diff options
Diffstat (limited to 'target/linux/generic-2.6/patches/009-revert_intel_flash_breakage.patch')
| -rw-r--r-- | target/linux/generic-2.6/patches/009-revert_intel_flash_breakage.patch | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/target/linux/generic-2.6/patches/009-revert_intel_flash_breakage.patch b/target/linux/generic-2.6/patches/009-revert_intel_flash_breakage.patch new file mode 100644 index 0000000000..ea06360c48 --- /dev/null +++ b/target/linux/generic-2.6/patches/009-revert_intel_flash_breakage.patch @@ -0,0 +1,169 @@ +--- linux.old/drivers/mtd/chips/cfi_cmdset_0001.c 2007-02-13 02:41:50.816650352 +0100 ++++ linux.dev/drivers/mtd/chips/cfi_cmdset_0001.c 2007-02-13 02:42:13.782159064 +0100 +@@ -908,7 +908,7 @@ + + static int __xipram xip_wait_for_operation( + struct map_info *map, struct flchip *chip, +- unsigned long adr, unsigned int chip_op_time ) ++ unsigned long adr, int *chip_op_time ) + { + struct cfi_private *cfi = map->fldrv_priv; + struct cfi_pri_intelext *cfip = cfi->cmdset_priv; +@@ -917,7 +917,7 @@ + flstate_t oldstate, newstate; + + start = xip_currtime(); +- usec = chip_op_time * 8; ++ usec = *chip_op_time * 8; + if (usec == 0) + usec = 500000; + done = 0; +@@ -1027,8 +1027,8 @@ + #define XIP_INVAL_CACHED_RANGE(map, from, size) \ + INVALIDATE_CACHED_RANGE(map, from, size) + +-#define INVAL_CACHE_AND_WAIT(map, chip, cmd_adr, inval_adr, inval_len, usec) \ +- xip_wait_for_operation(map, chip, cmd_adr, usec) ++#define INVAL_CACHE_AND_WAIT(map, chip, cmd_adr, inval_adr, inval_len, p_usec) \ ++ xip_wait_for_operation(map, chip, cmd_adr, p_usec) + + #else + +@@ -1040,65 +1040,65 @@ + static int inval_cache_and_wait_for_operation( + struct map_info *map, struct flchip *chip, + unsigned long cmd_adr, unsigned long inval_adr, int inval_len, +- unsigned int chip_op_time) ++ int *chip_op_time ) + { + struct cfi_private *cfi = map->fldrv_priv; + map_word status, status_OK = CMD(0x80); +- int chip_state = chip->state; +- unsigned int timeo, sleep_time; ++ int z, chip_state = chip->state; ++ unsigned long timeo; + + spin_unlock(chip->mutex); + if (inval_len) + INVALIDATE_CACHED_RANGE(map, inval_adr, inval_len); ++ if (*chip_op_time) ++ cfi_udelay(*chip_op_time); + spin_lock(chip->mutex); + +- /* set our timeout to 8 times the expected delay */ +- timeo = chip_op_time * 8; +- if (!timeo) +- timeo = 500000; +- sleep_time = chip_op_time / 2; ++ timeo = *chip_op_time * 8 * HZ / 1000000; ++ if (timeo < HZ/2) ++ timeo = HZ/2; ++ timeo += jiffies; + ++ z = 0; + for (;;) { ++ if (chip->state != chip_state) { ++ /* Someone's suspended the operation: sleep */ ++ DECLARE_WAITQUEUE(wait, current); ++ ++ set_current_state(TASK_UNINTERRUPTIBLE); ++ add_wait_queue(&chip->wq, &wait); ++ spin_unlock(chip->mutex); ++ schedule(); ++ remove_wait_queue(&chip->wq, &wait); ++ timeo = jiffies + (HZ / 2); /* FIXME */ ++ spin_lock(chip->mutex); ++ continue; ++ } ++ + status = map_read(map, cmd_adr); + if (map_word_andequal(map, status, status_OK, status_OK)) + break; + +- if (!timeo) { ++ /* OK Still waiting */ ++ if (time_after(jiffies, timeo)) { + map_write(map, CMD(0x70), cmd_adr); + chip->state = FL_STATUS; + return -ETIME; + } + +- /* OK Still waiting. Drop the lock, wait a while and retry. */ ++ /* Latency issues. Drop the lock, wait a while and retry */ ++ z++; + spin_unlock(chip->mutex); +- if (sleep_time >= 1000000/HZ) { +- /* +- * Half of the normal delay still remaining +- * can be performed with a sleeping delay instead +- * of busy waiting. +- */ +- msleep(sleep_time/1000); +- timeo -= sleep_time; +- sleep_time = 1000000/HZ; +- } else { +- udelay(1); +- cond_resched(); +- timeo--; +- } ++ cfi_udelay(1); + spin_lock(chip->mutex); +- +- while (chip->state != chip_state) { +- /* Someone's suspended the operation: sleep */ +- DECLARE_WAITQUEUE(wait, current); +- set_current_state(TASK_UNINTERRUPTIBLE); +- add_wait_queue(&chip->wq, &wait); +- spin_unlock(chip->mutex); +- schedule(); +- remove_wait_queue(&chip->wq, &wait); +- spin_lock(chip->mutex); +- } + } + ++ if (!z) { ++ if (!--(*chip_op_time)) ++ *chip_op_time = 1; ++ } else if (z > 1) ++ ++(*chip_op_time); ++ + /* Done and happy. */ + chip->state = FL_STATUS; + return 0; +@@ -1107,7 +1107,8 @@ + #endif + + #define WAIT_TIMEOUT(map, chip, adr, udelay) \ +- INVAL_CACHE_AND_WAIT(map, chip, adr, 0, 0, udelay); ++ ({ int __udelay = (udelay); \ ++ INVAL_CACHE_AND_WAIT(map, chip, adr, 0, 0, &__udelay); }) + + + static int do_point_onechip (struct map_info *map, struct flchip *chip, loff_t adr, size_t len) +@@ -1331,7 +1332,7 @@ + + ret = INVAL_CACHE_AND_WAIT(map, chip, adr, + adr, map_bankwidth(map), +- chip->word_write_time); ++ &chip->word_write_time); + if (ret) { + xip_enable(map, chip, adr); + printk(KERN_ERR "%s: word write error (status timeout)\n", map->name); +@@ -1568,7 +1569,7 @@ + + ret = INVAL_CACHE_AND_WAIT(map, chip, cmd_adr, + adr, len, +- chip->buffer_write_time); ++ &chip->buffer_write_time); + if (ret) { + map_write(map, CMD(0x70), cmd_adr); + chip->state = FL_STATUS; +@@ -1703,7 +1704,7 @@ + + ret = INVAL_CACHE_AND_WAIT(map, chip, adr, + adr, len, +- chip->erase_time); ++ &chip->erase_time); + if (ret) { + map_write(map, CMD(0x70), adr); + chip->state = FL_STATUS; |