diff options
| author | Martin Povišer <povik+lin@cutebit.org> | 2022-09-18 12:58:45 +0300 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2022-09-29 19:13:25 +0300 |
| commit | 6aed75d7ccb3288029287c50fc594a4314698be0 (patch) | |
| tree | a3995573d1d6a090b9972d1d4e4ec4501ad53efa /drivers/dma/apple-admac.c | |
| parent | 072431595a57bc6605c29724afce5f9ef8114915 (diff) | |
| download | linux-6aed75d7ccb3288029287c50fc594a4314698be0.tar.xz | |
dmaengine: apple-admac: Trigger shared reset
If a reset domain is attached to the device, obtain a shared reference
to it and trigger it. Typically on a chip the ADMAC controller will
share a reset domain with the MCA peripheral.
Signed-off-by: Martin Povišer <povik+lin@cutebit.org>
Link: https://lore.kernel.org/r/20220918095845.68860-5-povik+lin@cutebit.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/apple-admac.c')
| -rw-r--r-- | drivers/dma/apple-admac.c | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/drivers/dma/apple-admac.c b/drivers/dma/apple-admac.c index 7d1b76678032..317ca76ccafd 100644 --- a/drivers/dma/apple-admac.c +++ b/drivers/dma/apple-admac.c @@ -12,8 +12,9 @@ #include <linux/module.h> #include <linux/of_device.h> #include <linux/of_dma.h> -#include <linux/interrupt.h> +#include <linux/reset.h> #include <linux/spinlock.h> +#include <linux/interrupt.h> #include "dmaengine.h" @@ -95,6 +96,7 @@ struct admac_data { struct dma_device dma; struct device *dev; __iomem void *base; + struct reset_control *rstc; int irq; int irq_index; @@ -732,6 +734,10 @@ static int admac_probe(struct platform_device *pdev) return dev_err_probe(&pdev->dev, PTR_ERR(ad->base), "unable to obtain MMIO resource\n"); + ad->rstc = devm_reset_control_get_optional_shared(&pdev->dev, NULL); + if (IS_ERR(ad->rstc)) + return PTR_ERR(ad->rstc); + dma = &ad->dma; dma_cap_set(DMA_PRIVATE, dma->cap_mask); @@ -770,10 +776,17 @@ static int admac_probe(struct platform_device *pdev) tasklet_setup(&adchan->tasklet, admac_chan_tasklet); } - err = request_irq(irq, admac_interrupt, 0, dev_name(&pdev->dev), ad); + err = reset_control_reset(ad->rstc); if (err) return dev_err_probe(&pdev->dev, err, - "unable to register interrupt\n"); + "unable to trigger reset\n"); + + err = request_irq(irq, admac_interrupt, 0, dev_name(&pdev->dev), ad); + if (err) { + dev_err_probe(&pdev->dev, err, + "unable to register interrupt\n"); + goto free_reset; + } err = dma_async_device_register(&ad->dma); if (err) { @@ -792,6 +805,8 @@ static int admac_probe(struct platform_device *pdev) free_irq: free_irq(ad->irq, ad); +free_reset: + reset_control_rearm(ad->rstc); return err; } @@ -802,6 +817,7 @@ static int admac_remove(struct platform_device *pdev) of_dma_controller_free(pdev->dev.of_node); dma_async_device_unregister(&ad->dma); free_irq(ad->irq, ad); + reset_control_rearm(ad->rstc); return 0; } |