Arthur,
At present, we lack a user-space tool to initiate eye monitor
measurements. Additionally, opening a channel for users in user land to
send MP commands seems unsafe.
Kind regards,
Bean
On Tue, 2025-03-04 at 13:46 +0200, Arthur Simchaev wrote:
> Eye monitor measurement functionality was added to the M-PHY v5
> specification. The measurement of the eye monitor signal for the UFS
> device begins when the link enters the hibernate state.
> Hence, allow user-layer applications the capability to send the
> hibern8
> enter command through the BSG framework. For completion, allow the
> sibling functionality of hibern8 exit as well.
>
> Signed-off-by: Arthur Simchaev <arthur.simchaev@xxxxxxxxxxx>
> ---
> drivers/ufs/core/ufshcd.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index 4e1e214fc5a2..546ab557a77c 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -4366,6 +4366,16 @@ int ufshcd_send_bsg_uic_cmd(struct ufs_hba
> *hba, struct uic_command *uic_cmd)
> goto out;
> }
>
> + if (uic_cmd->command == UIC_CMD_DME_HIBER_ENTER) {
> + ret = ufshcd_uic_hibern8_enter(hba);
> + goto out;
> + }
> +
> + if (uic_cmd->command == UIC_CMD_DME_HIBER_EXIT) {
> + ret = ufshcd_uic_hibern8_exit(hba);
> + goto out;
> + }
> +
> mutex_lock(&hba->uic_cmd_mutex);
> ufshcd_add_delay_before_dme_cmd(hba);
>
> --
> 2.34.1
