* Fix: watchdog timed out, if flash blank (0xFF) blocks

The current implementation of cfi_flash uses udelay to reset watchdog.
If several blocks are blank (0xff filled) the watchdog timed out.
The reason is, udelay is never called, if flash device is ready to fast.

e.g.
     mw.w $(copy_addr) FFFF 10000;cp.b $(copy_addr) 10880000 20000

     -> watchdog timed out

     mw.w $(copy_addr) 0000 10000;cp.b $(copy_addr) 10880000 20000

     -> watchdog not timed out

This patch adds an extra watchdog reset in front of flash ready check.

Signed-off-by: Jens Scharsig (BuS Elektronik) <esw@bus-elektronik.de>
Signed-off-by: Stefan Roese <sr@denx.de>

diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c
index 5494bcffa7c4b247992f8a7e0e997a4b02cda2bf..722c3fc7bdd17a2ef0e1eb3db30678979046f048 100644 (file)
--- a/drivers/mtd/cfi_flash.c
+++ b/drivers/mtd/cfi_flash.c
@@ -40,6 +40,7 @@
 #include <asm/byteorder.h>
 #include <environment.h>
 #include <mtd/cfi_flash.h>
+#include <watchdog.h>
 
 /*
  * This file implements a Common Flash Interface (CFI) driver for
@@ -577,6 +578,7 @@ static int flash_status_check (flash_info_t * info, flash_sect_t sector,
        reset_timer();
 #endif
        start = get_timer (0);
+       WATCHDOG_RESET();
        while (flash_is_busy (info, sector)) {
                if (get_timer (start) > tout) {
                        printf ("Flash %s timeout at address %lx data %lx\n",
@@ -668,6 +670,7 @@ static int flash_status_poll(flash_info_t *info, void *src, void *dst,
        reset_timer();
 #endif
        start = get_timer(0);
+       WATCHDOG_RESET();
        while (1) {
                switch (info->portwidth) {
                case FLASH_CFI_8BIT: