openwrtv4/target/linux/sunxi/patches-4.1/128-2-mtd-nand-support-non-ONFI-timings.patch

--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -4262,8 +4262,13 @@ static bool find_full_id_nand(struct mtd
 		chip->ecc_strength_ds = NAND_ECC_STRENGTH(type);
 		chip->ecc_step_ds = NAND_ECC_STEP(type);
 
-		mode = type->onfi_timing_mode_default;
-		chip->sdr_timings = onfi_async_timing_mode_to_sdr_timings(mode);
+		if (type->custom_sdr_timing) {
+			chip->sdr_timings = type->custom_sdr_timing;
+		} else {
+			mode = type->onfi_timing_mode_default;
+			chip->sdr_timings =
+				onfi_async_timing_mode_to_sdr_timings(mode);
+		}
 
 		*busw = type->options & NAND_BUSWIDTH_16;
 
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -988,6 +988,7 @@ struct nand_flash_dev {
 		uint16_t step_ds;
 	} ecc;
 	int onfi_timing_mode_default;
+	const struct nand_sdr_timings *custom_sdr_timing;
 };
 
 /**