linux-kernel - [PATCH v4 2/4] scsi: ufs: Allow WriteBooster on UFS 2.2 devices

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Date:   Fri, 22 May 2020 16:32:10 +0800
From:   Stanley Chu <stanley.chu@...iatek.com>
To:     <linux-scsi@...r.kernel.org>, <martin.petersen@...cle.com>,
        <avri.altman@....com>, <alim.akhtar@...sung.com>,
        <jejb@...ux.ibm.com>, <asutoshd@...eaurora.org>
CC:     <beanhuo@...ron.com>, <cang@...eaurora.org>,
        <matthias.bgg@...il.com>, <bvanassche@....org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <Virtual_Global_UFS_Upstream@...iatek.com>,
        Stanley Chu <stanley.chu@...iatek.com>
Subject: [PATCH v4 2/4] scsi: ufs: Allow WriteBooster on UFS 2.2 devices

According to the UFS specification, WriteBooster is officially
supported by UFS 2.2.

Since UFS 2.2 specification has been finalized in JEDEC and
such devices have also showed up in the market, modify the
checking rule for ufshcd_wb_probe() to allow these devices to enable
WriteBooster.

Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>
Reviewed-by: Avri Altman <avri.altman@....com>
---
 drivers/scsi/ufs/ufshcd.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 9e55c524f330..0dbd8a7a6642 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -6930,6 +6930,7 @@ static int ufs_get_device_desc(struct ufs_hba *hba)
 	 * UFS_DEVICE_QUIRK_SUPPORT_EXTENDED_FEATURES enabled
 	 */
 	if (dev_info->wspecversion >= 0x310 ||
+	    dev_info->wspecversion == 0x220 ||
 	    (hba->dev_quirks & UFS_DEVICE_QUIRK_SUPPORT_EXTENDED_FEATURES))
 		ufshcd_wb_probe(hba, desc_buf);
 
-- 
2.18.0