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dmaengine: PL08x: remove runtime PM support

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The runtime PM support conflicts with the generic AMBA bus PM, and also
causes a potential deadlock with the PL011 driver as it results in
interrupts being enabled beneath a spinlock.

I don't presently see any solution to this other than by removing the
runtime PM support entirely from the DMA engine driver.  Alternative
suggestions welcome.

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2012-05-17 18:23:38 +01:00
parent 571fa74034
commit b843441a4c
1 changed files with 0 additions and 10 deletions
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10
drivers/dma/amba-pl08x.c
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@ -404,7 +404,6 @@ pl08x_get_phy_channel(struct pl08x_driver_data *pl08x,
return NULL;
}
pm_runtime_get_sync(&pl08x->adev->dev);
return ch;
}
@ -418,8 +417,6 @@ static inline void pl08x_put_phy_channel(struct pl08x_driver_data *pl08x,
/* Stop the channel and clear its interrupts */
pl08x_terminate_phy_chan(pl08x, ch);
pm_runtime_put(&pl08x->adev->dev);
/* Mark it as free */
ch->serving = NULL;
spin_unlock_irqrestore(&ch->lock, flags);
@ -1851,9 +1848,6 @@ static int pl08x_probe(struct amba_device *adev, const struct amba_id *id)
goto out_no_pl08x;
}
pm_runtime_set_active(&adev->dev);
pm_runtime_enable(&adev->dev);
/* Initialize memcpy engine */
dma_cap_set(DMA_MEMCPY, pl08x->memcpy.cap_mask);
pl08x->memcpy.dev = &adev->dev;
@ -2007,7 +2001,6 @@ static int pl08x_probe(struct amba_device *adev, const struct amba_id *id)
amba_part(adev), amba_rev(adev),
(unsigned long long)adev->res.start, adev->irq[0]);
pm_runtime_put(&adev->dev);
return 0;
out_no_slave_reg:
@ -2026,9 +2019,6 @@ out_no_ioremap:
dma_pool_destroy(pl08x->pool);
out_no_lli_pool:
out_no_platdata:
pm_runtime_put(&adev->dev);
pm_runtime_disable(&adev->dev);
kfree(pl08x);
out_no_pl08x:
amba_release_regions(adev);