Unverified Commit d0c99ffe authored by Mark Brown's avatar Mark Brown
Browse files

regmap: Allow reads from write only registers with the flat cache 



The flat cache is intended for devices that need the lowest overhead so
doesn't track any sparseness.

Signed-off-by: default avatarMark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230617-regmap-kunit-read-writeonly-flat-v1-1-efd3ed66dec6@kernel.org


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 3e47b887

drivers/base/regmap/regmap-kunit.c

+12 −3
Original line number Diff line number Diff line
@@ -252,9 +252,18 @@ static void read_writeonly(struct kunit *test) 
	for (i = 0; i < BLOCK_TEST_SIZE; i++)

		data->read[i] = false;



	/* Try to read all the registers, the writeonly one should fail */

	for (i = 0; i < BLOCK_TEST_SIZE; i++)

		KUNIT_EXPECT_EQ(test, i != 5, regmap_read(map, i, &val) == 0);

	/*

	 * Try to read all the registers, the writeonly one should

	 * fail if we aren't using the flat cache.

	 */

	for (i = 0; i < BLOCK_TEST_SIZE; i++) {

		if (t->type != REGCACHE_FLAT) {

			KUNIT_EXPECT_EQ(test, i != 5,

					regmap_read(map, i, &val) == 0);

		} else {

			KUNIT_EXPECT_EQ(test, 0, regmap_read(map, i, &val));

		}

	}



	/* Did we trigger a hardware access? */

	KUNIT_EXPECT_FALSE(test, data->read[5]);