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spi/amba-pl022: work in polling or interrupt mode if pl022_dma_probe fails 

If pl022_dma_probe fails, we can try to transfer data in polling or interrupt
mode. Also, set platform_info->enable_dma to 0, so that no other code tries to
use dma.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Viresh Kumar 2011-05-16 09:40:10 +05:30 committed by Grant Likely
parent c6e7b8cb11
commit 43c640157d
1 changed files with 6 additions and 5 deletions
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11
drivers/spi/amba-pl022.c
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@ -1060,7 +1060,7 @@ static int __init pl022_dma_probe(struct pl022 *pl022)
pl022->master_info->dma_filter,
pl022->master_info->dma_rx_param);
if (!pl022->dma_rx_channel) {
dev_err(&pl022->adev->dev, "no RX DMA channel!\n");
dev_dbg(&pl022->adev->dev, "no RX DMA channel!\n");
goto err_no_rxchan;
}
@ -1068,13 +1068,13 @@ static int __init pl022_dma_probe(struct pl022 *pl022)
pl022->master_info->dma_filter,
pl022->master_info->dma_tx_param);
if (!pl022->dma_tx_channel) {
dev_err(&pl022->adev->dev, "no TX DMA channel!\n");
dev_dbg(&pl022->adev->dev, "no TX DMA channel!\n");
goto err_no_txchan;
}
pl022->dummypage = kmalloc(PAGE_SIZE, GFP_KERNEL);
if (!pl022->dummypage) {
dev_err(&pl022->adev->dev, "no DMA dummypage!\n");
dev_dbg(&pl022->adev->dev, "no DMA dummypage!\n");
goto err_no_dummypage;
}
@ -1090,6 +1090,8 @@ err_no_txchan:
dma_release_channel(pl022->dma_rx_channel);
pl022->dma_rx_channel = NULL;
err_no_rxchan:
dev_err(&pl022->adev->dev,
"Failed to work in dma mode, work without dma!\n");
return -ENODEV;
}
@ -2115,7 +2117,7 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id)
if (platform_info->enable_dma) {
status = pl022_dma_probe(pl022);
if (status != 0)
goto err_no_dma;
platform_info->enable_dma = 0;
}
/* Initialize and start queue */
@ -2151,7 +2153,6 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id)
err_init_queue:
destroy_queue(pl022);
pl022_dma_remove(pl022);
err_no_dma:
free_irq(adev->irq[0], pl022);
err_no_irq:
clk_put(pl022->clk);