linux-kernel - [PATCH] ufs: core: bsg: Add hibern8 enter/exit to ufshcd_send_bsg_uic

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Message-Id: <20250304114652.210395-1-arthur.simchaev@sandisk.com>
Date: Tue,  4 Mar 2025 13:46:52 +0200
From: Arthur Simchaev <arthur.simchaev@...disk.com>
To: martin.petersen@...cle.com
Cc: avri.altman@...disk.com,
	Avi.Shchislowski@...disk.com,
	linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	bvanassche@....org,
	Arthur Simchaev <arthur.simchaev@...disk.com>
Subject: [PATCH] ufs: core: bsg: Add hibern8 enter/exit to ufshcd_send_bsg_uic_cmd

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@...disk.com>
---
 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