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slimbus: qcom-ngd-ctrl: Use dma_request_chan() instead dma_request_slave_channel()

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dma_request_slave_channel() is a wrapper on top of dma_request_chan()
eating up the error code.

By using dma_request_chan() directly the driver can support deferred
probing against DMA.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200109103148.5612-3-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Ujfalusi 2020-01-09 10:31:46 +00:00 committed by Greg Kroah-Hartman
parent 884a90bdf4
commit 7b73a9c8e2
1 changed files with 12 additions and 8 deletions
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20
drivers/slimbus/qcom-ngd-ctrl.c
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@ -666,10 +666,12 @@ static int qcom_slim_ngd_init_rx_msgq(struct qcom_slim_ngd_ctrl *ctrl)
struct device *dev = ctrl->dev;
int ret, size;
ctrl->dma_rx_channel = dma_request_slave_channel(dev, "rx");
if (!ctrl->dma_rx_channel) {
dev_err(dev, "Failed to request dma channels");
return -EINVAL;
ctrl->dma_rx_channel = dma_request_chan(dev, "rx");
if (IS_ERR(ctrl->dma_rx_channel)) {
dev_err(dev, "Failed to request RX dma channel");
ret = PTR_ERR(ctrl->dma_rx_channel);
ctrl->dma_rx_channel = NULL;
return ret;
}
size = QCOM_SLIM_NGD_DESC_NUM * SLIM_MSGQ_BUF_LEN;
@ -703,10 +705,12 @@ static int qcom_slim_ngd_init_tx_msgq(struct qcom_slim_ngd_ctrl *ctrl)
int ret = 0;
int size;
ctrl->dma_tx_channel = dma_request_slave_channel(dev, "tx");
if (!ctrl->dma_tx_channel) {
dev_err(dev, "Failed to request dma channels");
return -EINVAL;
ctrl->dma_tx_channel = dma_request_chan(dev, "tx");
if (IS_ERR(ctrl->dma_tx_channel)) {
dev_err(dev, "Failed to request TX dma channel");
ret = PTR_ERR(ctrl->dma_tx_channel);
ctrl->dma_tx_channel = NULL;
return ret;
}
size = ((QCOM_SLIM_NGD_DESC_NUM + 1) * SLIM_MSGQ_BUF_LEN);