val >> 16; + data[5] = val >> 24; + + ret = mipi_dsi_generic_write(dsi, data, sizeof(data)); + if (ret < 0) + ctx->error = ret; +} + +static inline struct tc358762 *bridge_to_tc358762(struct drm_bridge *bridge) +{ + return container_of(bridge, struct tc358762, bridge); +} + +static int tc358762_init(struct tc358762 *ctx) +{ + tc358762_write(ctx, DSI_LANEENABLE, + LANEENABLE_L0EN | LANEENABLE_CLEN); + tc358762_write(ctx, PPI_D0S_CLRSIPOCOUNT, 5); + tc358762_write(ctx, PPI_D1S_CLRSIPOCOUNT, 5); + tc358762_write(ctx, PPI_D0S_ATMR, 0); + tc358762_write(ctx, PPI_D1S_ATMR, 0); + tc358762_write(ctx, PPI_LPTXTIMECNT, LPX_PERIOD); + + tc358762_write(ctx, SPICMR, 0x00); + tc358762_write(ctx, LCDCTRL, 0x00100150); + tc358762_write(ctx, SYSCTRL, 0x040f); + msleep(100); + + tc358762_write(ctx, PPI_STARTPPI, PPI_START_FUNCTION); + tc358762_write(ctx, DSI_STARTDSI, DSI_RX_START); + + msleep(100); + + return tc358762_clear_error(ctx); +} + +static void tc358762_post_disable(struct drm_bridge *bridge) +{ + struct tc358762 *ctx = bridge_to_tc358762(bridge); + int ret; + + /* + * The post_disable hook might be called multiple times. + * We want to avoid regulator imbalance below. + */ + if (!ctx->pre_enabled) + return; + + ctx->pre_enabled = false; + + ret = regulator_disable(ctx->regulator); + if (ret < 0) + dev_err(ctx->dev, "error disabling regulators (%d)\n", ret); +} + +static void tc358762_pre_enable(struct drm_bridge *bridge) +{ + struct tc358762 *ctx = bridge_to_tc358762(bridge); + int ret; + + ret = regulator_enable(ctx->regulator); + if (ret < 0) + dev_err(ctx->dev, "error enabling regulators (%d)\n", ret); + + ret = tc358762_init(ctx); + if (ret < 0) + dev_err(ctx->dev, "error initializing bridge (%d)\n", ret); + + ctx->pre_enabled = true; +} + +static int tc358762_attach(struct drm_bridge *bridge, + enum drm_bridge_attach_flags flags) +{ + struct tc358762 *ctx = bridge_to_tc358762(bridge); + + return drm_bridge_attach(bridge->encoder, ctx->panel_bridge, + bridge, flags); +} + +static const struct drm_bridge_funcs tc358762_bridge_funcs = { + .post_disable = tc358762_post_disable, + .pre_enable = tc358762_pre_enable, + .attach = tc358762_attach, +}; + +static int tc358762_parse_dt(struct tc358762 *ctx) +{ + struct drm_bridge *panel_bridge; + struct device *dev = ctx->dev; + struct drm_panel *panel; + int ret; + + ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, NULL); + if (ret) + return ret; + + panel_bridge = devm_drm_panel_bridge_add(dev, panel); + + if (IS_ERR(panel_bridge)) + return PTR_ERR(panel_bridge); + + ctx->panel_bridge = panel_bridge; + + return 0; +} + +static int tc358762_configure_regulators(struct tc358762 *ctx) +{ + ctx->regulator = devm_regulator_get(ctx->dev, "vddc"); + if (IS_ERR(ctx->regulator)) + return PTR_ERR(ctx->regulator); + + return 0; +} + +static int tc358762_probe(struct mipi_dsi_device *dsi) +{ + struct device *dev = &dsi->dev; + struct tc358762 *ctx; + int ret; + + ctx = devm_kzalloc(dev, sizeof(struct tc358762), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + mipi_dsi_set_drvdata(dsi, ctx); + + ctx->dev = dev; + ctx->pre_enabled = false; + + /* TODO: Find out how to get dual-lane mode working */ + dsi->lanes = 1; + dsi->format = MIPI_DSI_FMT_RGB888; + dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE | + MIPI_DSI_MODE_LPM; + + ret = tc358762_parse_dt(ctx); + if (ret < 0) + return ret; + + ret = tc358762_configure_regulators(ctx); + if (ret < 0) + return ret; + + ctx->bridge.funcs = &tc358762_bridge_funcs; + ctx->bridge.type = DRM_MODE_CONNECTOR_DPI; + ctx->bridge.of_node = dev->of_node; + + drm_bridge_add(&ctx->bridge); + + ret = mipi_dsi_attach(dsi); + if (ret < 0) { + drm_bridge_remove(&ctx->bridge); + dev_err(dev, "failed to attach dsi\n"); + } + + return ret; +} + +static int tc358762_remove(struct mipi_dsi_device *dsi) +{ + struct tc358762 *ctx = mipi_dsi_get_drvdata(dsi); + + mipi_dsi_detach(dsi); + drm_bridge_remove(&ctx->bridge); + + return 0; +} + +static const struct of_device_id tc358762_of_match[] = { + { .compatible = "toshiba,tc358762" }, + { } +}; +MODULE_DEVICE_TABLE(of, tc358762_of_match); + +static struct mipi_dsi_driver tc358762_driver = { + .probe = tc358762_probe, + .remove = tc358762_remove, + .driver = { + .name = "tc358762", + .of_match_table = tc358762_of_match, + }, +}; +module_mipi_dsi_driver(tc358762_driver); + +MODULE_AUTHOR("Marek Vasut marex@denx.de"); +MODULE_DESCRIPTION("MIPI-DSI based Driver for TC358762 DSI/DPI Bridge"); +MODULE_LICENSE("GPL v2");