On 11-07-18, 00:23, Robin Gong wrote:
> dmatest(memcpy) will never call dmaengine_slave_config before prep,
and that should have been a hint to you that you should not expect that
> so jobs in dmaengine_slave_config need to be moved into somewhere
> before device_prep_dma_memcpy. Besides, dmatest never setup chan
> ->private as other common case like uart/audio/spi will always setup
> chan->private. Here check it to judge if it's dmatest case and do
> jobs in slave_config.
and you should not do anything for dmatest. Supporting it means memcpy
implementation is not correct :)
>
> Signed-off-by: Robin Gong <yibin.gong@xxxxxxx>
> ---
> drivers/dma/imx-sdma.c | 37 ++++++++++++++++++++++++++++---------
> 1 file changed, 28 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
> index ed2267d..48f3749 100644
> --- a/drivers/dma/imx-sdma.c
> +++ b/drivers/dma/imx-sdma.c
> @@ -1222,10 +1222,36 @@ static int sdma_alloc_chan_resources(struct dma_chan *chan)
> {
> struct sdma_channel *sdmac = to_sdma_chan(chan);
> struct imx_dma_data *data = chan->private;
> + struct imx_dma_data default_data;
> int prio, ret;
>
> - if (!data)
> - return -EINVAL;
> + ret = clk_enable(sdmac->sdma->clk_ipg);
> + if (ret)
> + return ret;
> + ret = clk_enable(sdmac->sdma->clk_ahb);
> + if (ret)
> + goto disable_clk_ipg;
> + /*
> + * dmatest(memcpy) will never call dmaengine_slave_config before prep,
> + * so jobs in dmaengine_slave_config need to be moved into somewhere
> + * before device_prep_dma_memcpy. Besides, dmatest never setup chan
> + * ->private as other common cases like uart/audio/spi will setup
> + * chan->private always. Here check it to judge if it's dmatest case
> + * and do jobs in slave_config.
> + */
> + if (!data) {
> + dev_warn(sdmac->sdma->dev, "dmatest is running?\n");
why is that a warning!
> + sdmac->word_size = sdmac->sdma->dma_device.copy_align;
> + default_data.priority = 2;
> + default_data.peripheral_type = IMX_DMATYPE_MEMORY;
> + default_data.dma_request = 0;
> + default_data.dma_request2 = 0;
> + data = &default_data;
> +
> + sdma_config_ownership(sdmac, false, true, false);
> + sdma_get_pc(sdmac, IMX_DMATYPE_MEMORY);
> + sdma_load_context(sdmac);
> + }
this needs to be default for memcpy
--
~Vinod
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