netdev - RE: [PATCH] net: stmmac: Read user ID muliple times if needed.

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Message-ID: <e878e0e4036a4d69b05dcee717fd7ac5@DRCELLEX03.cellavision.se>
Date:   Wed, 2 Oct 2019 08:02:02 +0000
From:   Hans Andersson <Hans.Andersson@...LAVISION.SE>
To:     Jose Abreu <Jose.Abreu@...opsys.com>,
        "mcoquelin.stm32@...il.com" <mcoquelin.stm32@...il.com>
CC:     "peppe.cavallaro@...com" <peppe.cavallaro@...com>,
        "alexandre.torgue@...com" <alexandre.torgue@...com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] net: stmmac: Read user ID muliple times if needed.

We assert / de-assert the reset line, but the CPU is too fast and the IP is still 
in reset when we later try to read user ID / Synopsys ID. Another option would
be to add a delay after we reset.

-----Original Message-----
From: Jose Abreu <Jose.Abreu@...opsys.com> 
Sent: den 2 oktober 2019 09:52
To: Hans Andersson <Hans.Andersson@...LAVISION.SE>; mcoquelin.stm32@...il.com
Cc: peppe.cavallaro@...com; alexandre.torgue@...com; davem@...emloft.net; netdev@...r.kernel.org; linux-stm32@...md-mailman.stormreply.com; linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org; Hans Andersson <Hans.Andersson@...LAVISION.SE>
Subject: RE: [PATCH] net: stmmac: Read user ID muliple times if needed.

From: Hans Andersson <haan@...lavision.se>
Date: Oct/02/2019, 08:07:21 (UTC+00:00)

> When we read user ID / Synopsys ID we might still be in reset, so read 
> muliple times if needed.

We shouldn't even try to read it if IP is in reset ... 

---
Thanks,
Jose Miguel Abreu