From 18c44db8cafe9bda4fcb51bfc05c1f1d7cefc44c Mon Sep 17 00:00:00 2001 From: Ezequiel Garcia Date: Tue, 2 Sep 2014 09:51:20 -0300 Subject: drm/tilcdc: panel: Fix backlight devicetree support The current backlight support is broken; the driver expects a backlight-class in the panel devicetree node. Fix this by implementing it properly, getting an optional backlight from a phandle. This shouldn't cause any backward-compatibility DT issue because the current implementation doesn't work and is not even documented. Tested-by: Darren Etheridge Tested-by: Johannes Pointner Signed-off-by: Ezequiel Garcia Signed-off-by: Dave Airlie --- drivers/gpu/drm/tilcdc/tilcdc_panel.c | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-) (limited to 'drivers/gpu/drm/tilcdc') diff --git a/drivers/gpu/drm/tilcdc/tilcdc_panel.c b/drivers/gpu/drm/tilcdc/tilcdc_panel.c index c716c128ded..3dcf08e4dc9 100644 --- a/drivers/gpu/drm/tilcdc/tilcdc_panel.c +++ b/drivers/gpu/drm/tilcdc/tilcdc_panel.c @@ -342,7 +342,7 @@ static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np) static int panel_probe(struct platform_device *pdev) { - struct device_node *node = pdev->dev.of_node; + struct device_node *bl_node, *node = pdev->dev.of_node; struct panel_module *panel_mod; struct tilcdc_module *mod; struct pinctrl *pinctrl; @@ -358,6 +358,17 @@ static int panel_probe(struct platform_device *pdev) if (!panel_mod) return -ENOMEM; + bl_node = of_parse_phandle(node, "backlight", 0); + if (bl_node) { + panel_mod->backlight = of_find_backlight_by_node(bl_node); + of_node_put(bl_node); + + if (!panel_mod->backlight) + return -EPROBE_DEFER; + + dev_info(&pdev->dev, "found backlight\n"); + } + mod = &panel_mod->base; pdev->dev.platform_data = mod; @@ -381,10 +392,6 @@ static int panel_probe(struct platform_device *pdev) mod->preferred_bpp = panel_mod->info->bpp; - panel_mod->backlight = of_find_backlight_by_node(node); - if (panel_mod->backlight) - dev_info(&pdev->dev, "found backlight\n"); - return 0; fail_timings: @@ -392,6 +399,8 @@ fail_timings: fail_free: tilcdc_module_cleanup(mod); + if (panel_mod->backlight) + put_device(&panel_mod->backlight->dev); return ret; } @@ -399,6 +408,10 @@ static int panel_remove(struct platform_device *pdev) { struct tilcdc_module *mod = dev_get_platdata(&pdev->dev); struct panel_module *panel_mod = to_panel_module(mod); + struct backlight_device *backlight = panel_mod->backlight; + + if (backlight) + put_device(&backlight->dev); display_timings_release(panel_mod->timings); -- cgit v1.2.3-70-g09d2