netdev - Re: [PATCH 2/3] net: qcom/emac: do not reset the EMAC during initialization

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Message-Id: <20170623.145423.192194307144112349.davem@davemloft.net>
Date:   Fri, 23 Jun 2017 14:54:23 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     timur@...eaurora.org
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH 2/3] net: qcom/emac: do not reset the EMAC during
 initialization

From: Timur Tabi <timur@...eaurora.org>
Date: Fri, 23 Jun 2017 13:37:58 -0500

> On 06/23/2017 01:00 PM, David Miller wrote:
>> What if the boot loader or something else left the chip in
>> a weird state?
> 
> We depend on the boot loader leaving the NIC in a very specific state
> already, otherwise the driver can't initialize the hardware.  The
> firmware has to pre-initialize the EMAC for us.
> 
> Not only that, but the driver was resetting the MAC *after*
> programming the clocks (on non-ACPI systems) and initializing both
> PHYs.
> 
>> I'm not applying this.
>> If it's correct, the explanation in this commit message need
>> to be imporved.  The change must be better justified.
> 
> Since this is for ACPI systems, I could do this:
> 
> 	if (!has_acpi_companion(&pdev->dev))
> 		emac_mac_reset(adpt);
> 
> But at the very least, the call should be moved to earlier in the
> function.

Please just explain the ACPI situation in the commit log message
and resubmit the series.

Thanks.