On Sunday, June 22, 2014 at 01:58:08 PM, Corentin LABBE wrote:
[...]
> >> + * This program is free software; you can redistribute it and/or modify
> >> + * it under the terms of the GNU General Public License as published by
> >> + * the Free Software Foundation version 2 of the License
> >
> > The license text seems incomplete.
> > [...]
>
> I will replace it with a simplier line "Licensed under the GPL-2."
I'd suggest you to use the SPDX license identifiers then, but that's not
something the kernel crowd agreed upon yet IIRC.Therefore , just make the text
complete please.
[...]
> >> + src_addr = kmap(sg_page(in_sg)) + in_sg->offset;
> >> + if (src_addr == NULL) {
> >> + dev_err(ss->dev, "KMAP error for src SG\n");
> >> + return -1;
> >> + }
> >
> > Why can't you just use dma_map_sg() or somesuch ?
>
> I do not see why I will use a DMA function in a driver without DMA support.
> Perhaps I do not know some tricks.
> Can I use writel/readl on address gived by DMA API ?
Oh, ok, good question -- dear list, shall one use sg_page()+kmap or sg_virt()?
btw. I just noticed you're just feeding the hardware FIFO in a loop with data in
the scatterlists, do I understand it correctly ? The driver will consume quite a
lot of CPU time to do that, can you not implement DMA here ?
[...]
Best regards,
Marek Vasut
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