tests: drivers: can: api: relax CAN sample point accuracy requirements

Relax the CAN sample point location accuracy requirements in the CAN API
test suites by taking CONFIG_CAN_SAMPLE_POINT_MARGIN into account.

Fixes: #100615

Signed-off-by: Henrik Brix Andersen <[email protected]>

Author: henrikbrixandersen

tests/drivers/can/api/src/canfd.c

@@ -528,7 +528,8 @@ ZTEST_USER(canfd, test_set_timing_data_while_started)
 	int err;
 
 	err = can_calc_timing_data(can_dev, &timing, TEST_BITRATE_3, TEST_SAMPLE_POINT);
-	zassert_ok(err, "failed to calculate data timing (err %d)", err);
+	zassert_true(err >= 0, "failed to calculate data timing (err %d)", err);
+	zassert_true(err <= CONFIG_CAN_SAMPLE_POINT_MARGIN, "sample point error %d too large", err);
 
 	err = can_set_timing_data(can_dev, &timing);
 	zassert_not_equal(err, 0, "changed data timing while started");

tests/drivers/can/api/src/classic.c

@@ -1393,7 +1393,8 @@ ZTEST_USER(can_classic, test_set_timing_while_started)
 	int err;
 
 	err = can_calc_timing(can_dev, &timing, TEST_BITRATE_1, TEST_SAMPLE_POINT);
-	zassert_ok(err, "failed to calculate timing (err %d)", err);
+	zassert_true(err >= 0, "failed to calculate timing (err %d)", err);
+	zassert_true(err <= CONFIG_CAN_SAMPLE_POINT_MARGIN, "sample point error %d too large", err);
 
 	err = can_set_timing(can_dev, &timing);
 	zassert_not_equal(err, 0, "changed timing while started");