[PATCH v2 07/12] drm/panel: simple: don't fail if we don't have panel desc

[Vasily Khoruzhick <anarsoul-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

This is preparation for addition of generic eDP panel that
doesn't have any modes or delays defined.

Signed-off-by: Vasily Khoruzhick <anarsoul-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/gpu/drm/panel/panel-simple.c | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 9c69e739a524..2f2cb2d81f2b 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -176,7 +176,7 @@ static int panel_simple_disable(struct drm_panel *panel)
 		backlight_update_status(p->backlight);
 	}
 
-	if (p->desc->delay.disable)
+	if (p->desc && p->desc->delay.disable)
 		msleep(p->desc->delay.disable);
 
 	p->enabled = false;
@@ -195,7 +195,7 @@ static int panel_simple_unprepare(struct drm_panel *panel)
 
 	regulator_disable(p->supply);
 
-	if (p->desc->delay.unprepare)
+	if (p->desc && p->desc->delay.unprepare)
 		msleep(p->desc->delay.unprepare);
 
 	p->prepared = false;
@@ -220,11 +220,13 @@ static int panel_simple_prepare(struct drm_panel *panel)
 
 	gpiod_set_value_cansleep(p->enable_gpio, 1);
 
-	delay = p->desc->delay.prepare;
-	if (p->no_hpd)
-		delay += p->desc->delay.hpd_absent_delay;
-	if (delay)
-		msleep(delay);
+	if (p->desc) {
+		delay = p->desc->delay.prepare;
+		if (p->no_hpd)
+			delay += p->desc->delay.hpd_absent_delay;
+		if (delay)
+			msleep(delay);
+	}
 
 	p->prepared = true;
 
@@ -238,7 +240,7 @@ static int panel_simple_enable(struct drm_panel *panel)
 	if (p->enabled)
 		return 0;
 
-	if (p->desc->delay.enable)
+	if (p->desc && p->desc->delay.enable)
 		msleep(p->desc->delay.enable);
 
 	if (p->backlight) {
@@ -280,6 +282,9 @@ static int panel_simple_get_timings(struct drm_panel *panel,
 	struct panel_simple *p = to_panel_simple(panel);
 	unsigned int i;
 
+	if (!p->desc)
+		return 0;
+
 	if (p->desc->num_timings < num_timings)
 		num_timings = p->desc->num_timings;
 
-- 
2.20.1