diff options
Diffstat (limited to 'drivers/video/omap2/displays/panel-taal.c')
| -rw-r--r-- | drivers/video/omap2/displays/panel-taal.c | 1551 |
1 files changed, 1551 insertions, 0 deletions
diff --git a/drivers/video/omap2/displays/panel-taal.c b/drivers/video/omap2/displays/panel-taal.c new file mode 100644 index 00000000..c4f78bda --- /dev/null +++ b/drivers/video/omap2/displays/panel-taal.c @@ -0,0 +1,1551 @@ +/* + * Taal DSI command mode panel + * + * Copyright (C) 2009 Nokia Corporation + * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that 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/>. + */ + +/*#define DEBUG*/ + +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/jiffies.h> +#include <linux/sched.h> +#include <linux/backlight.h> +#include <linux/fb.h> +#include <linux/interrupt.h> +#include <linux/gpio.h> +#include <linux/workqueue.h> +#include <linux/slab.h> +#include <linux/mutex.h> + +#include <video/omapdss.h> +#include <video/omap-panel-data.h> +#include <video/mipi_display.h> + +/* DSI Virtual channel. Hardcoded for now. */ +#define TCH 0 + +#define DCS_READ_NUM_ERRORS 0x05 +#define DCS_BRIGHTNESS 0x51 +#define DCS_CTRL_DISPLAY 0x53 +#define DCS_WRITE_CABC 0x55 +#define DCS_READ_CABC 0x56 +#define DCS_GET_ID1 0xda +#define DCS_GET_ID2 0xdb +#define DCS_GET_ID3 0xdc + +static irqreturn_t taal_te_isr(int irq, void *data); +static void taal_te_timeout_work_callback(struct work_struct *work); +static int _taal_enable_te(struct omap_dss_device *dssdev, bool enable); + +static int taal_panel_reset(struct omap_dss_device *dssdev); + +struct taal_data { + struct mutex lock; + + struct backlight_device *bldev; + + unsigned long hw_guard_end; /* next value of jiffies when we can + * issue the next sleep in/out command + */ + unsigned long hw_guard_wait; /* max guard time in jiffies */ + + struct omap_dss_device *dssdev; + + /* panel HW configuration from DT or platform data */ + int reset_gpio; + int ext_te_gpio; + + bool use_dsi_backlight; + + struct omap_dsi_pin_config pin_config; + + /* runtime variables */ + bool enabled; + + bool te_enabled; + + atomic_t do_update; + int channel; + + struct delayed_work te_timeout_work; + + bool cabc_broken; + unsigned cabc_mode; + + bool intro_printed; + + struct workqueue_struct *workqueue; + + struct delayed_work esd_work; + unsigned esd_interval; + + bool ulps_enabled; + unsigned ulps_timeout; + struct delayed_work ulps_work; +}; + +static void taal_esd_work(struct work_struct *work); +static void taal_ulps_work(struct work_struct *work); + +static void hw_guard_start(struct taal_data *td, int guard_msec) +{ + td->hw_guard_wait = msecs_to_jiffies(guard_msec); + td->hw_guard_end = jiffies + td->hw_guard_wait; +} + +static void hw_guard_wait(struct taal_data *td) +{ + unsigned long wait = td->hw_guard_end - jiffies; + + if ((long)wait > 0 && wait <= td->hw_guard_wait) { + set_current_state(TASK_UNINTERRUPTIBLE); + schedule_timeout(wait); + } +} + +static int taal_dcs_read_1(struct taal_data *td, u8 dcs_cmd, u8 *data) +{ + int r; + u8 buf[1]; + + r = dsi_vc_dcs_read(td->dssdev, td->channel, dcs_cmd, buf, 1); + + if (r < 0) + return r; + + *data = buf[0]; + + return 0; +} + +static int taal_dcs_write_0(struct taal_data *td, u8 dcs_cmd) +{ + return dsi_vc_dcs_write(td->dssdev, td->channel, &dcs_cmd, 1); +} + +static int taal_dcs_write_1(struct taal_data *td, u8 dcs_cmd, u8 param) +{ + u8 buf[2]; + buf[0] = dcs_cmd; + buf[1] = param; + return dsi_vc_dcs_write(td->dssdev, td->channel, buf, 2); +} + +static int taal_sleep_in(struct taal_data *td) + +{ + u8 cmd; + int r; + + hw_guard_wait(td); + + cmd = MIPI_DCS_ENTER_SLEEP_MODE; + r = dsi_vc_dcs_write_nosync(td->dssdev, td->channel, &cmd, 1); + if (r) + return r; + + hw_guard_start(td, 120); + + msleep(5); + + return 0; +} + +static int taal_sleep_out(struct taal_data *td) +{ + int r; + + hw_guard_wait(td); + + r = taal_dcs_write_0(td, MIPI_DCS_EXIT_SLEEP_MODE); + if (r) + return r; + + hw_guard_start(td, 120); + + msleep(5); + + return 0; +} + +static int taal_get_id(struct taal_data *td, u8 *id1, u8 *id2, u8 *id3) +{ + int r; + + r = taal_dcs_read_1(td, DCS_GET_ID1, id1); + if (r) + return r; + r = taal_dcs_read_1(td, DCS_GET_ID2, id2); + if (r) + return r; + r = taal_dcs_read_1(td, DCS_GET_ID3, id3); + if (r) + return r; + + return 0; +} + +static int taal_set_update_window(struct taal_data *td, + u16 x, u16 y, u16 w, u16 h) +{ + int r; + u16 x1 = x; + u16 x2 = x + w - 1; + u16 y1 = y; + u16 y2 = y + h - 1; + + u8 buf[5]; + buf[0] = MIPI_DCS_SET_COLUMN_ADDRESS; + buf[1] = (x1 >> 8) & 0xff; + buf[2] = (x1 >> 0) & 0xff; + buf[3] = (x2 >> 8) & 0xff; + buf[4] = (x2 >> 0) & 0xff; + + r = dsi_vc_dcs_write_nosync(td->dssdev, td->channel, buf, sizeof(buf)); + if (r) + return r; + + buf[0] = MIPI_DCS_SET_PAGE_ADDRESS; + buf[1] = (y1 >> 8) & 0xff; + buf[2] = (y1 >> 0) & 0xff; + buf[3] = (y2 >> 8) & 0xff; + buf[4] = (y2 >> 0) & 0xff; + + r = dsi_vc_dcs_write_nosync(td->dssdev, td->channel, buf, sizeof(buf)); + if (r) + return r; + + dsi_vc_send_bta_sync(td->dssdev, td->channel); + + return r; +} + +static void taal_queue_esd_work(struct omap_dss_device *dssdev) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + + if (td->esd_interval > 0) + queue_delayed_work(td->workqueue, &td->esd_work, + msecs_to_jiffies(td->esd_interval)); +} + +static void taal_cancel_esd_work(struct omap_dss_device *dssdev) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + + cancel_delayed_work(&td->esd_work); +} + +static void taal_queue_ulps_work(struct omap_dss_device *dssdev) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + + if (td->ulps_timeout > 0) + queue_delayed_work(td->workqueue, &td->ulps_work, + msecs_to_jiffies(td->ulps_timeout)); +} + +static void taal_cancel_ulps_work(struct omap_dss_device *dssdev) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + + cancel_delayed_work(&td->ulps_work); +} + +static int taal_enter_ulps(struct omap_dss_device *dssdev) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + int r; + + if (td->ulps_enabled) + return 0; + + taal_cancel_ulps_work(dssdev); + + r = _taal_enable_te(dssdev, false); + if (r) + goto err; + + if (gpio_is_valid(td->ext_te_gpio)) + disable_irq(gpio_to_irq(td->ext_te_gpio)); + + omapdss_dsi_display_disable(dssdev, false, true); + + td->ulps_enabled = true; + + return 0; + +err: + dev_err(&dssdev->dev, "enter ULPS failed"); + taal_panel_reset(dssdev); + + td->ulps_enabled = false; + + taal_queue_ulps_work(dssdev); + + return r; +} + +static int taal_exit_ulps(struct omap_dss_device *dssdev) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + int r; + + if (!td->ulps_enabled) + return 0; + + r = omapdss_dsi_display_enable(dssdev); + if (r) { + dev_err(&dssdev->dev, "failed to enable DSI\n"); + goto err1; + } + + omapdss_dsi_vc_enable_hs(dssdev, td->channel, true); + + r = _taal_enable_te(dssdev, true); + if (r) { + dev_err(&dssdev->dev, "failed to re-enable TE"); + goto err2; + } + + if (gpio_is_valid(td->ext_te_gpio)) + enable_irq(gpio_to_irq(td->ext_te_gpio)); + + taal_queue_ulps_work(dssdev); + + td->ulps_enabled = false; + + return 0; + +err2: + dev_err(&dssdev->dev, "failed to exit ULPS"); + + r = taal_panel_reset(dssdev); + if (!r) { + if (gpio_is_valid(td->ext_te_gpio)) + enable_irq(gpio_to_irq(td->ext_te_gpio)); + td->ulps_enabled = false; + } +err1: + taal_queue_ulps_work(dssdev); + + return r; +} + +static int taal_wake_up(struct omap_dss_device *dssdev) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + + if (td->ulps_enabled) + return taal_exit_ulps(dssdev); + + taal_cancel_ulps_work(dssdev); + taal_queue_ulps_work(dssdev); + return 0; +} + +static int taal_bl_update_status(struct backlight_device *dev) +{ + struct omap_dss_device *dssdev = dev_get_drvdata(&dev->dev); + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + int r; + int level; + + if (dev->props.fb_blank == FB_BLANK_UNBLANK && + dev->props.power == FB_BLANK_UNBLANK) + level = dev->props.brightness; + else + level = 0; + + dev_dbg(&dssdev->dev, "update brightness to %d\n", level); + + mutex_lock(&td->lock); + + if (td->enabled) { + dsi_bus_lock(dssdev); + + r = taal_wake_up(dssdev); + if (!r) + r = taal_dcs_write_1(td, DCS_BRIGHTNESS, level); + + dsi_bus_unlock(dssdev); + } else { + r = 0; + } + + mutex_unlock(&td->lock); + + return r; +} + +static int taal_bl_get_intensity(struct backlight_device *dev) +{ + if (dev->props.fb_blank == FB_BLANK_UNBLANK && + dev->props.power == FB_BLANK_UNBLANK) + return dev->props.brightness; + + return 0; +} + +static const struct backlight_ops taal_bl_ops = { + .get_brightness = taal_bl_get_intensity, + .update_status = taal_bl_update_status, +}; + +static void taal_get_resolution(struct omap_dss_device *dssdev, + u16 *xres, u16 *yres) +{ + *xres = dssdev->panel.timings.x_res; + *yres = dssdev->panel.timings.y_res; +} + +static ssize_t taal_num_errors_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct omap_dss_device *dssdev = to_dss_device(dev); + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + u8 errors = 0; + int r; + + mutex_lock(&td->lock); + + if (td->enabled) { + dsi_bus_lock(dssdev); + + r = taal_wake_up(dssdev); + if (!r) + r = taal_dcs_read_1(td, DCS_READ_NUM_ERRORS, &errors); + + dsi_bus_unlock(dssdev); + } else { + r = -ENODEV; + } + + mutex_unlock(&td->lock); + + if (r) + return r; + + return snprintf(buf, PAGE_SIZE, "%d\n", errors); +} + +static ssize_t taal_hw_revision_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct omap_dss_device *dssdev = to_dss_device(dev); + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + u8 id1, id2, id3; + int r; + + mutex_lock(&td->lock); + + if (td->enabled) { + dsi_bus_lock(dssdev); + + r = taal_wake_up(dssdev); + if (!r) + r = taal_get_id(td, &id1, &id2, &id3); + + dsi_bus_unlock(dssdev); + } else { + r = -ENODEV; + } + + mutex_unlock(&td->lock); + + if (r) + return r; + + return snprintf(buf, PAGE_SIZE, "%02x.%02x.%02x\n", id1, id2, id3); +} + +static const char *cabc_modes[] = { + "off", /* used also always when CABC is not supported */ + "ui", + "still-image", + "moving-image", +}; + +static ssize_t show_cabc_mode(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct omap_dss_device *dssdev = to_dss_device(dev); + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + const char *mode_str; + int mode; + int len; + + mode = td->cabc_mode; + + mode_str = "unknown"; + if (mode >= 0 && mode < ARRAY_SIZE(cabc_modes)) + mode_str = cabc_modes[mode]; + len = snprintf(buf, PAGE_SIZE, "%s\n", mode_str); + + return len < PAGE_SIZE - 1 ? len : PAGE_SIZE - 1; +} + +static ssize_t store_cabc_mode(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct omap_dss_device *dssdev = to_dss_device(dev); + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + int i; + int r; + + for (i = 0; i < ARRAY_SIZE(cabc_modes); i++) { + if (sysfs_streq(cabc_modes[i], buf)) + break; + } + + if (i == ARRAY_SIZE(cabc_modes)) + return -EINVAL; + + mutex_lock(&td->lock); + + if (td->enabled) { + dsi_bus_lock(dssdev); + + if (!td->cabc_broken) { + r = taal_wake_up(dssdev); + if (r) + goto err; + + r = taal_dcs_write_1(td, DCS_WRITE_CABC, i); + if (r) + goto err; + } + + dsi_bus_unlock(dssdev); + } + + td->cabc_mode = i; + + mutex_unlock(&td->lock); + + return count; +err: + dsi_bus_unlock(dssdev); + mutex_unlock(&td->lock); + return r; +} + +static ssize_t show_cabc_available_modes(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int len; + int i; + + for (i = 0, len = 0; + len < PAGE_SIZE && i < ARRAY_SIZE(cabc_modes); i++) + len += snprintf(&buf[len], PAGE_SIZE - len, "%s%s%s", + i ? " " : "", cabc_modes[i], + i == ARRAY_SIZE(cabc_modes) - 1 ? "\n" : ""); + + return len < PAGE_SIZE ? len : PAGE_SIZE - 1; +} + +static ssize_t taal_store_esd_interval(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct omap_dss_device *dssdev = to_dss_device(dev); + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + + unsigned long t; + int r; + + r = strict_strtoul(buf, 10, &t); + if (r) + return r; + + mutex_lock(&td->lock); + taal_cancel_esd_work(dssdev); + td->esd_interval = t; + if (td->enabled) + taal_queue_esd_work(dssdev); + mutex_unlock(&td->lock); + + return count; +} + +static ssize_t taal_show_esd_interval(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct omap_dss_device *dssdev = to_dss_device(dev); + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + unsigned t; + + mutex_lock(&td->lock); + t = td->esd_interval; + mutex_unlock(&td->lock); + + return snprintf(buf, PAGE_SIZE, "%u\n", t); +} + +static ssize_t taal_store_ulps(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct omap_dss_device *dssdev = to_dss_device(dev); + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + unsigned long t; + int r; + + r = strict_strtoul(buf, 10, &t); + if (r) + return r; + + mutex_lock(&td->lock); + + if (td->enabled) { + dsi_bus_lock(dssdev); + + if (t) + r = taal_enter_ulps(dssdev); + else + r = taal_wake_up(dssdev); + + dsi_bus_unlock(dssdev); + } + + mutex_unlock(&td->lock); + + if (r) + return r; + + return count; +} + +static ssize_t taal_show_ulps(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct omap_dss_device *dssdev = to_dss_device(dev); + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + unsigned t; + + mutex_lock(&td->lock); + t = td->ulps_enabled; + mutex_unlock(&td->lock); + + return snprintf(buf, PAGE_SIZE, "%u\n", t); +} + +static ssize_t taal_store_ulps_timeout(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct omap_dss_device *dssdev = to_dss_device(dev); + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + unsigned long t; + int r; + + r = strict_strtoul(buf, 10, &t); + if (r) + return r; + + mutex_lock(&td->lock); + td->ulps_timeout = t; + + if (td->enabled) { + /* taal_wake_up will restart the timer */ + dsi_bus_lock(dssdev); + r = taal_wake_up(dssdev); + dsi_bus_unlock(dssdev); + } + + mutex_unlock(&td->lock); + + if (r) + return r; + + return count; +} + +static ssize_t taal_show_ulps_timeout(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct omap_dss_device *dssdev = to_dss_device(dev); + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + unsigned t; + + mutex_lock(&td->lock); + t = td->ulps_timeout; + mutex_unlock(&td->lock); + + return snprintf(buf, PAGE_SIZE, "%u\n", t); +} + +static DEVICE_ATTR(num_dsi_errors, S_IRUGO, taal_num_errors_show, NULL); +static DEVICE_ATTR(hw_revision, S_IRUGO, taal_hw_revision_show, NULL); +static DEVICE_ATTR(cabc_mode, S_IRUGO | S_IWUSR, + show_cabc_mode, store_cabc_mode); +static DEVICE_ATTR(cabc_available_modes, S_IRUGO, + show_cabc_available_modes, NULL); +static DEVICE_ATTR(esd_interval, S_IRUGO | S_IWUSR, + taal_show_esd_interval, taal_store_esd_interval); +static DEVICE_ATTR(ulps, S_IRUGO | S_IWUSR, + taal_show_ulps, taal_store_ulps); +static DEVICE_ATTR(ulps_timeout, S_IRUGO | S_IWUSR, + taal_show_ulps_timeout, taal_store_ulps_timeout); + +static struct attribute *taal_attrs[] = { + &dev_attr_num_dsi_errors.attr, + &dev_attr_hw_revision.attr, + &dev_attr_cabc_mode.attr, + &dev_attr_cabc_available_modes.attr, + &dev_attr_esd_interval.attr, + &dev_attr_ulps.attr, + &dev_attr_ulps_timeout.attr, + NULL, +}; + +static struct attribute_group taal_attr_group = { + .attrs = taal_attrs, +}; + +static void taal_hw_reset(struct omap_dss_device *dssdev) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + + if (!gpio_is_valid(td->reset_gpio)) + return; + + gpio_set_value(td->reset_gpio, 1); + udelay(10); + /* reset the panel */ + gpio_set_value(td->reset_gpio, 0); + /* assert reset */ + udelay(10); + gpio_set_value(td->reset_gpio, 1); + /* wait after releasing reset */ + msleep(5); +} + +static void taal_probe_pdata(struct taal_data *td, + const struct nokia_dsi_panel_data *pdata) +{ + td->reset_gpio = pdata->reset_gpio; + + if (pdata->use_ext_te) + td->ext_te_gpio = pdata->ext_te_gpio; + else + td->ext_te_gpio = -1; + + td->esd_interval = pdata->esd_interval; + td->ulps_timeout = pdata->ulps_timeout; + + td->use_dsi_backlight = pdata->use_dsi_backlight; + + td->pin_config = pdata->pin_config; +} + +static int taal_probe(struct omap_dss_device *dssdev) +{ + struct backlight_properties props; + struct taal_data *td; + struct backlight_device *bldev = NULL; + int r; + + dev_dbg(&dssdev->dev, "probe\n"); + + td = devm_kzalloc(&dssdev->dev, sizeof(*td), GFP_KERNEL); + if (!td) + return -ENOMEM; + + dev_set_drvdata(&dssdev->dev, td); + td->dssdev = dssdev; + + if (dssdev->data) { + const struct nokia_dsi_panel_data *pdata = dssdev->data; + + taal_probe_pdata(td, pdata); + } else { + return -ENODEV; + } + + dssdev->panel.timings.x_res = 864; + dssdev->panel.timings.y_res = 480; + dssdev->panel.timings.pixel_clock = DIV_ROUND_UP(864 * 480 * 60, 1000); + dssdev->panel.dsi_pix_fmt = OMAP_DSS_DSI_FMT_RGB888; + dssdev->caps = OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE | + OMAP_DSS_DISPLAY_CAP_TEAR_ELIM; + + mutex_init(&td->lock); + + atomic_set(&td->do_update, 0); + + if (gpio_is_valid(td->reset_gpio)) { + r = devm_gpio_request_one(&dssdev->dev, td->reset_gpio, + GPIOF_OUT_INIT_LOW, "taal rst"); + if (r) { + dev_err(&dssdev->dev, "failed to request reset gpio\n"); + return r; + } + } + + if (gpio_is_valid(td->ext_te_gpio)) { + r = devm_gpio_request_one(&dssdev->dev, td->ext_te_gpio, + GPIOF_IN, "taal irq"); + if (r) { + dev_err(&dssdev->dev, "GPIO request failed\n"); + return r; + } + + r = devm_request_irq(&dssdev->dev, gpio_to_irq(td->ext_te_gpio), + taal_te_isr, + IRQF_TRIGGER_RISING, + "taal vsync", dssdev); + + if (r) { + dev_err(&dssdev->dev, "IRQ request failed\n"); + return r; + } + + INIT_DEFERRABLE_WORK(&td->te_timeout_work, + taal_te_timeout_work_callback); + + dev_dbg(&dssdev->dev, "Using GPIO TE\n"); + } + + td->workqueue = create_singlethread_workqueue("taal_esd"); + if (td->workqueue == NULL) { + dev_err(&dssdev->dev, "can't create ESD workqueue\n"); + return -ENOMEM; + } + INIT_DEFERRABLE_WORK(&td->esd_work, taal_esd_work); + INIT_DELAYED_WORK(&td->ulps_work, taal_ulps_work); + + taal_hw_reset(dssdev); + + if (td->use_dsi_backlight) { + memset(&props, 0, sizeof(struct backlight_properties)); + props.max_brightness = 255; + + props.type = BACKLIGHT_RAW; + bldev = backlight_device_register(dev_name(&dssdev->dev), + &dssdev->dev, dssdev, &taal_bl_ops, &props); + if (IS_ERR(bldev)) { + r = PTR_ERR(bldev); + goto err_bl; + } + + td->bldev = bldev; + + bldev->props.fb_blank = FB_BLANK_UNBLANK; + bldev->props.power = FB_BLANK_UNBLANK; + bldev->props.brightness = 255; + + taal_bl_update_status(bldev); + } + + r = omap_dsi_request_vc(dssdev, &td->channel); + if (r) { + dev_err(&dssdev->dev, "failed to get virtual channel\n"); + goto err_req_vc; + } + + r = omap_dsi_set_vc_id(dssdev, td->channel, TCH); + if (r) { + dev_err(&dssdev->dev, "failed to set VC_ID\n"); + goto err_vc_id; + } + + r = sysfs_create_group(&dssdev->dev.kobj, &taal_attr_group); + if (r) { + dev_err(&dssdev->dev, "failed to create sysfs files\n"); + goto err_vc_id; + } + + return 0; + +err_vc_id: + omap_dsi_release_vc(dssdev, td->channel); +err_req_vc: + if (bldev != NULL) + backlight_device_unregister(bldev); +err_bl: + destroy_workqueue(td->workqueue); + return r; +} + +static void __exit taal_remove(struct omap_dss_device *dssdev) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + struct backlight_device *bldev; + + dev_dbg(&dssdev->dev, "remove\n"); + + sysfs_remove_group(&dssdev->dev.kobj, &taal_attr_group); + omap_dsi_release_vc(dssdev, td->channel); + + bldev = td->bldev; + if (bldev != NULL) { + bldev->props.power = FB_BLANK_POWERDOWN; + taal_bl_update_status(bldev); + backlight_device_unregister(bldev); + } + + taal_cancel_ulps_work(dssdev); + taal_cancel_esd_work(dssdev); + destroy_workqueue(td->workqueue); + + /* reset, to be sure that the panel is in a valid state */ + taal_hw_reset(dssdev); +} + +static int taal_power_on(struct omap_dss_device *dssdev) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + u8 id1, id2, id3; + int r; + struct omap_dss_dsi_config dsi_config = { + .mode = OMAP_DSS_DSI_CMD_MODE, + .pixel_format = OMAP_DSS_DSI_FMT_RGB888, + .timings = &dssdev->panel.timings, + .hs_clk_min = 150000000, + .hs_clk_max = 300000000, + .lp_clk_min = 7000000, + .lp_clk_max = 10000000, + }; + + r = omapdss_dsi_configure_pins(dssdev, &td->pin_config); + if (r) { + dev_err(&dssdev->dev, "failed to configure DSI pins\n"); + goto err0; + }; + + r = omapdss_dsi_set_config(dssdev, &dsi_config); + if (r) { + dev_err(&dssdev->dev, "failed to configure DSI\n"); + goto err0; + } + + r = omapdss_dsi_display_enable(dssdev); + if (r) { + dev_err(&dssdev->dev, "failed to enable DSI\n"); + goto err0; + } + + taal_hw_reset(dssdev); + + omapdss_dsi_vc_enable_hs(dssdev, td->channel, false); + + r = taal_sleep_out(td); + if (r) + goto err; + + r = taal_get_id(td, &id1, &id2, &id3); + if (r) + goto err; + + /* on early Taal revisions CABC is broken */ + if (id2 == 0x00 || id2 == 0xff || id2 == 0x81) + td->cabc_broken = true; + + r = taal_dcs_write_1(td, DCS_BRIGHTNESS, 0xff); + if (r) + goto err; + + r = taal_dcs_write_1(td, DCS_CTRL_DISPLAY, + (1<<2) | (1<<5)); /* BL | BCTRL */ + if (r) + goto err; + + r = taal_dcs_write_1(td, MIPI_DCS_SET_PIXEL_FORMAT, + MIPI_DCS_PIXEL_FMT_24BIT); + if (r) + goto err; + + if (!td->cabc_broken) { + r = taal_dcs_write_1(td, DCS_WRITE_CABC, td->cabc_mode); + if (r) + goto err; + } + + r = taal_dcs_write_0(td, MIPI_DCS_SET_DISPLAY_ON); + if (r) + goto err; + + r = _taal_enable_te(dssdev, td->te_enabled); + if (r) + goto err; + + r = dsi_enable_video_output(dssdev, td->channel); + if (r) + goto err; + + td->enabled = 1; + + if (!td->intro_printed) { + dev_info(&dssdev->dev, "panel revision %02x.%02x.%02x\n", + id1, id2, id3); + if (td->cabc_broken) + dev_info(&dssdev->dev, + "old Taal version, CABC disabled\n"); + td->intro_printed = true; + } + + omapdss_dsi_vc_enable_hs(dssdev, td->channel, true); + + return 0; +err: + dev_err(&dssdev->dev, "error while enabling panel, issuing HW reset\n"); + + taal_hw_reset(dssdev); + + omapdss_dsi_display_disable(dssdev, true, false); +err0: + return r; +} + +static void taal_power_off(struct omap_dss_device *dssdev) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + int r; + + dsi_disable_video_output(dssdev, td->channel); + + r = taal_dcs_write_0(td, MIPI_DCS_SET_DISPLAY_OFF); + if (!r) + r = taal_sleep_in(td); + + if (r) { + dev_err(&dssdev->dev, + "error disabling panel, issuing HW reset\n"); + taal_hw_reset(dssdev); + } + + omapdss_dsi_display_disable(dssdev, true, false); + + td->enabled = 0; +} + +static int taal_panel_reset(struct omap_dss_device *dssdev) +{ + dev_err(&dssdev->dev, "performing LCD reset\n"); + + taal_power_off(dssdev); + taal_hw_reset(dssdev); + return taal_power_on(dssdev); +} + +static int taal_enable(struct omap_dss_device *dssdev) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + int r; + + dev_dbg(&dssdev->dev, "enable\n"); + + mutex_lock(&td->lock); + + if (dssdev->state != OMAP_DSS_DISPLAY_DISABLED) { + r = -EINVAL; + goto err; + } + + dsi_bus_lock(dssdev); + + r = taal_power_on(dssdev); + + dsi_bus_unlock(dssdev); + + if (r) + goto err; + + taal_queue_esd_work(dssdev); + + dssdev->state = OMAP_DSS_DISPLAY_ACTIVE; + + mutex_unlock(&td->lock); + + return 0; +err: + dev_dbg(&dssdev->dev, "enable failed\n"); + mutex_unlock(&td->lock); + return r; +} + +static void taal_disable(struct omap_dss_device *dssdev) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + + dev_dbg(&dssdev->dev, "disable\n"); + + mutex_lock(&td->lock); + + taal_cancel_ulps_work(dssdev); + taal_cancel_esd_work(dssdev); + + dsi_bus_lock(dssdev); + + if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) { + int r; + + r = taal_wake_up(dssdev); + if (!r) + taal_power_off(dssdev); + } + + dsi_bus_unlock(dssdev); + + dssdev->state = OMAP_DSS_DISPLAY_DISABLED; + + mutex_unlock(&td->lock); +} + +static void taal_framedone_cb(int err, void *data) +{ + struct omap_dss_device *dssdev = data; + dev_dbg(&dssdev->dev, "framedone, err %d\n", err); + dsi_bus_unlock(dssdev); +} + +static irqreturn_t taal_te_isr(int irq, void *data) +{ + struct omap_dss_device *dssdev = data; + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + int old; + int r; + + old = atomic_cmpxchg(&td->do_update, 1, 0); + + if (old) { + cancel_delayed_work(&td->te_timeout_work); + + r = omap_dsi_update(dssdev, td->channel, taal_framedone_cb, + dssdev); + if (r) + goto err; + } + + return IRQ_HANDLED; +err: + dev_err(&dssdev->dev, "start update failed\n"); + dsi_bus_unlock(dssdev); + return IRQ_HANDLED; +} + +static void taal_te_timeout_work_callback(struct work_struct *work) +{ + struct taal_data *td = container_of(work, struct taal_data, + te_timeout_work.work); + struct omap_dss_device *dssdev = td->dssdev; + + dev_err(&dssdev->dev, "TE not received for 250ms!\n"); + + atomic_set(&td->do_update, 0); + dsi_bus_unlock(dssdev); +} + +static int taal_update(struct omap_dss_device *dssdev, + u16 x, u16 y, u16 w, u16 h) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + int r; + + dev_dbg(&dssdev->dev, "update %d, %d, %d x %d\n", x, y, w, h); + + mutex_lock(&td->lock); + dsi_bus_lock(dssdev); + + r = taal_wake_up(dssdev); + if (r) + goto err; + + if (!td->enabled) { + r = 0; + goto err; + } + + /* XXX no need to send this every frame, but dsi break if not done */ + r = taal_set_update_window(td, 0, 0, + dssdev->panel.timings.x_res, + dssdev->panel.timings.y_res); + if (r) + goto err; + + if (td->te_enabled && gpio_is_valid(td->ext_te_gpio)) { + schedule_delayed_work(&td->te_timeout_work, + msecs_to_jiffies(250)); + atomic_set(&td->do_update, 1); + } else { + r = omap_dsi_update(dssdev, td->channel, taal_framedone_cb, + dssdev); + if (r) + goto err; + } + + /* note: no bus_unlock here. unlock is in framedone_cb */ + mutex_unlock(&td->lock); + return 0; +err: + dsi_bus_unlock(dssdev); + mutex_unlock(&td->lock); + return r; +} + +static int taal_sync(struct omap_dss_device *dssdev) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + + dev_dbg(&dssdev->dev, "sync\n"); + + mutex_lock(&td->lock); + dsi_bus_lock(dssdev); + dsi_bus_unlock(dssdev); + mutex_unlock(&td->lock); + + dev_dbg(&dssdev->dev, "sync done\n"); + + return 0; +} + +static int _taal_enable_te(struct omap_dss_device *dssdev, bool enable) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + int r; + + if (enable) + r = taal_dcs_write_1(td, MIPI_DCS_SET_TEAR_ON, 0); + else + r = taal_dcs_write_0(td, MIPI_DCS_SET_TEAR_OFF); + + if (!gpio_is_valid(td->ext_te_gpio)) + omapdss_dsi_enable_te(dssdev, enable); + + /* possible panel bug */ + msleep(100); + + return r; +} + +static int taal_enable_te(struct omap_dss_device *dssdev, bool enable) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + int r; + + mutex_lock(&td->lock); + + if (td->te_enabled == enable) + goto end; + + dsi_bus_lock(dssdev); + + if (td->enabled) { + r = taal_wake_up(dssdev); + if (r) + goto err; + + r = _taal_enable_te(dssdev, enable); + if (r) + goto err; + } + + td->te_enabled = enable; + + dsi_bus_unlock(dssdev); +end: + mutex_unlock(&td->lock); + + return 0; +err: + dsi_bus_unlock(dssdev); + mutex_unlock(&td->lock); + + return r; +} + +static int taal_get_te(struct omap_dss_device *dssdev) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + int r; + + mutex_lock(&td->lock); + r = td->te_enabled; + mutex_unlock(&td->lock); + + return r; +} + +static int taal_run_test(struct omap_dss_device *dssdev, int test_num) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + u8 id1, id2, id3; + int r; + + mutex_lock(&td->lock); + + if (!td->enabled) { + r = -ENODEV; + goto err1; + } + + dsi_bus_lock(dssdev); + + r = taal_wake_up(dssdev); + if (r) + goto err2; + + r = taal_dcs_read_1(td, DCS_GET_ID1, &id1); + if (r) + goto err2; + r = taal_dcs_read_1(td, DCS_GET_ID2, &id2); + if (r) + goto err2; + r = taal_dcs_read_1(td, DCS_GET_ID3, &id3); + if (r) + goto err2; + + dsi_bus_unlock(dssdev); + mutex_unlock(&td->lock); + return 0; +err2: + dsi_bus_unlock(dssdev); +err1: + mutex_unlock(&td->lock); + return r; +} + +static int taal_memory_read(struct omap_dss_device *dssdev, + void *buf, size_t size, + u16 x, u16 y, u16 w, u16 h) +{ + int r; + int first = 1; + int plen; + unsigned buf_used = 0; + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + + if (size < w * h * 3) + return -ENOMEM; + + mutex_lock(&td->lock); + + if (!td->enabled) { + r = -ENODEV; + goto err1; + } + + size = min(w * h * 3, + dssdev->panel.timings.x_res * + dssdev->panel.timings.y_res * 3); + + dsi_bus_lock(dssdev); + + r = taal_wake_up(dssdev); + if (r) + goto err2; + + /* plen 1 or 2 goes into short packet. until checksum error is fixed, + * use short packets. plen 32 works, but bigger packets seem to cause + * an error. */ + if (size % 2) + plen = 1; + else + plen = 2; + + taal_set_update_window(td, x, y, w, h); + + r = dsi_vc_set_max_rx_packet_size(dssdev, td->channel, plen); + if (r) + goto err2; + + while (buf_used < size) { + u8 dcs_cmd = first ? 0x2e : 0x3e; + first = 0; + + r = dsi_vc_dcs_read(dssdev, td->channel, dcs_cmd, + buf + buf_used, size - buf_used); + + if (r < 0) { + dev_err(&dssdev->dev, "read error\n"); + goto err3; + } + + buf_used += r; + + if (r < plen) { + dev_err(&dssdev->dev, "short read\n"); + break; + } + + if (signal_pending(current)) { + dev_err(&dssdev->dev, "signal pending, " + "aborting memory read\n"); + r = -ERESTARTSYS; + goto err3; + } + } + + r = buf_used; + +err3: + dsi_vc_set_max_rx_packet_size(dssdev, td->channel, 1); +err2: + dsi_bus_unlock(dssdev); +err1: + mutex_unlock(&td->lock); + return r; +} + +static void taal_ulps_work(struct work_struct *work) +{ + struct taal_data *td = container_of(work, struct taal_data, + ulps_work.work); + struct omap_dss_device *dssdev = td->dssdev; + + mutex_lock(&td->lock); + + if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE || !td->enabled) { + mutex_unlock(&td->lock); + return; + } + + dsi_bus_lock(dssdev); + + taal_enter_ulps(dssdev); + + dsi_bus_unlock(dssdev); + mutex_unlock(&td->lock); +} + +static void taal_esd_work(struct work_struct *work) +{ + struct taal_data *td = container_of(work, struct taal_data, + esd_work.work); + struct omap_dss_device *dssdev = td->dssdev; + u8 state1, state2; + int r; + + mutex_lock(&td->lock); + + if (!td->enabled) { + mutex_unlock(&td->lock); + return; + } + + dsi_bus_lock(dssdev); + + r = taal_wake_up(dssdev); + if (r) { + dev_err(&dssdev->dev, "failed to exit ULPS\n"); + goto err; + } + + r = taal_dcs_read_1(td, MIPI_DCS_GET_DIAGNOSTIC_RESULT, &state1); + if (r) { + dev_err(&dssdev->dev, "failed to read Taal status\n"); + goto err; + } + + /* Run self diagnostics */ + r = taal_sleep_out(td); + if (r) { + dev_err(&dssdev->dev, "failed to run Taal self-diagnostics\n"); + goto err; + } + + r = taal_dcs_read_1(td, MIPI_DCS_GET_DIAGNOSTIC_RESULT, &state2); + if (r) { + dev_err(&dssdev->dev, "failed to read Taal status\n"); + goto err; + } + + /* Each sleep out command will trigger a self diagnostic and flip + * Bit6 if the test passes. + */ + if (!((state1 ^ state2) & (1 << 6))) { + dev_err(&dssdev->dev, "LCD self diagnostics failed\n"); + goto err; + } + /* Self-diagnostics result is also shown on TE GPIO line. We need + * to re-enable TE after self diagnostics */ + if (td->te_enabled && gpio_is_valid(td->ext_te_gpio)) { + r = taal_dcs_write_1(td, MIPI_DCS_SET_TEAR_ON, 0); + if (r) + goto err; + } + + dsi_bus_unlock(dssdev); + + taal_queue_esd_work(dssdev); + + mutex_unlock(&td->lock); + return; +err: + dev_err(&dssdev->dev, "performing LCD reset\n"); + + taal_panel_reset(dssdev); + + dsi_bus_unlock(dssdev); + + taal_queue_esd_work(dssdev); + + mutex_unlock(&td->lock); +} + +static struct omap_dss_driver taal_driver = { + .probe = taal_probe, + .remove = __exit_p(taal_remove), + + .enable = taal_enable, + .disable = taal_disable, + + .update = taal_update, + .sync = taal_sync, + + .get_resolution = taal_get_resolution, + .get_recommended_bpp = omapdss_default_get_recommended_bpp, + + .enable_te = taal_enable_te, + .get_te = taal_get_te, + + .run_test = taal_run_test, + .memory_read = taal_memory_read, + + .driver = { + .name = "taal", + .owner = THIS_MODULE, + }, +}; + +static int __init taal_init(void) +{ + omap_dss_register_driver(&taal_driver); + + return 0; +} + +static void __exit taal_exit(void) +{ + omap_dss_unregister_driver(&taal_driver); +} + +module_init(taal_init); +module_exit(taal_exit); + +MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>"); +MODULE_DESCRIPTION("Taal Driver"); +MODULE_LICENSE("GPL"); |