iwlwifi: Adjust blink rate to compensate Clock difference

Adjust led blink rate to compensate on a MAC Clock difference on every
HW. Led blink rate analysis showed an average deviation of 0% on 3945,
5% on 4965 HW and 20% on 5000 series and up.
Need to compensate on the led on/off time per HW according to the
deviation to achieve the desired led frequency
The calculation is: (100-averageDeviation)/100 * blinkTime
For code efficiency the calculation will be:
    compensation = (100 - averageDeviation) * 64 / 100
    NewBlinkTime = (compensation * BlinkTime) / 64

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-3945.c b/drivers/net/wireless/iwlwifi/iwl-3945.c
index e70c5b0af364..33e40c21eb72 100644
--- a/drivers/net/wireless/iwlwifi/iwl-3945.c
+++ b/drivers/net/wireless/iwlwifi/iwl-3945.c
@@ -2894,6 +2894,7 @@ static struct iwl_cfg iwl3945_bg_cfg = {
         .mod_params = &iwl3945_mod_params,
         .use_isr_legacy = true,
         .ht_greenfield_support = false,
+        .led_compensation = 64,
 };
 
 static struct iwl_cfg iwl3945_abg_cfg = {
@@ -2908,6 +2909,7 @@ static struct iwl_cfg iwl3945_abg_cfg = {
         .mod_params = &iwl3945_mod_params,
         .use_isr_legacy = true,
         .ht_greenfield_support = false,
+        .led_compensation = 64,
 };
 
 struct pci_device_id iwl3945_hw_card_ids[] = {