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Re: [PATCH 16/16] iwlwifi: mvm: fix version check for GEO_TX_POWER_LIMIT support

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Am Samstag, den 20.07.2019, 13:25 +0300 schrieb Luca Coelho:
> From: Luca Coelho <
> luciano.coelho@xxxxxxxxx
> >
> 
> We erroneously added a check for FW API version 41 before sending
> GEO_TX_POWER_LIMIT, but this was already implemented in version 38.
> Additionally, it was cherry-picked to older versions, namely 17, 26
> and 29, so check for those as well.
> 
> Signed-off-by: Luca Coelho <
> luciano.coelho@xxxxxxxxx
> >
> ---
>  drivers/net/wireless/intel/iwlwifi/mvm/fw.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
> index a837cf40afde..00c89bcfdf6a 100644
> --- a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
> +++ b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
> @@ -886,9 +886,14 @@ static bool iwl_mvm_sar_geo_support(struct iwl_mvm *mvm)
>  	 * The GEO_TX_POWER_LIMIT command is not supported on earlier
>  	 * firmware versions.  Unfortunately, we don't have a TLV API
>  	 * flag to rely on, so rely on the major version which is in
> -	 * the first byte of ucode_ver.
> +	 * the first byte of ucode_ver.  This was implemented
> +	 * initially on version 38 and then backported to 36, 29 and
> +	 * 17.
>  	 */
> -	return IWL_UCODE_SERIAL(mvm->fw->ucode_ver) >= 41;
> +	return IWL_UCODE_SERIAL(mvm->fw->ucode_ver) >= 38 ||
> +	       IWL_UCODE_SERIAL(mvm->fw->ucode_ver) == 36 ||
> +	       IWL_UCODE_SERIAL(mvm->fw->ucode_ver) == 29 ||
> +	       IWL_UCODE_SERIAL(mvm->fw->ucode_ver) == 17;
>  }
>  
>  int iwl_mvm_get_sar_geo_profile(struct iwl_mvm *mvm)

After pulling iwlwifi-fixes-for-kvalo-2019-07-30, I still get firmware
crashes on my "Intel(R) Dual Band Wireless AC 8260" which uses firmware
version 36. I tried the latest ucode in linux-firmware (36.77d01142.0),
but it seems GEO_TX_POWER_LIMIT is not yet implemented there.

Could you let me know which firmware version I need for Linux 5.3? Can
there be a check in iwl_mvm_sar_geo_support() that the backported
support is indeed available?

Thanks,
Jonas

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