linux-kernel - Re: [PATCH v2] dts: Disable DMA support on the BK4 vf610 device's fsl

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Message-ID: <20191025120000.5dbb837d@jawa>
Date:   Fri, 25 Oct 2019 12:00:00 +0200
From:   Lukasz Majewski <lukma@...x.de>
To:     Shawn Guo <shawnguo@...nel.org>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Stefan Agner <stefan@...er.ch>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Robin Murphy <robin.murphy@....com>
Subject: Re: [PATCH v2] dts: Disable DMA support on the BK4 vf610 device's
 fsl_lpuart driver

Hi Shawn,

> On Thu, Oct 10, 2019 at 11:08:02AM +0200, Lukasz Majewski wrote:
> > This change disables the DMA support (RX/TX) on the NXP's fsl_lpuart
> > driver - the PIO mode is used instead. This change is necessary for
> > better robustness of BK4's device use cases with many potentially
> > interrupted short serial transfers.
> > 
> > Without it the driver hangs when some distortion happens on UART
> > lines.
> > 
> > Signed-off-by: Lukasz Majewski <lukma@...x.de>
> > Suggested-by: Robin Murphy <robin.murphy@....com>  
> 
> Subject prefix should be 'ARM: dts: ...'.  I fixed it up and applied
> the patch.
> 
> Shawn

Thanks :-)


Best regards,

Lukasz Majewski

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