| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Peter Senna Tschudin | 1387 | 97.81% | 2 | 22.22% |
| Laurent Pinchart | 21 | 1.48% | 1 | 11.11% |
| Daniel Vetter | 3 | 0.21% | 3 | 33.33% |
| Boris Brezillon | 3 | 0.21% | 1 | 11.11% |
| Sam Ravnborg | 2 | 0.14% | 1 | 11.11% |
| Thomas Gleixner | 2 | 0.14% | 1 | 11.11% |
| Total | 1418 | 9 |
// SPDX-License-Identifier: GPL-2.0-only /* * Driver for MegaChips STDP4028 with GE B850v3 firmware (LVDS-DP) * Driver for MegaChips STDP2690 with GE B850v3 firmware (DP-DP++) * Copyright (c) 2017, Collabora Ltd. * Copyright (c) 2017, General Electric Company * This driver creates a drm_bridge and a drm_connector for the LVDS to DP++ * display bridge of the GE B850v3. There are two physical bridges on the video * signal pipeline: a STDP4028(LVDS to DP) and a STDP2690(DP to DP++). The * physical bridges are automatically configured by the input video signal, and * the driver has no access to the video processing pipeline. The driver is * only needed to read EDID from the STDP2690 and to handle HPD events from the * STDP4028. The driver communicates with both bridges over i2c. The video * signal pipeline is as follows: * * Host -> LVDS|--(STDP4028)--|DP -> DP|--(STDP2690)--|DP++ -> Video output */ #include <linux/i2c.h> #include <linux/module.h> #include <linux/of.h> #include <drm/drm_atomic.h> #include <drm/drm_atomic_helper.h> #include <drm/drm_bridge.h> #include <drm/drm_edid.h> #include <drm/drm_print.h> #include <drm/drm_probe_helper.h> #define EDID_EXT_BLOCK_CNT 0x7E #define STDP4028_IRQ_OUT_CONF_REG 0x02 #define STDP4028_DPTX_IRQ_EN_REG 0x3C #define STDP4028_DPTX_IRQ_STS_REG 0x3D #define STDP4028_DPTX_STS_REG 0x3E #define STDP4028_DPTX_DP_IRQ_EN 0x1000 #define STDP4028_DPTX_HOTPLUG_IRQ_EN 0x0400 #define STDP4028_DPTX_LINK_CH_IRQ_EN 0x2000 #define STDP4028_DPTX_IRQ_CONFIG \ (STDP4028_DPTX_LINK_CH_IRQ_EN | STDP4028_DPTX_HOTPLUG_IRQ_EN) #define STDP4028_DPTX_HOTPLUG_STS 0x0200 #define STDP4028_DPTX_LINK_STS 0x1000 #define STDP4028_CON_STATE_CONNECTED \ (STDP4028_DPTX_HOTPLUG_STS | STDP4028_DPTX_LINK_STS) #define STDP4028_DPTX_HOTPLUG_CH_STS 0x0400 #define STDP4028_DPTX_LINK_CH_STS 0x2000 #define STDP4028_DPTX_IRQ_CLEAR \ (STDP4028_DPTX_LINK_CH_STS | STDP4028_DPTX_HOTPLUG_CH_STS) static DEFINE_MUTEX(ge_b850v3_lvds_dev_mutex); struct ge_b850v3_lvds { struct drm_connector connector; struct drm_bridge bridge; struct i2c_client *stdp4028_i2c; struct i2c_client *stdp2690_i2c; struct edid *edid; }; static struct ge_b850v3_lvds *ge_b850v3_lvds_ptr; static u8 *stdp2690_get_edid(struct i2c_client *client) { struct i2c_adapter *adapter = client->adapter; unsigned char start = 0x00; unsigned int total_size; u8 *block = kmalloc(EDID_LENGTH, GFP_KERNEL); struct i2c_msg msgs[] = { { .addr = client->addr, .flags = 0, .len = 1, .buf = &start, }, { .addr = client->addr, .flags = I2C_M_RD, .len = EDID_LENGTH, .buf = block, } }; if (!block) return NULL; if (i2c_transfer(adapter, msgs, 2) != 2) { DRM_ERROR("Unable to read EDID.\n"); goto err; } if (!drm_edid_block_valid(block, 0, false, NULL)) { DRM_ERROR("Invalid EDID data\n"); goto err; } total_size = (block[EDID_EXT_BLOCK_CNT] + 1) * EDID_LENGTH; if (total_size > EDID_LENGTH) { kfree(block); block = kmalloc(total_size, GFP_KERNEL); if (!block) return NULL; /* Yes, read the entire buffer, and do not skip the first * EDID_LENGTH bytes. */ start = 0x00; msgs[1].len = total_size; msgs[1].buf = block; if (i2c_transfer(adapter, msgs, 2) != 2) { DRM_ERROR("Unable to read EDID extension blocks.\n"); goto err; } if (!drm_edid_block_valid(block, 1, false, NULL)) { DRM_ERROR("Invalid EDID data\n"); goto err; } } return block; err: kfree(block); return NULL; } static int ge_b850v3_lvds_get_modes(struct drm_connector *connector) { struct i2c_client *client; int num_modes = 0; client = ge_b850v3_lvds_ptr->stdp2690_i2c; kfree(ge_b850v3_lvds_ptr->edid); ge_b850v3_lvds_ptr->edid = (struct edid *)stdp2690_get_edid(client); if (ge_b850v3_lvds_ptr->edid) { drm_connector_update_edid_property(connector, ge_b850v3_lvds_ptr->edid); num_modes = drm_add_edid_modes(connector, ge_b850v3_lvds_ptr->edid); } return num_modes; } static enum drm_mode_status ge_b850v3_lvds_mode_valid( struct drm_connector *connector, struct drm_display_mode *mode) { return MODE_OK; } static const struct drm_connector_helper_funcs ge_b850v3_lvds_connector_helper_funcs = { .get_modes = ge_b850v3_lvds_get_modes, .mode_valid = ge_b850v3_lvds_mode_valid, }; static enum drm_connector_status ge_b850v3_lvds_detect( struct drm_connector *connector, bool force) { struct i2c_client *stdp4028_i2c = ge_b850v3_lvds_ptr->stdp4028_i2c; s32 link_state; link_state = i2c_smbus_read_word_data(stdp4028_i2c, STDP4028_DPTX_STS_REG); if (link_state == STDP4028_CON_STATE_CONNECTED) return connector_status_connected; if (link_state == 0) return connector_status_disconnected; return connector_status_unknown; } static const struct drm_connector_funcs ge_b850v3_lvds_connector_funcs = { .fill_modes = drm_helper_probe_single_connector_modes, .detect = ge_b850v3_lvds_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 irqreturn_t ge_b850v3_lvds_irq_handler(int irq, void *dev_id) { struct i2c_client *stdp4028_i2c = ge_b850v3_lvds_ptr->stdp4028_i2c; i2c_smbus_write_word_data(stdp4028_i2c, STDP4028_DPTX_IRQ_STS_REG, STDP4028_DPTX_IRQ_CLEAR); if (ge_b850v3_lvds_ptr->connector.dev) drm_kms_helper_hotplug_event(ge_b850v3_lvds_ptr->connector.dev); return IRQ_HANDLED; } static int ge_b850v3_lvds_attach(struct drm_bridge *bridge, enum drm_bridge_attach_flags flags) { struct drm_connector *connector = &ge_b850v3_lvds_ptr->connector; struct i2c_client *stdp4028_i2c = ge_b850v3_lvds_ptr->stdp4028_i2c; int ret; if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) { DRM_ERROR("Fix bridge driver to make connector optional!"); return -EINVAL; } if (!bridge->encoder) { DRM_ERROR("Parent encoder object not found"); return -ENODEV; } connector->polled = DRM_CONNECTOR_POLL_HPD; drm_connector_helper_add(connector, &ge_b850v3_lvds_connector_helper_funcs); ret = drm_connector_init(bridge->dev, connector, &ge_b850v3_lvds_connector_funcs, DRM_MODE_CONNECTOR_DisplayPort); if (ret) { DRM_ERROR("Failed to initialize connector with drm\n"); return ret; } ret = drm_connector_attach_encoder(connector, bridge->encoder); if (ret) return ret; /* Configures the bridge to re-enable interrupts after each ack. */ i2c_smbus_write_word_data(stdp4028_i2c, STDP4028_IRQ_OUT_CONF_REG, STDP4028_DPTX_DP_IRQ_EN); /* Enable interrupts */ i2c_smbus_write_word_data(stdp4028_i2c, STDP4028_DPTX_IRQ_EN_REG, STDP4028_DPTX_IRQ_CONFIG); return 0; } static const struct drm_bridge_funcs ge_b850v3_lvds_funcs = { .attach = ge_b850v3_lvds_attach, }; static int ge_b850v3_lvds_init(struct device *dev) { mutex_lock(&ge_b850v3_lvds_dev_mutex); if (ge_b850v3_lvds_ptr) goto success; ge_b850v3_lvds_ptr = devm_kzalloc(dev, sizeof(*ge_b850v3_lvds_ptr), GFP_KERNEL); if (!ge_b850v3_lvds_ptr) { mutex_unlock(&ge_b850v3_lvds_dev_mutex); return -ENOMEM; } success: mutex_unlock(&ge_b850v3_lvds_dev_mutex); return 0; } static void ge_b850v3_lvds_remove(void) { mutex_lock(&ge_b850v3_lvds_dev_mutex); /* * This check is to avoid both the drivers * removing the bridge in their remove() function */ if (!ge_b850v3_lvds_ptr) goto out; drm_bridge_remove(&ge_b850v3_lvds_ptr->bridge); kfree(ge_b850v3_lvds_ptr->edid); ge_b850v3_lvds_ptr = NULL; out: mutex_unlock(&ge_b850v3_lvds_dev_mutex); } static int stdp4028_ge_b850v3_fw_probe(struct i2c_client *stdp4028_i2c, const struct i2c_device_id *id) { struct device *dev = &stdp4028_i2c->dev; ge_b850v3_lvds_init(dev); ge_b850v3_lvds_ptr->stdp4028_i2c = stdp4028_i2c; i2c_set_clientdata(stdp4028_i2c, ge_b850v3_lvds_ptr); /* drm bridge initialization */ ge_b850v3_lvds_ptr->bridge.funcs = &ge_b850v3_lvds_funcs; ge_b850v3_lvds_ptr->bridge.of_node = dev->of_node; drm_bridge_add(&ge_b850v3_lvds_ptr->bridge); /* Clear pending interrupts since power up. */ i2c_smbus_write_word_data(stdp4028_i2c, STDP4028_DPTX_IRQ_STS_REG, STDP4028_DPTX_IRQ_CLEAR); if (!stdp4028_i2c->irq) return 0; return devm_request_threaded_irq(&stdp4028_i2c->dev, stdp4028_i2c->irq, NULL, ge_b850v3_lvds_irq_handler, IRQF_TRIGGER_HIGH | IRQF_ONESHOT, "ge-b850v3-lvds-dp", ge_b850v3_lvds_ptr); } static int stdp4028_ge_b850v3_fw_remove(struct i2c_client *stdp4028_i2c) { ge_b850v3_lvds_remove(); return 0; } static const struct i2c_device_id stdp4028_ge_b850v3_fw_i2c_table[] = { {"stdp4028_ge_fw", 0}, {}, }; MODULE_DEVICE_TABLE(i2c, stdp4028_ge_b850v3_fw_i2c_table); static const struct of_device_id stdp4028_ge_b850v3_fw_match[] = { { .compatible = "megachips,stdp4028-ge-b850v3-fw" }, {}, }; MODULE_DEVICE_TABLE(of, stdp4028_ge_b850v3_fw_match); static struct i2c_driver stdp4028_ge_b850v3_fw_driver = { .id_table = stdp4028_ge_b850v3_fw_i2c_table, .probe = stdp4028_ge_b850v3_fw_probe, .remove = stdp4028_ge_b850v3_fw_remove, .driver = { .name = "stdp4028-ge-b850v3-fw", .of_match_table = stdp4028_ge_b850v3_fw_match, }, }; static int stdp2690_ge_b850v3_fw_probe(struct i2c_client *stdp2690_i2c, const struct i2c_device_id *id) { struct device *dev = &stdp2690_i2c->dev; ge_b850v3_lvds_init(dev); ge_b850v3_lvds_ptr->stdp2690_i2c = stdp2690_i2c; i2c_set_clientdata(stdp2690_i2c, ge_b850v3_lvds_ptr); return 0; } static int stdp2690_ge_b850v3_fw_remove(struct i2c_client *stdp2690_i2c) { ge_b850v3_lvds_remove(); return 0; } static const struct i2c_device_id stdp2690_ge_b850v3_fw_i2c_table[] = { {"stdp2690_ge_fw", 0}, {}, }; MODULE_DEVICE_TABLE(i2c, stdp2690_ge_b850v3_fw_i2c_table); static const struct of_device_id stdp2690_ge_b850v3_fw_match[] = { { .compatible = "megachips,stdp2690-ge-b850v3-fw" }, {}, }; MODULE_DEVICE_TABLE(of, stdp2690_ge_b850v3_fw_match); static struct i2c_driver stdp2690_ge_b850v3_fw_driver = { .id_table = stdp2690_ge_b850v3_fw_i2c_table, .probe = stdp2690_ge_b850v3_fw_probe, .remove = stdp2690_ge_b850v3_fw_remove, .driver = { .name = "stdp2690-ge-b850v3-fw", .of_match_table = stdp2690_ge_b850v3_fw_match, }, }; static int __init stdpxxxx_ge_b850v3_init(void) { int ret; ret = i2c_add_driver(&stdp4028_ge_b850v3_fw_driver); if (ret) return ret; return i2c_add_driver(&stdp2690_ge_b850v3_fw_driver); } module_init(stdpxxxx_ge_b850v3_init); static void __exit stdpxxxx_ge_b850v3_exit(void) { i2c_del_driver(&stdp2690_ge_b850v3_fw_driver); i2c_del_driver(&stdp4028_ge_b850v3_fw_driver); } module_exit(stdpxxxx_ge_b850v3_exit); MODULE_AUTHOR("Peter Senna Tschudin <peter.senna@collabora.com>"); MODULE_AUTHOR("Martyn Welch <martyn.welch@collabora.co.uk>"); MODULE_DESCRIPTION("GE LVDS to DP++ display bridge)"); MODULE_LICENSE("GPL v2");
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