On 15-09-18, 01:34, Sasha Levin wrote:
> From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
>
> [ Upstream commit 2abc66cd499aa16876e45c6438788902f7d1ce22 ]
>
> It appears that the driver misses the support of dmaengine_terminate_sync().
> Since many of callers expects this behaviour implement the new
> device_synchronize() callback to allow proper synchronization when stopping
> a channel.
This adds missing support for an optional call, but I am not aware of
any reports of breakage due to missing this patch. Do you want to carry
this for stable?
> Fixes: b36f09c3c441 ("dmaengine: Add transfer termination synchronization support")
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
> Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
> ---
> drivers/dma/hsu/hsu.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/dma/hsu/hsu.c b/drivers/dma/hsu/hsu.c
> index 29d04ca71d52..202ffa9f7611 100644
> --- a/drivers/dma/hsu/hsu.c
> +++ b/drivers/dma/hsu/hsu.c
> @@ -413,6 +413,13 @@ static void hsu_dma_free_chan_resources(struct dma_chan *chan)
> vchan_free_chan_resources(to_virt_chan(chan));
> }
>
> +static void hsu_dma_synchronize(struct dma_chan *chan)
> +{
> + struct hsu_dma_chan *hsuc = to_hsu_dma_chan(chan);
> +
> + vchan_synchronize(&hsuc->vchan);
> +}
> +
> int hsu_dma_probe(struct hsu_dma_chip *chip)
> {
> struct hsu_dma *hsu;
> @@ -459,6 +466,7 @@ int hsu_dma_probe(struct hsu_dma_chip *chip)
> hsu->dma.device_pause = hsu_dma_pause;
> hsu->dma.device_resume = hsu_dma_resume;
> hsu->dma.device_terminate_all = hsu_dma_terminate_all;
> + hsu->dma.device_synchronize = hsu_dma_synchronize;
>
> hsu->dma.src_addr_widths = HSU_DMA_BUSWIDTHS;
> hsu->dma.dst_addr_widths = HSU_DMA_BUSWIDTHS;
> --
> 2.17.1
--
~Vinod
