[PATCH libdrm 07/10] modetest: add an add_property_optional variant that does not print errors

[Ilia Mirkin]

As new features are added and others are declared to be legacy, it's
nice to be able to implement fallbacks. As such, create a
property-setting variant that does not generate errors which can very
well be entirely expected.

Will be used for gamma control in a future change.

Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
---
 tests/modetest/modetest.c | 29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/tests/modetest/modetest.c b/tests/modetest/modetest.c
index a1c81f6c..71ddc861 100644
--- a/tests/modetest/modetest.c
+++ b/tests/modetest/modetest.c
@@ -948,9 +948,10 @@ struct property_arg {
 	char name[DRM_PROP_NAME_LEN+1];
 	uint32_t prop_id;
 	uint64_t value;
+	bool optional;
 };
 
-static void set_property(struct device *dev, struct property_arg *p)
+static bool set_property(struct device *dev, struct property_arg *p)
 {
 	drmModeObjectProperties *props = NULL;
 	drmModePropertyRes **props_info = NULL;
@@ -982,13 +983,13 @@ static void set_property(struct device *dev, struct property_arg *p)
 	if (p->obj_type == 0) {
 		fprintf(stderr, "Object %i not found, can't set property\n",
 			p->obj_id);
-			return;
+		return false;
 	}
 
 	if (!props) {
 		fprintf(stderr, "%s %i has no properties\n",
 			obj_type, p->obj_id);
-		return;
+		return false;
 	}
 
 	for (i = 0; i < (int)props->count_props; ++i) {
@@ -999,9 +1000,10 @@ static void set_property(struct device *dev, struct property_arg *p)
 	}
 
 	if (i == (int)props->count_props) {
-		fprintf(stderr, "%s %i has no %s property\n",
-			obj_type, p->obj_id, p->name);
-		return;
+		if (!p->optional)
+			fprintf(stderr, "%s %i has no %s property\n",
+				obj_type, p->obj_id, p->name);
+		return false;
 	}
 
 	p->prop_id = props->props[i];
@@ -1015,6 +1017,8 @@ static void set_property(struct device *dev, struct property_arg *p)
 	if (ret < 0)
 		fprintf(stderr, "failed to set %s %i property %s to %" PRIu64 ": %s\n",
 			obj_type, p->obj_id, p->name, p->value, strerror(errno));
+
+	return true;
 }
 
 /* -------------------------------------------------------------------------- */
@@ -1072,6 +1076,19 @@ static void add_property(struct device *dev, uint32_t obj_id,
 	set_property(dev, &p);
 }
 
+static bool add_property_optional(struct device *dev, uint32_t obj_id,
+				  const char *name, uint64_t value)
+{
+	struct property_arg p;
+
+	p.obj_id = obj_id;
+	strcpy(p.name, name);
+	p.value = value;
+	p.optional = true;
+
+	return set_property(dev, &p);
+}
+
 static int atomic_set_plane(struct device *dev, struct plane_arg *p,
 							int pattern, bool update)
 {
-- 
2.21.0