Messages in this thread | | | Date | Wed, 10 Sep 2014 11:21:05 +0100 | From | Mark Brown <> | Subject | Re: [PATCH v5] spi: spi-imx: add DMA support |
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On Wed, Sep 10, 2014 at 09:30:04AM +0800, Robin Gong wrote:
> +static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi, > + struct spi_transfer *transfer) > +{ > + struct spi_imx_data *spi_imx = spi_master_get_devdata(master); > + > + if (spi_imx->dma_is_inited && (transfer->len > spi_imx->rx_wml) > + && (transfer->len > spi_imx->tx_wml)) > + spi_imx->usedma = true; > + else > + spi_imx->usedma = false; > + > + return spi_imx->usedma; > +}
This isn't going to work, anything that looks at the usedma flag will see the result of the last thing that was checked which may or may not be the transfer that it's handling. The driver should check to see if the core mapped the transfer for DMA. [unhandled content-type:application/pgp-signature] | |