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002-NAND-Optimize-NAND_ECC_HW_OOB_FIRST-read.patch

002-NAND-Optimize-NAND_ECC_HW_OOB_FIRST-read.patch 1.5 KB
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  1. From 98d33db1c87e2447b9b203399d2f995e05ecdb52 Mon Sep 17 00:00:00 2001
    2. 

  2. From: Lars-Peter Clausen <lars@metafoo.de>
    3. 

  3. Date: Sat, 26 Feb 2011 15:30:07 +0100
    4. 

  4. Subject: [PATCH 2/7] NAND: Optimize NAND_ECC_HW_OOB_FIRST read
    5. 

  5. 

  6. Avoid sending unnecessary READ commands to the chip.
    7. 

  7. ---
    8. 

  8.  drivers/mtd/nand/nand_base.c |   17 +++++++++++++----
    9. 

  9.  1 file changed, 13 insertions(+), 4 deletions(-)
    10. 

  10. 

  11. --- a/drivers/mtd/nand/nand_base.c
    12. 

  12. +++ b/drivers/mtd/nand/nand_base.c
    13. 

  13. @@ -1360,9 +1360,16 @@ static int nand_read_page_hwecc_oob_firs
    14. 

  14.  	unsigned int max_bitflips = 0;
    15. 

  15.  
    16. 

  16.  	/* Read the OOB area first */
    17. 

  17. -	chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page);
    18. 

  18. -	chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
    19. 

  19. -	chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
    20. 

  20. +	/* Read the OOB area first */
    21. 

  21. +	if (mtd->writesize > 512) {
    22. 

  22. +		chip->cmdfunc(mtd, NAND_CMD_READ0, mtd->writesize, page);
    23. 

  23. +		chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
    24. 

  24. +		chip->cmdfunc(mtd, NAND_CMD_RNDOUT, 0, -1);
    25. 

  25. +	} else {
    26. 

  26. +		chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page);
    27. 

  27. +		chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
    28. 

  28. +		chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
    29. 

  29. +	}
    30. 

  30.  
    31. 

  31.  	for (i = 0; i < chip->ecc.total; i++)
    32. 

  32.  		ecc_code[i] = chip->oob_poi[eccpos[i]];
    33. 

  33. @@ -1575,7 +1582,9 @@ static int nand_do_read_ops(struct mtd_i
    34. 

  34.  						 __func__, buf);
    35. 

  35.  
    36. 

  36.  read_retry:
    37. 

  37. -			chip->cmdfunc(mtd, NAND_CMD_READ0, 0x00, page);
    38. 

  38. +			if (chip->ecc.mode != NAND_ECC_HW_OOB_FIRST) {
    39. 

  39. +				chip->cmdfunc(mtd, NAND_CMD_READ0, 0x00, page);
    40. 

  40. +			}
    41. 

  41.  
    42. 

  42.  			/*
    43. 

  43.  			 * Now read the page into the buffer.  Absent an error,
    44.