[PATCH v3 2/2] drm: bridge: Add TI SN65DSI83/84/85 DSI to LVDS bridge
Jagan Teki
jagan at amarulasolutions.com
Sun Feb 14 17:44:53 UTC 2021
SN65DSI83/84/85 devices are MIPI DSI to LVDS based bridge
controller IC's from Texas Instruments.
SN65DSI83 - Single Channel DSI to Single-link LVDS bridge
SN65DSI84 - Single Channel DSI to Dual-link LVDS bridge
SN65DSI85 - Dual Channel DSI to Dual-link LVDS bridge
Driver is adding bridge configuration for Channel A, which
is a common configuration across all the bridge variants.
Add bridge driver for it.
Cc: Marek Vasut <marex at denx.de>
Signed-off-by: Jagan Teki <jagan at amarulasolutions.com>
---
Changes for v3:
- updated macro names to reflect datasheet
- add compatible for 83, 84 variants
- updated comments, kconfig
- fixed few Michael comments
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 | 20 ++
drivers/gpu/drm/bridge/Makefile | 1 +
drivers/gpu/drm/bridge/ti-sn65dsi8x.c | 475 ++++++++++++++++++++++++++
4 files changed, 502 insertions(+)
create mode 100644 drivers/gpu/drm/bridge/ti-sn65dsi8x.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 4f1084aae50d..2af01632f557 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6017,6 +6017,12 @@ 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 at amarulasolutions.com>
+S: Maintained
+F: Documentation/devicetree/bindings/display/bridge/ti,sn65dsi8x.yaml
+F: drivers/gpu/drm/bridge/ti-sn65dsi8x.c
+
DRM DRIVERS FOR V3D
M: Eric Anholt <eric at anholt.net>
S: Supported
diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 49d1565b7f25..8273a66c0eed 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -253,6 +253,26 @@ config DRM_TI_SN65DSI86
help
Texas Instruments SN65DSI86 DSI to eDP Bridge driver
+config DRM_TI_SN65DSI8X
+ tristate "TI SN65DSI83/84/85 DSI to LVDS bridge"
+ depends on OF
+ select DRM_KMS_HELPER
+ select DRM_MIPI_DSI
+ select DRM_PANEL_BRIDGE
+ select REGMAP_I2C
+ help
+ SN65DSI83/84/85 devices are MIPI DSI to LVDS based bridge controller
+ IC's from Texas Instruments.
+
+ SN65DSI83 - Single Channel DSI to Single-link LVDS bridge
+ SN65DSI84 - Single Channel DSI to Dual-link LVDS bridge
+ SN65DSI85 - Dual Channel DSI to Dual-link LVDS bridge
+
+ 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.
+
config DRM_TI_TPD12S015
tristate "TI TPD12S015 HDMI level shifter and ESD protection"
depends on OF
diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
index 3eb84b638988..e3d0dad9be30 100644
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -22,6 +22,7 @@ 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-$(CONFIG_DRM_TI_SN65DSI8X) += ti-sn65dsi8x.o
obj-$(CONFIG_DRM_TI_TFP410) += ti-tfp410.o
obj-$(CONFIG_DRM_TI_TPD12S015) += ti-tpd12s015.o
obj-$(CONFIG_DRM_NWL_MIPI_DSI) += nwl-dsi.o
diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi8x.c b/drivers/gpu/drm/bridge/ti-sn65dsi8x.c
new file mode 100644
index 000000000000..9b05b9295cbd
--- /dev/null
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi8x.c
@@ -0,0 +1,475 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2021 Engicam srl
+ * Copyright (C) 2021 Amarula Solutions(India)
+ * Author: Jagan Teki <jagan at amarulasolutions.com>
+ */
+
+#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>
+
+/* 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
+
+/* register bits */
+#define SOFT_RESET BIT(0)
+#define PLL_EN BIT(0)
+#define LVDS_CLK_RANGE_MASK GENMASK(3, 1)
+#define LVDS_CLK_RANGE_SHIFT 1
+#define HS_CLK_SRC BIT(0)
+#define DSI_CLK_DIV_MASK GENMASK(7, 3)
+#define DSI_CLK_DIV_SHIFT 3
+#define CHA_DSI_LANES_MASK GENMASK(4, 3)
+#define CHA_DSI_LANES_SHIFT 3
+#define HS_NEG_POLARITY BIT(6)
+#define VS_NEG_POLARITY BIT(5)
+#define LVDS_LINK_CFG BIT(4)
+#define CHA_24BPP_MODE BIT(3)
+#define CHA_SYNC_DELAY_LO 0x20
+#define CHA_SYNC_DELAY_HI 0x00
+
+enum sn65dsi_ports {
+ SN65DSI_IN_DSI,
+ SN65DSI_OUT0_LVDS,
+ SN65DSI_OUT1_LVDS,
+};
+
+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_configure_cha(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, CHA_SYNC_DELAY_LO);
+
+ /*cha, upper sync delay */
+ regmap_write(sn->regmap, SN65DSI_CHA_SYNC_DELAY_HI, CHA_SYNC_DELAY_HI);
+
+ /* 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,
+ LVDS_CLK_RANGE_MASK, val << LVDS_CLK_RANGE_SHIFT);
+
+ regmap_update_bits(sn->regmap, SN65DSI_LVDS_CLK, HS_CLK_SRC, HS_CLK_SRC);
+
+ /* setup bridge clock divider */
+ val = (dsi_clk / pixel_clk) - 1;
+ regmap_update_bits(sn->regmap, SN65DSI_CLK_DIV,
+ DSI_CLK_DIV_MASK, val << DSI_CLK_DIV_SHIFT);
+
+ /* configure dsi */
+ regmap_update_bits(sn->regmap, SN65DSI_DSI_CFG,
+ CHA_DSI_LANES_MASK, lanes << CHA_DSI_LANES_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 modes */
+ regmap_read(sn->regmap, SN65DSI_LVDS_MODE, &val);
+ if (mode->flags & DRM_MODE_FLAG_PVSYNC)
+ val |= VS_NEG_POLARITY;
+ if (mode->flags & DRM_MODE_FLAG_PHSYNC)
+ val |= HS_NEG_POLARITY;
+ if (bpp == 24) /* Channel A mode */
+ val |= CHA_24BPP_MODE;
+ regmap_write(sn->regmap, SN65DSI_LVDS_MODE, val);
+
+ /* TODO Channel B is not configure yet */
+ sn65dsi_configure_cha(sn, mode);
+
+ /* set PLL_EN bit */
+ regmap_write(sn->regmap, SN65DSI_CLK_PLL, PLL_EN);
+
+ msleep(10);
+
+ /* set SOFT_RESET bit */
+ regmap_write(sn->regmap, SN65DSI_SOFT_RESET, SOFT_RESET);
+
+ 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;
+ 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;
+ }
+
+ sn->dsi = mipi_dsi_device_register_full(host, &info);
+ if (IS_ERR(sn->dsi)) {
+ DRM_DEV_ERROR(sn->dev, "failed to create dsi device\n");
+ return PTR_ERR(sn->dsi);
+ }
+
+ sn->dsi->lanes = sn->dsi_lanes;
+ sn->dsi->format = MIPI_DSI_FMT_RGB888;
+ sn->dsi->mode_flags = MIPI_DSI_MODE_VIDEO;
+
+ ret = mipi_dsi_attach(sn->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(sn->dsi);
+ return ret;
+}
+
+static void sn65dsi_detach(struct drm_bridge *bridge)
+{
+ struct sn65dsi *sn = bridge_to_sn65dsi(bridge);
+
+ mipi_dsi_detach(sn->dsi);
+ mipi_dsi_device_unregister(sn->dsi);
+}
+
+static const struct drm_bridge_funcs sn65dsi_bridge_funcs = {
+ .attach = sn65dsi_attach,
+ .detach = sn65dsi_detach,
+ .disable = sn65dsi_disable,
+ .post_disable = sn65dsi_post_disable,
+ .pre_enable = sn65dsi_pre_enable,
+ .enable = sn65dsi_enable,
+};
+
+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, SN65DSI_OUT0_LVDS,
+ 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, SN65DSI_IN_DSI, -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);
+
+ /* TODO OUT1_LVDS is not parsed yet */
+
+ 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[] = {
+ { "sn65dsi83", 0},
+ { "sn65dsi84", 0},
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(i2c, sn65dsi_i2c_id);
+
+static const struct of_device_id sn65dsi_match_table[] = {
+ {.compatible = "ti,sn65dsi83"},
+ {.compatible = "ti,sn65dsi84"},
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, sn65dsi_match_table);
+
+static struct i2c_driver sn65dsi_driver = {
+ .driver = {
+ .name = "ti-sn65dsi8x",
+ .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 at amarulasolutions.com>");
+MODULE_DESCRIPTION("SN65DSI83/84/85 DSI to LVDS bridge");
+MODULE_LICENSE("GPL v2");
--
2.25.1
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