linux-kernel - [PATCH v5 2/3] scsi: ufs: Allow platform vendors to set rtt

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Date: Thu, 23 May 2024 15:58:25 +0300
From: Avri Altman <avri.altman@....com>
To: "Martin K . Petersen" <martin.petersen@...cle.com>
Cc: Bart Van Assche <bvanassche@....org>,
	Bean Huo <beanhuo@...ron.com>,
	Peter Wang <peter.wang@...iatek.com>,
	linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Avri Altman <avri.altman@....com>
Subject: [PATCH v5 2/3] scsi: ufs: Allow platform vendors to set rtt

Allow platform vendors to take precedence having their own rtt
negotiation mechanism.  This makes sense because the host controller's
nortt characteristic may vary among vendors.

Signed-off-by: Avri Altman <avri.altman@....com>
---
 drivers/ufs/core/ufshcd.c | 5 ++++-
 include/ufs/ufshcd.h      | 2 ++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 7df8bcacbe7e..d8e0e80d66a5 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -8542,7 +8542,10 @@ static int ufshcd_device_params_init(struct ufs_hba *hba)
 		goto out;
 	}
 
-	ufshcd_set_rtt(hba);
+	if (hba->vops && hba->vops->set_rtt)
+		hba->vops->set_rtt(hba);
+	else
+		ufshcd_set_rtt(hba);
 
 	ufshcd_get_ref_clk_gating_wait(hba);
 
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index d74bd2d67b06..495b50a72f9f 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -329,6 +329,7 @@ struct ufs_pwr_mode_info {
  * @get_outstanding_cqs: called to get outstanding completion queues
  * @config_esi: called to config Event Specific Interrupt
  * @config_scsi_dev: called to configure SCSI device parameters
+ * @set_rtt: negotiate rtt
  */
 struct ufs_hba_variant_ops {
 	const char *name;
@@ -374,6 +375,7 @@ struct ufs_hba_variant_ops {
 	int	(*get_outstanding_cqs)(struct ufs_hba *hba,
 				       unsigned long *ocqs);
 	int	(*config_esi)(struct ufs_hba *hba);
+	void	(*set_rtt)(struct ufs_hba *hba);
 };
 
 /* clock gating state  */
-- 
2.34.1