ath5k: Check EEPROM before tweaking SERDES

* Read PCI-E infos offset from EEPROM and if it points to
   serdes section (0x40), enable serdes programming (further tweaking
   of serdes values during attach). This follows Legacy and Sam's
   HAL sources.

Signed-off-by: Nick Kossifidis <mickflemm@gmail.com>
Acked-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath5k/eeprom.c b/drivers/net/wireless/ath/ath5k/eeprom.c
index c56b494d417a..8af477dd6fc7 100644
--- a/drivers/net/wireless/ath/ath5k/eeprom.c
+++ b/drivers/net/wireless/ath/ath5k/eeprom.c
@@ -167,6 +167,16 @@ ath5k_eeprom_init_header(struct ath5k_hw *ah)
         ee->ee_rfkill_pin = (u8) AR5K_REG_MS(val, AR5K_EEPROM_RFKILL_GPIO_SEL);
         ee->ee_rfkill_pol = val & AR5K_EEPROM_RFKILL_POLARITY ? true : false;
 
+        /* Check if PCIE_OFFSET points to PCIE_SERDES_SECTION
+         * and enable serdes programming if needed.
+         *
+         * XXX: Serdes values seem to be fixed so
+         * no need to read them here, we write them
+         * during ath5k_hw_attach */
+        AR5K_EEPROM_READ(AR5K_EEPROM_PCIE_OFFSET, val);
+        ee->ee_serdes = (val == AR5K_EEPROM_PCIE_SERDES_SECTION) ?
+                                                        true : false;
+
         return 0;
 }