Re: [PATCH v4] dmaengine: sh: rz-dmac: Add device_synchronize callback

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On Fri, Jul 22, 2022 at 10:44 AM Biju Das <biju.das.jz@xxxxxxxxxxxxxx> wrote:
> Some on-chip peripheral modules(for eg:- rspi) on RZ/G2L SoC
> use the same signal for both interrupt and DMA transfer requests.
> The signal works as a DMA transfer request signal by setting
> DMARS, and subsequent interrupt requests to the interrupt controller
> are masked.
>
> We can re-enable the interrupt by clearing the DMARS.
>
> This patch adds device_synchronize callback for clearing
> DMARS and thereby allowing DMA consumers to switch to
> interrupt mode.
>
> Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
> ---
> v3->v4:
>  * Increased delay_us 10->100us and timeout_us 1ms->100ms.

Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>

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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