drm/panel-simple: Support DP AUX backlight

If there is no backlight specified in the device tree and the panel
has access to the DP AUX channel then create a DP AUX backlight if
supported by the panel.

Signed-off-by: Rajeev Nandan <rajeevny@codeaurora.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1624726268-14869-3-git-send-email-rajeevny@codeaurora.org

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 78f0394..6f233f2 100644 (file)
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -800,6 +800,12 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc,
        if (err)
                goto disable_pm_runtime;
 
+       if (!panel->base.backlight && panel->aux) {
+               err = drm_panel_dp_aux_backlight(&panel->base, panel->aux);
+               if (err)
+                       goto disable_pm_runtime;
+       }
+
        drm_panel_add(&panel->base);
 
        return 0;