From: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
To: "Shimoda, Yoshihiro" <yoshihiro.shimoda.uh@renesas.com>
Cc: linux-kernel@vger.kernel.org, linux-sh@vger.kernel.org,
Vinod Koul <vinod.koul@intel.com>,
Magnus Damm <magnus.damm@gmail.com>,
linux-mmc@vger.kernel.org, alsa-devel@alsa-project.org,
linux-serial@vger.kernel.org, Paul Mundt <lethal@linux-sh.org>
Subject: Re: [PATCH 1/7 v2] dmaengine: add a simple dma library
Date: Fri, 3 Feb 2012 11:21:46 +0100 (CET) [thread overview]
Message-ID: <Pine.LNX.4.64.1202031114560.6211@axis700.grange> (raw)
In-Reply-To: <4F2B9F34.60308@renesas.com>
On Fri, 3 Feb 2012, Shimoda, Yoshihiro wrote:
> Hi Guennadi-san,
>
> 2012/02/03 7:19, Guennadi Liakhovetski wrote:
> [ snip ]
> >>
> >> Thank you for your comment.
> >>
> >> I investigaed the issue. I found out the renesas_usbhs driver may
> >> call tx_submit() in the callback() of the dma-simple finally.
> >
> > Sorry, in my first reply to this your email I misread the renesas_usbhs
> > for an issue with your new SUDMAC driver. Since this is not the case and
> > my patch seems to be causing a regression, I'll look at it.
>
> Thank you for the comment.
>
> I found out that if the "power_up" is 0 in the sample_tx_submit(),
> the pm_state will be changed to "PENDING".
> And then, even if the renesas_usbhs calls dma_async_issue_pending(),
> the dma-simple driver doesn't call the simple_chan_xfer_ld_queue().
> This is because the driver will call the simple_chan_xfer_ld_queue()
> when the pm_state is "ESTABLISHED" only.
>
> So I guess that we have to modify the simple_issue_pending().
Ok, I looked at this code, there's now a comment in simple_tx_submit():
if (power_up) {
...
} else {
/*
* Tell .device_issue_pending() not to run the queue, interrupts
* will do it anyway
*/
schan->pm_state = DMA_SIMPLE_PM_PENDING;
}
And that's exactly what should be happening: an interrupt should trigger
the IRQ thread should call simple_chan_xfer_ld_queue(), so, looks like the
interrupt is not coming? It's also strange, why and how it worked without
dma-simple? I don't think I changed that with the transition...
Investigating.
Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
next prev parent reply other threads:[~2012-02-03 10:22 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-26 14:56 [PATCH 0/7 v2] extract a simple dmaengine library from shdma.c Guennadi Liakhovetski
2012-01-26 14:56 ` [PATCH 1/7 v2] dmaengine: add a simple dma library Guennadi Liakhovetski
2012-01-26 17:34 ` [alsa-devel] " Sascha Hauer
2012-01-26 21:07 ` Guennadi Liakhovetski
2012-01-27 8:37 ` Shimoda, Yoshihiro
2012-01-27 8:48 ` Guennadi Liakhovetski
2012-01-31 11:03 ` Shimoda, Yoshihiro
2012-02-01 0:52 ` Guennadi Liakhovetski
2012-02-01 2:47 ` Shimoda, Yoshihiro
2012-02-02 22:19 ` Guennadi Liakhovetski
2012-02-03 8:47 ` Shimoda, Yoshihiro
2012-02-03 10:21 ` Guennadi Liakhovetski [this message]
2012-02-03 15:43 ` [PATCH/RFC] usb: fix renesas_usbhs to not schedule in atomic context Guennadi Liakhovetski
2012-02-05 14:54 ` Felipe Balbi
2012-02-06 10:11 ` Guennadi Liakhovetski
2012-02-06 10:31 ` Felipe Balbi
2012-02-06 8:52 ` Shimoda, Yoshihiro
2012-01-30 8:32 ` [PATCH 1/7 v2] dmaengine: add a simple dma library Vinod Koul
2012-01-30 9:34 ` Guennadi Liakhovetski
2012-01-31 6:41 ` Vinod Koul
2012-01-31 8:59 ` Guennadi Liakhovetski
2012-02-01 5:38 ` Vinod Koul
2012-02-03 16:38 ` Guennadi Liakhovetski
2012-02-06 2:54 ` Vinod Koul
2012-02-06 9:53 ` Guennadi Liakhovetski
2012-01-26 14:56 ` [PATCH 2/7 v2] dma: shdma: prepare for simple DMA conversion Guennadi Liakhovetski
2012-01-26 14:56 ` [PATCH 3/7 v2] mmc: sh_mmcif: remove unneeded struct sh_mmcif_dma, prepare for simple DMA Guennadi Liakhovetski
2012-01-26 14:56 ` [PATCH 4/7 v2] mmc: sh_mobile_sdhi: prepare for conversion to " Guennadi Liakhovetski
2012-01-26 14:56 ` [PATCH 5/7 v2] serial: sh-sci: " Guennadi Liakhovetski
2012-01-26 14:56 ` [PATCH 6/7 v2] ASoC: SIU: " Guennadi Liakhovetski
2012-02-06 2:33 ` Vinod Koul
2012-02-06 9:11 ` Guennadi Liakhovetski
2012-01-26 14:56 ` [PATCH 7/7 v2] dma: shdma: convert to the simple DMA library Guennadi Liakhovetski
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