target/linux/generic-2.6/patches/009-revert_intel_flash_breakage.patch

   1 diff -urN linux-2.6.21.1.old/drivers/mtd/chips/cfi_cmdset_0001.c linux-2.6.21.1.dev/drivers/mtd/chips/cfi_cmdset_0001.c
   2 --- linux-2.6.21.1.old/drivers/mtd/chips/cfi_cmdset_0001.c      2007-04-27 23:49:26.000000000 +0200
   3 +++ linux-2.6.21.1.dev/drivers/mtd/chips/cfi_cmdset_0001.c      2007-05-26 19:40:46.809023552 +0200
   4 @@ -919,7 +919,7 @@
   5
   6  static int __xipram xip_wait_for_operation(
   7                 struct map_info *map, struct flchip *chip,
   8 -               unsigned long adr, unsigned int chip_op_time )
   9 +               unsigned long adr, int *chip_op_time )
  10  {
  11         struct cfi_private *cfi = map->fldrv_priv;
  12         struct cfi_pri_intelext *cfip = cfi->cmdset_priv;
  13 @@ -928,7 +928,7 @@
  14         flstate_t oldstate, newstate;
  15
  16                 start = xip_currtime();
  17 -       usec = chip_op_time * 8;
  18 +       usec = *chip_op_time * 8;
  19         if (usec == 0)
  20                 usec = 500000;
  21         done = 0;
  22 @@ -1038,8 +1038,8 @@
  23  #define XIP_INVAL_CACHED_RANGE(map, from, size)  \
  24         INVALIDATE_CACHED_RANGE(map, from, size)
  25
  26 -#define INVAL_CACHE_AND_WAIT(map, chip, cmd_adr, inval_adr, inval_len, usec) \
  27 -       xip_wait_for_operation(map, chip, cmd_adr, usec)
  28 +#define INVAL_CACHE_AND_WAIT(map, chip, cmd_adr, inval_adr, inval_len, p_usec) \
  29 +       xip_wait_for_operation(map, chip, cmd_adr, p_usec)
  30
  31  #else
  32
  33 @@ -1051,65 +1051,65 @@
  34  static int inval_cache_and_wait_for_operation(
  35                 struct map_info *map, struct flchip *chip,
  36                 unsigned long cmd_adr, unsigned long inval_adr, int inval_len,
  37 -               unsigned int chip_op_time)
  38 +               int *chip_op_time )
  39  {
  40         struct cfi_private *cfi = map->fldrv_priv;
  41         map_word status, status_OK = CMD(0x80);
  42 -       int chip_state = chip->state;
  43 -       unsigned int timeo, sleep_time;
  44 +       int z, chip_state = chip->state;
  45 +       unsigned long timeo;
  46
  47         spin_unlock(chip->mutex);
  48         if (inval_len)
  49                 INVALIDATE_CACHED_RANGE(map, inval_adr, inval_len);
  50 +       if (*chip_op_time)
  51 +               cfi_udelay(*chip_op_time);
  52         spin_lock(chip->mutex);
  53
  54 -       /* set our timeout to 8 times the expected delay */
  55 -       timeo = chip_op_time * 8;
  56 -       if (!timeo)
  57 -               timeo = 500000;
  58 -       sleep_time = chip_op_time / 2;
  59 +       timeo = *chip_op_time * 8 * HZ / 1000000;
  60 +       if (timeo < HZ/2)
  61 +               timeo = HZ/2;
  62 +       timeo += jiffies;
  63
  64 +       z = 0;
  65         for (;;) {
  66 +               if (chip->state != chip_state) {
  67 +                       /* Someone's suspended the operation: sleep */
  68 +                       DECLARE_WAITQUEUE(wait, current);
  69 +
  70 +                       set_current_state(TASK_UNINTERRUPTIBLE);
  71 +                       add_wait_queue(&chip->wq, &wait);
  72 +                       spin_unlock(chip->mutex);
  73 +                       schedule();
  74 +                       remove_wait_queue(&chip->wq, &wait);
  75 +                       timeo = jiffies + (HZ / 2); /* FIXME */
  76 +                       spin_lock(chip->mutex);
  77 +                       continue;
  78 +               }
  79 +
  80                 status = map_read(map, cmd_adr);
  81                 if (map_word_andequal(map, status, status_OK, status_OK))
  82                         break;
  83
  84 -               if (!timeo) {
  85 +               /* OK Still waiting */
  86 +               if (time_after(jiffies, timeo)) {
  87                         map_write(map, CMD(0x70), cmd_adr);
  88                         chip->state = FL_STATUS;
  89                         return -ETIME;
  90                 }
  91
  92 -               /* OK Still waiting. Drop the lock, wait a while and retry. */
  93 +               /* Latency issues. Drop the lock, wait a while and retry */
  94 +               z++;
  95                 spin_unlock(chip->mutex);
  96 -               if (sleep_time >= 1000000/HZ) {
  97 -                       /*
  98 -                        * Half of the normal delay still remaining
  99 -                        * can be performed with a sleeping delay instead
 100 -                        * of busy waiting.
 101 -                        */
 102 -                       msleep(sleep_time/1000);
 103 -                       timeo -= sleep_time;
 104 -                       sleep_time = 1000000/HZ;
 105 -               } else {
 106 -                       udelay(1);
 107 -                       cond_resched();
 108 -                       timeo--;
 109 -               }
 110 +               cfi_udelay(1);
 111                 spin_lock(chip->mutex);
 112 -
 113 -               while (chip->state != chip_state) {
 114 -                       /* Someone's suspended the operation: sleep */
 115 -                       DECLARE_WAITQUEUE(wait, current);
 116 -                       set_current_state(TASK_UNINTERRUPTIBLE);
 117 -                       add_wait_queue(&chip->wq, &wait);
 118 -                       spin_unlock(chip->mutex);
 119 -                       schedule();
 120 -                       remove_wait_queue(&chip->wq, &wait);
 121 -                       spin_lock(chip->mutex);
 122 -               }
 123         }
 124
 125 +       if (!z) {
 126 +               if (!--(*chip_op_time))
 127 +                       *chip_op_time = 1;
 128 +       } else if (z > 1)
 129 +               ++(*chip_op_time);
 130 +
 131         /* Done and happy. */
 132         chip->state = FL_STATUS;
 133         return 0;
 134 @@ -1118,7 +1118,8 @@
 135  #endif
 136
 137  #define WAIT_TIMEOUT(map, chip, adr, udelay) \
 138 -       INVAL_CACHE_AND_WAIT(map, chip, adr, 0, 0, udelay);
 139 +       ({ int __udelay = (udelay); \
 140 +          INVAL_CACHE_AND_WAIT(map, chip, adr, 0, 0, &__udelay); })
 141
 142
 143  static int do_point_onechip (struct map_info *map, struct flchip *chip, loff_t adr, size_t len)
 144 @@ -1342,7 +1343,7 @@
 145
 146         ret = INVAL_CACHE_AND_WAIT(map, chip, adr,
 147                                    adr, map_bankwidth(map),
 148 -                                  chip->word_write_time);
 149 +                                  &chip->word_write_time);
 150         if (ret) {
 151                 xip_enable(map, chip, adr);
 152                 printk(KERN_ERR "%s: word write error (status timeout)\n", map->name);
 153 @@ -1579,7 +1580,7 @@
 154
 155         ret = INVAL_CACHE_AND_WAIT(map, chip, cmd_adr,
 156                                    adr, len,
 157 -                                  chip->buffer_write_time);
 158 +                                  &chip->buffer_write_time);
 159         if (ret) {
 160                 map_write(map, CMD(0x70), cmd_adr);
 161                 chip->state = FL_STATUS;
 162 @@ -1714,7 +1715,7 @@
 163
 164         ret = INVAL_CACHE_AND_WAIT(map, chip, adr,
 165                                    adr, len,
 166 -                                  chip->erase_time);
 167 +                                  &chip->erase_time);
 168         if (ret) {
 169                 map_write(map, CMD(0x70), adr);
 170                 chip->state = FL_STATUS;