netdev - Re: [PATCH 3/5 v2] net/cpsw: don't rely only on netif_running() to check which device is active

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Date:	Mon, 22 Apr 2013 12:19:37 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Mugunthan V N <mugunthanvnm@...com>
CC:	netdev@...r.kernel.org, tglx@...utronix.de,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 3/5 v2] net/cpsw: don't rely only on netif_running() to
 check which device is active

On 04/22/2013 12:12 PM, Mugunthan V N wrote:
> 
> Yes, when interrupt is disabled in hardware then interrupt must be
> disabled.
> In my initial days i have verified it, CPSW doesn't allow any new
> interrupts to
> propagate  to arm if CPSW interrupt is disabled which is correct. CPSW irq
> signal is not directly connected to irq controller, it is connected via
> edge to
> level conversion so it is a kind of latched interrupt and so the
> interrupt has
> to be disabled in interrupt controller to disable the interrupt, else
> arm get
> blocked in CPSW ISR.
> 
> This behavior is not only in AM335x CPSW, it is as is from its previous
> versions in TI814x and TI8107.

And I don't see this on ES1.0 because they forgot to add the
edge-to-level converter?

> Regards
> Mugunthan V N

Sebastian
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