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Message-Id: <20191206.115050.2225203369041453711.davem@davemloft.net>
Date: Fri, 06 Dec 2019 11:50:50 -0800 (PST)
From: David Miller <davem@...emloft.net>
To: neidhard.kim@....com
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-stm32@...md-mailman.stormreply.com,
mcoquelin.stm32@...il.com, joabreu@...opsys.com,
alexandre.torgue@...com, peppe.cavallaro@...com
Subject: Re: [PATCH] net: stmmac: reset Tx desc base address before
restarting Tx
From: Jongsung Kim <neidhard.kim@....com>
Date: Fri, 6 Dec 2019 20:40:00 +0900
> Refer to the databook of DesignWare Cores Ethernet MAC Universal:
>
> 6.2.1.5 Register 4 (Transmit Descriptor List Address Register
>
> If this register is not changed when the ST bit is set to 0, then
> the DMA takes the descriptor address where it was stopped earlier.
>
> The stmmac_tx_err() does zero indices to Tx descriptors, but does
> not reset HW current Tx descriptor address. To fix inconsistency,
> the base address of the Tx descriptors should be rewritten before
> restarting Tx.
>
> Signed-off-by: Jongsung Kim <neidhard.kim@....com>
Applied.
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