mtd: nand: Fix timing setup for NANDs that do not support SET FEATURES

Some ONFI NANDs do not support the SET/GET FEATURES commands, which,
according to the spec, is perfectly valid.

On these NANDs we can't set a specific timing mode using the "timing
mode" feature, and we should assume the NAND does not require any setup
to enter a specific timing mode.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Fixes: d8e725dd8311 ("mtd: nand: automate NAND timings selection")
Reported-by: Alexander Dahl <ada@thorsis.com>
Cc: <stable@vger.kernel.org>
Tested-by: Alexander Dahl <ada@thorsis.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 5b7c8d0..c6c18b8 100644 (file)
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -1131,7 +1131,9 @@ static int nand_setup_data_interface(struct nand_chip *chip, int chipnr)
         * Ensure the timing mode has been changed on the chip side
         * before changing timings on the controller side.
         */
-       if (chip->onfi_version) {
+       if (chip->onfi_version &&
+           (le16_to_cpu(chip->onfi_params.opt_cmd) &
+            ONFI_OPT_CMD_SET_GET_FEATURES)) {
                u8 tmode_param[ONFI_SUBFEATURE_PARAM_LEN] = {
                        chip->onfi_timing_mode_default,
                };