[PATCH v4 1/3] drm/bridge: add support for sn65dsi86 bridge driver
Sandeep Panda
spanda at codeaurora.org
Fri Apr 27 09:39:40 UTC 2018
Add support for TI's sn65dsi86 dsi2edp bridge chip.
The chip converts DSI transmitted signal to eDP signal,
which is fed to the connected eDP panel.
This chip can be controlled via either i2c interface or
dsi interface. Currently in driver all the control registers
are being accessed through i2c interface only.
Also as of now HPD support has not been added to bridge
chip driver.
Changes in v1:
- Split the dt-bindings and the driver support into separate patches
(Andrzej Hajda).
- Use of gpiod APIs to parse and configure gpios instead of obsolete ones
(Andrzej Hajda).
- Use macros to define the register offsets (Andrzej Hajda).
Changes in v2:
- Separate out edp panel specific HW resource handling from bridge
driver and create a separate edp panel drivers to handle panel
specific mode information and HW resources (Sean Paul).
- Replace pr_* APIs to DRM_* APIs to log error or debug information
(Sean Paul).
- Remove some of the unnecessary structure/variable from driver (Sean
Paul).
- Rename the function and structure prefix "sn65dsi86" to "ti_sn_bridge"
(Sean Paul / Rob Herring).
- Remove most of the hard-coding and modified the bridge init sequence
based on current mode (Sean Paul).
- Remove the existing function to retrieve the EDID data and
implemented this as an i2c_adapter and use drm_get_edid() (Sean Paul).
- Remove the dummy irq handler implementation, will add back the
proper irq handling later (Sean Paul).
- Capture the required enable gpios in a single array based on dt entry
instead of having individual descriptor for each gpio (Sean Paul).
Changes in v3:
- Remove usage of irq_gpio and replace it as "interrupts" property (Rob
Herring).
- Remove the unnecessary header file inclusions (Sean Paul).
- Rearrange the header files in alphabetical order (Sean Paul).
- Use regmap interface to perform i2c transactions.
- Update Copyright/License field and address other review comments
(Jordan Crouse).
Changes in v4:
- Update License/Copyright (Sean Paul).
- Add Kconfig and Makefile changes (Sean Paul).
- Drop i2c gpio handling from this bridge driver, since i2c sda/scl gpios
will be handled by i2c master.
- Remove unnecessary goto statements (Sean Paul).
- Add mutex lock to power_ctrl API to avoid race conditions (Sean
Paul).
- Add support to parse reference clk frequency from dt(optional).
- Update the bridge chip enable/disable sequence.
Signed-off-by: Sandeep Panda <spanda at codeaurora.org>
---
drivers/gpu/drm/bridge/Kconfig | 9 +
drivers/gpu/drm/bridge/Makefile | 1 +
drivers/gpu/drm/bridge/ti-sn65dsi86.c | 721 ++++++++++++++++++++++++++++++++++
3 files changed, 731 insertions(+)
create mode 100644 drivers/gpu/drm/bridge/ti-sn65dsi86.c
diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 3b99d5a..8153150 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -108,6 +108,15 @@ config DRM_TI_TFP410
---help---
Texas Instruments TFP410 DVI/HDMI Transmitter driver
+config DRM_TI_SN65DSI86
+ tristate "TI SN65DSI86 DSI to eDP bridge"
+ depends on OF
+ select DRM_KMS_HELPER
+ select REGMAP_I2C
+ select DRM_PANEL
+ ---help---
+ Texas Instruments SN65DSI86 DSI to eDP Bridge driver
+
source "drivers/gpu/drm/bridge/analogix/Kconfig"
source "drivers/gpu/drm/bridge/adv7511/Kconfig"
diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
index 373eb28..3711be8 100644
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -12,4 +12,5 @@ obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o
obj-$(CONFIG_DRM_ANALOGIX_DP) += analogix/
obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/
obj-$(CONFIG_DRM_TI_TFP410) += ti-tfp410.o
+obj-$(CONFIG_DRM_TI_SN65DSI86) += ti-sn65dsi86.o
obj-y += synopsys/
diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
new file mode 100644
index 0000000..28a4be8
--- /dev/null
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -0,0 +1,721 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_panel.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/of_gpio.h>
+#include <linux/of_graph.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+#define SN_BRIDGE_REVISION_ID 0x2
+
+/* Link Training specific registers */
+#define SN_DEVICE_REV_REG 0x08
+#define SN_REFCLK_FREQ_REG 0x0A
+#define SN_DSI_LANES_REG 0x10
+#define SN_DSIA_CLK_FREQ_REG 0x12
+#define SN_ENH_FRAME_REG 0x5A
+#define SN_SSC_CONFIG_REG 0x93
+#define SN_DATARATE_CONFIG_REG 0x94
+#define SN_PLL_ENABLE_REG 0x0D
+#define SN_SCRAMBLE_CONFIG_REG 0x95
+#define SN_AUX_WDATA0_REG 0x64
+#define SN_AUX_ADDR_19_16_REG 0x74
+#define SN_AUX_ADDR_15_8_REG 0x75
+#define SN_AUX_ADDR_7_0_REG 0x76
+#define SN_AUX_LENGTH_REG 0x77
+#define SN_AUX_CMD_REG 0x78
+#define SN_ML_TX_MODE_REG 0x96
+/* video config specific registers */
+#define SN_CHA_ACTIVE_LINE_LENGTH_LOW_REG 0x20
+#define SN_CHA_ACTIVE_LINE_LENGTH_HIGH_REG 0x21
+#define SN_CHA_VERTICAL_DISPLAY_SIZE_LOW_REG 0x24
+#define SN_CHA_VERTICAL_DISPLAY_SIZE_HIGH_REG 0x25
+#define SN_CHA_HSYNC_PULSE_WIDTH_LOW_REG 0x2C
+#define SN_CHA_HSYNC_PULSE_WIDTH_HIGH_REG 0x2D
+#define SN_CHA_VSYNC_PULSE_WIDTH_LOW_REG 0x30
+#define SN_CHA_VSYNC_PULSE_WIDTH_HIGH_REG 0x31
+#define SN_CHA_HORIZONTAL_BACK_PORCH_REG 0x34
+#define SN_CHA_VERTICAL_BACK_PORCH_REG 0x36
+#define SN_CHA_HORIZONTAL_FRONT_PORCH_REG 0x38
+#define SN_CHA_VERTICAL_FRONT_PORCH_REG 0x3A
+#define SN_DATA_FORMAT_REG 0x5B
+
+#define MIN_DSI_CLK_FREQ_MHZ 40
+#define SN_DEFAULT_REF_CLK_KHZ 19200
+
+/* fudge factor required to account for 8b/10b encoding */
+#define DP_CLK_FUDGE_NUM 10
+#define DP_CLK_FUDGE_DEN 8
+
+#define DPPLL_CLK_SRC_REFCLK 0
+#define DPPLL_CLK_SRC_DSICLK 1
+
+#define SN_DSIA_REFCLK_OFFSET 1
+#define SN_DSIA_LANE_OFFSET 3
+#define SN_DP_LANE_OFFSET 4
+#define SN_DP_DATA_RATE_OFFSET 5
+#define SN_TIMING_HIGH_OFFSET 8
+
+#define SN_ENABLE_VID_STREAM_BIT BIT(3)
+#define SN_DSIA_NUM_LANES_BITS (BIT(4) | BIT(3))
+#define SN_DP_NUM_LANES_BITS (BIT(5) | BIT(4))
+#define SN_DP_DATA_RATE_BITS (BIT(7) | BIT(6) | BIT(5))
+
+struct ti_sn_bridge {
+ struct device *dev;
+ struct regmap *regmap;
+ struct drm_bridge bridge;
+ struct drm_connector connector;
+ struct device_node *host_node;
+ struct mipi_dsi_device *dsi;
+ unsigned int refclk_khz;
+ struct drm_panel *panel;
+ struct gpio_desc *enable_gpio;
+ unsigned int num_supplies;
+ struct regulator_bulk_data *supplies;
+ struct i2c_adapter *ddc;
+ unsigned int num_modes;
+ struct drm_display_mode curr_mode;
+ struct mutex lock;
+ unsigned int ctrl_ref_count;
+};
+
+static const struct regmap_range ti_sn_bridge_volatile_ranges[] = {
+ { .range_min = 0, .range_max = 0xff },
+};
+
+static const struct regmap_access_table ti_sn_bridge_volatile_table = {
+ .yes_ranges = ti_sn_bridge_volatile_ranges,
+ .n_yes_ranges = ARRAY_SIZE(ti_sn_bridge_volatile_ranges),
+};
+
+static const struct regmap_config ti_sn_bridge_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .volatile_table = &ti_sn_bridge_volatile_table,
+ .cache_type = REGCACHE_NONE,
+};
+
+static int ti_sn_bridge_power_ctrl(struct ti_sn_bridge *pdata, bool enable)
+{
+ int ret = 0;
+
+ mutex_lock(&pdata->lock);
+ if (enable)
+ pdata->ctrl_ref_count++;
+ else
+ pdata->ctrl_ref_count--;
+
+ if (enable && (pdata->ctrl_ref_count == 1)) {
+ ret = regulator_bulk_enable(pdata->num_supplies,
+ pdata->supplies);
+ if (ret) {
+ DRM_ERROR("bridge regulator enable failed\n");
+ goto exit;
+ }
+
+ gpiod_set_value(pdata->enable_gpio, 1);
+ } else if (!enable && !pdata->ctrl_ref_count) {
+ gpiod_set_value(pdata->enable_gpio, 0);
+
+ regulator_bulk_disable(pdata->num_supplies, pdata->supplies);
+ } else {
+ DRM_DEBUG("ti_sn_bridge power ctrl: %d refcount: %d\n",
+ enable, pdata->ctrl_ref_count);
+ }
+
+exit:
+ mutex_unlock(&pdata->lock);
+ return ret;
+}
+
+/* Connector funcs */
+static struct ti_sn_bridge *
+connector_to_ti_sn_bridge(struct drm_connector *connector)
+{
+ return container_of(connector, struct ti_sn_bridge, connector);
+}
+
+static int ti_sn_bridge_connector_get_modes(struct drm_connector *connector)
+{
+ struct ti_sn_bridge *pdata = connector_to_ti_sn_bridge(connector);
+ struct drm_panel *panel = pdata->panel;
+ struct edid *edid;
+
+ if (panel) {
+ DRM_DEBUG("get mode from connected drm_panel\n");
+ pdata->num_modes = drm_panel_get_modes(panel);
+ return pdata->num_modes;
+ }
+
+ /* get from EDID */
+ if (!pdata->ddc)
+ return 0;
+
+ ti_sn_bridge_power_ctrl(pdata, true);
+ edid = drm_get_edid(connector, pdata->ddc);
+ ti_sn_bridge_power_ctrl(pdata, false);
+ if (!edid)
+ return 0;
+
+ drm_mode_connector_update_edid_property(connector, edid);
+ pdata->num_modes = drm_add_edid_modes(connector, edid);
+ drm_edid_to_eld(connector, edid);
+ kfree(edid);
+
+ return pdata->num_modes;
+}
+
+static enum drm_mode_status
+ti_sn_bridge_connector_mode_valid(struct drm_connector *connector,
+ struct drm_display_mode *mode)
+{
+ /* maximum supported resolution is 4K at 60 fps */
+ if (mode->clock > 594000)
+ return MODE_CLOCK_HIGH;
+
+ return MODE_OK;
+}
+
+static struct drm_connector_helper_funcs ti_sn_bridge_connector_helper_funcs = {
+ .get_modes = ti_sn_bridge_connector_get_modes,
+ .mode_valid = ti_sn_bridge_connector_mode_valid,
+};
+
+static enum drm_connector_status
+ti_sn_bridge_connector_detect(struct drm_connector *connector, bool force)
+{
+ struct ti_sn_bridge *pdata = connector_to_ti_sn_bridge(connector);
+
+ /**
+ * TODO: Currently if drm_panel is present, then always
+ * return the status as connected. Need to add support to detect
+ * device state for no panel(hot pluggable) scenarios.
+ */
+ if (pdata->panel)
+ return connector_status_connected;
+ else
+ return connector_status_unknown;
+}
+
+static const struct drm_connector_funcs ti_sn_bridge_connector_funcs = {
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .detect = ti_sn_bridge_connector_detect,
+ .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,
+};
+
+static struct ti_sn_bridge *bridge_to_ti_sn_bridge(struct drm_bridge *bridge)
+{
+ return container_of(bridge, struct ti_sn_bridge, bridge);
+}
+
+static int ti_sn_bridge_read_device_rev(struct ti_sn_bridge *pdata)
+{
+ unsigned int rev = 0;
+ int ret = 0;
+
+ ret = regmap_read(pdata->regmap, SN_DEVICE_REV_REG, &rev);
+ if (ret)
+ return ret;
+
+ if (rev != SN_BRIDGE_REVISION_ID) {
+ DRM_ERROR("ti_sn_bridge revision id: 0x%x mismatch\n", rev);
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static const char * const ti_sn_bridge_supply_names[] = {
+ "vccio",
+ "vpll",
+ "vcca",
+ "vcc",
+};
+
+static int ti_sn_bridge_parse_regulators(struct ti_sn_bridge *pdata)
+{
+ unsigned int i;
+
+ pdata->num_supplies = ARRAY_SIZE(ti_sn_bridge_supply_names);
+
+ pdata->supplies = devm_kcalloc(pdata->dev, pdata->num_supplies,
+ sizeof(*pdata->supplies), GFP_KERNEL);
+ if (!pdata->supplies)
+ return -ENOMEM;
+
+ for (i = 0; i < pdata->num_supplies; i++)
+ pdata->supplies[i].supply = ti_sn_bridge_supply_names[i];
+
+ return devm_regulator_bulk_get(pdata->dev,
+ pdata->num_supplies, pdata->supplies);
+}
+
+static int ti_sn_bridge_attach_panel(struct ti_sn_bridge *pdata)
+{
+ struct device_node *panel_node, *port, *endpoint;
+
+ pdata->panel = NULL;
+ port = of_graph_get_port_by_id(pdata->dev->of_node, 1);
+ if (port) {
+ endpoint = of_get_child_by_name(port, "endpoint");
+ of_node_put(port);
+ if (!endpoint) {
+ DRM_ERROR("no output endpoint found\n");
+ return -EINVAL;
+ }
+
+ panel_node = of_graph_get_remote_port_parent(endpoint);
+ of_node_put(endpoint);
+ if (!panel_node) {
+ DRM_ERROR("no output node found\n");
+ return -EINVAL;
+ }
+
+ pdata->panel = of_drm_find_panel(panel_node);
+ of_node_put(panel_node);
+ if (!pdata->panel) {
+ DRM_ERROR("no panel node found\n");
+ return -EINVAL;
+ }
+ drm_panel_attach(pdata->panel, &pdata->connector);
+ DRM_DEBUG("panel attached\n");
+ }
+
+ return 0;
+}
+
+static int ti_sn_bridge_attach(struct drm_bridge *bridge)
+{
+ struct mipi_dsi_host *host;
+ struct mipi_dsi_device *dsi;
+ struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
+ int ret;
+ const struct mipi_dsi_device_info info = { .type = "ti_sn_bridge",
+ .channel = 0,
+ .node = NULL,
+ };
+
+ if (!bridge->encoder) {
+ DRM_ERROR("Parent encoder object not found\n");
+ return -ENODEV;
+ }
+
+ /* HPD not supported */
+ pdata->connector.polled = 0;
+
+ ret = drm_connector_init(bridge->dev, &pdata->connector,
+ &ti_sn_bridge_connector_funcs,
+ DRM_MODE_CONNECTOR_eDP);
+ if (ret) {
+ DRM_ERROR("Failed to initialize connector with drm\n");
+ return ret;
+ }
+
+ drm_connector_helper_add(&pdata->connector,
+ &ti_sn_bridge_connector_helper_funcs);
+ drm_mode_connector_attach_encoder(&pdata->connector, bridge->encoder);
+
+ host = of_find_mipi_dsi_host_by_node(pdata->host_node);
+ if (!host) {
+ DRM_ERROR("failed to find dsi host\n");
+ return -ENODEV;
+ }
+
+ dsi = mipi_dsi_device_register_full(host, &info);
+ if (IS_ERR(dsi)) {
+ DRM_ERROR("failed to create dsi device\n");
+ ret = PTR_ERR(dsi);
+ return ret;
+ }
+
+ /* TODO: setting to 4 lanes always for now */
+ dsi->lanes = 4;
+ dsi->format = MIPI_DSI_FMT_RGB888;
+ dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
+ MIPI_DSI_MODE_EOT_PACKET | MIPI_DSI_MODE_VIDEO_HSE;
+
+ ret = mipi_dsi_attach(dsi);
+ if (ret < 0) {
+ DRM_ERROR("failed to attach dsi to host\n");
+ mipi_dsi_device_unregister(dsi);
+ return ret;
+ }
+
+ pdata->dsi = dsi;
+
+ DRM_DEBUG("bridge attached\n");
+ /* attach panel to bridge */
+ ti_sn_bridge_attach_panel(pdata);
+
+ return 0;
+}
+
+static void ti_sn_bridge_mode_set(struct drm_bridge *bridge,
+ struct drm_display_mode *mode,
+ struct drm_display_mode *adj_mode)
+{
+ struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
+
+ DRM_DEBUG("mode_set: hdisplay=%d, vdisplay=%d, vrefresh=%d, clock=%d\n",
+ adj_mode->hdisplay, adj_mode->vdisplay,
+ adj_mode->vrefresh, adj_mode->clock);
+
+ drm_mode_copy(&pdata->curr_mode, adj_mode);
+}
+
+static void ti_sn_bridge_disable(struct drm_bridge *bridge)
+{
+ struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
+ struct drm_panel *panel = pdata->panel;
+
+ if (panel) {
+ drm_panel_disable(panel);
+ drm_panel_unprepare(panel);
+ }
+
+ /* disable video stream */
+ regmap_update_bits(pdata->regmap, SN_ENH_FRAME_REG,
+ SN_ENABLE_VID_STREAM_BIT, 0);
+ /* semi auto link training mode OFF */
+ regmap_write(pdata->regmap, SN_ML_TX_MODE_REG, 0);
+ /* disable DP PLL */
+ regmap_write(pdata->regmap, SN_PLL_ENABLE_REG, 0);
+}
+
+/* reference clk frequencies supported by the bridge in KHz */
+u32 ti_sn_bridge_ref_clk_table[] = {
+ 12000,
+ 19200,
+ 26000,
+ 27000,
+ 38400,
+};
+
+static void ti_sn_bridge_set_refclk(struct ti_sn_bridge *pdata)
+{
+ int i = 0;
+
+ for (i = 0; i < ARRAY_SIZE(ti_sn_bridge_ref_clk_table); i++)
+ if (ti_sn_bridge_ref_clk_table[i] == pdata->refclk_khz)
+ break;
+ regmap_write(pdata->regmap, SN_REFCLK_FREQ_REG,
+ (DPPLL_CLK_SRC_REFCLK | (i << SN_DSIA_REFCLK_OFFSET)));
+}
+
+struct dp_data_rate {
+ unsigned int bit_val;
+ unsigned int dp_rate;
+};
+
+/* dp data rate supported by the bridge Mbps */
+static struct dp_data_rate ti_sn_bridge_dp_rate_table[] = {
+ {1, 1620},
+ {2, 2160},
+ {3, 2430},
+ {4, 2700},
+ {5, 3240},
+ {6, 4320},
+ {7, 5400},
+};
+
+static void ti_sn_bridge_set_dsi_dp_rate(struct ti_sn_bridge *pdata)
+{
+ unsigned int bit_rate_mhz, clk_freq_mhz, dp_rate_mhz;
+ unsigned int val = 0, i = 0;
+ struct drm_display_mode *mode = &pdata->curr_mode;
+
+ /* set DSIA clk frequency */
+ bit_rate_mhz = (mode->clock / 1000) *
+ mipi_dsi_pixel_format_to_bpp(pdata->dsi->format);
+ clk_freq_mhz = bit_rate_mhz / (pdata->dsi->lanes * 2);
+
+ /* for each increment in val, frequency increases by 5MHz */
+ val = (MIN_DSI_CLK_FREQ_MHZ / 5) +
+ (((clk_freq_mhz - MIN_DSI_CLK_FREQ_MHZ) / 5) & 0xFF);
+ regmap_write(pdata->regmap, SN_DSIA_CLK_FREQ_REG, val);
+
+ /* set DP data rate */
+ dp_rate_mhz = ((bit_rate_mhz / pdata->dsi->lanes) * DP_CLK_FUDGE_NUM) /
+ DP_CLK_FUDGE_DEN;
+ for (i = 0; i < ARRAY_SIZE(ti_sn_bridge_dp_rate_table); i++)
+ if (ti_sn_bridge_dp_rate_table[i].dp_rate > dp_rate_mhz)
+ break;
+ if (i == ARRAY_SIZE(ti_sn_bridge_dp_rate_table))
+ i--; /* set to maximum possible */
+
+ val = ti_sn_bridge_dp_rate_table[i].bit_val << SN_DP_DATA_RATE_OFFSET;
+ regmap_update_bits(pdata->regmap, SN_DATARATE_CONFIG_REG,
+ SN_DP_DATA_RATE_BITS, val);
+}
+
+static void ti_sn_bridge_set_video_timings(struct ti_sn_bridge *pdata)
+{
+ struct drm_display_mode *mode = &pdata->curr_mode;
+
+ regmap_write(pdata->regmap, SN_CHA_ACTIVE_LINE_LENGTH_LOW_REG,
+ mode->hdisplay & 0xFF);
+ regmap_write(pdata->regmap, SN_CHA_ACTIVE_LINE_LENGTH_HIGH_REG,
+ (mode->hdisplay >> SN_TIMING_HIGH_OFFSET) & 0xFF);
+ regmap_write(pdata->regmap, SN_CHA_VERTICAL_DISPLAY_SIZE_LOW_REG,
+ mode->vdisplay & 0xFF);
+ regmap_write(pdata->regmap, SN_CHA_VERTICAL_DISPLAY_SIZE_HIGH_REG,
+ (mode->vdisplay >> SN_TIMING_HIGH_OFFSET) & 0xFF);
+ regmap_write(pdata->regmap, SN_CHA_HSYNC_PULSE_WIDTH_LOW_REG,
+ (mode->hsync_end - mode->hsync_start) & 0xFF);
+ regmap_write(pdata->regmap, SN_CHA_HSYNC_PULSE_WIDTH_HIGH_REG,
+ ((mode->hsync_end - mode->hsync_start) >>
+ SN_TIMING_HIGH_OFFSET) & 0xFF);
+ regmap_write(pdata->regmap, SN_CHA_VSYNC_PULSE_WIDTH_LOW_REG,
+ (mode->vsync_end - mode->vsync_start) & 0xFF);
+ regmap_write(pdata->regmap, SN_CHA_VSYNC_PULSE_WIDTH_HIGH_REG,
+ ((mode->vsync_end - mode->vsync_start) >>
+ SN_TIMING_HIGH_OFFSET) & 0xFF);
+ regmap_write(pdata->regmap, SN_CHA_HORIZONTAL_BACK_PORCH_REG,
+ (mode->htotal - mode->hsync_end) & 0xFF);
+ regmap_write(pdata->regmap, SN_CHA_VERTICAL_BACK_PORCH_REG,
+ (mode->vtotal - mode->vsync_end) & 0xFF);
+ regmap_write(pdata->regmap, SN_CHA_HORIZONTAL_FRONT_PORCH_REG,
+ (mode->hsync_start - mode->hdisplay) & 0xFF);
+ regmap_write(pdata->regmap, SN_CHA_VERTICAL_FRONT_PORCH_REG,
+ (mode->vsync_start - mode->vdisplay) & 0xFF);
+ usleep_range(10000, 10050); /* 10ms delay recommended by spec */
+}
+
+static void ti_sn_bridge_enable(struct drm_bridge *bridge)
+{
+ struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
+ struct drm_panel *panel = pdata->panel;
+ unsigned int val = 0;
+
+ if (panel)
+ drm_panel_prepare(panel);
+
+ /* DSI_A lane config */
+ val = (4 - pdata->dsi->lanes) << SN_DSIA_LANE_OFFSET;
+ regmap_update_bits(pdata->regmap, SN_DSI_LANES_REG,
+ SN_DSIA_NUM_LANES_BITS, val);
+
+ /* DP lane config */
+ val = (pdata->dsi->lanes - 1) << SN_DP_LANE_OFFSET;
+ regmap_update_bits(pdata->regmap, SN_SSC_CONFIG_REG,
+ SN_DP_NUM_LANES_BITS, val);
+
+ /* set dsi/dp clk frequency value */
+ ti_sn_bridge_set_dsi_dp_rate(pdata);
+
+ /* enable DP PLL */
+ regmap_write(pdata->regmap, SN_PLL_ENABLE_REG, 1);
+ usleep_range(10000, 10050); /* 10ms delay recommended by spec */
+
+ /**
+ * The SN65DSI86 only supports ASSR Display Authentication method and
+ * this method is enabled by default. An eDP panel must support this
+ * authentication method. We need to enable this method in the eDP panel
+ * at DisplayPort address 0x0010A prior to link training.
+ */
+ regmap_write(pdata->regmap, SN_AUX_WDATA0_REG, 0x01);
+ regmap_write(pdata->regmap, SN_AUX_ADDR_19_16_REG, 0x00);
+ regmap_write(pdata->regmap, SN_AUX_ADDR_15_8_REG, 0x01);
+ regmap_write(pdata->regmap, SN_AUX_ADDR_7_0_REG, 0x0A);
+ regmap_write(pdata->regmap, SN_AUX_LENGTH_REG, 0x01);
+ regmap_write(pdata->regmap, SN_AUX_CMD_REG, 0x81);
+ usleep_range(10000, 10050); /* 10ms delay recommended by spec */
+
+ /* Semi auto link training mode */
+ regmap_write(pdata->regmap, SN_ML_TX_MODE_REG, 0x0A);
+ msleep(20); /* 20ms delay recommended by spec */
+
+ /* config video parameters */
+ ti_sn_bridge_set_video_timings(pdata);
+
+ /* enable video stream */
+ regmap_update_bits(pdata->regmap, SN_ENH_FRAME_REG,
+ SN_ENABLE_VID_STREAM_BIT, SN_ENABLE_VID_STREAM_BIT);
+
+ if (panel)
+ drm_panel_enable(panel);
+}
+
+void ti_sn_bridge_pre_enable(struct drm_bridge *bridge)
+{
+ struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
+
+ ti_sn_bridge_power_ctrl(pdata, true);
+
+ /* configure bridge CLK_SRC and ref_clk */
+ ti_sn_bridge_set_refclk(pdata);
+}
+
+void ti_sn_bridge_post_disable(struct drm_bridge *bridge)
+{
+ struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
+
+ ti_sn_bridge_power_ctrl(pdata, false);
+}
+
+static const struct drm_bridge_funcs ti_sn_bridge_funcs = {
+ .attach = ti_sn_bridge_attach,
+ .pre_enable = ti_sn_bridge_pre_enable,
+ .enable = ti_sn_bridge_enable,
+ .disable = ti_sn_bridge_disable,
+ .post_disable = ti_sn_bridge_post_disable,
+ .mode_set = ti_sn_bridge_mode_set,
+};
+
+static int ti_sn_bridge_parse_dsi_host(struct ti_sn_bridge *pdata)
+{
+ struct device_node *np = pdata->dev->of_node;
+ struct device_node *end_node;
+
+ end_node = of_graph_get_endpoint_by_regs(np, 0, 0);
+ if (!end_node) {
+ DRM_ERROR("remote endpoint not found\n");
+ return -ENODEV;
+ }
+
+ pdata->host_node = of_graph_get_remote_port_parent(end_node);
+ of_node_put(end_node);
+ if (!pdata->host_node) {
+ DRM_ERROR("remote node not found\n");
+ return -ENODEV;
+ }
+ of_node_put(pdata->host_node);
+
+ return 0;
+}
+
+static int ti_sn_bridge_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct ti_sn_bridge *pdata;
+ struct device_node *ddc_node;
+ int ret = 0;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ DRM_ERROR("device doesn't support I2C\n");
+ return -ENODEV;
+ }
+
+ pdata = devm_kzalloc(&client->dev,
+ sizeof(struct ti_sn_bridge), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ pdata->dev = &client->dev;
+ DRM_DEBUG("I2C address is %x\n", client->addr);
+
+ pdata->regmap = devm_regmap_init_i2c(client,
+ &ti_sn_bridge_regmap_config);
+ if (IS_ERR(pdata->regmap))
+ return PTR_ERR(pdata->regmap);
+
+ pdata->enable_gpio = devm_gpiod_get(pdata->dev,
+ "enable", GPIOD_OUT_LOW);
+ if (IS_ERR(pdata->enable_gpio)) {
+ DRM_ERROR("failed to get enable gpio from DT\n");
+ ret = PTR_ERR(pdata->enable_gpio);
+ return ret;
+ }
+
+ ret = ti_sn_bridge_parse_regulators(pdata);
+ if (ret) {
+ DRM_ERROR("failed to parse regulators\n");
+ return ret;
+ }
+
+ ret = of_property_read_u32(pdata->dev->of_node,
+ "refclk-freq-khz", &pdata->refclk_khz);
+ if (ret)
+ pdata->refclk_khz = SN_DEFAULT_REF_CLK_KHZ;
+
+ ret = ti_sn_bridge_parse_dsi_host(pdata);
+ if (ret)
+ return ret;
+
+ ddc_node = of_parse_phandle(pdata->dev->of_node, "ddc-i2c-bus", 0);
+ if (ddc_node) {
+ pdata->ddc = of_find_i2c_adapter_by_node(ddc_node);
+ of_node_put(ddc_node);
+ if (!pdata->ddc) {
+ dev_dbg(pdata->dev, "failed to read ddc node\n");
+ return -EPROBE_DEFER;
+ }
+ } else {
+ dev_dbg(pdata->dev, "no ddc property found\n");
+ }
+
+ ti_sn_bridge_power_ctrl(pdata, true);
+ ret = ti_sn_bridge_read_device_rev(pdata);
+ ti_sn_bridge_power_ctrl(pdata, false);
+ if (ret)
+ return ret;
+
+ i2c_set_clientdata(client, pdata);
+ mutex_init(&pdata->lock);
+
+ pdata->bridge.funcs = &ti_sn_bridge_funcs;
+ pdata->bridge.of_node = client->dev.of_node;
+
+ drm_bridge_add(&pdata->bridge);
+
+ DRM_DEBUG("bridge device registered successfully\n");
+
+ return 0;
+}
+
+static int ti_sn_bridge_remove(struct i2c_client *client)
+{
+ struct ti_sn_bridge *pdata = i2c_get_clientdata(client);
+
+ if (!pdata)
+ return -EINVAL;
+
+ mipi_dsi_detach(pdata->dsi);
+ mipi_dsi_device_unregister(pdata->dsi);
+
+ drm_bridge_remove(&pdata->bridge);
+ i2c_put_adapter(pdata->ddc);
+
+ return 0;
+}
+
+static struct i2c_device_id ti_sn_bridge_id[] = {
+ { "ti,sn65dsi86", 0},
+ {},
+};
+MODULE_DEVICE_TABLE(i2c, ti_sn_bridge_id);
+
+static const struct of_device_id ti_sn_bridge_match_table[] = {
+ {.compatible = "ti,sn65dsi86"},
+ {},
+};
+MODULE_DEVICE_TABLE(of, ti_sn_bridge_match_table);
+
+static struct i2c_driver ti_sn_bridge_driver = {
+ .driver = {
+ .name = "ti_sn65dsi86",
+ .owner = THIS_MODULE,
+ .of_match_table = ti_sn_bridge_match_table,
+ },
+ .probe = ti_sn_bridge_probe,
+ .remove = ti_sn_bridge_remove,
+ .id_table = ti_sn_bridge_id,
+};
+
+module_i2c_driver(ti_sn_bridge_driver);
+MODULE_DESCRIPTION("sn65dsi86 DSI to eDP bridge driver");
+MODULE_LICENSE("GPL v2");
--
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