From: vipin.kumar@st•com (Vipin Kumar)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 07/11] fsmc/nand: Provide contiguous buffers to dma
Date: Thu, 11 Oct 2012 09:37:16 +0530 [thread overview]
Message-ID: <507645F4.1060607@st.com> (raw)
In-Reply-To: <CAOh2x==Up=mOc+YA6-yKD7xpoxFyzfb-XtoQ6DENTXayTa=vtA@mail.gmail.com>
On 10/11/2012 8:46 AM, viresh kumar wrote:
> On Wed, Oct 10, 2012 at 10:37 PM, Linus Walleij
> <linus.walleij@linaro•org> wrote:
>> The real problem is likely the DMA driver. The stuf that get
>> fed into dma.device_prep_dma_memcpy() needs to be
>> converted to a scatterlist and then set up in the LLI list
>> for the controller.
>>
>> IIRC SPEAr is using drivers/dma/dw_dmac.c so
>
> Both dw_dmac and pl080 for different SPEAr SoC's.
>
>> check this driver's dwc_prep_dma_memcpy().
>> It does seem like it is checking whether src or
>> dest is scattered in this for() loop:
>>
>> for (offset = 0; offset< len; offset += xfer_count<< src_width) {}
>>
>> dma_sync_single_for_device() is translating the virtual
>> address to physical for every chunk BTW.
>>
>> So instead of doing this copying, debug the problem, and
>> see if there is a bug in that for()-loop or similar, if it needs
>> to be rewritten or so.
>
> But what's the problem you saw vipin, for which you generated this patch?
> .
>
The nand tests were failing and that was because of a user pointer being
passed to them but it was a long time back and this patch just carried
on in the local repo. It is only now that I am sending it
It seems may be the dma drivers also got updated so it needs another
test cycle it. I will do the needful and re-reply back on this mail
Vipin
next prev parent reply other threads:[~2012-10-11 4:07 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-09 10:44 [PATCH 00/11] mtd/nand: fsmc driver updates Vipin Kumar
2012-10-09 10:44 ` [PATCH 01/11] fsmc/nand:FIX: Change the type for regs to void __iomem * Vipin Kumar
2012-10-09 17:14 ` viresh kumar
2012-10-10 16:49 ` Linus Walleij
2012-10-17 12:30 ` Artem Bityutskiy
2012-10-09 10:44 ` [PATCH 02/11] fsmc/nand: Rearrange the fsmc_nand_data structure and update comments Vipin Kumar
2012-10-09 11:52 ` Jean-Christophe PLAGNIOL-VILLARD
2012-10-11 4:24 ` Vipin Kumar
2012-10-09 17:15 ` viresh kumar
2012-10-09 10:44 ` [PATCH 03/11] fsmc/nand: Support multiple banks connected to controller Vipin Kumar
2012-10-09 11:55 ` Jean-Christophe PLAGNIOL-VILLARD
2012-10-10 10:28 ` Vipin Kumar
2012-10-17 12:31 ` Artem Bityutskiy
2012-10-09 10:44 ` [PATCH 04/11] fsmc/nand: Accept nand timing parameters via DT Vipin Kumar
2012-10-09 11:57 ` Jean-Christophe PLAGNIOL-VILLARD
2012-10-11 4:25 ` Vipin Kumar
2012-10-09 17:20 ` viresh kumar
2012-10-09 10:44 ` [PATCH 05/11] fsmc: Implement ready/busy through gpio pin Vipin Kumar
2012-10-09 11:59 ` Jean-Christophe PLAGNIOL-VILLARD
2012-10-09 17:34 ` viresh kumar
2012-10-09 10:44 ` [PATCH 06/11] fsmc/nand: Modify the wait to uninterruptible Vipin Kumar
2012-10-10 17:10 ` Linus Walleij
2012-10-17 12:47 ` Artem Bityutskiy
2012-10-09 10:44 ` [PATCH 07/11] fsmc/nand: Provide contiguous buffers to dma Vipin Kumar
2012-10-09 17:41 ` viresh kumar
2012-10-10 17:07 ` Linus Walleij
2012-10-11 3:16 ` viresh kumar
2012-10-11 4:07 ` Vipin Kumar [this message]
2012-10-11 4:08 ` Vipin Kumar
2012-10-11 4:15 ` viresh kumar
2012-10-11 16:06 ` Linus Walleij
2012-10-11 17:07 ` viresh kumar
2012-10-11 21:51 ` Linus Walleij
2012-10-12 3:55 ` Vipin Kumar
2012-10-15 13:18 ` Artem Bityutskiy
2012-10-15 16:27 ` Brian Norris
2012-10-15 19:51 ` Linus Walleij
2012-10-16 7:14 ` Artem Bityutskiy
2012-10-16 10:05 ` Linus Walleij
2012-10-21 7:38 ` Brian Norris
2012-10-21 11:00 ` Artem Bityutskiy
2012-10-21 12:02 ` Artem Bityutskiy
2012-10-16 7:11 ` Artem Bityutskiy
2012-10-21 7:21 ` Brian Norris
2012-10-09 10:44 ` [PATCH 08/11] fsmc/nand: Use relaxed variants of io accessors Vipin Kumar
2012-10-09 17:42 ` viresh kumar
2012-10-10 17:09 ` Linus Walleij
2012-10-09 10:44 ` [PATCH 09/11] fsmc/nand:FIX: replace change_bit routine Vipin Kumar
2012-10-10 17:22 ` Linus Walleij
2012-10-10 20:21 ` Nicolas Pitre
2012-10-11 4:17 ` Vipin Kumar
2012-10-10 20:45 ` Russell King - ARM Linux
2012-10-11 4:20 ` Vipin Kumar
2012-10-09 10:44 ` [PATCH 10/11] fsmc/nand: Add sw bch support for ecc calculation/correction Vipin Kumar
2012-10-09 11:50 ` Jean-Christophe PLAGNIOL-VILLARD
2012-10-10 10:33 ` Vipin Kumar
2012-10-09 10:44 ` [PATCH 11/11] nand: Increase the ecc placement locations to 640 Vipin Kumar
2012-10-17 12:47 ` Artem Bityutskiy
2012-10-18 6:36 ` Brian Norris
2012-10-17 12:48 ` [PATCH 00/11] mtd/nand: fsmc driver updates Artem Bityutskiy
2012-10-18 4:13 ` Vipin Kumar
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