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HID: intel-ish-hid: ipc: Specify that EHL no cache snooping

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Specify that EHL doesn't support DMA cache snooping.

Acked-by: Pandruvada, Srinivas <srinivas.pandruvada@intel.com>
Signed-off-by: Even Xu <even.xu@intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Even Xu 2021-06-10 14:21:54 +08:00 committed by Jiri Kosina
parent 4aae88b9a9
commit aa59d6bb5e
1 changed files with 25 additions and 1 deletions
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26
drivers/hid/intel-ish-hid/ipc/ipc.c
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@ -889,6 +889,29 @@ static uint32_t ish_ipc_get_header(struct ishtp_device *dev, int length,
return drbl_val;
}
/**
* _dma_no_cache_snooping()
*
* Check on current platform, DMA supports cache snooping or not.
* This callback is used to notify uplayer driver if manully cache
* flush is needed when do DMA operation.
*
* Please pay attention to this callback implementation, if declare
* having cache snooping on a cache snooping not supported platform
* will cause uplayer driver receiving mismatched data; and if
* declare no cache snooping on a cache snooping supported platform
* will cause cache be flushed twice and performance hit.
*
* @dev: ishtp device pointer
*
* Return: false - has cache snooping capability
* true - no cache snooping, need manually cache flush
*/
static bool _dma_no_cache_snooping(struct ishtp_device *dev)
{
return dev->pdev->device == EHL_Ax_DEVICE_ID;
}
static const struct ishtp_hw_ops ish_hw_ops = {
.hw_reset = _ish_hw_reset,
.ipc_reset = _ish_ipc_reset,
@ -897,7 +920,8 @@ static const struct ishtp_hw_ops ish_hw_ops = {
.write = write_ipc_to_queue,
.get_fw_status = _ish_read_fw_sts_reg,
.sync_fw_clock = _ish_sync_fw_clock,
.ishtp_read_hdr = _ishtp_read_hdr
.ishtp_read_hdr = _ishtp_read_hdr,
.dma_no_cache_snooping = _dma_no_cache_snooping
};
/**