mtd: nand: support Micron READ RETRY

Micron provides READ RETRY support via the ONFI vendor-specific
parameter block (to indicate how many read-retry modes are available)
and the ONFI {GET,SET}_FEATURES commands with a vendor-specific feature
address (to support reading/switching the current read-retry mode).

The recommended sequence is as follows:

  1. Perform PAGE_READ operation
  2. If no ECC error, we are done
  3. Run SET_FEATURES with feature address 89h, mode 1
  4. Retry PAGE_READ operation
  5. If ECC error and there are remaining supported modes, increment the
     mode and return to step 3. Otherwise, this is a true ECC error.
  6. Run SET_FEATURES with feature address 89h, mode 0, to return to the
     default state.

This patch implements the chip->setup_read_retry() callback for
Micron and fills in the chip->read_retries.

Tested on Micron MT29F32G08CBADA, which supports 8 read-retry modes.

The Micron vendor-specific table was checked against the datasheets for
the following Micron NAND:

Needs retry   Cell-type    Part number          Vendor revision    Byte 180
-----------   ---------    ----------------     ---------------    ------------
No            SLC          MT29F16G08ABABA      1                  Reserved (0)
No            MLC          MT29F32G08CBABA      1                  Reserved (0)
No            SLC          MT29F1G08AACWP       1                  0
Yes           MLC          MT29F32G08CBADA      1                  08h
Yes           MLC          MT29F64G08CBABA      2                  08h

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Huang Shijie <b32955@freescale.com>

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 4c2f39f351da2e53bb817f130009b39bf9adb6c2..b8c74cda76255fbc3876ea93208aa839dd7fb765 100644 (file)
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -2979,6 +2979,30 @@ ext_out:
        return ret;
 }
 
+static int nand_setup_read_retry_micron(struct mtd_info *mtd, int retry_mode)
+{
+       struct nand_chip *chip = mtd->priv;
+       uint8_t feature[ONFI_SUBFEATURE_PARAM_LEN] = {retry_mode};
+
+       return chip->onfi_set_features(mtd, chip, ONFI_FEATURE_ADDR_READ_RETRY,
+                       feature);
+}
+
+/*
+ * Configure chip properties from Micron vendor-specific ONFI table
+ */
+static void nand_onfi_detect_micron(struct nand_chip *chip,
+               struct nand_onfi_params *p)
+{
+       struct nand_onfi_vendor_micron *micron = (void *)p->vendor;
+
+       if (le16_to_cpu(p->vendor_revision) < 1)
+               return;
+
+       chip->read_retries = micron->read_retry_options;
+       chip->setup_read_retry = nand_setup_read_retry_micron;
+}
+
 /*
  * Check if the NAND chip is ONFI compliant, returns 1 if it is, 0 otherwise.
  */
@@ -3085,6 +3109,9 @@ static int nand_flash_detect_onfi(struct mtd_info *mtd, struct nand_chip *chip,
                pr_warn("Could not retrieve ONFI ECC requirements\n");
        }
 
+       if (p->jedec_id == NAND_MFR_MICRON)
+               nand_onfi_detect_micron(chip, p);
+
        return 1;
 }
 

diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 267d61dd89ddc0b638e2dfafbfdcd4867c4e62de..3080a8c8b62ea4d29e499d441d004594f61de47e 100644 (file)
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -219,6 +219,9 @@ struct nand_chip;
 /* ONFI feature address */
 #define ONFI_FEATURE_ADDR_TIMING_MODE  0x1
 
+/* Vendor-specific feature address (Micron) */
+#define ONFI_FEATURE_ADDR_READ_RETRY   0x89
+
 /* ONFI subfeature parameters length */
 #define ONFI_SUBFEATURE_PARAM_LEN      4