Re: [PATCH v4 0/4] serial: sh-sci: Fix fallback to PIO on DMA failure

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Hi Rob,

On Sun, Dec 16, 2018 at 3:22 AM Rob Landley <rob@xxxxxxxxxxx> wrote:
> On 12/13/18 12:44 PM, Geert Uytterhoeven wrote:
> > When submitting a DMA request fails, the sh-sci driver is supposed to
> > fall back to PIO.  However, this never really worked due to various
> > reasons (sh-sci driver issues and dmaengine framework limitations).
>
> Is it possible to test this under qemu-system-sh4? (Does that emulate the DMA
> controller?)

No, the sh-sci emulation in QEMU is very limited, and does not include DMA.

My patch series does not affect PIO mode, only errors paths in DMA code.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds



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