ath9k: Fix ASPM for AR9462

If the L1 entrance latency is not calibrated properly
in the EEPROM in WB222 boards, there could be problems
in connectivity. Check and correct the calibrated value
if it doesn't match the optimal value for WB222, 4us.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/ath9k/ar9003_hw.c b/drivers/net/wireless/ath/ath9k/ar9003_hw.c
index 738aa7e454d86aab8d0199354a1618a4764297ff..582cddddddd7f1dd4e2a5ef7ac84238512573d78 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/ar9003_hw.c
+++ b/drivers/net/wireless/ath/ath9k/ar9003_hw.c
@@ -745,6 +745,20 @@ static void ar9003_hw_init_mode_gain_regs(struct ath_hw *ah)
 static void ar9003_hw_configpcipowersave(struct ath_hw *ah,
                                         bool power_off)
 {
+       /*
+        * Increase L1 Entry Latency. Some WB222 boards don't have
+        * this change in eeprom/OTP.
+        *
+        */
+       if (AR_SREV_9462(ah)) {
+               u32 val = ah->config.aspm_l1_fix;
+               if ((val & 0xff000000) == 0x17000000) {
+                       val &= 0x00ffffff;
+                       val |= 0x27000000;
+                       REG_WRITE(ah, 0x570c, val);
+               }
+       }
+
        /* Nothing to do on restore for 11N */
        if (!power_off /* !restore */) {
                /* set bit 19 to allow forcing of pcie core into L1 state */

diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h
index fa543a62e8398e4cec46611f329df643ba48b03f..69a907b55a73b129fae1171f2d9859a3303ec3e7 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h
@@ -311,6 +311,7 @@ struct ath9k_ops_config {
        u16 ani_poll_interval; /* ANI poll interval in ms */
 
        /* Platform specific config */
+       u32 aspm_l1_fix;
        u32 xlna_gpio;
        u32 ant_ctrl_comm2g_switch_enable;
        bool xatten_margin_cfg;

diff --git a/drivers/net/wireless/ath/ath9k/pci.c b/drivers/net/wireless/ath/ath9k/pci.c
index 32807987dd677d3b4e5f81f22599f5f7445140e4..e7996a64a49dde8fb962a10c2b4d164e4d6aeab6 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/pci.c
+++ b/drivers/net/wireless/ath/ath9k/pci.c
@@ -314,6 +314,22 @@ static void ath_pci_aspm_init(struct ath_common *common)
                return;
        }
 
+       /*
+        * 0x70c - Ack Frequency Register.
+        *
+        * Bits 27:29 - DEFAULT_L1_ENTRANCE_LATENCY.
+        *
+        * 000 : 1 us
+        * 001 : 2 us
+        * 010 : 4 us
+        * 011 : 8 us
+        * 100 : 16 us
+        * 101 : 32 us
+        * 110/111 : 64 us
+        */
+       if (AR_SREV_9462(ah))
+               pci_read_config_dword(pdev, 0x70c, &ah->config.aspm_l1_fix);
+
        pcie_capability_read_word(parent, PCI_EXP_LNKCTL, &aspm);
        if (aspm & (PCI_EXP_LNKCTL_ASPM_L0S | PCI_EXP_LNKCTL_ASPM_L1)) {
                ah->aspm_enabled = true;