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Message-ID: <20130409190916.GF25316@gmail.com> Date: Tue, 9 Apr 2013 20:09:16 +0100 From: Lee Jones <lee.jones@...aro.org> To: Arnd Bergmann <arnd@...db.de> Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, linus.walleij@...ricsson.com Subject: Re: [PATCH 5/8] dmaengine: ste_dma40: Ensure src and dst registers are configured correctly On Tue, 09 Apr 2013, Arnd Bergmann wrote: > On Tuesday 09 April 2013, Lee Jones wrote: > > Confusingly d40_log_cfg() is used to set up the logical channel > > configuration registers, but d40_phy_cfg() is used to configure > > physical and logical registers, so it should be called in both > > cases. It is the function call's final attribute which determines > > whether it's a physical or logical channel, not whether the > > function is called or not. > > So how did it ever work? Your description sounds like it was > broken all along, but I would assume that someone tested the code. >From what I can see, not. My best guess is that the 'test' was to see if the configuration changed using the debug print at the end of the function. I don't see how else the configuration can be written to hardware. -- Lee Jones Linaro ST-Ericsson Landing Team Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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