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dmaengine: apple-admac: Avoid accessing registers in probe

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commit 8d55e8a16f upstream.

The ADMAC attached to the AOP has complex power sequencing, and is
power gated when the probe callback runs. Move the register reads
to other functions, where we can guarantee that the hardware is
switched on.

Fixes: 568aa6dd64 ("dmaengine: apple-admac: Allocate cache SRAM to channels")
Signed-off-by: Sasha Finkelstein <fnkl.kernel@gmail.com>
Link: https://lore.kernel.org/r/20241124-admac-power-v1-1-58f2165a4d55@gmail.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sasha Finkelstein
2024-11-24 16:48:28 +01:00
committed by Greg Kroah-Hartman
parent f5d2315924
commit ed31336f81
1 changed files with 2 additions and 5 deletions
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drivers/dma/apple-admac.c
+2 -5
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@@ -153,6 +153,8 @@ static int admac_alloc_sram_carveout(struct admac_data *ad,
{
struct admac_sram *sram;
int i, ret = 0, nblocks;
ad->txcache.size = readl_relaxed(ad->base + REG_TX_SRAM_SIZE);
ad->rxcache.size = readl_relaxed(ad->base + REG_RX_SRAM_SIZE);
if (dir == DMA_MEM_TO_DEV)
sram = &ad->txcache;
@@ -912,12 +914,7 @@ static int admac_probe(struct platform_device *pdev)
goto free_irq;
}
ad->txcache.size = readl_relaxed(ad->base + REG_TX_SRAM_SIZE);
ad->rxcache.size = readl_relaxed(ad->base + REG_RX_SRAM_SIZE);
dev_info(&pdev->dev, "Audio DMA Controller\n");
dev_info(&pdev->dev, "imprint %x TX cache %u RX cache %u\n",
readl_relaxed(ad->base + REG_IMPRINT), ad->txcache.size, ad->rxcache.size);
return 0;