Hi Jagan, Thank you for the patch. On Wed, Feb 03, 2021 at 12:42:56PM +0530, Jagan Teki wrote: > SN65DSI84 is a Single Channel DSI to Dual-link LVDS bridge from > Texas Instruments. > > SN65DSI83, SN65DSI85 are variants of the same family of bridge > controllers. > > Right now the bridge driver is supporting a single link, dual-link > support requires to initiate I2C Channel B registers. MArek Vasut (on CC) has very recently posted a driver for the SN65DSI86. Should the two drivers be merged together ? > Tested with STM32MP1 MIPI DSI host design configuration. > > Signed-off-by: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx> > --- > Changes for v2: > - dropped the mdelays between commands as delays in init script in > datasheet is based Aardvark I2C host adaptor. > https://e2e.ti.com/support/interface/f/138/t/974276 > > MAINTAINERS | 6 + > drivers/gpu/drm/bridge/Kconfig | 19 ++ > drivers/gpu/drm/bridge/Makefile | 1 + > drivers/gpu/drm/bridge/ti-sn65dsi84.c | 457 ++++++++++++++++++++++++++ > 4 files changed, 483 insertions(+) > create mode 100644 drivers/gpu/drm/bridge/ti-sn65dsi84.c > > diff --git a/MAINTAINERS b/MAINTAINERS > index 12dd1fff2a39..44750ff7640c 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -5984,6 +5984,12 @@ S: Maintained > F: Documentation/devicetree/bindings/display/ti/ > F: drivers/gpu/drm/omapdrm/ > > +DRM DRIVERS FOR TI SN65DSI84 DSI TO LVDS BRIDGE > +M: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx> > +S: Maintained > +F: Documentation/devicetree/bindings/display/bridge/ti,sn65dsi84.yaml > +F: drivers/gpu/drm/bridge/ti-sn65dsi84.c > + > DRM DRIVERS FOR V3D > M: Eric Anholt <eric@xxxxxxxxxx> > S: Supported > diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig > index e4110d6ca7b3..6494881bffb3 100644 > --- a/drivers/gpu/drm/bridge/Kconfig > +++ b/drivers/gpu/drm/bridge/Kconfig > @@ -232,6 +232,25 @@ config DRM_TI_TFP410 > help > Texas Instruments TFP410 DVI/HDMI Transmitter driver > > +config DRM_TI_SN65DSI84 > + tristate "TI SN65DSI84 DSI to LVDS bridge" > + depends on OF > + select DRM_KMS_HELPER > + select REGMAP_I2C > + select DRM_PANEL > + select DRM_MIPI_DSI > + help > + Texas Instruments SN65DSI84 Single Channel DSI to Dual-link LVDS > + bridge driver. > + > + Bridge decodes MIPI DSI 18bpp RGB666 and 240bpp RG888 packets and > + converts the formatted video data stream to a FlatLink compatible > + LVDS output operating at pixel clocks operating from 25 MHx to > + 154 MHz. > + > + SN65DSI84 offers a Dual-Link LVDS, Single-Link LVDS interface with > + four data lanes per link. > + > config DRM_TI_SN65DSI86 > tristate "TI SN65DSI86 DSI to eDP bridge" > depends on OF > diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile > index 86e7acc76f8d..3906052ef639 100644 > --- a/drivers/gpu/drm/bridge/Makefile > +++ b/drivers/gpu/drm/bridge/Makefile > @@ -20,6 +20,7 @@ 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-$(CONFIG_DRM_TI_SN65DSI84) += ti-sn65dsi84.o > obj-$(CONFIG_DRM_TI_SN65DSI86) += ti-sn65dsi86.o > obj-$(CONFIG_DRM_TI_TFP410) += ti-tfp410.o > obj-$(CONFIG_DRM_TI_TPD12S015) += ti-tpd12s015.o > diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi84.c b/drivers/gpu/drm/bridge/ti-sn65dsi84.c > new file mode 100644 > index 000000000000..27a9074db17e > --- /dev/null > +++ b/drivers/gpu/drm/bridge/ti-sn65dsi84.c > @@ -0,0 +1,457 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (c) 2021 Engicam srl > + * Copyright (C) 2021 Amarula Solutions(India) > + * Author: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx> > + */ > + > +#include <drm/drm_of.h> > +#include <drm/drm_panel.h> > +#include <drm/drm_print.h> > +#include <drm/drm_mipi_dsi.h> > + > +#include <linux/delay.h> > +#include <linux/gpio/consumer.h> > +#include <linux/i2c.h> > +#include <linux/module.h> > +#include <linux/regmap.h> > + > +/* sn65dsi84 registers */ > +#define SN65DSI_SOFT_RESET 0x09 > +#define SN65DSI_LVDS_CLK 0x0a > +#define SN65DSI_CLK_DIV 0x0b > +#define SN65DSI_CLK_PLL 0x0d > +#define SN65DSI_DSI_CFG 0x10 > +#define SN65DSI_DSI_CLK_EQ 0x11 > +#define SN65DSI_DSI_CLK_RANGE 0x12 > +#define SN65DSI_LVDS_MODE 0x18 > +#define SN65DSI_CHA_LINE_LO 0x20 > +#define SN65DSI_CHA_LINE_HI 0x21 > +#define SN65DSI_CHA_VIRT_LO 0x24 > +#define SN65DSI_CHA_VIRT_HI 0x25 > +#define SN65DSI_CHA_SYNC_DELAY_LO 0x28 > +#define SN65DSI_CHA_SYNC_DELAY_HI 0x29 > +#define SN65DSI_CHA_HSYNC_WIDTH_LO 0x2c > +#define SN65DSI_CHA_HSYNC_WIDTH_HI 0x2d > +#define SN65DSI_CHA_VSYNC_WIDTH_LO 0x30 > +#define SN65DSI_CHA_VSYNC_WIDTH_HI 0x31 > +#define SN65DSI_CHA_HBACK_PORCH 0x34 > +#define SN65DSI_CHA_VBACK_PORCH 0x36 > +#define SN65DSI_CHA_HFRONT_PORCH 0x38 > +#define SN65DSI_CHA_VFRONT_PORCH 0x3a > +#define SN65DSI_CHA_ERR 0xe5 > + > +/* sn65dsi register bits */ > +#define SN65DSI_RESET_EN BIT(0) > +#define SN65DSI_PLL_EN BIT(0) > +#define SN65DSI_LVDS_CLK_MASK GENMASK(3, 1) > +#define SN65DSI_LVDS_CLK_SHIFT 1 > +#define SN65DSI_LVDS_CLK_SRC_DSI BIT(0) > +#define SN65DSI_CLK_DIV_MASK GENMASK(7, 3) > +#define SN65DSI_CLK_DIV_SHIFT 3 > +#define SN65DSI_DSI_LANE_MASK GENMASK(4, 3) > +#define SN65DSI_DSI_LANE_SHIFT 3 > +#define SN65DSI_LVDS_LINK_CFG BIT(4) > +#define SN65DSI_LVDS_CHA_24BPP BIT(3) > +#define SN65DSI_CHA_LOW_SYNC_DELAY 0x20 > +#define SN65DSI_CHA_HIGH_SYNC_DELAY 0x00 > + > +struct sn65dsi { > + struct device *dev; > + struct drm_bridge bridge; > + struct drm_bridge *panel_bridge; > + > + struct device_node *host_node; > + struct mipi_dsi_device *dsi; > + u8 dsi_lanes; > + > + struct regmap *regmap; > + struct gpio_desc *enable; > +}; > + > +static const struct regmap_config sn65dsi_regmap_config = { > + .reg_bits = 8, > + .val_bits = 8, > + .max_register = SN65DSI_CHA_ERR, > + .name = "sn65dsi", > + .cache_type = REGCACHE_RBTREE, > +}; > + > +static inline struct sn65dsi *bridge_to_sn65dsi(struct drm_bridge *bridge) > +{ > + return container_of(bridge, struct sn65dsi, bridge); > +} > + > +static struct drm_display_mode *bridge_to_mode(struct drm_bridge *bridge) > +{ > + return &bridge->encoder->crtc->state->mode; > +} > + > +static void sn65dsi_setup_channels(struct sn65dsi *sn, > + struct drm_display_mode *mode) > +{ > + u32 hsync_len, hfront_porch, hback_porch; > + u32 vsync_len, vfront_porch, vback_porch; > + > + hfront_porch = mode->hsync_start - mode->hdisplay; > + hsync_len = mode->hsync_end - mode->hsync_start; > + hback_porch = mode->htotal - mode->hsync_end; > + > + vfront_porch = mode->vsync_start - mode->vdisplay; > + vsync_len = mode->vsync_end - mode->vsync_start; > + vback_porch = mode->vtotal - mode->vsync_end; > + > + /* cha, lower 8-bits of hdisplay */ > + regmap_write(sn->regmap, SN65DSI_CHA_LINE_LO, mode->hdisplay & 0xff); > + > + /* cha, upper 4-bits of hdisplay */ > + regmap_write(sn->regmap, SN65DSI_CHA_LINE_HI, (mode->hdisplay >> 8) & 0xff); > + > + /* cha, lower 8-bits of vdisplay */ > + regmap_write(sn->regmap, SN65DSI_CHA_VIRT_LO, mode->vdisplay & 0xff); > + > + /* cha, upper 4-bits of vdisplay */ > + regmap_write(sn->regmap, SN65DSI_CHA_VIRT_HI, (mode->vdisplay >> 8) & 0xff); > + > + /*cha, lower sync delay */ > + regmap_write(sn->regmap, SN65DSI_CHA_SYNC_DELAY_LO, SN65DSI_CHA_LOW_SYNC_DELAY); > + > + /*cha, upper sync delay */ > + regmap_write(sn->regmap, SN65DSI_CHA_SYNC_DELAY_HI, SN65DSI_CHA_HIGH_SYNC_DELAY); > + > + /* cha, lower 8-bits of hsync_len */ > + regmap_write(sn->regmap, SN65DSI_CHA_HSYNC_WIDTH_LO, hsync_len & 0xff); > + > + /* cha, upper 2-bits of hsync_len */ > + regmap_write(sn->regmap, SN65DSI_CHA_HSYNC_WIDTH_HI, (hsync_len >> 8) & 0xff); > + > + /* cha, lower 8-bits of vsync_len */ > + regmap_write(sn->regmap, SN65DSI_CHA_VSYNC_WIDTH_LO, vsync_len & 0xff); > + > + /* cha, upper 2-bits of vsync_len */ > + regmap_write(sn->regmap, SN65DSI_CHA_VSYNC_WIDTH_HI, (vsync_len >> 8) & 0xff); > + > + /* cha, hback_porch */ > + regmap_write(sn->regmap, SN65DSI_CHA_HBACK_PORCH, hback_porch & 0xff); > + > + /* cha, vback_porch */ > + regmap_write(sn->regmap, SN65DSI_CHA_VBACK_PORCH, vback_porch & 0xff); > + > + /* cha, hfront_porch */ > + regmap_write(sn->regmap, SN65DSI_CHA_HFRONT_PORCH, hfront_porch & 0xff); > + > + /* cha, vfront_porch */ > + regmap_write(sn->regmap, SN65DSI_CHA_VFRONT_PORCH, vfront_porch & 0xff); > +} > + > +static int sn65dsi_get_clk_range(int min, int max, unsigned long clock, > + unsigned long start, unsigned long diff) > +{ > + unsigned long next; > + int i; > + > + for (i = min; i <= max; i++) { > + next = start + diff; > + if (start <= clock && clock < next) > + return i; > + > + start += diff; > + } > + > + return -EINVAL; > +} > + > +static void sn65dsi_enable(struct drm_bridge *bridge) > +{ > + struct sn65dsi *sn = bridge_to_sn65dsi(bridge); > + struct drm_display_mode *mode = bridge_to_mode(bridge); > + int bpp = mipi_dsi_pixel_format_to_bpp(sn->dsi->format); > + unsigned int lanes = sn->dsi->lanes; > + unsigned int pixel_clk = mode->clock * 1000; > + unsigned int dsi_clk = pixel_clk * bpp / (lanes * 2); > + unsigned int val; > + > + /* reset SOFT_RESET bit */ > + regmap_write(sn->regmap, SN65DSI_SOFT_RESET, 0x0); > + > + msleep(10); > + > + /* reset PLL_EN bit */ > + regmap_write(sn->regmap, SN65DSI_CLK_PLL, 0x0); > + > + msleep(10); > + > + /* setup lvds clock */ > + val = sn65dsi_get_clk_range(0, 5, pixel_clk, 25000000, 25000000); > + if (val < 0) { > + DRM_DEV_ERROR(sn->dev, "invalid LVDS clock range %d\n", val); > + return; > + } > + > + regmap_update_bits(sn->regmap, SN65DSI_LVDS_CLK, > + SN65DSI_LVDS_CLK_MASK, > + val << SN65DSI_LVDS_CLK_SHIFT); > + > + regmap_update_bits(sn->regmap, SN65DSI_LVDS_CLK, > + SN65DSI_LVDS_CLK_SRC_DSI, > + SN65DSI_LVDS_CLK_SRC_DSI); > + > + /* setup bridge clock divider */ > + val = (dsi_clk / pixel_clk) - 1; > + regmap_update_bits(sn->regmap, SN65DSI_CLK_DIV, > + SN65DSI_CLK_DIV_MASK, > + val << SN65DSI_CLK_DIV_SHIFT); > + > + /* configure dsi */ > + regmap_update_bits(sn->regmap, SN65DSI_DSI_CFG, > + SN65DSI_DSI_LANE_MASK, > + lanes << SN65DSI_DSI_LANE_SHIFT); > + > + /* dsi clock range */ > + val = sn65dsi_get_clk_range(8, 100, dsi_clk, 40000000, 5000000); > + if (val < 0) { > + DRM_DEV_ERROR(sn->dev, "invalid DSI clock range %d\n", val); > + return; > + } > + > + regmap_write(sn->regmap, SN65DSI_DSI_CLK_RANGE, val); > + > + /* setup lvds channels */ > + regmap_read(sn->regmap, SN65DSI_LVDS_MODE, &val); > + if (bpp == 24) > + val |= SN65DSI_LVDS_CHA_24BPP; > + regmap_write(sn->regmap, SN65DSI_LVDS_MODE, val); > + > + /* TODO Channel B required to set up for dual-link LVDS */ > + sn65dsi_setup_channels(sn, mode); > + > + /* set SOFT_RESET bit */ > + regmap_write(sn->regmap, SN65DSI_SOFT_RESET, SN65DSI_RESET_EN); > + > + msleep(10); > + > + /* set PLL_EN bit */ > + regmap_write(sn->regmap, SN65DSI_CLK_PLL, SN65DSI_PLL_EN); > + > + msleep(10); > +} > + > +static void sn65dsi_disable(struct drm_bridge *bridge) > +{ > + struct sn65dsi *sn = bridge_to_sn65dsi(bridge); > + > + /* set PLL_EN bit */ > + regmap_write(sn->regmap, SN65DSI_CLK_PLL, 0x0); > + > + msleep(10); > + > + /* set SOFT_RESET bit */ > + regmap_write(sn->regmap, SN65DSI_SOFT_RESET, 0x0); > + > + msleep(10); > +} > + > +static void sn65dsi_post_disable(struct drm_bridge *bridge) > +{ > + struct sn65dsi *sn = bridge_to_sn65dsi(bridge); > + > + gpiod_set_value_cansleep(sn->enable, 1); > + > + msleep(10); > + > + gpiod_set_value_cansleep(sn->enable, 0); > + > + msleep(10); > +} > + > +static void sn65dsi_pre_enable(struct drm_bridge *bridge) > +{ > + struct sn65dsi *sn = bridge_to_sn65dsi(bridge); > + > + gpiod_set_value_cansleep(sn->enable, 0); > + > + msleep(10); > + > + gpiod_set_value_cansleep(sn->enable, 1); > + > + msleep(10); > +} > + > +static int sn65dsi_attach(struct drm_bridge *bridge, enum drm_bridge_attach_flags flags) > +{ > + struct sn65dsi *sn = bridge_to_sn65dsi(bridge); > + struct mipi_dsi_host *host; > + struct mipi_dsi_device *dsi; > + const struct mipi_dsi_device_info info = { .type = "sn65dsi", > + .channel = 0, > + .node = NULL, > + }; > + int ret; > + > + host = of_find_mipi_dsi_host_by_node(sn->host_node); > + if (!host) { > + DRM_DEV_ERROR(sn->dev, "failed to find dsi host\n"); > + return -EPROBE_DEFER; > + } > + > + dsi = mipi_dsi_device_register_full(host, &info); > + if (IS_ERR(dsi)) { > + DRM_DEV_ERROR(sn->dev, "failed to create dsi device\n"); > + return PTR_ERR(sn->dsi); > + } > + > + sn->dsi = dsi; > + dsi->lanes = sn->dsi_lanes; > + dsi->format = MIPI_DSI_FMT_RGB888; > + dsi->mode_flags = MIPI_DSI_MODE_VIDEO; > + > + ret = mipi_dsi_attach(dsi); > + if (ret) { > + DRM_DEV_ERROR(sn->dev, "failed to attach dsi host\n"); > + goto err_dsi_attach; > + } > + > + return drm_bridge_attach(bridge->encoder, sn->panel_bridge, > + &sn->bridge, flags); > + > +err_dsi_attach: > + mipi_dsi_device_unregister(dsi); > + return ret; > +} > + > +static const struct drm_bridge_funcs sn65dsi_bridge_funcs = { > + .attach = sn65dsi_attach, > + .pre_enable = sn65dsi_pre_enable, > + .enable = sn65dsi_enable, > + .disable = sn65dsi_disable, > + .post_disable = sn65dsi_post_disable, > +}; > + > +static int sn65dsi_parse_dt(struct sn65dsi *sn) > +{ > + struct device *dev = sn->dev; > + struct device_node *endpoint, *parent; > + struct property *prop; > + struct drm_panel *panel; > + int len = 0; > + int ret; > + > + sn->enable = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW); > + if (IS_ERR(sn->enable)) { > + DRM_DEV_ERROR(dev, "failed to get enable gpio\n"); > + return PTR_ERR(sn->enable); > + } > + > + ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &panel, NULL); > + if (ret < 0) > + return ret; > + if (!panel) > + return -ENODEV; > + > + sn->panel_bridge = devm_drm_panel_bridge_add(dev, panel); > + if (IS_ERR(sn->panel_bridge)) > + return PTR_ERR(sn->panel_bridge); > + > + /* > + * To get the data-lanes of dsi, we need to access the port1 of dsi_out > + * from the port0 of bridge. > + */ > + endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1); > + if (endpoint) { > + /* dsi_out node */ > + parent = of_graph_get_remote_port_parent(endpoint); > + of_node_put(endpoint); > + if (parent) { > + /* dsi 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) { > + DRM_DEV_ERROR(dev, "failed to find data lane\n"); > + return -EPROBE_DEFER; > + } > + } > + } > + } > + > + sn->dsi_lanes = len / sizeof(u32); > + if (sn->dsi_lanes < 1 || sn->dsi_lanes > 4) > + return -EINVAL; > + > + sn->host_node = of_graph_get_remote_node(dev->of_node, 0, 0); > + if (!sn->host_node) > + return -ENODEV; > + > + of_node_put(sn->host_node); > + > + return 0; > +} > + > +static int sn65dsi_probe(struct i2c_client *client) > +{ > + struct sn65dsi *sn; > + int ret; > + > + sn = devm_kzalloc(&client->dev, sizeof(*sn), GFP_KERNEL); > + if (!sn) > + return -ENOMEM; > + > + i2c_set_clientdata(client, sn); > + sn->dev = &client->dev; > + > + sn->regmap = devm_regmap_init_i2c(client, &sn65dsi_regmap_config); > + if (IS_ERR(sn->regmap)) { > + DRM_DEV_ERROR(&client->dev, > + "regmap allocation failed (ret = %d)\n", ret); > + return PTR_ERR(sn->regmap); > + } > + > + ret = sn65dsi_parse_dt(sn); > + if (ret) > + return ret; > + > + sn->bridge.funcs = &sn65dsi_bridge_funcs; > + sn->bridge.of_node = client->dev.of_node; > + > + drm_bridge_add(&sn->bridge); > + > + return 0; > +} > + > +static int sn65dsi_remove(struct i2c_client *client) > +{ > + struct sn65dsi *sn = i2c_get_clientdata(client); > + > + drm_bridge_remove(&sn->bridge); > + > + return 0; > +} > + > +static struct i2c_device_id sn65dsi_i2c_id[] = { > + { "sn65dsi84", 0}, > + { /* sentinel */ } > +}; > +MODULE_DEVICE_TABLE(i2c, sn65dsi_i2c_id); > + > +static const struct of_device_id sn65dsi_match_table[] = { > + {.compatible = "ti,sn65dsi84"}, > + { /* sentinel */ } > +}; > +MODULE_DEVICE_TABLE(of, sn65dsi_match_table); > + > +static struct i2c_driver sn65dsi_driver = { > + .driver = { > + .name = "ti-sn65dsi84", > + .of_match_table = sn65dsi_match_table, > + }, > + .probe_new = sn65dsi_probe, > + .remove = sn65dsi_remove, > + .id_table = sn65dsi_i2c_id, > +}; > +module_i2c_driver(sn65dsi_driver); > + > +MODULE_AUTHOR("Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>"); > +MODULE_DESCRIPTION("SN65DSI84 DSI to LVDS bridge"); > +MODULE_LICENSE("GPL v2"); -- Regards, Laurent Pinchart
