[RFC Patch 3/3] mtd: nand: Add custom timings for Hynix H27UBG8T2BTR-BC

[Roy Spliet]

This particular chip has a tADL so high that only ONFI mode 0 matches all
timings. Using this custom timing definition, we can ramp the clock up to
50MHz, having a significant positive effect on performance (e.g. boot time
reduction of 30%).
---
 drivers/mtd/nand/nand_ids.c | 47 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/drivers/mtd/nand/nand_ids.c b/drivers/mtd/nand/nand_ids.c
index dd620c1..15b4a03 100644
--- a/drivers/mtd/nand/nand_ids.c
+++ b/drivers/mtd/nand/nand_ids.c
@@ -19,6 +19,49 @@
 #define SP_OPTIONS16 (SP_OPTIONS | NAND_BUSWIDTH_16)
 
 /*
+ * Hynix H27UBG8T2BTR timings
+ * This chip has an exceptionally large tADL, which results in only supporting
+ * ONFI timing mode 0. Using these timings, the clock can be raised from
+ * 12.5MHz to 50MHz.
+ */
+const struct nand_sdr_timings hynix_h27ubg8t2btr_sdr_timing = {
+	.tADL_min = 200000,
+	.tALH_min = 5000,
+	.tALS_min = 10000,
+	.tAR_min = 10000,
+	.tCEA_max = 100000,
+	.tCEH_min = 20000,
+	.tCH_min = 5000,
+	.tCHZ_max = 50000,
+	.tCLH_min = 5000,
+	.tCLR_min = 10000,
+	.tCLS_min = 10000,
+	.tCOH_min = 15000,
+	.tCS_min = 20000,
+	.tDH_min = 5000,
+	.tDS_min = 10000,
+	.tFEAT_max = 1000000,
+	.tIR_min = 0,
+	.tITC_max = 1000000,
+	.tRC_min = 20000,
+	.tREA_max = 16000,
+	.tREH_min = 8000,
+	.tRHOH_min = 15000,
+	.tRHW_min = 100000,
+	.tRHZ_max = 100000,
+	.tRLOH_min = 5000,
+	.tRP_min = 10000,
+	.tRST_max = 500000000,
+	.tWB_max = 100000,
+	.tRR_min = 20000,
+	.tWC_min = 20000,
+	.tWH_min = 10000,
+	.tWHR_min = 80000,
+	.tWP_min = 8000,
+	.tWW_min = 100000,
+};
+
+/*
  * The chip ID list:
  *    name, device ID, page size, chip size in MiB, eraseblock size, options
  *
@@ -50,6 +93,10 @@ struct nand_flash_dev nand_flash_ids[] = {
 		{ .id = {0xad, 0xde, 0x94, 0xda, 0x74, 0xc4} },
 		  SZ_8K, SZ_8K, SZ_2M, 0, 6, 640, NAND_ECC_INFO(40, SZ_1K),
 		  4 },
+	{"H27UBG8T2BTR-BC 64G 3.3V 8-bit",
+		{ .id = {0xad, 0xd7, 0x94, 0xda, 0x74, 0xc3} },
+		  SZ_8K, SZ_4K, SZ_2M, 0, 6, 640, NAND_ECC_INFO(40, SZ_1K),
+		  0, &hynix_h27ubg8t2btr_sdr_timing },
 
 	LEGACY_ID_NAND("NAND 4MiB 5V 8-bit",   0x6B, 4, SZ_8K, SP_OPTIONS),
 	LEGACY_ID_NAND("NAND 4MiB 3,3V 8-bit", 0xE3, 4, SZ_8K, SP_OPTIONS),
-- 
2.4.3


-- 


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