serial: 8250: Validate dmaengine tx chan meets requirements
8250 dma support requires the dmaegine driver support terminate. Query slave caps to determine if necessary commands/properties are supported; disable dma if not. Note this means dmaengine driver must support slave caps reporting as well. Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -201,6 +201,15 @@ int serial8250_request_dma(struct uart_8250_port *p)
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goto release_rx;
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}
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/* 8250 tx dma requires dmaengine driver to support terminate */
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ret = dma_get_slave_caps(dma->txchan, &caps);
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if (ret)
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goto err;
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if (!caps.cmd_terminate) {
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ret = -EINVAL;
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goto err;
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}
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dmaengine_slave_config(dma->txchan, &dma->txconf);
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/* RX buffer */
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