linux-kernel - Re: [PATCH net] net: ethernet: ti: am65-cpsw-nuss: cleanup DMA Channels before using them

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Message-ID: <15cbf6f1-0eb5-4f26-80e3-2f9fc9b30e4f@kernel.org>
Date: Wed, 17 Apr 2024 18:51:31 +0300
From: Roger Quadros <rogerq@...nel.org>
To: Siddharth Vadapalli <s-vadapalli@...com>, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
 dan.carpenter@...aro.org, robh@...nel.org, jpanis@...libre.com,
 u.kleine-koenig@...gutronix.de
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, spatton@...com, srk@...com
Subject: Re: [PATCH net] net: ethernet: ti: am65-cpsw-nuss: cleanup DMA
 Channels before using them

On 17/04/2024 12:54, Siddharth Vadapalli wrote:
> The TX and RX DMA Channels used by the driver to exchange data with CPSW
> are not guaranteed to be in a clean state during driver initialization.
> The Bootloader could have used the same DMA Channels without cleaning them
> up in the event of failure. Thus, reset and disable the DMA Channels to
> ensure that they are in a clean state before using them.
> 
> Fixes: 93a76530316a ("net: ethernet: ti: introduce am65x/j721e gigabit eth subsystem driver")
> Reported-by: Schuyler Patton <spatton@...com>
> Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>

Reviewed-by: Roger Quadros <rogerq@...nel.org>