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HID: Intel-thc-hid: Intel-thc: Add API to reset read DMA

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Add a helper function thc_rxdma_reset() to do read DMA reset, it can be
called when fatal DMA error happens.

Signed-off-by: Even Xu <even.xu@intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
This commit is contained in:
Even Xu 2026-07-29 13:01:43 +08:00 committed by Jiri Kosina
parent 447c7737ab
commit 1d46b8d406
2 changed files with 52 additions and 0 deletions
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51
drivers/hid/intel-thc-hid/intel-thc/intel-thc-dma.c
View File

@ -561,6 +561,57 @@ static int thc_wait_for_dma_pause(struct thc_device *dev, enum thc_dma_channel c
return 0;
}
/**
* thc_rxdma_reset - Reset all read DMA engines
*
* @dev: The pointer of THC private device context
*
* This is a helper function to reset RxDMA configure. It's typically used
* for RxDMA recovery when fatal error happens.
*
* Return: 0 if successful or error code on failure.
*/
int thc_rxdma_reset(struct thc_device *dev)
{
int ret;
if (mutex_lock_interruptible(&dev->thc_bus_lock))
return -EINTR;
ret = thc_interrupt_quiesce(dev, true);
if (ret) {
dev_err(dev->dev, "Quiesce interrupt failed during RxDMA reset\n");
goto end;
}
ret = thc_wait_for_dma_pause(dev, THC_RXDMA1);
if (ret) {
dev_err(dev->dev, "Wait for RxDMA1 pause failed during RxDMA reset\n");
goto end;
}
ret = thc_wait_for_dma_pause(dev, THC_RXDMA2);
if (ret) {
dev_err(dev->dev, "Wait for RxDMA2 pause failed during RxDMA reset\n");
goto end;
}
thc_dma_unconfigure(dev);
ret = thc_dma_configure(dev);
if (ret) {
dev_err(dev->dev, "Re-config DMA failed during RxDMA reset\n");
goto end;
}
thc_interrupt_quiesce(dev, false);
end:
mutex_unlock(&dev->thc_bus_lock);
return ret;
}
EXPORT_SYMBOL_NS_GPL(thc_rxdma_reset, "INTEL_THC");
static int read_dma_buffer(struct thc_device *dev,
struct thc_dma_configuration *read_config,
u8 prd_table_index, void *read_buff)

1
drivers/hid/intel-thc-hid/intel-thc/intel-thc-dma.h
View File

@ -145,6 +145,7 @@ int thc_dma_allocate(struct thc_device *dev);
int thc_dma_configure(struct thc_device *dev);
void thc_dma_unconfigure(struct thc_device *dev);
void thc_dma_release(struct thc_device *dev);
int thc_rxdma_reset(struct thc_device *dev);
int thc_rxdma_read(struct thc_device *dev, enum thc_dma_channel dma_channel,
void *read_buff, size_t *read_len, int *read_finished);
int thc_swdma_read(struct thc_device *dev, void *write_buff, size_t write_len,