mtd: rawnand: get rid of the ONFI parameter page in nand_chip

The NAND chip parameter page is statically allocated within the
nand_chip structure, which reserves a lot of space. Even not ONFI nor
JEDEC chips have it embedded. Also, only a few parameters are actually
read from the parameter page after the detection.

Now that there is a small nand_parameters structure that hold all needed
ONFI parameters, remove the ONFI page from the nand_chip structure by
just allocating it during the identification phase and removing it right
after.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>

diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index 7934816..d0b993f 100644 (file)
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -5101,7 +5101,7 @@ ext_out:
 static int nand_flash_detect_onfi(struct nand_chip *chip)
 {
        struct mtd_info *mtd = nand_to_mtd(chip);
-       struct nand_onfi_params *p = &chip->onfi_params;
+       struct nand_onfi_params *p;
        char id[4];
        int i, ret, val;
 
@@ -5110,14 +5110,23 @@ static int nand_flash_detect_onfi(struct nand_chip *chip)
        if (ret || strncmp(id, "ONFI", 4))
                return 0;
 
+       /* ONFI chip: allocate a buffer to hold its parameter page */
+       p = kzalloc(sizeof(*p), GFP_KERNEL);
+       if (!p)
+               return -ENOMEM;
+
        ret = nand_read_param_page_op(chip, 0, NULL, 0);
-       if (ret)
-               return 0;
+       if (ret) {
+               ret = 0;
+               goto free_onfi_param_page;
+       }
 
        for (i = 0; i < 3; i++) {
                ret = nand_read_data_op(chip, p, sizeof(*p), true);
-               if (ret)
-                       return 0;
+               if (ret) {
+                       ret = 0;
+                       goto free_onfi_param_page;
+               }
 
                if (onfi_crc16(ONFI_CRC_BASE, (uint8_t *)p, 254) ==
                                le16_to_cpu(p->crc)) {
@@ -5127,7 +5136,7 @@ static int nand_flash_detect_onfi(struct nand_chip *chip)
 
        if (i == 3) {
                pr_err("Could not find valid ONFI parameter page; aborting\n");
-               return 0;
+               goto free_onfi_param_page;
        }
 
        /* Check version */
@@ -5145,7 +5154,9 @@ static int nand_flash_detect_onfi(struct nand_chip *chip)
 
        if (!chip->parameters.onfi.version) {
                pr_info("unsupported ONFI version: %d\n", val);
-               return 0;
+               goto free_onfi_param_page;
+       } else {
+               ret = 1;
        }
 
        sanitize_string(p->manufacturer, sizeof(p->manufacturer));
@@ -5217,7 +5228,9 @@ static int nand_flash_detect_onfi(struct nand_chip *chip)
        memcpy(chip->parameters.onfi.vendor, p->vendor,
               sizeof(p->vendor));
 
-       return 1;
+free_onfi_param_page:
+       kfree(p);
+       return ret;
 }
 
 /*
@@ -5612,7 +5625,10 @@ static int nand_detect(struct nand_chip *chip, struct nand_flash_dev *type)
        chip->parameters.onfi.version = 0;
        if (!type->name || !type->pagesize) {
                /* Check if the chip is ONFI compliant */
-               if (nand_flash_detect_onfi(chip))
+               ret = nand_flash_detect_onfi(chip);
+               if (ret < 0)
+                       return ret;
+               else if (ret)
                        goto ident_done;
 
                /* Check if the chip is JEDEC compliant */

diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
index cf82a95..5dad59b 100644 (file)
--- a/include/linux/mtd/rawnand.h
+++ b/include/linux/mtd/rawnand.h
@@ -1200,8 +1200,6 @@ int nand_op_parser_exec_op(struct nand_chip *chip,
  *                     currently in data_buf.
  * @subpagesize:       [INTERN] holds the subpagesize
  * @id:                        [INTERN] holds NAND ID
- * @onfi_params:       [INTERN] holds the ONFI page parameter when ONFI is
- *                     supported, 0 otherwise.
  * @parameters:                [INTERN] holds generic parameters under an easily
  *                     readable form.
  * @max_bb_per_die:    [INTERN] the max number of bad blocks each die of a
@@ -1282,7 +1280,6 @@ struct nand_chip {
        int badblockbits;
 
        struct nand_id id;
-       struct nand_onfi_params onfi_params;
        struct nand_parameters parameters;
        u16 max_bb_per_die;
        u32 blocks_per_die;