[PATCH 1/3] DMA: PL330: Infer transfer direction from transfer request instead of platform data

[Boojin Kim]

Thomas Abraham wrote:
> Sent: Wednesday, August 24, 2011 12:23 PM
> To: Boojin Kim
> Cc: linux-arm-kernel at lists.infradead.org; linux-samsung-
> soc at vger.kernel.org; kgene.kim at samsung.com; vinod.koul at intel.com;
> Jassi Brar
> Subject: Re: [PATCH 1/3] DMA: PL330: Infer transfer direction from
> transfer request instead of platform data
>
> Hi Boojin,
>
> On 24 August 2011 06:51, Boojin Kim <boojin.kim at samsung.com> wrote:
> > Thomas Abraham wrote:
> >> Sent: Tuesday, August 23, 2011 7:00 AM
> >> To: linux-arm-kernel at lists.infradead.org
> >> Cc: linux-samsung-soc at vger.kernel.org; kgene.kim at samsung.com;
> >> vinod.koul at intel.com; Jassi Brar; Boojin Kim
> >> Subject: [PATCH 1/3] DMA: PL330: Infer transfer direction from
> >> transfer request instead of platform data
> >>
> >> The transfer direction for a channel can be inferred from the
> transfer
> >> request and the need for specifying transfer direction in platfrom
> >> data
> >> can be eliminated. So the structure definition 'struct
> dma_pl330_peri'
> >> is no longer required.
> >>
> >> With the 'struct dma_pl330_peri' removed, the dma controller
> transfer
> >> capabilities cannot be inferred any longer. Hence, the dma
> controller
> >> capabilities is specified using platforme data.
> >>
> >> Cc: Jassi Brar <jassisinghbrar at gmail.com>
> >> Cc: Boojin Kim <boojin.kim at samsung.com>
> >> Signed-off-by: Thomas Abraham <thomas.abraham at linaro.org>
> >> ---
> >>  drivers/dma/pl330.c        |   56 ++++++++--------------------------
> ----
> >> ------
> >>  include/linux/amba/pl330.h |   14 +++--------
> >>  2 files changed, 14 insertions(+), 56 deletions(-)
> >>
>
> [...]
>
> >>       for (i = 0; i < num_chan; i++) {
> >>               pch = &pdmac->peripherals[i];
> >> -             if (pdat) {
> >> -                     struct dma_pl330_peri *peri = &pdat->peri[i];
> >> -
> >> -                     switch (peri->rqtype) {
> >> -                     case MEMTOMEM:
> >> -                             dma_cap_set(DMA_MEMCPY, pd->cap_mask);
> >> -                             break;
> >> -                     case MEMTODEV:
> >> -                     case DEVTOMEM:
> >> -                             dma_cap_set(DMA_SLAVE, pd->cap_mask);
> >> -                             dma_cap_set(DMA_CYCLIC, pd->cap_mask);
> >> -                             break;
> > If remove capabilities setting, dmaengine() doesn't search the
> channel that
> > client requests with specific capability.
> > So, I think dma_request_channel() would fail.
>
> The capabilities is now supplied using platform data. There is a new
> member 'cap_mask' added to the pl330 driver platform data structure.
> The capabilities for a pl330 controller can be specified using
> cap_mask. For exynos4, the capabilities is set up in the
> exynos4_dma_init function. These changes are part of the third patch
> in this patchset.
>
> Thanks for your review.
>
> Regards,
> Thomas.
Okay, It's good to me.
Thanks,
Boojin

>
> [...]
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