Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756627AbdGXRiz (ORCPT ); Mon, 24 Jul 2017 13:38:55 -0400 Received: from bhuna.collabora.co.uk ([46.235.227.227]:59045 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932924AbdGXRdy (ORCPT ); Mon, 24 Jul 2017 13:33:54 -0400 From: Sebastian Reichel To: Sebastian Reichel , Tomi Valkeinen , Tony Lindgren Cc: Laurent Pinchart , dri-devel@lists.freedesktop.org, linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org, Sebastian Reichel Subject: [PATCHv1 11/14] drm/omap: panel-dsi-cm: add external backlight support Date: Mon, 24 Jul 2017 19:33:08 +0200 Message-Id: <20170724173311.27170-12-sebastian.reichel@collabora.co.uk> X-Mailer: git-send-email 2.13.2 In-Reply-To: <20170724173311.27170-1-sebastian.reichel@collabora.co.uk> References: <20170724173311.27170-1-sebastian.reichel@collabora.co.uk> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6717 Lines: 241 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 --- drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c | 91 ++++++++++++++++--------- 1 file changed, 60 insertions(+), 31 deletions(-) diff --git a/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c b/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c index b50b1e81b2f5..1eeb8b0d10c2 100644 --- 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 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); @@ -343,7 +368,7 @@ 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 r = 0; int level; if (dev->props.fb_blank == FB_BLANK_UNBLANK && @@ -364,8 +389,6 @@ static int dsicm_bl_update_status(struct backlight_device *dev) 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_device *dssdev) 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_dss_device *dssdev) 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 platform_device *pdev) 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_device *pdev) 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_device *pdev) 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_device *pdev) 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_device *pdev) } 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 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"); @@ -1408,12 +1441,8 @@ static int __exit dsicm_remove(struct platform_device *pdev) 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); -- 2.13.2