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authorMaxime Ripard <maxime.ripard@free-electrons.com>2018-01-10 18:59:41 +0300
committerMaxime Ripard <maxime.ripard@free-electrons.com>2018-01-15 12:16:56 +0300
commita0d605372a279d71abd29ed985b9a51e66e12170 (patch)
treee3e873ce0c06c5fbab93ae13f6383732280bdf4d /drivers/gpu/drm/panel
parent86a3ae587980f857284a11b86ef345f47298aade (diff)
downloadlinux-a0d605372a279d71abd29ed985b9a51e66e12170.tar.xz
drm/panel: lvds: Handle the optional regulator case properly
The devm_regulator_get_optional function, unlike it was assumed in the commit a1c55bccf600 ("drm/panel: lvds: Add support for the power-supply property"), is actually returning an error pointer with -ENODEV instead of NULL when there's no regulator to find. Make sure we handle that case properly. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Fixes: a1c55bccf600 ("drm/panel: lvds: Add support for the power-supply property") Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180110155941.16109-1-maxime.ripard@free-electrons.com
Diffstat (limited to 'drivers/gpu/drm/panel')
-rw-r--r--drivers/gpu/drm/panel/panel-lvds.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/gpu/drm/panel/panel-lvds.c b/drivers/gpu/drm/panel/panel-lvds.c
index 57e38a9e7ab4..b5e3994f0aa8 100644
--- a/drivers/gpu/drm/panel/panel-lvds.c
+++ b/drivers/gpu/drm/panel/panel-lvds.c
@@ -215,8 +215,15 @@ static int panel_lvds_probe(struct platform_device *pdev)
lvds->supply = devm_regulator_get_optional(lvds->dev, "power");
if (IS_ERR(lvds->supply)) {
ret = PTR_ERR(lvds->supply);
- dev_err(lvds->dev, "failed to request regulator: %d\n", ret);
- return ret;
+
+ if (ret != -ENODEV) {
+ if (ret != -EPROBE_DEFER)
+ dev_err(lvds->dev, "failed to request regulator: %d\n",
+ ret);
+ return ret;
+ }
+
+ lvds->supply = NULL;
}
/* Get GPIOs and backlight controller. */