netdev - Re: [EXT] Re: [PATCH v2 net-next 3/3] net: atlantic: implement media detect feature via phy tunables

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Date:   Fri, 2 Oct 2020 17:41:52 +0300
From:   Igor Russkikh <irusskikh@...vell.com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     <netdev@...r.kernel.org>, "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [EXT] Re: [PATCH v2 net-next 3/3] net: atlantic: implement media
 detect feature via phy tunables



>> +	if (val > 0 && val != AQ_HW_MEDIA_DETECT_CNT) {
>> +		netdev_err(self->ndev, "EDPD on this device could have
> only fixed value of %d\n",
>> +			   AQ_HW_MEDIA_DETECT_CNT);
>> +		return -EINVAL;
>> +	}
>> +
>> +	/* msecs plays no role - configuration is always fixed in PHY */
>> +	cfg->is_media_detect = val ? 1 : 0;
>> +
>> +	mutex_lock(&self->fwreq_mutex);
>> +	err = self->aq_fw_ops->set_media_detect(self->aq_hw,
> cfg->is_media_detect);
>> +	mutex_unlock(&self->fwreq_mutex);
>> +
>> +	return err;
>> +}
> 
>> +static int aq_fw2x_set_media_detect(struct aq_hw_s *self, bool on)
>> +{
>> +	u32 enable;
>> +	u32 offset;
>> +
>> +	if (self->fw_ver_actual < HW_ATL_FW_VER_MEDIA_CONTROL)
>> +		return -EOPNOTSUPP;
> 
> So if the firmware is tool old, you return -EOPNOTSUPP. But it appears
> cfg->is_media_detect has already been changed?

Hmm, right. The problem here will be that next --get edpd will return "enabled".

This'll also happen if by some reason FW command will fail to enable EDPD.

Think I have to save 'is_media_detect' only after successful FW operation.

Will send v3, thanks, good catch.

Regards,
  Igor