target/linux/generic-2.6/patches-2.6.22/002-eeprom_93cx6.patch

   1 From: John W. Linville <linville@tuxdriver.com>
   2 Date: Tue, 12 Jun 2007 01:37:46 +0000 (-0400)
   3 Subject: [PATCH] eeprom_93cx6: shorten pulse timing to match spec
   4 X-Git-Tag: v2.6.23-rc1~1201^2~71
   5 X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=7e9400f178d291b2208c4ed9aac0f425c1364000
   6
   7 [PATCH] eeprom_93cx6: shorten pulse timing to match spec
   8
   9 93cx6 datasheet available here:
  10
  11         http://ww1.microchip.com/downloads/en/DeviceDoc/21749F.pdf
  12
  13 Figure 1-1 and Table 1-2 on pages 4-5 indicate that both Clock High
  14 Time and Clock Low Time have largest minimum times of 450ns.
  15
  16 Signed-off-by: John W. Linville <linville@tuxdriver.com>
  17 ---
  18
  19 diff --git a/drivers/misc/eeprom_93cx6.c b/drivers/misc/eeprom_93cx6.c
  20 index 0d6d742..ac515b0 100644
  21 --- a/drivers/misc/eeprom_93cx6.c
  22 +++ b/drivers/misc/eeprom_93cx6.c
  23 @@ -42,10 +42,10 @@ static inline void eeprom_93cx6_pulse_high(struct eeprom_93cx6 *eeprom)
  24
  25         /*
  26          * Add a short delay for the pulse to work.
  27 -        * According to the specifications the minimal time
  28 -        * should be 450ns so a 1us delay is sufficient.
  29 +        * According to the specifications the "maximum minimum"
  30 +        * time should be 450ns.
  31          */
  32 -       udelay(1);
  33 +       ndelay(450);
  34  }
  35
  36  static inline void eeprom_93cx6_pulse_low(struct eeprom_93cx6 *eeprom)