@@ -1390,20 +1390,32 @@ static int mmc_omap_probe(struct platform_device *pdev)
res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
if (res)
sig = res->start;
- host->dma_tx = dma_request_slave_channel_compat(mask,
+ host->dma_tx = dma_request_slave_channel_compat_reason(mask,
omap_dma_filter_fn, &sig, &pdev->dev, "tx");
- if (!host->dma_tx)
+ if (IS_ERR(host->dma_tx)) {
+ ret = PTR_ERR(host->dma_tx);
+ if (ret == -EPROBE_DEFER)
+ goto err_free_dma;
+
+ host->dma_tx = NULL;
dev_warn(host->dev, "unable to obtain TX DMA engine channel %u\n",
sig);
+ }
res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
if (res)
sig = res->start;
- host->dma_rx = dma_request_slave_channel_compat(mask,
+ host->dma_rx = dma_request_slave_channel_compat_reason(mask,
omap_dma_filter_fn, &sig, &pdev->dev, "rx");
- if (!host->dma_rx)
+ if (IS_ERR(host->dma_rx)) {
+ ret = PTR_ERR(host->dma_rx);
+ if (ret == -EPROBE_DEFER)
+ goto err_free_dma;
+
+ host->dma_rx = NULL;
dev_warn(host->dev, "unable to obtain RX DMA engine channel %u\n",
sig);
+ }
ret = request_irq(host->irq, mmc_omap_irq, 0, DRIVER_NAME, host);
if (ret)
Switch to use ma_request_slave_channel_compat_reason() to request the DMA channels. Only fall back to pio mode if the error code returned is not -EPROBE_DEFER, otherwise return from the probe with the -EPROBE_DEFER. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> CC: Ulf Hansson <ulf.hansson@linaro.org> CC: Jarkko Nikula <jarkko.nikula@bitmer.com> --- drivers/mmc/host/omap.c | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-)