Hi Morimoto-san,
Thank you for the patch.
On Monday, 2 July 2018 04:07:17 EEST Kuninori Morimoto wrote:
> From: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
>
> We need to clear channel register in error case as recovery.
> The channel is already stopped in such case, thus we don't need to call
> rcar_dmac_chan_halt() before clearing.
>
> rcar_dmac_chan_halt() will clear register and confirm DE bit.
> But it will be failed because channel is already stopped in error case.
> In other words, we shouldn't call it then.
>
> // This patch started to use C++ style comment out
> // because it is recent Linus request
I fear this will generate lots of frustration :-/ While I strongly prefer the
traditional C style, I'm fine leaving the choice to driver authors. However, I
think that mixing different styles in the same file only hinders readability.
Would you like to convert the whole file ? ;-)
> Reported-by: Hiroki Negishi <hiroki.negishi.bx@xxxxxxxxxxx>
> Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
> Reviewed-by: Hiroki Negishi <hiroki.negishi.bx@xxxxxxxxxxx>
> ---
> drivers/dma/sh/rcar-dmac.c | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/dma/sh/rcar-dmac.c b/drivers/dma/sh/rcar-dmac.c
> index 279c930..35d7a16 100644
> --- a/drivers/dma/sh/rcar-dmac.c
> +++ b/drivers/dma/sh/rcar-dmac.c
> @@ -1525,7 +1525,13 @@ static irqreturn_t rcar_dmac_isr_channel(int irq,
> void *dev)
>
> chcr = rcar_dmac_chan_read(chan, RCAR_DMACHCR);
> if (chcr & RCAR_DMACHCR_CAE) {
> - rcar_dmac_chan_halt(chan);
> + struct rcar_dmac *dmac = dev_get_drvdata(chan->chan.device->dev);
This could be simplified with
struct rcar_dmac *dmac = to_rcar_dmac(chan->chan.device);
> +
> + // We don't need to call rcar_dmac_chan_halt()
> + // because channel is already stopped in error case.
> + // We need to clear register and check DE bit as recovery.
Is it also a request from Linus to wrap text much before the 80 characters
limit ? :-)
> + rcar_dmac_write(dmac, RCAR_DMACHCLR, 1 << chan->index);
> + rcar_dmac_chcr_de_barrier(chan);
> reinit = true;
> goto spin_lock_end;
> }
--
Regards,
Laurent Pinchart
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