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(-)
diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c index 68dd6c79c378..29238d0fbc24 100644 --- a/drivers/mmc/host/omap.c +++ b/drivers/mmc/host/omap.c @@ -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)