From: Sebastian Reichel Date: Mon, 24 Jul 2017 19:33:08 +0200 Subject: drm/omap: panel-dsi-cm: add external backlight support Git-commit: a44e552a1f4371a02473da5448add5320a01f5ff Patch-mainline: v4.16-rc1 References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166 Droid 4 has a command mode DSI panel, which does not have/use DSI based backlight support. This adds proper support for this using a backlight phandle property, which follows the common panel binding. If no backlight phandle is found, it is assumed, that the native backlight should be used instead. This is used by the Nokia N950. Signed-off-by: Sebastian Reichel Signed-off-by: Tomi Valkeinen Acked-by: Petr Tesarik --- drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c | 91 +++++++++++++++--------- 1 file changed, 60 insertions(+), 31 deletions(-) --- a/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c +++ b/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c @@ -51,6 +51,7 @@ struct panel_drv_data { 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 @@ -100,6 +101,30 @@ static int dsicm_panel_reset(struct pane 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); @@ -343,7 +368,7 @@ static int dsicm_bl_update_status(struct { struct panel_drv_data *ddata = dev_get_drvdata(&dev->dev); struct omap_dss_device *in = ddata->in; - int r; + int r = 0; int level; if (dev->props.fb_blank == FB_BLANK_UNBLANK && @@ -364,8 +389,6 @@ static int dsicm_bl_update_status(struct r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, level); in->ops.dsi->bus_unlock(in); - } else { - r = 0; } mutex_unlock(&ddata->lock); @@ -819,6 +842,8 @@ static int dsicm_enable(struct omap_dss_ mutex_unlock(&ddata->lock); + dsicm_bl_power(ddata, true); + return 0; err: dev_dbg(&ddata->pdev->dev, "enable failed\n"); @@ -834,6 +859,8 @@ static void dsicm_disable(struct omap_ds dev_dbg(&ddata->pdev->dev, "disable\n"); + dsicm_bl_power(ddata, false); + mutex_lock(&ddata->lock); dsicm_cancel_ulps_work(ddata); @@ -1198,6 +1225,7 @@ static struct omap_dss_driver dsicm_ops static int dsicm_probe_of(struct platform_device *pdev) { struct device_node *node = pdev->dev.of_node; + struct device_node *backlight; struct panel_drv_data *ddata = platform_get_drvdata(pdev); struct omap_dss_device *in; struct display_timing timing; @@ -1259,14 +1287,25 @@ static int dsicm_probe_of(struct platfor ddata->in = in; - /* TODO: ulps, backlight */ + backlight = of_parse_phandle(node, "backlight", 0); + if (backlight) { + ddata->extbldev = of_find_backlight_by_node(backlight); + of_node_put(backlight); + + if (!ddata->extbldev) + return -EPROBE_DEFER; + } else { + /* assume native backlight support */ + ddata->use_dsi_backlight = true; + } + + /* TODO: ulps */ 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; @@ -1319,7 +1358,7 @@ static int dsicm_probe(struct platform_d GPIOF_OUT_INIT_LOW, "taal rst"); if (r) { dev_err(dev, "failed to request reset gpio\n"); - return r; + goto err_reg; } } @@ -1328,7 +1367,7 @@ static int dsicm_probe(struct platform_d GPIOF_IN, "taal irq"); if (r) { dev_err(dev, "GPIO request failed\n"); - return r; + goto err_reg; } r = devm_request_irq(dev, gpio_to_irq(ddata->ext_te_gpio), @@ -1338,7 +1377,7 @@ static int dsicm_probe(struct platform_d if (r) { dev_err(dev, "IRQ request failed\n"); - return r; + goto err_reg; } INIT_DEFERRABLE_WORK(&ddata->te_timeout_work, @@ -1348,48 +1387,43 @@ static int dsicm_probe(struct platform_d } ddata->workqueue = create_singlethread_workqueue("dsicm_wq"); - if (ddata->workqueue == NULL) { - dev_err(dev, "can't create workqueue\n"); - return -ENOMEM; + 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) { - memset(&props, 0, sizeof(props)); + struct backlight_properties props = { 0 }; props.max_brightness = 255; - props.type = BACKLIGHT_RAW; - bldev = backlight_device_register(dev_name(dev), - dev, ddata, &dsicm_bl_ops, &props); + + 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; - - 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; + goto err_bl; } return 0; -err_sysfs_create: - backlight_device_unregister(bldev); err_bl: destroy_workqueue(ddata->workqueue); err_reg: + if (ddata->extbldev) + put_device(&ddata->extbldev->dev); + return r; } @@ -1397,7 +1431,6 @@ static int __exit dsicm_remove(struct pl { 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"); @@ -1408,12 +1441,8 @@ static int __exit dsicm_remove(struct pl 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); - } + if (ddata->extbldev) + put_device(&ddata->extbldev->dev); omap_dss_put_device(ddata->in);