diff options
Diffstat (limited to 'drivers/gpu/drm')
-rw-r--r-- | drivers/gpu/drm/bridge/Kconfig | 11 | ||||
-rw-r--r-- | drivers/gpu/drm/bridge/Makefile | 1 | ||||
-rw-r--r-- | drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c | 428 |
3 files changed, 440 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig index eb8688e..4a937f1 100644 --- a/drivers/gpu/drm/bridge/Kconfig +++ b/drivers/gpu/drm/bridge/Kconfig @@ -48,6 +48,17 @@ config DRM_DW_HDMI_I2S_AUDIO Support the I2S Audio interface which is part of the Synopsis Designware HDMI block. +config DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW + tristate "MegaChips stdp4028-ge-b850v3-fw and stdp2690-ge-b850v3-fw" + depends on OF + select DRM_KMS_HELPER + select DRM_PANEL + ---help--- + This is a driver for the display bridges of + GE B850v3 that convert dual channel LVDS + to DP++. This is used with the i.MX6 imx-ldb + driver. You are likely to say N here. + config DRM_NXP_PTN3460 tristate "NXP PTN3460 DP/LVDS bridge" depends on OF diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile index 2e83a785..af0b7cc 100644 --- a/drivers/gpu/drm/bridge/Makefile +++ b/drivers/gpu/drm/bridge/Makefile @@ -5,6 +5,7 @@ obj-$(CONFIG_DRM_DUMB_VGA_DAC) += dumb-vga-dac.o obj-$(CONFIG_DRM_DW_HDMI) += dw-hdmi.o obj-$(CONFIG_DRM_DW_HDMI_AHB_AUDIO) += dw-hdmi-ahb-audio.o obj-$(CONFIG_DRM_DW_HDMI_I2S_AUDIO) += dw-hdmi-i2s-audio.o +obj-$(CONFIG_DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW) += megachips-stdpxxxx-ge-b850v3-fw.o obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o obj-$(CONFIG_DRM_PARADE_PS8622) += parade-ps8622.o obj-$(CONFIG_DRM_SIL_SII8620) += sil-sii8620.o diff --git a/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c b/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c new file mode 100644 index 0000000..cfc606a --- /dev/null +++ b/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c @@ -0,0 +1,428 @@ +/* + * 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 program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + + * 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/gpio.h> +#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_crtc_helper.h> +#include <drm/drm_edid.h> +#include <drm/drmP.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_mode_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 = { + .dpms = drm_atomic_helper_connector_dpms, + .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) +{ + struct drm_connector *connector = &ge_b850v3_lvds_ptr->connector; + struct i2c_client *stdp4028_i2c + = ge_b850v3_lvds_ptr->stdp4028_i2c; + int ret; + + 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_mode_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; + } + + 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); + +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); + + /* 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"); |