Re: [PATCH] iwlwifi: fw: don't send GEO_TX_POWER_LIMIT command to FW version 29

[Luciano Coelho <luciano.coelho@intel.com>]

On Tue, 2019-10-08 at 14:05 +0800, You-Sheng Yang wrote:
> Follow-up for commit fddbfeece9c7 ("iwlwifi: fw: don't send
> GEO_TX_POWER_LIMIT command to FW version 36"). There is no
> GEO_TX_POWER_LIMIT command support for all revisions of FW version
> 29, either.
> 
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=204151
> Signed-off-by: You-Sheng Yang <vicamo.yang@canonical.com>
> ---
>  drivers/net/wireless/intel/iwlwifi/mvm/fw.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
> index 32a5e4e5461f..dbba616c19de 100644
> --- a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
> +++ b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
> @@ -889,14 +889,14 @@ static bool iwl_mvm_sar_geo_support(struct iwl_mvm *mvm)
>  	 * 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.  This was implemented
> -	 * initially on version 38 and then backported to29 and 17.
> +	 * initially on version 38 and then backported to 29 and 17.
>  	 * The intention was to have it in 36 as well, but not all
>  	 * 8000 family got this feature enabled.  The 8000 family is
>  	 * the only one using version 36, so skip this version
> -	 * entirely.
> +	 * entirely. All revisions of -29 fw still don't have
> +	 * GEO_TX_POWER_LIMIT supported yet.
>  	 */
>  	return IWL_UCODE_SERIAL(mvm->fw->ucode_ver) >= 38 ||
> -	       IWL_UCODE_SERIAL(mvm->fw->ucode_ver) == 29 ||
>  	       IWL_UCODE_SERIAL(mvm->fw->ucode_ver) == 17;
>  }

Thanks for the patch!

But I have investigated this (even) further and now I see that 3168
doesn't have this command, but 7265D does.  The latter also uses -29,
so we can't blindly disable all -29 versions.

Can you try this instead?

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
index 0d2229319261..38d89ee9bd28 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
@@ -906,8 +906,10 @@ static bool iwl_mvm_sar_geo_support(struct iwl_mvm
*mvm)
         * entirely.
         */
        return IWL_UCODE_SERIAL(mvm->fw->ucode_ver) >= 38 ||
-              IWL_UCODE_SERIAL(mvm->fw->ucode_ver) == 29 ||
-              IWL_UCODE_SERIAL(mvm->fw->ucode_ver) == 17;
+              IWL_UCODE_SERIAL(mvm->fw->ucode_ver) == 17 ||
+              (IWL_UCODE_SERIAL(mvm->fw->ucode_ver) == 29 &&
+               (mvm->trans->hw_rev &
+                CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_7265D);
 }
 
 int iwl_mvm_get_sar_geo_profile(struct iwl_mvm *mvm)


--
Cheers,
Luca.