diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c | 1385 |
1 files changed, 1385 insertions, 0 deletions
diff --git a/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c b/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c new file mode 100644 index 000000000..faca5c873 --- /dev/null +++ b/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c @@ -0,0 +1,1385 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Generic DSI Command Mode panel driver + * + * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/ + * Author: Tomi Valkeinen <tomi.valkeinen@ti.com> + */ + +/* #define DEBUG */ + +#include <linux/backlight.h> +#include <linux/delay.h> +#include <linux/gpio/consumer.h> +#include <linux/interrupt.h> +#include <linux/jiffies.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/sched/signal.h> +#include <linux/slab.h> +#include <linux/workqueue.h> +#include <linux/of_device.h> +#include <linux/regulator/consumer.h> + +#include <drm/drm_connector.h> + +#include <video/mipi_display.h> +#include <video/of_display_timing.h> + +#include "../dss/omapdss.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_GET_ID1 0xda +#define DCS_GET_ID2 0xdb +#define DCS_GET_ID3 0xdc + +struct panel_drv_data { + struct omap_dss_device dssdev; + struct omap_dss_device *src; + + struct videomode vm; + + struct platform_device *pdev; + + struct mutex lock; + + struct backlight_device *bldev; + struct backlight_device *extbldev; + + 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 */ + + /* panel HW configuration from DT or platform data */ + struct gpio_desc *reset_gpio; + struct gpio_desc *ext_te_gpio; + + struct regulator *vpnl; + struct regulator *vddi; + + bool use_dsi_backlight; + + int width_mm; + int height_mm; + + 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 intro_printed; + + struct workqueue_struct *workqueue; + + bool ulps_enabled; + unsigned int ulps_timeout; + struct delayed_work ulps_work; +}; + +#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev) + +static irqreturn_t dsicm_te_isr(int irq, void *data); +static void dsicm_te_timeout_work_callback(struct work_struct *work); +static int _dsicm_enable_te(struct panel_drv_data *ddata, bool enable); + +static int dsicm_panel_reset(struct panel_drv_data *ddata); + +static void dsicm_ulps_work(struct work_struct *work); + +static void dsicm_bl_power(struct panel_drv_data *ddata, bool enable) +{ + struct backlight_device *backlight; + + if (ddata->bldev) + backlight = ddata->bldev; + else if (ddata->extbldev) + backlight = ddata->extbldev; + else + return; + + if (enable) { + backlight->props.fb_blank = FB_BLANK_UNBLANK; + backlight->props.state = ~(BL_CORE_FBBLANK | BL_CORE_SUSPENDED); + backlight->props.power = FB_BLANK_UNBLANK; + } else { + backlight->props.fb_blank = FB_BLANK_NORMAL; + backlight->props.power = FB_BLANK_POWERDOWN; + backlight->props.state |= BL_CORE_FBBLANK | BL_CORE_SUSPENDED; + } + + backlight_update_status(backlight); +} + +static void hw_guard_start(struct panel_drv_data *ddata, int guard_msec) +{ + ddata->hw_guard_wait = msecs_to_jiffies(guard_msec); + ddata->hw_guard_end = jiffies + ddata->hw_guard_wait; +} + +static void hw_guard_wait(struct panel_drv_data *ddata) +{ + unsigned long wait = ddata->hw_guard_end - jiffies; + + if ((long)wait > 0 && wait <= ddata->hw_guard_wait) { + set_current_state(TASK_UNINTERRUPTIBLE); + schedule_timeout(wait); + } +} + +static int dsicm_dcs_read_1(struct panel_drv_data *ddata, u8 dcs_cmd, u8 *data) +{ + struct omap_dss_device *src = ddata->src; + int r; + u8 buf[1]; + + r = src->ops->dsi.dcs_read(src, ddata->channel, dcs_cmd, buf, 1); + + if (r < 0) + return r; + + *data = buf[0]; + + return 0; +} + +static int dsicm_dcs_write_0(struct panel_drv_data *ddata, u8 dcs_cmd) +{ + struct omap_dss_device *src = ddata->src; + + return src->ops->dsi.dcs_write(src, ddata->channel, &dcs_cmd, 1); +} + +static int dsicm_dcs_write_1(struct panel_drv_data *ddata, u8 dcs_cmd, u8 param) +{ + struct omap_dss_device *src = ddata->src; + u8 buf[2] = { dcs_cmd, param }; + + return src->ops->dsi.dcs_write(src, ddata->channel, buf, 2); +} + +static int dsicm_sleep_in(struct panel_drv_data *ddata) + +{ + struct omap_dss_device *src = ddata->src; + u8 cmd; + int r; + + hw_guard_wait(ddata); + + cmd = MIPI_DCS_ENTER_SLEEP_MODE; + r = src->ops->dsi.dcs_write_nosync(src, ddata->channel, &cmd, 1); + if (r) + return r; + + hw_guard_start(ddata, 120); + + usleep_range(5000, 10000); + + return 0; +} + +static int dsicm_sleep_out(struct panel_drv_data *ddata) +{ + int r; + + hw_guard_wait(ddata); + + r = dsicm_dcs_write_0(ddata, MIPI_DCS_EXIT_SLEEP_MODE); + if (r) + return r; + + hw_guard_start(ddata, 120); + + usleep_range(5000, 10000); + + return 0; +} + +static int dsicm_get_id(struct panel_drv_data *ddata, u8 *id1, u8 *id2, u8 *id3) +{ + int r; + + r = dsicm_dcs_read_1(ddata, DCS_GET_ID1, id1); + if (r) + return r; + r = dsicm_dcs_read_1(ddata, DCS_GET_ID2, id2); + if (r) + return r; + r = dsicm_dcs_read_1(ddata, DCS_GET_ID3, id3); + if (r) + return r; + + return 0; +} + +static int dsicm_set_update_window(struct panel_drv_data *ddata, + u16 x, u16 y, u16 w, u16 h) +{ + struct omap_dss_device *src = ddata->src; + 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 = src->ops->dsi.dcs_write_nosync(src, ddata->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 = src->ops->dsi.dcs_write_nosync(src, ddata->channel, buf, sizeof(buf)); + if (r) + return r; + + src->ops->dsi.bta_sync(src, ddata->channel); + + return r; +} + +static void dsicm_queue_ulps_work(struct panel_drv_data *ddata) +{ + if (ddata->ulps_timeout > 0) + queue_delayed_work(ddata->workqueue, &ddata->ulps_work, + msecs_to_jiffies(ddata->ulps_timeout)); +} + +static void dsicm_cancel_ulps_work(struct panel_drv_data *ddata) +{ + cancel_delayed_work(&ddata->ulps_work); +} + +static int dsicm_enter_ulps(struct panel_drv_data *ddata) +{ + struct omap_dss_device *src = ddata->src; + int r; + + if (ddata->ulps_enabled) + return 0; + + dsicm_cancel_ulps_work(ddata); + + r = _dsicm_enable_te(ddata, false); + if (r) + goto err; + + if (ddata->ext_te_gpio) + disable_irq(gpiod_to_irq(ddata->ext_te_gpio)); + + src->ops->dsi.disable(src, false, true); + + ddata->ulps_enabled = true; + + return 0; + +err: + dev_err(&ddata->pdev->dev, "enter ULPS failed"); + dsicm_panel_reset(ddata); + + ddata->ulps_enabled = false; + + dsicm_queue_ulps_work(ddata); + + return r; +} + +static int dsicm_exit_ulps(struct panel_drv_data *ddata) +{ + struct omap_dss_device *src = ddata->src; + int r; + + if (!ddata->ulps_enabled) + return 0; + + src->ops->enable(src); + src->ops->dsi.enable_hs(src, ddata->channel, true); + + r = _dsicm_enable_te(ddata, true); + if (r) { + dev_err(&ddata->pdev->dev, "failed to re-enable TE"); + goto err2; + } + + if (ddata->ext_te_gpio) + enable_irq(gpiod_to_irq(ddata->ext_te_gpio)); + + dsicm_queue_ulps_work(ddata); + + ddata->ulps_enabled = false; + + return 0; + +err2: + dev_err(&ddata->pdev->dev, "failed to exit ULPS"); + + r = dsicm_panel_reset(ddata); + if (!r) { + if (ddata->ext_te_gpio) + enable_irq(gpiod_to_irq(ddata->ext_te_gpio)); + ddata->ulps_enabled = false; + } + + dsicm_queue_ulps_work(ddata); + + return r; +} + +static int dsicm_wake_up(struct panel_drv_data *ddata) +{ + if (ddata->ulps_enabled) + return dsicm_exit_ulps(ddata); + + dsicm_cancel_ulps_work(ddata); + dsicm_queue_ulps_work(ddata); + return 0; +} + +static int dsicm_bl_update_status(struct backlight_device *dev) +{ + struct panel_drv_data *ddata = dev_get_drvdata(&dev->dev); + struct omap_dss_device *src = ddata->src; + int r = 0; + 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(&ddata->pdev->dev, "update brightness to %d\n", level); + + mutex_lock(&ddata->lock); + + if (ddata->enabled) { + src->ops->dsi.bus_lock(src); + + r = dsicm_wake_up(ddata); + if (!r) + r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, level); + + src->ops->dsi.bus_unlock(src); + } + + mutex_unlock(&ddata->lock); + + return r; +} + +static int dsicm_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 dsicm_bl_ops = { + .get_brightness = dsicm_bl_get_intensity, + .update_status = dsicm_bl_update_status, +}; + +static ssize_t dsicm_num_errors_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct panel_drv_data *ddata = dev_get_drvdata(dev); + struct omap_dss_device *src = ddata->src; + u8 errors = 0; + int r; + + mutex_lock(&ddata->lock); + + if (ddata->enabled) { + src->ops->dsi.bus_lock(src); + + r = dsicm_wake_up(ddata); + if (!r) + r = dsicm_dcs_read_1(ddata, DCS_READ_NUM_ERRORS, + &errors); + + src->ops->dsi.bus_unlock(src); + } else { + r = -ENODEV; + } + + mutex_unlock(&ddata->lock); + + if (r) + return r; + + return snprintf(buf, PAGE_SIZE, "%d\n", errors); +} + +static ssize_t dsicm_hw_revision_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct panel_drv_data *ddata = dev_get_drvdata(dev); + struct omap_dss_device *src = ddata->src; + u8 id1, id2, id3; + int r; + + mutex_lock(&ddata->lock); + + if (ddata->enabled) { + src->ops->dsi.bus_lock(src); + + r = dsicm_wake_up(ddata); + if (!r) + r = dsicm_get_id(ddata, &id1, &id2, &id3); + + src->ops->dsi.bus_unlock(src); + } else { + r = -ENODEV; + } + + mutex_unlock(&ddata->lock); + + if (r) + return r; + + return snprintf(buf, PAGE_SIZE, "%02x.%02x.%02x\n", id1, id2, id3); +} + +static ssize_t dsicm_store_ulps(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct panel_drv_data *ddata = dev_get_drvdata(dev); + struct omap_dss_device *src = ddata->src; + unsigned long t; + int r; + + r = kstrtoul(buf, 0, &t); + if (r) + return r; + + mutex_lock(&ddata->lock); + + if (ddata->enabled) { + src->ops->dsi.bus_lock(src); + + if (t) + r = dsicm_enter_ulps(ddata); + else + r = dsicm_wake_up(ddata); + + src->ops->dsi.bus_unlock(src); + } + + mutex_unlock(&ddata->lock); + + if (r) + return r; + + return count; +} + +static ssize_t dsicm_show_ulps(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct panel_drv_data *ddata = dev_get_drvdata(dev); + unsigned int t; + + mutex_lock(&ddata->lock); + t = ddata->ulps_enabled; + mutex_unlock(&ddata->lock); + + return snprintf(buf, PAGE_SIZE, "%u\n", t); +} + +static ssize_t dsicm_store_ulps_timeout(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct panel_drv_data *ddata = dev_get_drvdata(dev); + struct omap_dss_device *src = ddata->src; + unsigned long t; + int r; + + r = kstrtoul(buf, 0, &t); + if (r) + return r; + + mutex_lock(&ddata->lock); + ddata->ulps_timeout = t; + + if (ddata->enabled) { + /* dsicm_wake_up will restart the timer */ + src->ops->dsi.bus_lock(src); + r = dsicm_wake_up(ddata); + src->ops->dsi.bus_unlock(src); + } + + mutex_unlock(&ddata->lock); + + if (r) + return r; + + return count; +} + +static ssize_t dsicm_show_ulps_timeout(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct panel_drv_data *ddata = dev_get_drvdata(dev); + unsigned int t; + + mutex_lock(&ddata->lock); + t = ddata->ulps_timeout; + mutex_unlock(&ddata->lock); + + return snprintf(buf, PAGE_SIZE, "%u\n", t); +} + +static DEVICE_ATTR(num_dsi_errors, S_IRUGO, dsicm_num_errors_show, NULL); +static DEVICE_ATTR(hw_revision, S_IRUGO, dsicm_hw_revision_show, NULL); +static DEVICE_ATTR(ulps, S_IRUGO | S_IWUSR, + dsicm_show_ulps, dsicm_store_ulps); +static DEVICE_ATTR(ulps_timeout, S_IRUGO | S_IWUSR, + dsicm_show_ulps_timeout, dsicm_store_ulps_timeout); + +static struct attribute *dsicm_attrs[] = { + &dev_attr_num_dsi_errors.attr, + &dev_attr_hw_revision.attr, + &dev_attr_ulps.attr, + &dev_attr_ulps_timeout.attr, + NULL, +}; + +static const struct attribute_group dsicm_attr_group = { + .attrs = dsicm_attrs, +}; + +static void dsicm_hw_reset(struct panel_drv_data *ddata) +{ + gpiod_set_value(ddata->reset_gpio, 1); + udelay(10); + /* reset the panel */ + gpiod_set_value(ddata->reset_gpio, 0); + /* assert reset */ + udelay(10); + gpiod_set_value(ddata->reset_gpio, 1); + /* wait after releasing reset */ + usleep_range(5000, 10000); +} + +static int dsicm_power_on(struct panel_drv_data *ddata) +{ + struct omap_dss_device *src = ddata->src; + 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, + .vm = &ddata->vm, + .hs_clk_min = 150000000, + .hs_clk_max = 300000000, + .lp_clk_min = 7000000, + .lp_clk_max = 10000000, + }; + + if (ddata->vpnl) { + r = regulator_enable(ddata->vpnl); + if (r) { + dev_err(&ddata->pdev->dev, + "failed to enable VPNL: %d\n", r); + return r; + } + } + + if (ddata->vddi) { + r = regulator_enable(ddata->vddi); + if (r) { + dev_err(&ddata->pdev->dev, + "failed to enable VDDI: %d\n", r); + goto err_vpnl; + } + } + + if (ddata->pin_config.num_pins > 0) { + r = src->ops->dsi.configure_pins(src, &ddata->pin_config); + if (r) { + dev_err(&ddata->pdev->dev, + "failed to configure DSI pins\n"); + goto err_vddi; + } + } + + r = src->ops->dsi.set_config(src, &dsi_config); + if (r) { + dev_err(&ddata->pdev->dev, "failed to configure DSI\n"); + goto err_vddi; + } + + src->ops->enable(src); + + dsicm_hw_reset(ddata); + + src->ops->dsi.enable_hs(src, ddata->channel, false); + + r = dsicm_sleep_out(ddata); + if (r) + goto err; + + r = dsicm_get_id(ddata, &id1, &id2, &id3); + if (r) + goto err; + + r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, 0xff); + if (r) + goto err; + + r = dsicm_dcs_write_1(ddata, DCS_CTRL_DISPLAY, + (1<<2) | (1<<5)); /* BL | BCTRL */ + if (r) + goto err; + + r = dsicm_dcs_write_1(ddata, MIPI_DCS_SET_PIXEL_FORMAT, + MIPI_DCS_PIXEL_FMT_24BIT); + if (r) + goto err; + + r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_DISPLAY_ON); + if (r) + goto err; + + r = _dsicm_enable_te(ddata, ddata->te_enabled); + if (r) + goto err; + + r = src->ops->dsi.enable_video_output(src, ddata->channel); + if (r) + goto err; + + ddata->enabled = true; + + if (!ddata->intro_printed) { + dev_info(&ddata->pdev->dev, "panel revision %02x.%02x.%02x\n", + id1, id2, id3); + ddata->intro_printed = true; + } + + src->ops->dsi.enable_hs(src, ddata->channel, true); + + return 0; +err: + dev_err(&ddata->pdev->dev, "error while enabling panel, issuing HW reset\n"); + + dsicm_hw_reset(ddata); + + src->ops->dsi.disable(src, true, false); +err_vddi: + if (ddata->vddi) + regulator_disable(ddata->vddi); +err_vpnl: + if (ddata->vpnl) + regulator_disable(ddata->vpnl); + + return r; +} + +static void dsicm_power_off(struct panel_drv_data *ddata) +{ + struct omap_dss_device *src = ddata->src; + int r; + + src->ops->dsi.disable_video_output(src, ddata->channel); + + r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_DISPLAY_OFF); + if (!r) + r = dsicm_sleep_in(ddata); + + if (r) { + dev_err(&ddata->pdev->dev, + "error disabling panel, issuing HW reset\n"); + dsicm_hw_reset(ddata); + } + + src->ops->dsi.disable(src, true, false); + + if (ddata->vddi) + regulator_disable(ddata->vddi); + if (ddata->vpnl) + regulator_disable(ddata->vpnl); + + ddata->enabled = false; +} + +static int dsicm_panel_reset(struct panel_drv_data *ddata) +{ + dev_err(&ddata->pdev->dev, "performing LCD reset\n"); + + dsicm_power_off(ddata); + dsicm_hw_reset(ddata); + return dsicm_power_on(ddata); +} + +static int dsicm_connect(struct omap_dss_device *src, + struct omap_dss_device *dst) +{ + struct panel_drv_data *ddata = to_panel_data(dst); + struct device *dev = &ddata->pdev->dev; + int r; + + r = src->ops->dsi.request_vc(src, &ddata->channel); + if (r) { + dev_err(dev, "failed to get virtual channel\n"); + return r; + } + + r = src->ops->dsi.set_vc_id(src, ddata->channel, TCH); + if (r) { + dev_err(dev, "failed to set VC_ID\n"); + src->ops->dsi.release_vc(src, ddata->channel); + return r; + } + + ddata->src = src; + return 0; +} + +static void dsicm_disconnect(struct omap_dss_device *src, + struct omap_dss_device *dst) +{ + struct panel_drv_data *ddata = to_panel_data(dst); + + src->ops->dsi.release_vc(src, ddata->channel); + ddata->src = NULL; +} + +static void dsicm_enable(struct omap_dss_device *dssdev) +{ + struct panel_drv_data *ddata = to_panel_data(dssdev); + struct omap_dss_device *src = ddata->src; + int r; + + mutex_lock(&ddata->lock); + + src->ops->dsi.bus_lock(src); + + r = dsicm_power_on(ddata); + + src->ops->dsi.bus_unlock(src); + + if (r) + goto err; + + mutex_unlock(&ddata->lock); + + dsicm_bl_power(ddata, true); + + return; +err: + dev_dbg(&ddata->pdev->dev, "enable failed (%d)\n", r); + mutex_unlock(&ddata->lock); +} + +static void dsicm_disable(struct omap_dss_device *dssdev) +{ + struct panel_drv_data *ddata = to_panel_data(dssdev); + struct omap_dss_device *src = ddata->src; + int r; + + dsicm_bl_power(ddata, false); + + mutex_lock(&ddata->lock); + + dsicm_cancel_ulps_work(ddata); + + src->ops->dsi.bus_lock(src); + + r = dsicm_wake_up(ddata); + if (!r) + dsicm_power_off(ddata); + + src->ops->dsi.bus_unlock(src); + + mutex_unlock(&ddata->lock); +} + +static void dsicm_framedone_cb(int err, void *data) +{ + struct panel_drv_data *ddata = data; + struct omap_dss_device *src = ddata->src; + + dev_dbg(&ddata->pdev->dev, "framedone, err %d\n", err); + src->ops->dsi.bus_unlock(src); +} + +static irqreturn_t dsicm_te_isr(int irq, void *data) +{ + struct panel_drv_data *ddata = data; + struct omap_dss_device *src = ddata->src; + int old; + int r; + + old = atomic_cmpxchg(&ddata->do_update, 1, 0); + + if (old) { + cancel_delayed_work(&ddata->te_timeout_work); + + r = src->ops->dsi.update(src, ddata->channel, dsicm_framedone_cb, + ddata); + if (r) + goto err; + } + + return IRQ_HANDLED; +err: + dev_err(&ddata->pdev->dev, "start update failed\n"); + src->ops->dsi.bus_unlock(src); + return IRQ_HANDLED; +} + +static void dsicm_te_timeout_work_callback(struct work_struct *work) +{ + struct panel_drv_data *ddata = container_of(work, struct panel_drv_data, + te_timeout_work.work); + struct omap_dss_device *src = ddata->src; + + dev_err(&ddata->pdev->dev, "TE not received for 250ms!\n"); + + atomic_set(&ddata->do_update, 0); + src->ops->dsi.bus_unlock(src); +} + +static int dsicm_update(struct omap_dss_device *dssdev, + u16 x, u16 y, u16 w, u16 h) +{ + struct panel_drv_data *ddata = to_panel_data(dssdev); + struct omap_dss_device *src = ddata->src; + int r; + + dev_dbg(&ddata->pdev->dev, "update %d, %d, %d x %d\n", x, y, w, h); + + mutex_lock(&ddata->lock); + src->ops->dsi.bus_lock(src); + + r = dsicm_wake_up(ddata); + if (r) + goto err; + + if (!ddata->enabled) { + r = 0; + goto err; + } + + /* XXX no need to send this every frame, but dsi break if not done */ + r = dsicm_set_update_window(ddata, 0, 0, ddata->vm.hactive, + ddata->vm.vactive); + if (r) + goto err; + + if (ddata->te_enabled && ddata->ext_te_gpio) { + schedule_delayed_work(&ddata->te_timeout_work, + msecs_to_jiffies(250)); + atomic_set(&ddata->do_update, 1); + } else { + r = src->ops->dsi.update(src, ddata->channel, dsicm_framedone_cb, + ddata); + if (r) + goto err; + } + + /* note: no bus_unlock here. unlock is src framedone_cb */ + mutex_unlock(&ddata->lock); + return 0; +err: + src->ops->dsi.bus_unlock(src); + mutex_unlock(&ddata->lock); + return r; +} + +static int dsicm_sync(struct omap_dss_device *dssdev) +{ + struct panel_drv_data *ddata = to_panel_data(dssdev); + struct omap_dss_device *src = ddata->src; + + dev_dbg(&ddata->pdev->dev, "sync\n"); + + mutex_lock(&ddata->lock); + src->ops->dsi.bus_lock(src); + src->ops->dsi.bus_unlock(src); + mutex_unlock(&ddata->lock); + + dev_dbg(&ddata->pdev->dev, "sync done\n"); + + return 0; +} + +static int _dsicm_enable_te(struct panel_drv_data *ddata, bool enable) +{ + struct omap_dss_device *src = ddata->src; + int r; + + if (enable) + r = dsicm_dcs_write_1(ddata, MIPI_DCS_SET_TEAR_ON, 0); + else + r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_TEAR_OFF); + + if (!ddata->ext_te_gpio) + src->ops->dsi.enable_te(src, enable); + + /* possible panel bug */ + msleep(100); + + return r; +} + +static int dsicm_enable_te(struct omap_dss_device *dssdev, bool enable) +{ + struct panel_drv_data *ddata = to_panel_data(dssdev); + struct omap_dss_device *src = ddata->src; + int r; + + mutex_lock(&ddata->lock); + + if (ddata->te_enabled == enable) + goto end; + + src->ops->dsi.bus_lock(src); + + if (ddata->enabled) { + r = dsicm_wake_up(ddata); + if (r) + goto err; + + r = _dsicm_enable_te(ddata, enable); + if (r) + goto err; + } + + ddata->te_enabled = enable; + + src->ops->dsi.bus_unlock(src); +end: + mutex_unlock(&ddata->lock); + + return 0; +err: + src->ops->dsi.bus_unlock(src); + mutex_unlock(&ddata->lock); + + return r; +} + +static int dsicm_get_te(struct omap_dss_device *dssdev) +{ + struct panel_drv_data *ddata = to_panel_data(dssdev); + int r; + + mutex_lock(&ddata->lock); + r = ddata->te_enabled; + mutex_unlock(&ddata->lock); + + return r; +} + +static int dsicm_memory_read(struct omap_dss_device *dssdev, + void *buf, size_t size, + u16 x, u16 y, u16 w, u16 h) +{ + struct panel_drv_data *ddata = to_panel_data(dssdev); + struct omap_dss_device *src = ddata->src; + int r; + int first = 1; + int plen; + unsigned int buf_used = 0; + + if (size < w * h * 3) + return -ENOMEM; + + mutex_lock(&ddata->lock); + + if (!ddata->enabled) { + r = -ENODEV; + goto err1; + } + + size = min((u32)w * h * 3, + ddata->vm.hactive * ddata->vm.vactive * 3); + + src->ops->dsi.bus_lock(src); + + r = dsicm_wake_up(ddata); + 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; + + dsicm_set_update_window(ddata, x, y, w, h); + + r = src->ops->dsi.set_max_rx_packet_size(src, ddata->channel, plen); + if (r) + goto err2; + + while (buf_used < size) { + u8 dcs_cmd = first ? 0x2e : 0x3e; + first = 0; + + r = src->ops->dsi.dcs_read(src, ddata->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(&ddata->pdev->dev, "short read\n"); + break; + } + + if (signal_pending(current)) { + dev_err(&ddata->pdev->dev, "signal pending, " + "aborting memory read\n"); + r = -ERESTARTSYS; + goto err3; + } + } + + r = buf_used; + +err3: + src->ops->dsi.set_max_rx_packet_size(src, ddata->channel, 1); +err2: + src->ops->dsi.bus_unlock(src); +err1: + mutex_unlock(&ddata->lock); + return r; +} + +static void dsicm_ulps_work(struct work_struct *work) +{ + struct panel_drv_data *ddata = container_of(work, struct panel_drv_data, + ulps_work.work); + struct omap_dss_device *dssdev = &ddata->dssdev; + struct omap_dss_device *src = ddata->src; + + mutex_lock(&ddata->lock); + + if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE || !ddata->enabled) { + mutex_unlock(&ddata->lock); + return; + } + + src->ops->dsi.bus_lock(src); + + dsicm_enter_ulps(ddata); + + src->ops->dsi.bus_unlock(src); + mutex_unlock(&ddata->lock); +} + +static int dsicm_get_modes(struct omap_dss_device *dssdev, + struct drm_connector *connector) +{ + struct panel_drv_data *ddata = to_panel_data(dssdev); + + connector->display_info.width_mm = ddata->width_mm; + connector->display_info.height_mm = ddata->height_mm; + + return omapdss_display_get_modes(connector, &ddata->vm); +} + +static int dsicm_check_timings(struct omap_dss_device *dssdev, + struct drm_display_mode *mode) +{ + struct panel_drv_data *ddata = to_panel_data(dssdev); + int ret = 0; + + if (mode->hdisplay != ddata->vm.hactive) + ret = -EINVAL; + + if (mode->vdisplay != ddata->vm.vactive) + ret = -EINVAL; + + if (ret) { + dev_warn(dssdev->dev, "wrong resolution: %d x %d", + mode->hdisplay, mode->vdisplay); + dev_warn(dssdev->dev, "panel resolution: %d x %d", + ddata->vm.hactive, ddata->vm.vactive); + } + + return ret; +} + +static const struct omap_dss_device_ops dsicm_ops = { + .connect = dsicm_connect, + .disconnect = dsicm_disconnect, + + .enable = dsicm_enable, + .disable = dsicm_disable, + + .get_modes = dsicm_get_modes, + .check_timings = dsicm_check_timings, +}; + +static const struct omap_dss_driver dsicm_dss_driver = { + .update = dsicm_update, + .sync = dsicm_sync, + + .enable_te = dsicm_enable_te, + .get_te = dsicm_get_te, + + .memory_read = dsicm_memory_read, +}; + +static int dsicm_probe_of(struct platform_device *pdev) +{ + struct device_node *node = pdev->dev.of_node; + struct backlight_device *backlight; + struct panel_drv_data *ddata = platform_get_drvdata(pdev); + struct display_timing timing; + int err; + + ddata->reset_gpio = devm_gpiod_get(&pdev->dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR(ddata->reset_gpio)) { + err = PTR_ERR(ddata->reset_gpio); + dev_err(&pdev->dev, "reset gpio request failed: %d", err); + return err; + } + + ddata->ext_te_gpio = devm_gpiod_get_optional(&pdev->dev, "te", + GPIOD_IN); + if (IS_ERR(ddata->ext_te_gpio)) { + err = PTR_ERR(ddata->ext_te_gpio); + dev_err(&pdev->dev, "TE gpio request failed: %d", err); + return err; + } + + err = of_get_display_timing(node, "panel-timing", &timing); + if (!err) { + videomode_from_timing(&timing, &ddata->vm); + if (!ddata->vm.pixelclock) + ddata->vm.pixelclock = + ddata->vm.hactive * ddata->vm.vactive * 60; + } else { + dev_warn(&pdev->dev, + "failed to get video timing, using defaults\n"); + } + + ddata->width_mm = 0; + of_property_read_u32(node, "width-mm", &ddata->width_mm); + + ddata->height_mm = 0; + of_property_read_u32(node, "height-mm", &ddata->height_mm); + + ddata->vpnl = devm_regulator_get_optional(&pdev->dev, "vpnl"); + if (IS_ERR(ddata->vpnl)) { + err = PTR_ERR(ddata->vpnl); + if (err == -EPROBE_DEFER) + return err; + ddata->vpnl = NULL; + } + + ddata->vddi = devm_regulator_get_optional(&pdev->dev, "vddi"); + if (IS_ERR(ddata->vddi)) { + err = PTR_ERR(ddata->vddi); + if (err == -EPROBE_DEFER) + return err; + ddata->vddi = NULL; + } + + backlight = devm_of_find_backlight(&pdev->dev); + if (IS_ERR(backlight)) + return PTR_ERR(backlight); + + /* If no backlight device is found assume native backlight support */ + if (backlight) + ddata->extbldev = backlight; + else + ddata->use_dsi_backlight = true; + + /* TODO: ulps */ + + return 0; +} + +static int dsicm_probe(struct platform_device *pdev) +{ + struct panel_drv_data *ddata; + struct backlight_device *bldev = NULL; + struct device *dev = &pdev->dev; + struct omap_dss_device *dssdev; + int r; + + dev_dbg(dev, "probe\n"); + + ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL); + if (!ddata) + return -ENOMEM; + + platform_set_drvdata(pdev, ddata); + ddata->pdev = pdev; + + ddata->vm.hactive = 864; + ddata->vm.vactive = 480; + ddata->vm.pixelclock = 864 * 480 * 60; + + r = dsicm_probe_of(pdev); + if (r) + return r; + + dssdev = &ddata->dssdev; + dssdev->dev = dev; + dssdev->ops = &dsicm_ops; + dssdev->driver = &dsicm_dss_driver; + dssdev->type = OMAP_DISPLAY_TYPE_DSI; + dssdev->display = true; + dssdev->owner = THIS_MODULE; + dssdev->of_port = 0; + dssdev->ops_flags = OMAP_DSS_DEVICE_OP_MODES; + + dssdev->caps = OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE | + OMAP_DSS_DISPLAY_CAP_TEAR_ELIM; + + omapdss_display_init(dssdev); + omapdss_device_register(dssdev); + + mutex_init(&ddata->lock); + + atomic_set(&ddata->do_update, 0); + + if (ddata->ext_te_gpio) { + r = devm_request_irq(dev, gpiod_to_irq(ddata->ext_te_gpio), + dsicm_te_isr, + IRQF_TRIGGER_RISING, + "taal vsync", ddata); + + if (r) { + dev_err(dev, "IRQ request failed\n"); + goto err_reg; + } + + INIT_DEFERRABLE_WORK(&ddata->te_timeout_work, + dsicm_te_timeout_work_callback); + + dev_dbg(dev, "Using GPIO TE\n"); + } + + ddata->workqueue = create_singlethread_workqueue("dsicm_wq"); + if (!ddata->workqueue) { + r = -ENOMEM; + goto err_reg; + } + INIT_DELAYED_WORK(&ddata->ulps_work, dsicm_ulps_work); + + dsicm_hw_reset(ddata); + + if (ddata->use_dsi_backlight) { + struct backlight_properties props = { 0 }; + props.max_brightness = 255; + props.type = BACKLIGHT_RAW; + + bldev = devm_backlight_device_register(dev, dev_name(dev), + dev, ddata, &dsicm_bl_ops, &props); + if (IS_ERR(bldev)) { + r = PTR_ERR(bldev); + goto err_bl; + } + + ddata->bldev = bldev; + } + + r = sysfs_create_group(&dev->kobj, &dsicm_attr_group); + if (r) { + dev_err(dev, "failed to create sysfs files\n"); + goto err_bl; + } + + return 0; + +err_bl: + destroy_workqueue(ddata->workqueue); +err_reg: + if (ddata->extbldev) + put_device(&ddata->extbldev->dev); + + return r; +} + +static int __exit dsicm_remove(struct platform_device *pdev) +{ + struct panel_drv_data *ddata = platform_get_drvdata(pdev); + struct omap_dss_device *dssdev = &ddata->dssdev; + + dev_dbg(&pdev->dev, "remove\n"); + + omapdss_device_unregister(dssdev); + + if (omapdss_device_is_enabled(dssdev)) + dsicm_disable(dssdev); + omapdss_device_disconnect(ddata->src, dssdev); + + sysfs_remove_group(&pdev->dev.kobj, &dsicm_attr_group); + + if (ddata->extbldev) + put_device(&ddata->extbldev->dev); + + dsicm_cancel_ulps_work(ddata); + destroy_workqueue(ddata->workqueue); + + /* reset, to be sure that the panel is in a valid state */ + dsicm_hw_reset(ddata); + + return 0; +} + +static const struct of_device_id dsicm_of_match[] = { + { .compatible = "omapdss,panel-dsi-cm", }, + {}, +}; + +MODULE_DEVICE_TABLE(of, dsicm_of_match); + +static struct platform_driver dsicm_driver = { + .probe = dsicm_probe, + .remove = __exit_p(dsicm_remove), + .driver = { + .name = "panel-dsi-cm", + .of_match_table = dsicm_of_match, + .suppress_bind_attrs = true, + }, +}; + +module_platform_driver(dsicm_driver); + +MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>"); +MODULE_DESCRIPTION("Generic DSI Command Mode Panel Driver"); +MODULE_LICENSE("GPL"); |