[PATCH v1] dma: imx-sdma: add support for sdma memory copy

Robin Gong
2014-04-22T10:51:44Z

On Tue, Apr 22, 2014 at 10:28:05AM +0000, Shevchenko, Andriy wrote:
> On Fri, 2014-04-18 at 17:41 +0800, Robin Gong wrote:
> > On Thu, Apr 17, 2014 at 10:24:50AM +0000, Shevchenko, Andriy wrote:
> > > On Thu, 2014-04-17 at 18:01 +0800, Robin Gong wrote:
>
> []
>
> > > > + dev_dbg(sdma->dev, "memcpy: %x->%x, len=%d, channel=%d.\n",
> > >
> > > %pad for dma_addr_t variables.
> > >
> > Yes, %x here is not proper, will be %#llx here to align with others similar
> > code in this file.
>
> Why %#llx? You don't need the specific casting since kernel has special
> specifiers for phys_addr_t and dma_addr_t and their derivatives (see
> Documentation/printk-formats.txt)
>
I think both are ok, why I choose %llx is only for align the code style, you
can find the same code in sdma_prep_dma_cyclic function. below description also
copy from Documentation/printk-formats.txt:

If <type> is dependent on a config option for its size (e.g., sector_t,
blkcnt_t, phys_addr_t, resource_size_t) or is architecture-dependent
for its size (e.g., tcflag_t), use a format specifier of its largest
possible type and explicitly cast to it. Example:

printk("test: sector number/total blocks: %llu/%llu\n",
(unsigned long long)sector, (unsigned long long)blockcount);
> > > > + dev_dbg(sdma->dev, "entry %d: count: %d dma: 0x%08x %s%s\n",
> > > > + i, count, sg_src->dma_address,
> > >
> > > %pad for dma_addr_t.
> > >
> > Accept the idea, same as the above.
>
> Same as above.
>
> --
> Andy Shevchenko <andriy.shevchenko@intel.com>
> Intel Finland Oy
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