linux-kernel - Re: [PATCH v3 3/3] spi: spi-davinci: convert to DMA engine API

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Message-ID: <503F75C0.1050507@ti.com>
Date:	Thu, 30 Aug 2012 19:46:32 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	Matt Porter <mporter@...com>
CC:	<vinod.koul@...el.com>, <cjb@...top.org>,
	<grant.likely@...retlab.ca>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux MMC List <linux-mmc@...r.kernel.org>,
	Linux SPI Devel List 
	<spi-devel-general@...ts.sourceforge.net>,
	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>
Subject: Re: [PATCH v3 3/3] spi: spi-davinci: convert to DMA engine API

Hi Matt,

On 8/23/2012 6:39 AM, Matt Porter wrote:
> Removes use of the DaVinci EDMA private DMA API and replaces
> it with use of the DMA engine API.
> 
> Signed-off-by: Matt Porter <mporter@...com>

I tried testing this patch on my OMAP-L138 EVM, but SPI fails to 
initialize after applying the patch.

root@...go:~# dmesg | grep -i spi                                               
spi_davinci spi_davinci.1: request RX DMA channel failed                        

without these 3 patches, SPI flash is detected fine (same kernel 
configuration):

root@...go:~# dmesg | grep spi                                                  
spi_davinci spi_davinci.1: DMA: supported                                       
spi_davinci spi_davinci.1: DMA: RX channel: 18, TX channel: 19, event queue: 0  
spi_davinci spi_davinci.1: master is unqueued, this is deprecated               
m25p80 spi1.0: m25p64 (8192 Kbytes)                                             
spi_davinci spi_davinci.1: Controller at 0xfef0e000                             

Any idea what could be wrong? This is v3.6-rc3 kernel. I can provide 
full bootlogs or any other debug information if that helps.

Thanks,
Sekhar
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