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 <[e-mail]>
Fixes: d8e725dd8311 ("mtd: nand: automate NAND timings selection")
Reported-by: Alexander Dahl <[e-mail]>
Cc: <[e-mail]>
Tested-by: Alexander Dahl <[e-mail]>
Signed-off-by: Boris Brezillon <[e-mail]>

drivers/mtd/nand/nand_base.c

···
 	 * 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,
 		};