--- /dev/null
+/*
+ * Generic DSI Command Mode panel driver
+ *
+ * Copyright (C) 2013 Texas Instruments
+ * Author: Tomi Valkeinen <tomi.valkeinen@ti.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.
+ */
+
+/* #define DEBUG */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/fb.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/jiffies.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.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_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 *in;
+
+ struct omap_video_timings timings;
+
+ struct platform_device *pdev;
+
+ 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 */
+
+ /* 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 intro_printed;
+
+ struct workqueue_struct *workqueue;
+
+ bool ulps_enabled;
+ unsigned 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 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 *in = ddata->in;
+ int r;
+ u8 buf[1];
+
+ r = in->ops.dsi->dcs_read(in, 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 *in = ddata->in;
+ return in->ops.dsi->dcs_write(in, 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 *in = ddata->in;
+ u8 buf[2] = { dcs_cmd, param };
+
+ return in->ops.dsi->dcs_write(in, ddata->channel, buf, 2);
+}
+
+static int dsicm_sleep_in(struct panel_drv_data *ddata)
+
+{
+ struct omap_dss_device *in = ddata->in;
+ u8 cmd;
+ int r;
+
+ hw_guard_wait(ddata);
+
+ cmd = MIPI_DCS_ENTER_SLEEP_MODE;
+ r = in->ops.dsi->dcs_write_nosync(in, 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 *in = ddata->in;
+ 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 = in->ops.dsi->dcs_write_nosync(in, 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 = in->ops.dsi->dcs_write_nosync(in, ddata->channel, buf, sizeof(buf));
+ if (r)
+ return r;
+
+ in->ops.dsi->bta_sync(in, 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 *in = ddata->in;
+ int r;
+
+ if (ddata->ulps_enabled)
+ return 0;
+
+ dsicm_cancel_ulps_work(ddata);
+
+ r = _dsicm_enable_te(ddata, false);
+ if (r)
+ goto err;
+
+ if (gpio_is_valid(ddata->ext_te_gpio))
+ disable_irq(gpio_to_irq(ddata->ext_te_gpio));
+
+ in->ops.dsi->disable(in, 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 *in = ddata->in;
+ int r;
+
+ if (!ddata->ulps_enabled)
+ return 0;
+
+ r = in->ops.dsi->enable(in);
+ if (r) {
+ dev_err(&ddata->pdev->dev, "failed to enable DSI\n");
+ goto err1;
+ }
+
+ in->ops.dsi->enable_hs(in, ddata->channel, true);
+
+ r = _dsicm_enable_te(ddata, true);
+ if (r) {
+ dev_err(&ddata->pdev->dev, "failed to re-enable TE");
+ goto err2;
+ }
+
+ if (gpio_is_valid(ddata->ext_te_gpio))
+ enable_irq(gpio_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 (gpio_is_valid(ddata->ext_te_gpio))
+ enable_irq(gpio_to_irq(ddata->ext_te_gpio));
+ ddata->ulps_enabled = false;
+ }
+err1:
+ 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 *in = ddata->in;
+ 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(&ddata->pdev->dev, "update brightness to %d\n", level);
+
+ mutex_lock(&ddata->lock);
+
+ if (ddata->enabled) {
+ in->ops.dsi->bus_lock(in);
+
+ r = dsicm_wake_up(ddata);
+ if (!r)
+ r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, level);
+
+ in->ops.dsi->bus_unlock(in);
+ } else {
+ r = 0;
+ }
+
+ 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 void dsicm_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 dsicm_num_errors_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+ struct omap_dss_device *in = ddata->in;
+ u8 errors = 0;
+ int r;
+
+ mutex_lock(&ddata->lock);
+
+ if (ddata->enabled) {
+ in->ops.dsi->bus_lock(in);
+
+ r = dsicm_wake_up(ddata);
+ if (!r)
+ r = dsicm_dcs_read_1(ddata, DCS_READ_NUM_ERRORS,
+ &errors);
+
+ in->ops.dsi->bus_unlock(in);
+ } 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 platform_device *pdev = to_platform_device(dev);
+ struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+ struct omap_dss_device *in = ddata->in;
+ u8 id1, id2, id3;
+ int r;
+
+ mutex_lock(&ddata->lock);
+
+ if (ddata->enabled) {
+ in->ops.dsi->bus_lock(in);
+
+ r = dsicm_wake_up(ddata);
+ if (!r)
+ r = dsicm_get_id(ddata, &id1, &id2, &id3);
+
+ in->ops.dsi->bus_unlock(in);
+ } 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 platform_device *pdev = to_platform_device(dev);
+ struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+ struct omap_dss_device *in = ddata->in;
+ unsigned long t;
+ int r;
+
+ r = kstrtoul(buf, 0, &t);
+ if (r)
+ return r;
+
+ mutex_lock(&ddata->lock);
+
+ if (ddata->enabled) {
+ in->ops.dsi->bus_lock(in);
+
+ if (t)
+ r = dsicm_enter_ulps(ddata);
+ else
+ r = dsicm_wake_up(ddata);
+
+ in->ops.dsi->bus_unlock(in);
+ }
+
+ 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 platform_device *pdev = to_platform_device(dev);
+ struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+ unsigned 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 platform_device *pdev = to_platform_device(dev);
+ struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+ struct omap_dss_device *in = ddata->in;
+ 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 */
+ in->ops.dsi->bus_lock(in);
+ r = dsicm_wake_up(ddata);
+ in->ops.dsi->bus_unlock(in);
+ }
+
+ 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 platform_device *pdev = to_platform_device(dev);
+ struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+ unsigned 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 struct attribute_group dsicm_attr_group = {
+ .attrs = dsicm_attrs,
+};
+
+static void dsicm_hw_reset(struct panel_drv_data *ddata)
+{
+ if (!gpio_is_valid(ddata->reset_gpio))
+ return;
+
+ gpio_set_value(ddata->reset_gpio, 1);
+ udelay(10);
+ /* reset the panel */
+ gpio_set_value(ddata->reset_gpio, 0);
+ /* assert reset */
+ udelay(10);
+ gpio_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 *in = ddata->in;
+ 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 = &ddata->timings,
+ .hs_clk_min = 150000000,
+ .hs_clk_max = 300000000,
+ .lp_clk_min = 7000000,
+ .lp_clk_max = 10000000,
+ };
+
+ if (ddata->pin_config.num_pins > 0) {
+ r = in->ops.dsi->configure_pins(in, &ddata->pin_config);
+ if (r) {
+ dev_err(&ddata->pdev->dev,
+ "failed to configure DSI pins\n");
+ goto err0;
+ }
+ }
+
+ r = in->ops.dsi->set_config(in, &dsi_config);
+ if (r) {
+ dev_err(&ddata->pdev->dev, "failed to configure DSI\n");
+ goto err0;
+ }
+
+ r = in->ops.dsi->enable(in);
+ if (r) {
+ dev_err(&ddata->pdev->dev, "failed to enable DSI\n");
+ goto err0;
+ }
+
+ dsicm_hw_reset(ddata);
+
+ in->ops.dsi->enable_hs(in, 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 = in->ops.dsi->enable_video_output(in, ddata->channel);
+ if (r)
+ goto err;
+
+ ddata->enabled = 1;
+
+ if (!ddata->intro_printed) {
+ dev_info(&ddata->pdev->dev, "panel revision %02x.%02x.%02x\n",
+ id1, id2, id3);
+ ddata->intro_printed = true;
+ }
+
+ in->ops.dsi->enable_hs(in, ddata->channel, true);
+
+ return 0;
+err:
+ dev_err(&ddata->pdev->dev, "error while enabling panel, issuing HW reset\n");
+
+ dsicm_hw_reset(ddata);
+
+ in->ops.dsi->disable(in, true, false);
+err0:
+ return r;
+}
+
+static void dsicm_power_off(struct panel_drv_data *ddata)
+{
+ struct omap_dss_device *in = ddata->in;
+ int r;
+
+ in->ops.dsi->disable_video_output(in, 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);
+ }
+
+ in->ops.dsi->disable(in, true, false);
+
+ ddata->enabled = 0;
+}
+
+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 *dssdev)
+{
+ struct panel_drv_data *ddata = to_panel_data(dssdev);
+ struct omap_dss_device *in = ddata->in;
+ struct device *dev = &ddata->pdev->dev;
+ int r;
+
+ if (omapdss_device_is_connected(dssdev))
+ return 0;
+
+ r = in->ops.dsi->connect(in, dssdev);
+ if (r) {
+ dev_err(dev, "Failed to connect to video source\n");
+ return r;
+ }
+
+ r = in->ops.dsi->request_vc(ddata->in, &ddata->channel);
+ if (r) {
+ dev_err(dev, "failed to get virtual channel\n");
+ goto err_req_vc;
+ }
+
+ r = in->ops.dsi->set_vc_id(ddata->in, ddata->channel, TCH);
+ if (r) {
+ dev_err(dev, "failed to set VC_ID\n");
+ goto err_vc_id;
+ }
+
+ return 0;
+
+err_vc_id:
+ in->ops.dsi->release_vc(ddata->in, ddata->channel);
+err_req_vc:
+ in->ops.dsi->disconnect(in, dssdev);
+ return r;
+}
+
+static void dsicm_disconnect(struct omap_dss_device *dssdev)
+{
+ struct panel_drv_data *ddata = to_panel_data(dssdev);
+ struct omap_dss_device *in = ddata->in;
+
+ if (!omapdss_device_is_connected(dssdev))
+ return;
+
+ in->ops.dsi->release_vc(in, ddata->channel);
+ in->ops.dsi->disconnect(in, dssdev);
+}
+
+static int dsicm_enable(struct omap_dss_device *dssdev)
+{
+ struct panel_drv_data *ddata = to_panel_data(dssdev);
+ struct omap_dss_device *in = ddata->in;
+ int r;
+
+ dev_dbg(&ddata->pdev->dev, "enable\n");
+
+ mutex_lock(&ddata->lock);
+
+ if (!omapdss_device_is_connected(dssdev)) {
+ r = -ENODEV;
+ goto err;
+ }
+
+ if (omapdss_device_is_enabled(dssdev)) {
+ r = 0;
+ goto err;
+ }
+
+ in->ops.dsi->bus_lock(in);
+
+ r = dsicm_power_on(ddata);
+
+ in->ops.dsi->bus_unlock(in);
+
+ if (r)
+ goto err;
+
+ dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
+
+ mutex_unlock(&ddata->lock);
+
+ return 0;
+err:
+ dev_dbg(&ddata->pdev->dev, "enable failed\n");
+ mutex_unlock(&ddata->lock);
+ return r;
+}
+
+static void dsicm_disable(struct omap_dss_device *dssdev)
+{
+ struct panel_drv_data *ddata = to_panel_data(dssdev);
+ struct omap_dss_device *in = ddata->in;
+ int r;
+
+ dev_dbg(&ddata->pdev->dev, "disable\n");
+
+ mutex_lock(&ddata->lock);
+
+ dsicm_cancel_ulps_work(ddata);
+
+ in->ops.dsi->bus_lock(in);
+
+ if (omapdss_device_is_enabled(dssdev)) {
+ r = dsicm_wake_up(ddata);
+ if (!r)
+ dsicm_power_off(ddata);
+ }
+
+ in->ops.dsi->bus_unlock(in);
+
+ dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
+
+ mutex_unlock(&ddata->lock);
+}
+
+static void dsicm_framedone_cb(int err, void *data)
+{
+ struct panel_drv_data *ddata = data;
+ struct omap_dss_device *in = ddata->in;
+
+ dev_dbg(&ddata->pdev->dev, "framedone, err %d\n", err);
+ in->ops.dsi->bus_unlock(ddata->in);
+}
+
+static irqreturn_t dsicm_te_isr(int irq, void *data)
+{
+ struct panel_drv_data *ddata = data;
+ struct omap_dss_device *in = ddata->in;
+ int old;
+ int r;
+
+ old = atomic_cmpxchg(&ddata->do_update, 1, 0);
+
+ if (old) {
+ cancel_delayed_work(&ddata->te_timeout_work);
+
+ r = in->ops.dsi->update(in, ddata->channel, dsicm_framedone_cb,
+ ddata);
+ if (r)
+ goto err;
+ }
+
+ return IRQ_HANDLED;
+err:
+ dev_err(&ddata->pdev->dev, "start update failed\n");
+ in->ops.dsi->bus_unlock(in);
+ 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 *in = ddata->in;
+
+ dev_err(&ddata->pdev->dev, "TE not received for 250ms!\n");
+
+ atomic_set(&ddata->do_update, 0);
+ in->ops.dsi->bus_unlock(in);
+}
+
+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 *in = ddata->in;
+ int r;
+
+ dev_dbg(&ddata->pdev->dev, "update %d, %d, %d x %d\n", x, y, w, h);
+
+ mutex_lock(&ddata->lock);
+ in->ops.dsi->bus_lock(in);
+
+ 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,
+ dssdev->panel.timings.x_res,
+ dssdev->panel.timings.y_res);
+ if (r)
+ goto err;
+
+ if (ddata->te_enabled && gpio_is_valid(ddata->ext_te_gpio)) {
+ schedule_delayed_work(&ddata->te_timeout_work,
+ msecs_to_jiffies(250));
+ atomic_set(&ddata->do_update, 1);
+ } else {
+ r = in->ops.dsi->update(in, ddata->channel, dsicm_framedone_cb,
+ ddata);
+ if (r)
+ goto err;
+ }
+
+ /* note: no bus_unlock here. unlock is in framedone_cb */
+ mutex_unlock(&ddata->lock);
+ return 0;
+err:
+ in->ops.dsi->bus_unlock(in);
+ 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 *in = ddata->in;
+
+ dev_dbg(&ddata->pdev->dev, "sync\n");
+
+ mutex_lock(&ddata->lock);
+ in->ops.dsi->bus_lock(in);
+ in->ops.dsi->bus_unlock(in);
+ 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 *in = ddata->in;
+ 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 (!gpio_is_valid(ddata->ext_te_gpio))
+ in->ops.dsi->enable_te(in, 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 *in = ddata->in;
+ int r;
+
+ mutex_lock(&ddata->lock);
+
+ if (ddata->te_enabled == enable)
+ goto end;
+
+ in->ops.dsi->bus_lock(in);
+
+ 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;
+
+ in->ops.dsi->bus_unlock(in);
+end:
+ mutex_unlock(&ddata->lock);
+
+ return 0;
+err:
+ in->ops.dsi->bus_unlock(in);
+ 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 *in = ddata->in;
+ int r;
+ int first = 1;
+ int plen;
+ unsigned buf_used = 0;
+
+ if (size < w * h * 3)
+ return -ENOMEM;
+
+ mutex_lock(&ddata->lock);
+
+ if (!ddata->enabled) {
+ r = -ENODEV;
+ goto err1;
+ }
+
+ size = min(w * h * 3,
+ dssdev->panel.timings.x_res *
+ dssdev->panel.timings.y_res * 3);
+
+ in->ops.dsi->bus_lock(in);
+
+ 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 = in->ops.dsi->set_max_rx_packet_size(in, ddata->channel, plen);
+ if (r)
+ goto err2;
+
+ while (buf_used < size) {
+ u8 dcs_cmd = first ? 0x2e : 0x3e;
+ first = 0;
+
+ r = in->ops.dsi->dcs_read(in, 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:
+ in->ops.dsi->set_max_rx_packet_size(in, ddata->channel, 1);
+err2:
+ in->ops.dsi->bus_unlock(in);
+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 *in = ddata->in;
+
+ mutex_lock(&ddata->lock);
+
+ if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE || !ddata->enabled) {
+ mutex_unlock(&ddata->lock);
+ return;
+ }
+
+ in->ops.dsi->bus_lock(in);
+
+ dsicm_enter_ulps(ddata);
+
+ in->ops.dsi->bus_unlock(in);
+ mutex_unlock(&ddata->lock);
+}
+
+static struct omap_dss_driver dsicm_ops = {
+ .connect = dsicm_connect,
+ .disconnect = dsicm_disconnect,
+
+ .enable = dsicm_enable,
+ .disable = dsicm_disable,
+
+ .update = dsicm_update,
+ .sync = dsicm_sync,
+
+ .get_resolution = dsicm_get_resolution,
+ .get_recommended_bpp = omapdss_default_get_recommended_bpp,
+
+ .enable_te = dsicm_enable_te,
+ .get_te = dsicm_get_te,
+
+ .memory_read = dsicm_memory_read,
+};
+
+static int dsicm_probe_pdata(struct platform_device *pdev)
+{
+ const struct panel_dsicm_platform_data *pdata;
+ struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+ struct omap_dss_device *dssdev, *in;
+
+ pdata = dev_get_platdata(&pdev->dev);
+
+ in = omap_dss_find_output(pdata->source);
+ if (in == NULL) {
+ dev_err(&pdev->dev, "failed to find video source\n");
+ return -EPROBE_DEFER;
+ }
+ ddata->in = in;
+
+ ddata->reset_gpio = pdata->reset_gpio;
+
+ if (pdata->use_ext_te)
+ ddata->ext_te_gpio = pdata->ext_te_gpio;
+ else
+ ddata->ext_te_gpio = -1;
+
+ ddata->ulps_timeout = pdata->ulps_timeout;
+
+ ddata->use_dsi_backlight = pdata->use_dsi_backlight;
+
+ ddata->pin_config = pdata->pin_config;
+
+ dssdev = &ddata->dssdev;
+ dssdev->name = pdata->name;
+
+ return 0;
+}
+
+static int dsicm_probe_of(struct platform_device *pdev)
+{
+ struct device_node *node = pdev->dev.of_node;
+ struct panel_drv_data *ddata = platform_get_drvdata(pdev);
+ struct omap_dss_device *in;
+ int gpio;
+
+ gpio = of_get_named_gpio(node, "reset-gpios", 0);
+ if (!gpio_is_valid(gpio)) {
+ dev_err(&pdev->dev, "failed to parse reset gpio\n");
+ return gpio;
+ }
+ ddata->reset_gpio = gpio;
+
+ gpio = of_get_named_gpio(node, "te-gpios", 0);
+ if (gpio_is_valid(gpio) || gpio == -ENOENT) {
+ ddata->ext_te_gpio = gpio;
+ } else {
+ dev_err(&pdev->dev, "failed to parse TE gpio\n");
+ return gpio;
+ }
+
+ in = omapdss_of_find_source_for_first_ep(node);
+ if (IS_ERR(in)) {
+ dev_err(&pdev->dev, "failed to find video source\n");
+ return PTR_ERR(in);
+ }
+
+ ddata->in = in;
+
+ /* TODO: ulps, backlight */
+
+ return 0;
+}
+
+static int dsicm_probe(struct platform_device *pdev)
+{
+ struct backlight_properties props;
+ 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;
+
+ if (dev_get_platdata(dev)) {
+ r = dsicm_probe_pdata(pdev);
+ if (r)
+ return r;
+ } else if (pdev->dev.of_node) {
+ r = dsicm_probe_of(pdev);
+ if (r)
+ return r;
+ } else {
+ return -ENODEV;
+ }
+
+ ddata->timings.x_res = 864;
+ ddata->timings.y_res = 480;
+ ddata->timings.pixelclock = 864 * 480 * 60;
+
+ dssdev = &ddata->dssdev;
+ dssdev->dev = dev;
+ dssdev->driver = &dsicm_ops;
+ dssdev->panel.timings = ddata->timings;
+ dssdev->type = OMAP_DISPLAY_TYPE_DSI;
+ dssdev->owner = THIS_MODULE;
+
+ dssdev->panel.dsi_pix_fmt = OMAP_DSS_DSI_FMT_RGB888;
+ dssdev->caps = OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE |
+ OMAP_DSS_DISPLAY_CAP_TEAR_ELIM;
+
+ r = omapdss_register_display(dssdev);
+ if (r) {
+ dev_err(dev, "Failed to register panel\n");
+ goto err_reg;
+ }
+
+ mutex_init(&ddata->lock);
+
+ atomic_set(&ddata->do_update, 0);
+
+ if (gpio_is_valid(ddata->reset_gpio)) {
+ r = devm_gpio_request_one(dev, ddata->reset_gpio,
+ GPIOF_OUT_INIT_LOW, "taal rst");
+ if (r) {
+ dev_err(dev, "failed to request reset gpio\n");
+ return r;
+ }
+ }
+
+ if (gpio_is_valid(ddata->ext_te_gpio)) {
+ r = devm_gpio_request_one(dev, ddata->ext_te_gpio,
+ GPIOF_IN, "taal irq");
+ if (r) {
+ dev_err(dev, "GPIO request failed\n");
+ return r;
+ }
+
+ r = devm_request_irq(dev, gpio_to_irq(ddata->ext_te_gpio),
+ dsicm_te_isr,
+ IRQF_TRIGGER_RISING,
+ "taal vsync", ddata);
+
+ if (r) {
+ dev_err(dev, "IRQ request failed\n");
+ return r;
+ }
+
+ 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 == NULL) {
+ dev_err(dev, "can't create workqueue\n");
+ return -ENOMEM;
+ }
+ INIT_DELAYED_WORK(&ddata->ulps_work, dsicm_ulps_work);
+
+ dsicm_hw_reset(ddata);
+
+ if (ddata->use_dsi_backlight) {
+ memset(&props, 0, sizeof(struct backlight_properties));
+ props.max_brightness = 255;
+
+ props.type = BACKLIGHT_RAW;
+ bldev = backlight_device_register(dev_name(dev),
+ dev, ddata, &dsicm_bl_ops, &props);
+ if (IS_ERR(bldev)) {
+ r = PTR_ERR(bldev);
+ goto err_bl;
+ }
+
+ ddata->bldev = bldev;
+
+ bldev->props.fb_blank = FB_BLANK_UNBLANK;
+ bldev->props.power = FB_BLANK_UNBLANK;
+ bldev->props.brightness = 255;
+
+ dsicm_bl_update_status(bldev);
+ }
+
+ r = sysfs_create_group(&dev->kobj, &dsicm_attr_group);
+ if (r) {
+ dev_err(dev, "failed to create sysfs files\n");
+ goto err_sysfs_create;
+ }
+
+ return 0;
+
+err_sysfs_create:
+ if (bldev != NULL)
+ backlight_device_unregister(bldev);
+err_bl:
+ destroy_workqueue(ddata->workqueue);
+err_reg:
+ 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;
+ struct backlight_device *bldev;
+
+ dev_dbg(&pdev->dev, "remove\n");
+
+ omapdss_unregister_display(dssdev);
+
+ dsicm_disable(dssdev);
+ dsicm_disconnect(dssdev);
+
+ sysfs_remove_group(&pdev->dev.kobj, &dsicm_attr_group);
+
+ bldev = ddata->bldev;
+ if (bldev != NULL) {
+ bldev->props.power = FB_BLANK_POWERDOWN;
+ dsicm_bl_update_status(bldev);
+ backlight_device_unregister(bldev);
+ }
+
+ omap_dss_put_device(ddata->in);
+
+ 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");
Code Review / kvmfornfv.git / blobdiff