From: Joel A Fernandes <agnel.joel@gmail.com>
To: Sekhar Nori <nsekhar@ti.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
Joel A Fernandes <joelagnel@ti.com>,
Tony Lindgren <tony@atomide.com>, Matt Porter <matt@ohporter.com>,
Grant Likely <grant.likely@secretlab.ca>,
Rob Herring <rob.herring@calxeda.com>,
Vinod Koul <vinod.koul@intel.com>,
Mark Brown <broonie@opensource.wolfsonmicro.com>,
Benoit Cousson <b-cousson@ti.com>,
Russell King <linux@arm.linux.org.uk>,
Rob Landley <rob@landley.net>,
Andrew Morton <akpm@linux-foundation.org>,
Jason Kridner <jkridner@beagleboard.org>,
Koen Kooi <koen@beagleboard.org>,
Devicetree Discuss <devicetree-discuss@lists.ozlabs.org>,
Linux OMAP List <linux-omap@vger.kernel.org>,
Linux ARM Kernel List <linux-arm-kernel@lists.infradead.org>,
Linux DaVinci Kernel List
<davinci-linux-open-source@linux.davincidsp.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Documentation List <linux-doc@vger.kernel.org>,
Linux MMC List <linux-mmc@vger.kernel.org>,
Linux SPI Devel List <spi-devel-general@lists.sourceforge.net>
Subject: Re: [PATCH v12 05/11] edma: config: Enable config options for EDMA
Date: Mon, 24 Jun 2013 09:48:37 -0500 [thread overview]
Message-ID: <CAD=GYpYrkE--Snc-MoEdJRkUy5TfMY992kd0L--E6yPpMoRaxQ@mail.gmail.com> (raw)
In-Reply-To: <51C83348.6040905@ti.com>
On Mon, Jun 24, 2013 at 6:53 AM, Sekhar Nori <nsekhar@ti.com> wrote:
> On 6/22/2013 8:23 AM, Joel A Fernandes wrote:
>>>>> config TI_EDMA
>>>>> tristate "TI EDMA support"
>>>>> default m if 'ARCH_DAVINCI || ARCH_OMAP1 || ARCH_OMAP2
>>>>> select DMA_ENGINE
>>>>> select DMA_VIRTUAL_CHANNELS
>>>>
>>>>
>>>> MMC depends on EDMA specially on AM33xx there's no PIO mode AFAIK. The
>>>> 'm' option will require some initramfs to load the module when needing
>>>> to MMC boot, I suggest lets leave it as y.
>>>>
>>>
>>> Ah, right: you still export a filter function from the edma driver
>>> and use it in slave drivers:
>>>
>>> drivers/mmc/host/davinci_mmc.c: dma_request_slave_channel_compat(mask, edma_filter_fn,
>>> drivers/mmc/host/davinci_mmc.c: dma_request_slave_channel_compat(mask, edma_filter_fn,
>>> drivers/spi/spi-davinci.c: dspi->dma_rx = dma_request_channel(mask, edma_filter_fn,
>>> drivers/spi/spi-davinci.c: dspi->dma_tx = dma_request_channel(mask, edma_filter_fn,
>>>
>>> As long as this is the case, you have to be careful with the dependencies
>>> to make sure that davinci_mmc and spi-davinci either depend on TI_EDMA, or
>>> edma_filter_fn gets defined to NULL when you are building for a DT-only platform.
>>
>> Yes sure, right now they are defined as follows in include/linux/edma.h:
>>
>> #if defined(CONFIG_TI_EDMA) || defined(CONFIG_TI_EDMA_MODULE)
>> bool edma_filter_fn(struct dma_chan *, void *);
>> #else
>> static inline bool edma_filter_fn(struct dma_chan *chan, void *param)
>> {
>> return false;
>> }
>> #endif
>>
>> This also has the side effect of causing DMA requests to fail if
>> TI_EDMA is not built, causing frustration for a lot of people some of
>> whom don't want to deal with DMA so I think it is OK to build the
>> driver in by default as it is (and will be) used by a lot of
>> OMAP2PLUS.
>
> Solution for this is to enable TI_EDMA in relevant defconfigs. Most
> folks who would get frustrated by such issues would be using defconfigs
> and for those who are building their configuration from scratch this
> will be pretty low in their list of worries.
Yes, it is not in omap2plus_defconfig either. I will post a patch to
add it to the same, and we can ignore the Kconfig defaults and select
patches.
Thanks,
Joel
next prev parent reply other threads:[~2013-06-24 14:55 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-20 21:06 [PATCH v12 00/11] DMA Engine support for AM33XX Joel A Fernandes
2013-06-20 21:06 ` [PATCH v12 01/11] dmaengine: edma: Add TI EDMA device tree binding Joel A Fernandes
2013-06-20 21:06 ` [PATCH v12 02/11] ARM: edma: Add DT and runtime PM support to the private EDMA API Joel A Fernandes
2013-06-21 9:37 ` Sekhar Nori
2013-06-21 9:53 ` [PATCH v13] " Sekhar Nori
2013-06-24 10:06 ` Sekhar Nori
2013-06-21 13:37 ` [PATCH v12 02/11] " Joel A Fernandes
2013-06-20 21:06 ` [PATCH v12 03/11] ARM: edma: Add EDMA crossbar event mux support Joel A Fernandes
2013-06-21 10:12 ` Sekhar Nori
2013-06-21 10:14 ` [PATCH] " Sekhar Nori
2013-06-20 21:06 ` [PATCH v12 04/11] dmaengine: edma: enable build for AM33XX Joel A Fernandes
2013-06-21 10:15 ` Sekhar Nori
2013-06-24 10:17 ` Tony Lindgren
2013-06-24 10:31 ` Sekhar Nori
2013-06-20 21:06 ` [PATCH v12 05/11] edma: config: Enable config options for EDMA Joel A Fernandes
2013-06-21 10:16 ` Sekhar Nori
2013-06-21 13:52 ` Joel A Fernandes
2013-06-21 14:00 ` Arnd Bergmann
2013-06-21 14:20 ` Joel A Fernandes
2013-06-21 14:32 ` Arnd Bergmann
2013-06-21 18:40 ` Joel A Fernandes
2013-06-21 18:44 ` Arnd Bergmann
2013-06-21 21:53 ` Joel A Fernandes
2013-06-21 22:14 ` Arnd Bergmann
2013-06-22 2:53 ` Joel A Fernandes
2013-06-24 11:53 ` Sekhar Nori
2013-06-24 14:48 ` Joel A Fernandes [this message]
2013-06-24 20:28 ` Arnd Bergmann
2013-06-24 20:32 ` Joel A Fernandes
2013-06-24 21:07 ` Arnd Bergmann
2013-06-24 21:09 ` Fernandes, Joel A
2013-06-24 11:23 ` Sekhar Nori
2013-06-24 11:34 ` Sekhar Nori
2013-06-24 20:10 ` Joel A Fernandes
2013-06-20 21:06 ` [PATCH v12 06/11] da8xx: config: Enable MMC and FS options Joel A Fernandes
2013-06-20 21:06 ` [PATCH v12 07/11] ARM: davinci: Fix compiler warnings in devices-da8xx Joel A Fernandes
2013-06-20 21:06 ` [PATCH v12 08/11] spi: omap2-mcspi: add generic DMA request support to the DT binding Joel A Fernandes
2013-06-21 10:35 ` Sourav Poddar
2013-06-20 21:06 ` [PATCH v12 09/11] spi: omap2-mcspi: convert to dma_request_slave_channel_compat() Joel A Fernandes
2013-06-21 10:26 ` Sourav Poddar
2013-06-21 10:37 ` Sekhar Nori
2013-06-21 11:28 ` Mark Brown
2013-06-21 12:22 ` Sourav Poddar
2013-06-20 21:06 ` [PATCH v12 10/11] ARM: dts: add AM33XX EDMA support Joel A Fernandes
2013-08-19 14:22 ` Sebastian Andrzej Siewior
2013-06-20 21:06 ` [PATCH v12 11/11] ARM: dts: add AM33XX SPI DMA support Joel A Fernandes
2013-06-21 10:27 ` [PATCH v12 00/11] DMA Engine support for AM33XX Sekhar Nori
2013-06-22 0:07 ` Joel A Fernandes
2013-06-22 3:36 ` Joel A Fernandes
2013-06-24 10:19 ` Tony Lindgren
2013-06-24 11:39 ` Sekhar Nori
2013-06-24 11:48 ` Sourav Poddar
2013-06-24 14:36 ` Benoit Cousson
2013-06-25 6:54 ` Tony Lindgren
2013-06-25 14:16 ` Sekhar Nori
2013-06-25 14:42 ` Santosh Shilimkar
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