mtd: mtd_nandecctest: add no corruption test

This adds no corruptin test case listed below:

Prepare data block and ECC data with no corruption, and verify that
the data block is preserved by __nand_correct_data()

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/mtd/tests/mtd_nandecctest.c b/drivers/mtd/tests/mtd_nandecctest.c
index 204f796ed3e7..ff97b1070235 100644
--- a/drivers/mtd/tests/mtd_nandecctest.c
+++ b/drivers/mtd/tests/mtd_nandecctest.c
@@ -48,6 +48,27 @@ static void single_bit_error_data(void *error_data, void *correct_data,
         __change_bit_le(offset, error_data);
 }
 
+static void no_bit_error(void *error_data, void *error_ecc,
+                void *correct_data, void *correct_ecc, const size_t size)
+{
+        memcpy(error_data, correct_data, size);
+        memcpy(error_ecc, correct_ecc, 3);
+}
+
+static int no_bit_error_verify(void *error_data, void *error_ecc,
+                                void *correct_data, const size_t size)
+{
+        unsigned char calc_ecc[3];
+        int ret;
+
+        __nand_calculate_ecc(error_data, size, calc_ecc);
+        ret = __nand_correct_data(error_data, error_ecc, calc_ecc, size);
+        if (ret == 0 && !memcmp(correct_data, error_data, size))
+                return 0;
+
+        return -EINVAL;
+}
+
 static void single_bit_error_in_data(void *error_data, void *error_ecc,
                 void *correct_data, void *correct_ecc, const size_t size)
 {
@@ -71,6 +92,11 @@ static int single_bit_error_correct(void *error_data, void *error_ecc,
 
 static const struct nand_ecc_test nand_ecc_test[] = {
         {
+                .name = "no-bit-error",
+                .prepare = no_bit_error,
+                .verify = no_bit_error_verify,
+        },
+        {
                 .name = "single-bit-error-in-data-correct",
                 .prepare = single_bit_error_in_data,
                 .verify = single_bit_error_correct,