linux-kernel - Re: [PATCH] mtd: spi-nor: cadence-quadspi: Add DMA support for direct mode reads

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Message-ID: <70777773-8ade-bd42-e75a-6d5d9c3e50a2@gmail.com>
Date:   Tue, 10 Apr 2018 11:21:03 +0200
From:   Marek Vasut <marek.vasut@...il.com>
To:     Vignesh R <vigneshr@...com>
Cc:     Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Linux ARM Mailing List <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] mtd: spi-nor: cadence-quadspi: Add DMA support for direct
 mode reads

On 04/10/2018 10:19 AM, Vignesh R wrote:
> Add support to use DMA over memory mapped reads in direct mode. This
> helps in reducing CPU usage from ~100% to ~10% when reading data from
> flash. For non-DMA'able/vmalloc'd buffers, driver just falls back to CPU
> based memcpy.
> 
> Signed-off-by: Vignesh R <vigneshr@...com>

Reviewed-by: Marek Vasut <marek.vasut@...il.com>

-- 
Best regards,
Marek Vasut