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iwlwifi: mvm: don't use SAR Geo if basic SAR is not used

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We can't use SAR Geo if basic SAR is not enabled, since the SAR Geo
tables define offsets in relation to the basic SAR table in use.

To fix this, make iwl_mvm_sar_init() return one in case WRDS is not
available, so we can skip reading WGDS entirely.

Fixes: a6bff3cb19 ("iwlwifi: mvm: add GEO_TX_POWER_LIMIT cmd for geographic tx power table")
Cc: stable@vger.kernel.org # 4.12+
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
This commit is contained in:
Luca Coelho 2018-10-17 08:35:15 +03:00
parent 54f3f994e9
commit 5d041c46cc
1 changed files with 28 additions and 8 deletions
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36
drivers/net/wireless/intel/iwlwifi/mvm/fw.c
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@ -928,6 +928,11 @@ static int iwl_mvm_sar_get_ewrd_table(struct iwl_mvm *mvm)
return -ENOENT;
}
static int iwl_mvm_sar_get_wgds_table(struct iwl_mvm *mvm)
{
return -ENOENT;
}
static int iwl_mvm_sar_geo_init(struct iwl_mvm *mvm)
{
return 0;
@ -954,8 +959,11 @@ static int iwl_mvm_sar_init(struct iwl_mvm *mvm)
IWL_DEBUG_RADIO(mvm,
"WRDS SAR BIOS table invalid or unavailable. (%d)\n",
ret);
/* if not available, don't fail and don't bother with EWRD */
return 0;
/*
* If not available, don't fail and don't bother with EWRD.
* Return 1 to tell that we can't use WGDS either.
*/
return 1;
}
ret = iwl_mvm_sar_get_ewrd_table(mvm);
@ -968,9 +976,13 @@ static int iwl_mvm_sar_init(struct iwl_mvm *mvm)
/* choose profile 1 (WRDS) as default for both chains */
ret = iwl_mvm_sar_select_profile(mvm, 1, 1);
/* if we don't have profile 0 from BIOS, just skip it */
/*
* If we don't have profile 0 from BIOS, just skip it. This
* means that SAR Geo will not be enabled either, even if we
* have other valid profiles.
*/
if (ret == -ENOENT)
return 0;
return 1;
return ret;
}
@ -1168,11 +1180,19 @@ int iwl_mvm_up(struct iwl_mvm *mvm)
iwl_mvm_unref(mvm, IWL_MVM_REF_UCODE_DOWN);
ret = iwl_mvm_sar_init(mvm);
if (ret)
goto error;
if (ret == 0) {
ret = iwl_mvm_sar_geo_init(mvm);
} else if (ret > 0 && !iwl_mvm_sar_get_wgds_table(mvm)) {
/*
* If basic SAR is not available, we check for WGDS,
* which should *not* be available either. If it is
* available, issue an error, because we can't use SAR
* Geo without basic SAR.
*/
IWL_ERR(mvm, "BIOS contains WGDS but no WRDS\n");
}
ret = iwl_mvm_sar_geo_init(mvm);
if (ret)
if (ret < 0)
goto error;
iwl_mvm_leds_sync(mvm);