iwlwifi: pcie: fix prepare card flow

commit c9fdec9f3970eeaa1b176422f46167f5f5158804 upstream.

When the card is not owned by the PCIe bus, we need to
acquire ownership first. This flow is implemented in
iwl_pcie_prepare_card_hw. Because of a hardware bug, we
need to disable link power management before we can
request ownership otherwise the other user of the device
won't get notified that we are requesting the device which
will prevent us from acquire ownership.

Same holds for the down flow where we need to make sure
that any other potential user is notified that the driver
is going down.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/wireless/iwlwifi/pcie/trans.c b/drivers/net/wireless/iwlwifi/pcie/trans.c
index 37e6a6f914872c1b3a781b2303d9a1ea02131e90..699a4802835fa6e8ceb6aaa6a2faa1c7f9068c0e 100644 (file)
--- a/drivers/net/wireless/iwlwifi/pcie/trans.c
+++ b/drivers/net/wireless/iwlwifi/pcie/trans.c
@@ -457,10 +457,16 @@ static void iwl_pcie_apm_stop(struct iwl_trans *trans, bool op_mode_leave)
                if (trans->cfg->device_family == IWL_DEVICE_FAMILY_7000)
                        iwl_set_bits_prph(trans, APMG_PCIDEV_STT_REG,
                                          APMG_PCIDEV_STT_VAL_WAKE_ME);
-               else if (trans->cfg->device_family == IWL_DEVICE_FAMILY_8000)
+               else if (trans->cfg->device_family == IWL_DEVICE_FAMILY_8000) {
+                       iwl_set_bit(trans, CSR_DBG_LINK_PWR_MGMT_REG,
+                                   CSR_RESET_LINK_PWR_MGMT_DISABLED);
                        iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG,
                                    CSR_HW_IF_CONFIG_REG_PREPARE |
                                    CSR_HW_IF_CONFIG_REG_ENABLE_PME);
+                       mdelay(1);
+                       iwl_clear_bit(trans, CSR_DBG_LINK_PWR_MGMT_REG,
+                                     CSR_RESET_LINK_PWR_MGMT_DISABLED);
+               }
                mdelay(5);
        }
 
@@ -555,6 +561,10 @@ static int iwl_pcie_prepare_card_hw(struct iwl_trans *trans)
        if (ret >= 0)
                return 0;
 
+       iwl_set_bit(trans, CSR_DBG_LINK_PWR_MGMT_REG,
+                   CSR_RESET_LINK_PWR_MGMT_DISABLED);
+       msleep(1);
+
        for (iter = 0; iter < 10; iter++) {
                /* If HW is not ready, prepare the conditions to check again */
                iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG,
@@ -562,8 +572,10 @@ static int iwl_pcie_prepare_card_hw(struct iwl_trans *trans)
 
                do {
                        ret = iwl_pcie_set_hw_ready(trans);
-                       if (ret >= 0)
-                               return 0;
+                       if (ret >= 0) {
+                               ret = 0;
+                               goto out;
+                       }
 
                        usleep_range(200, 1000);
                        t += 200;
@@ -573,6 +585,10 @@ static int iwl_pcie_prepare_card_hw(struct iwl_trans *trans)
 
        IWL_ERR(trans, "Couldn't prepare the card\n");
 
+out:
+       iwl_clear_bit(trans, CSR_DBG_LINK_PWR_MGMT_REG,
+                     CSR_RESET_LINK_PWR_MGMT_DISABLED);
+
        return ret;
 }