# Re: \[PATCH\] HID: intel-ish-hid: ipc: Specify no cache snooping on TGL and ADL

- From: srinivas pandruvada \<srinivas.pandruvada@linux.intel.com\>
- Date: 2021-12-17 12:33:10 
- List: linux-input
- Page: https://ratatoskr.run/linux-input/2021/12/1612269
- Thread: https://ratatoskr.run/linux-input/2021/12/1611947/t.md

```text
On Fri, 2021-12-17 at 15:45 +0800, Ye Xiang wrote:
> Specify that both TGL and ADL don't support DMA cache snooping.
> 
> Signed-off-by: Ye Xiang <redacted>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>

> ---
>  drivers/hid/intel-ish-hid/ipc/ipc.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/hid/intel-ish-hid/ipc/ipc.c b/drivers/hid/intel-
> ish-hid/ipc/ipc.c
> index 45e0c7b1c9ec..8ccb246b0114 100644
> --- a/drivers/hid/intel-ish-hid/ipc/ipc.c
> +++ b/drivers/hid/intel-ish-hid/ipc/ipc.c
> @@ -909,7 +909,11 @@ static uint32_t ish_ipc_get_header(struct
> ishtp_device *dev, int length,
>   */
>  static bool _dma_no_cache_snooping(struct ishtp_device *dev)
>  {
> -       return dev->pdev->device == EHL_Ax_DEVICE_ID;
> +       return (dev->pdev->device == EHL_Ax_DEVICE_ID ||
> +               dev->pdev->device == TGL_LP_DEVICE_ID ||
> +               dev->pdev->device == TGL_H_DEVICE_ID ||
> +               dev->pdev->device == ADL_S_DEVICE_ID ||
> +               dev->pdev->device == ADL_P_DEVICE_ID);
>  }
>  
>  static const struct ishtp_hw_ops ish_hw_ops = {


```