linux-kernel - [<RFC PATCH v1> 2/2] ufs-qcom: scsi: configure write booster type

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Date:   Fri, 21 Feb 2020 16:47:21 -0800
From:   Asutosh Das <asutoshd@...eaurora.org>
To:     subhashj@...eaurora.org, cang@...eaurora.org,
        rnayak@...eaurora.org, vinholikatti@...il.com,
        jejb@...ux.vnet.ibm.com, martin.petersen@...cle.com,
        linux-scsi@...r.kernel.org
Cc:     Asutosh Das <asutoshd@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [<RFC PATCH v1> 2/2] ufs-qcom: scsi: configure write booster type

Configure the WriteBooster type to preserve user-space mode.
This would ensure that no user-space capacity is reduced
when write booster is enabled.

Signed-off-by: Asutosh Das <asutoshd@...eaurora.org>
---
 drivers/scsi/ufs/ufs-qcom.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
index 8339050..313b4a2 100644
--- a/drivers/scsi/ufs/ufs-qcom.c
+++ b/drivers/scsi/ufs/ufs-qcom.c
@@ -1686,6 +1686,12 @@ static void ufs_qcom_device_reset(struct ufs_hba *hba)
 	usleep_range(10, 15);
 }
 
+static u32 ufs_qcom_get_user_cap_mode(struct ufs_hba *hba)
+{
+	/* QCom prefers no user-space reduction mode */
+	return UFS_WB_BUFF_PRESERVE_USER_SPACE;
+}
+
 /**
  * struct ufs_hba_qcom_vops - UFS QCOM specific variant operations
  *
@@ -1707,6 +1713,7 @@ static const struct ufs_hba_variant_ops ufs_hba_qcom_vops = {
 	.resume			= ufs_qcom_resume,
 	.dbg_register_dump	= ufs_qcom_dump_dbg_regs,
 	.device_reset		= ufs_qcom_device_reset,
+	.get_user_cap_mode	= ufs_qcom_get_user_cap_mode,
 };
 
 /**
-- 
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