mtd: rawnand: Get rid of the default ONFI timing mode

The ->choose_interface() hook is here for manufacturer drivers to
provide a better timing interface than the default one, this field is
not needed anymore.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/linux-mtd/20200529111322.7184-28-miquel.raynal@bootlin.com

drivers/mtd/nand/raw/nand_base.c

@@ -1012,10 +1012,8 @@ static int nand_setup_interface(struct nand_chip *chip, int chipnr)
  * @iface: the interface configuration (can eventually be updated)
  * @spec_timings: specific timings, when not fitting the ONFI specification
  *
- * If specific timings are provided, use them. Otherwise, try to retrieve
- * supported timing modes from ONFI information. Finally, if the NAND chip does
- * not follow the ONFI specification, rely on the ->default_timing_mode
- * specified in the nand_ids table.
+ * If specific timings are provided, use them. Otherwise, retrieve supported
+ * timing modes from ONFI information.
  */
 int nand_choose_best_sdr_timings(struct nand_chip *chip,
 				 struct nand_interface_config *iface,
@@ -1038,15 +1036,8 @@ int nand_choose_best_sdr_timings(struct nand_chip *chip,
 
 		/* Fallback to slower modes */
 		best_mode = iface->timings.mode;
-	} else {
-		if (chip->parameters.onfi) {
-			unsigned int onfi_modes;
-
-			onfi_modes = chip->parameters.onfi->async_timing_mode;
-			best_mode = fls(onfi_modes) - 1;
-		} else {
-			best_mode = chip->onfi_timing_mode_default;
-		}
+	} else if (chip->parameters.onfi) {
+		best_mode = fls(chip->parameters.onfi->async_timing_mode) - 1;
 	}
 
 	for (mode = best_mode; mode >= 0; mode--) {
@@ -4767,8 +4758,6 @@ static bool find_full_id_nand(struct nand_chip *chip,
 		chip->options |= type->options;
 		chip->base.eccreq.strength = NAND_ECC_STRENGTH(type);
 		chip->base.eccreq.step_size = NAND_ECC_STEP(type);
-		chip->onfi_timing_mode_default =
-					type->onfi_timing_mode_default;
 
 		chip->parameters.model = kstrdup(type->name, GFP_KERNEL);
 		if (!chip->parameters.model)

include/linux/mtd/rawnand.h

@@ -1069,9 +1069,6 @@ struct nand_manufacturer {
  * @options: Various chip options. They can partly be set to inform nand_scan
  *           about special functionality. See the defines for further
  *           explanation.
- * @onfi_timing_mode_default: Default ONFI timing mode. This field is set to the
- *			      actually used ONFI mode if the chip is ONFI
- *			      compliant or deduced from the datasheet otherwise
  * @interface_config: NAND interface timing information
  * @bbt_erase_shift: Number of address bits in a bbt entry
  * @bbt_options: Bad block table specific options. All options used here must
@@ -1119,7 +1116,6 @@ struct nand_chip {
 	unsigned int options;
 
 	/* Data interface */
-	int onfi_timing_mode_default;
 	struct nand_interface_config interface_config;
 
 	/* Bad block information */
@@ -1268,10 +1264,6 @@ nand_get_interface_config(struct nand_chip *chip)
  *               @ecc_step_ds in nand_chip{}, also from the datasheet.
  *               For example, the "4bit ECC for each 512Byte" can be set with
  *               NAND_ECC_INFO(4, 512).
- * @onfi_timing_mode_default: the default ONFI timing mode entered after a NAND
- *			      reset. Should be deduced from timings described
- *			      in the datasheet.
- *
  */
 struct nand_flash_dev {
 	char *name;
@@ -1292,7 +1284,6 @@ struct nand_flash_dev {
 		uint16_t strength_ds;
 		uint16_t step_ds;
 	} ecc;
-	int onfi_timing_mode_default;
 };
 
 int nand_create_bbt(struct nand_chip *chip);