[PATCH 4.1 13/78] iwlwifi: pcie: fix prepare card flow

Greg Kroah-Hartman
2015-09-11T22:50:32Z

From: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

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>

---
drivers/net/wireless/iwlwifi/pcie/trans.c | 22 +++++++++++++++++++---
1 file changed, 19 insertions(+), 3 deletions(-)

--- 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
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(stru
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(stru

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(stru

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;
}