diff options
| -rw-r--r-- | drivers/video/omap2/displays/Kconfig | 6 | ||||
| -rw-r--r-- | drivers/video/omap2/displays/Makefile | 2 | ||||
| -rw-r--r-- | drivers/video/omap2/displays/panel-taal.c | 1003 |
3 files changed, 1011 insertions, 0 deletions
diff --git a/drivers/video/omap2/displays/Kconfig b/drivers/video/omap2/displays/Kconfig index 2a39bfeca11..b12a59c9c50 100644 --- a/drivers/video/omap2/displays/Kconfig +++ b/drivers/video/omap2/displays/Kconfig @@ -13,4 +13,10 @@ config PANEL_SHARP_LS037V7DW01 help LCD Panel used in TI's SDP3430 and EVM boards +config PANEL_TAAL + tristate "Taal DSI Panel" + depends on OMAP2_DSS_DSI + help + Taal DSI command mode panel from TPO. + endmenu diff --git a/drivers/video/omap2/displays/Makefile b/drivers/video/omap2/displays/Makefile index 12dd37c227d..955646440b3 100644 --- a/drivers/video/omap2/displays/Makefile +++ b/drivers/video/omap2/displays/Makefile @@ -1,2 +1,4 @@ obj-$(CONFIG_PANEL_GENERIC) += panel-generic.o obj-$(CONFIG_PANEL_SHARP_LS037V7DW01) += panel-sharp-ls037v7dw01.o + +obj-$(CONFIG_PANEL_TAAL) += panel-taal.o diff --git a/drivers/video/omap2/displays/panel-taal.c b/drivers/video/omap2/displays/panel-taal.c new file mode 100644 index 00000000000..1f01dfc5e52 --- /dev/null +++ b/drivers/video/omap2/displays/panel-taal.c @@ -0,0 +1,1003 @@ +/* + * 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/completion.h> +#include <linux/workqueue.h> + +#include <plat/display.h> + +/* DSI Virtual channel. Hardcoded for now. */ +#define TCH 0 + +#define DCS_READ_NUM_ERRORS 0x05 +#define DCS_READ_POWER_MODE 0x0a +#define DCS_READ_MADCTL 0x0b +#define DCS_READ_PIXEL_FORMAT 0x0c +#define DCS_RDDSDR 0x0f +#define DCS_SLEEP_IN 0x10 +#define DCS_SLEEP_OUT 0x11 +#define DCS_DISPLAY_OFF 0x28 +#define DCS_DISPLAY_ON 0x29 +#define DCS_COLUMN_ADDR 0x2a +#define DCS_PAGE_ADDR 0x2b +#define DCS_MEMORY_WRITE 0x2c +#define DCS_TEAR_OFF 0x34 +#define DCS_TEAR_ON 0x35 +#define DCS_MEM_ACC_CTRL 0x36 +#define DCS_PIXEL_FORMAT 0x3a +#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 + +/* #define TAAL_USE_ESD_CHECK */ +#define TAAL_ESD_CHECK_PERIOD msecs_to_jiffies(5000) + +struct taal_data { + 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; + + bool enabled; + u8 rotate; + bool mirror; + + bool te_enabled; + bool use_ext_te; + struct completion te_completion; + + bool use_dsi_bl; + + bool cabc_broken; + unsigned cabc_mode; + + bool intro_printed; + + struct workqueue_struct *esd_wq; + struct delayed_work esd_work; +}; + +static void taal_esd_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(u8 dcs_cmd, u8 *data) +{ + int r; + u8 buf[1]; + + r = dsi_vc_dcs_read(TCH, dcs_cmd, buf, 1); + + if (r < 0) + return r; + + *data = buf[0]; + + return 0; +} + +static int taal_dcs_write_0(u8 dcs_cmd) +{ + return dsi_vc_dcs_write(TCH, &dcs_cmd, 1); +} + +static int taal_dcs_write_1(u8 dcs_cmd, u8 param) +{ + u8 buf[2]; + buf[0] = dcs_cmd; + buf[1] = param; + return dsi_vc_dcs_write(TCH, buf, 2); +} + +static int taal_sleep_in(struct taal_data *td) + +{ + u8 cmd; + int r; + + hw_guard_wait(td); + + cmd = DCS_SLEEP_IN; + r = dsi_vc_dcs_write_nosync(TCH, &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(DCS_SLEEP_OUT); + if (r) + return r; + + hw_guard_start(td, 120); + + msleep(5); + + return 0; +} + +static int taal_get_id(u8 *id1, u8 *id2, u8 *id3) +{ + int r; + + r = taal_dcs_read_1(DCS_GET_ID1, id1); + if (r) + return r; + r = taal_dcs_read_1(DCS_GET_ID2, id2); + if (r) + return r; + r = taal_dcs_read_1(DCS_GET_ID3, id3); + if (r) + return r; + + return 0; +} + +static int taal_set_addr_mode(u8 rotate, bool mirror) +{ + int r; + u8 mode; + int b5, b6, b7; + + r = taal_dcs_read_1(DCS_READ_MADCTL, &mode); + if (r) + return r; + + switch (rotate) { + default: + case 0: + b7 = 0; + b6 = 0; + b5 = 0; + break; + case 1: + b7 = 0; + b6 = 1; + b5 = 1; + break; + case 2: + b7 = 1; + b6 = 1; + b5 = 0; + break; + case 3: + b7 = 1; + b6 = 0; + b5 = 1; + break; + } + + if (mirror) + b6 = !b6; + + mode &= ~((1<<7) | (1<<6) | (1<<5)); + mode |= (b7 << 7) | (b6 << 6) | (b5 << 5); + + return taal_dcs_write_1(DCS_MEM_ACC_CTRL, mode); +} + +static int taal_set_update_window(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] = DCS_COLUMN_ADDR; + 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(TCH, buf, sizeof(buf)); + if (r) + return r; + + buf[0] = DCS_PAGE_ADDR; + 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(TCH, buf, sizeof(buf)); + if (r) + return r; + + dsi_vc_send_bta_sync(TCH); + + return r; +} + +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); + + if (td->use_dsi_bl) { + if (td->enabled) { + dsi_bus_lock(); + r = taal_dcs_write_1(DCS_BRIGHTNESS, level); + dsi_bus_unlock(); + if (r) + return r; + } + } else { + if (!dssdev->set_backlight) + return -EINVAL; + + r = dssdev->set_backlight(dssdev, level); + if (r) + return r; + } + + return 0; +} + +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 struct backlight_ops taal_bl_ops = { + .get_brightness = taal_bl_get_intensity, + .update_status = taal_bl_update_status, +}; + +static void taal_get_timings(struct omap_dss_device *dssdev, + struct omap_video_timings *timings) +{ + *timings = dssdev->panel.timings; +} + +static void taal_get_resolution(struct omap_dss_device *dssdev, + u16 *xres, u16 *yres) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + + if (td->rotate == 0 || td->rotate == 2) { + *xres = dssdev->panel.timings.x_res; + *yres = dssdev->panel.timings.y_res; + } else { + *yres = dssdev->panel.timings.x_res; + *xres = dssdev->panel.timings.y_res; + } +} + +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); + + complete_all(&td->te_completion); + + return IRQ_HANDLED; +} + +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; + int r; + + if (td->enabled) { + dsi_bus_lock(); + r = taal_dcs_read_1(DCS_READ_NUM_ERRORS, &errors); + dsi_bus_unlock(); + } else { + r = -ENODEV; + } + + 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; + + if (td->enabled) { + dsi_bus_lock(); + r = taal_get_id(&id1, &id2, &id3); + dsi_bus_unlock(); + } else { + r = -ENODEV; + } + + 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; + + 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; + + if (td->enabled) { + dsi_bus_lock(); + if (!td->cabc_broken) + taal_dcs_write_1(DCS_WRITE_CABC, i); + dsi_bus_unlock(); + } + + td->cabc_mode = i; + + return count; +} + +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 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 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, + NULL, +}; + +static struct attribute_group taal_attr_group = { + .attrs = taal_attrs, +}; + +static int taal_probe(struct omap_dss_device *dssdev) +{ + struct taal_data *td; + struct backlight_device *bldev; + int r; + + const struct omap_video_timings taal_panel_timings = { + .x_res = 864, + .y_res = 480, + }; + + dev_dbg(&dssdev->dev, "probe\n"); + + dssdev->panel.config = OMAP_DSS_LCD_TFT; + dssdev->panel.timings = taal_panel_timings; + dssdev->ctrl.pixel_size = 24; + + td = kzalloc(sizeof(*td), GFP_KERNEL); + if (!td) { + r = -ENOMEM; + goto err0; + } + td->dssdev = dssdev; + + td->esd_wq = create_singlethread_workqueue("taal_esd"); + if (td->esd_wq == NULL) { + dev_err(&dssdev->dev, "can't create ESD workqueue\n"); + r = -ENOMEM; + goto err2; + } + INIT_DELAYED_WORK_DEFERRABLE(&td->esd_work, taal_esd_work); + + dev_set_drvdata(&dssdev->dev, td); + + dssdev->get_timings = taal_get_timings; + dssdev->get_resolution = taal_get_resolution; + + /* if no platform set_backlight() defined, presume DSI backlight + * control */ + if (!dssdev->set_backlight) + td->use_dsi_bl = true; + + bldev = backlight_device_register("taal", &dssdev->dev, dssdev, + &taal_bl_ops); + if (IS_ERR(bldev)) { + r = PTR_ERR(bldev); + goto err1; + } + + td->bldev = bldev; + + bldev->props.fb_blank = FB_BLANK_UNBLANK; + bldev->props.power = FB_BLANK_UNBLANK; + if (td->use_dsi_bl) { + bldev->props.max_brightness = 255; + bldev->props.brightness = 255; + } else { + bldev->props.max_brightness = 127; + bldev->props.brightness = 127; + } + + taal_bl_update_status(bldev); + + if (dssdev->phy.dsi.ext_te) { + int gpio = dssdev->phy.dsi.ext_te_gpio; + + r = gpio_request(gpio, "taal irq"); + if (r) { + dev_err(&dssdev->dev, "GPIO request failed\n"); + goto err3; + } + + gpio_direction_input(gpio); + + r = request_irq(gpio_to_irq(gpio), taal_te_isr, + IRQF_DISABLED | IRQF_TRIGGER_RISING, + "taal vsync", dssdev); + + if (r) { + dev_err(&dssdev->dev, "IRQ request failed\n"); + gpio_free(gpio); + goto err3; + } + + init_completion(&td->te_completion); + + td->use_ext_te = true; + } + + r = sysfs_create_group(&dssdev->dev.kobj, &taal_attr_group); + if (r) { + dev_err(&dssdev->dev, "failed to create sysfs files\n"); + goto err4; + } + + return 0; +err4: + if (td->use_ext_te) { + int gpio = dssdev->phy.dsi.ext_te_gpio; + free_irq(gpio_to_irq(gpio), dssdev); + gpio_free(gpio); + } +err3: + backlight_device_unregister(bldev); +err2: + cancel_delayed_work_sync(&td->esd_work); + destroy_workqueue(td->esd_wq); +err1: + kfree(td); +err0: + return r; +} + +static void 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); + + if (td->use_ext_te) { + int gpio = dssdev->phy.dsi.ext_te_gpio; + free_irq(gpio_to_irq(gpio), dssdev); + gpio_free(gpio); + } + + bldev = td->bldev; + bldev->props.power = FB_BLANK_POWERDOWN; + taal_bl_update_status(bldev); + backlight_device_unregister(bldev); + + cancel_delayed_work_sync(&td->esd_work); + destroy_workqueue(td->esd_wq); + + kfree(td); +} + +static int taal_enable(struct omap_dss_device *dssdev) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + u8 id1, id2, id3; + int r; + + dev_dbg(&dssdev->dev, "enable\n"); + + if (dssdev->platform_enable) { + r = dssdev->platform_enable(dssdev); + if (r) + return r; + } + + /* it seems we have to wait a bit until taal is ready */ + msleep(5); + + r = taal_sleep_out(td); + if (r) + goto err; + + r = taal_get_id(&id1, &id2, &id3); + if (r) + goto err; + + /* on early revisions CABC is broken */ + if (id2 == 0x00 || id2 == 0xff || id2 == 0x81) + td->cabc_broken = true; + + taal_dcs_write_1(DCS_BRIGHTNESS, 0xff); + taal_dcs_write_1(DCS_CTRL_DISPLAY, (1<<2) | (1<<5)); /* BL | BCTRL */ + + taal_dcs_write_1(DCS_PIXEL_FORMAT, 0x7); /* 24bit/pixel */ + + taal_set_addr_mode(td->rotate, td->mirror); + if (!td->cabc_broken) + taal_dcs_write_1(DCS_WRITE_CABC, td->cabc_mode); + + taal_dcs_write_0(DCS_DISPLAY_ON); + +#ifdef TAAL_USE_ESD_CHECK + queue_delayed_work(td->esd_wq, &td->esd_work, TAAL_ESD_CHECK_PERIOD); +#endif + + td->enabled = 1; + + if (!td->intro_printed) { + dev_info(&dssdev->dev, "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; + } + + return 0; +err: + if (dssdev->platform_disable) + dssdev->platform_disable(dssdev); + + 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"); + + cancel_delayed_work(&td->esd_work); + + taal_dcs_write_0(DCS_DISPLAY_OFF); + taal_sleep_in(td); + + /* wait a bit so that the message goes through */ + msleep(10); + + if (dssdev->platform_disable) + dssdev->platform_disable(dssdev); + + td->enabled = 0; +} + +static int taal_suspend(struct omap_dss_device *dssdev) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + struct backlight_device *bldev = td->bldev; + + bldev->props.power = FB_BLANK_POWERDOWN; + taal_bl_update_status(bldev); + + return 0; +} + +static int taal_resume(struct omap_dss_device *dssdev) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + struct backlight_device *bldev = td->bldev; + + bldev->props.power = FB_BLANK_UNBLANK; + taal_bl_update_status(bldev); + + return 0; +} + +static void taal_setup_update(struct omap_dss_device *dssdev, + u16 x, u16 y, u16 w, u16 h) +{ + taal_set_update_window(x, y, w, h); +} + +static int taal_enable_te(struct omap_dss_device *dssdev, bool enable) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + int r; + + td->te_enabled = enable; + + if (enable) + r = taal_dcs_write_1(DCS_TEAR_ON, 0); + else + r = taal_dcs_write_0(DCS_TEAR_OFF); + + return r; +} + +static int taal_wait_te(struct omap_dss_device *dssdev) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + long wait = msecs_to_jiffies(500); + + if (!td->use_ext_te || !td->te_enabled) + return 0; + + INIT_COMPLETION(td->te_completion); + wait = wait_for_completion_timeout(&td->te_completion, wait); + if (wait == 0) { + dev_err(&dssdev->dev, "timeout waiting TE\n"); + return -ETIME; + } + + return 0; +} + +static int taal_rotate(struct omap_dss_device *dssdev, u8 rotate) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + int r; + + dev_dbg(&dssdev->dev, "rotate %d\n", rotate); + + if (td->enabled) { + r = taal_set_addr_mode(rotate, td->mirror); + + if (r) + return r; + } + + td->rotate = rotate; + + return 0; +} + +static u8 taal_get_rotate(struct omap_dss_device *dssdev) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + return td->rotate; +} + +static int taal_mirror(struct omap_dss_device *dssdev, bool enable) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + int r; + + dev_dbg(&dssdev->dev, "mirror %d\n", enable); + + if (td->enabled) { + r = taal_set_addr_mode(td->rotate, enable); + + if (r) + return r; + } + + td->mirror = enable; + + return 0; +} + +static bool taal_get_mirror(struct omap_dss_device *dssdev) +{ + struct taal_data *td = dev_get_drvdata(&dssdev->dev); + return td->mirror; +} + +static int taal_run_test(struct omap_dss_device *dssdev, int test_num) +{ + u8 id1, id2, id3; + int r; + + r = taal_dcs_read_1(DCS_GET_ID1, &id1); + if (r) + return r; + r = taal_dcs_read_1(DCS_GET_ID2, &id2); + if (r) + return r; + r = taal_dcs_read_1(DCS_GET_ID3, &id3); + if (r) + return r; + + return 0; +} + +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; + + if (size < w * h * 3) + return -ENOMEM; + + size = min(w * h * 3, + dssdev->panel.timings.x_res * + dssdev->panel.timings.y_res * 3); + + /* 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_setup_update(dssdev, x, y, w, h); + + r = dsi_vc_set_max_rx_packet_size(TCH, plen); + if (r) + return r; + + while (buf_used < size) { + u8 dcs_cmd = first ? 0x2e : 0x3e; + first = 0; + + r = dsi_vc_dcs_read(TCH, dcs_cmd, + buf + buf_used, size - buf_used); + + if (r < 0) { + dev_err(&dssdev->dev, "read error\n"); + goto err; + } + + 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 err; + } + } + + r = buf_used; + +err: + dsi_vc_set_max_rx_packet_size(TCH, 1); + + return r; +} + +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; + + if (!td->enabled) + return; + + dsi_bus_lock(); + + r = taal_dcs_read_1(DCS_RDDSDR, &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(DCS_RDDSDR, &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->use_ext_te && td->te_enabled) + taal_enable_te(dssdev, true); + + dsi_bus_unlock(); + + queue_delayed_work(td->esd_wq, &td->esd_work, TAAL_ESD_CHECK_PERIOD); + + return; +err: + dev_err(&dssdev->dev, "performing LCD reset\n"); + + taal_disable(dssdev); + taal_enable(dssdev); + + dsi_bus_unlock(); + + queue_delayed_work(td->esd_wq, &td->esd_work, TAAL_ESD_CHECK_PERIOD); +} + +static struct omap_dss_driver taal_driver = { + .probe = taal_probe, + .remove = taal_remove, + + .enable = taal_enable, + .disable = taal_disable, + .suspend = taal_suspend, + .resume = taal_resume, + + .setup_update = taal_setup_update, + .enable_te = taal_enable_te, + .wait_for_te = taal_wait_te, + .set_rotate = taal_rotate, + .get_rotate = taal_get_rotate, + .set_mirror = taal_mirror, + .get_mirror = taal_get_mirror, + .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"); |