From: Stefano Babic <sbabic@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 3/3 V2] MX28: SPI: Add DMA transfer support
Date: Mon, 16 Jul 2012 17:03:18 +0200 [thread overview]
Message-ID: <50042D36.9030902@denx.de> (raw)
In-Reply-To: <1341830913-12213-3-git-send-email-marex@denx.de>
On 09/07/2012 12:48, Marek Vasut wrote:
> The DMA transfers happen only if the transfered data are larger
> than 512 bytes. Otherwise PIO is used. This is a small speed
> optimization.
>
> The DMA transfer doesn't work if unaligned transfer is requested
> due to the limitation of the DMA controller. This has to be fixed
> by introducing generic bounce buffer. Therefore the DMA feature
> is now disabled by default.
>
> Signed-off-by: Marek Vasut <marex@denx.de>
> Cc: Fabio Estevam <festevam@gmail.com>
> Cc: Otavio Salvador <otavio@ossystems.com.br>
> Cc: Stefano Babic <sbabic@denx.de>
> Cc: Wolfgang Denk <wd@denx.de>
> ---
Applied to u-boot-imx, next branch, thanks.
Best regards,
Stefano Babic
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next prev parent reply other threads:[~2012-07-16 15:03 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-09 10:48 [U-Boot] [PATCH 1/3 V2] MX28: SPI: Refactor spi_xfer a bit Marek Vasut
2012-07-09 10:48 ` [U-Boot] [PATCH 2/3 RESEND] MX28: SPI: Pull out the PIO transfer function Marek Vasut
2012-07-16 15:03 ` Stefano Babic
2012-07-09 10:48 ` [U-Boot] [PATCH 3/3 V2] MX28: SPI: Add DMA transfer support Marek Vasut
2012-07-16 15:03 ` Stefano Babic [this message]
2012-07-16 15:03 ` [U-Boot] [PATCH 1/3 V2] MX28: SPI: Refactor spi_xfer a bit Stefano Babic
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