linux-kernel - RE: [PATCH v36 4/4] scsi: ufs: Add HPB 2.0 support

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Date:   Thu, 10 Jun 2021 01:55:24 +0000
From:   정요한(JOUNG YOHAN) Mobile SE 
        <yohan.joung@...com>
To:     "daejun7.park@...sung.com" <daejun7.park@...sung.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        "avri.altman@....com" <avri.altman@....com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "bvanassche@....org" <bvanassche@....org>,
        "huobean@...il.com" <huobean@...il.com>,
        ALIM AKHTAR <alim.akhtar@...sung.com>
CC:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v36 4/4] scsi: ufs: Add HPB 2.0 support

diff --git a/drivers/scsi/ufs/ufshpb.h b/drivers/scsi/ufs/ufshpb.h index 6e6a0252dc15..b1128b0ce486 100644
--- a/drivers/scsi/ufs/ufshpb.h
+++ b/drivers/scsi/ufs/ufshpb.h
@@ -30,19 +30,29 @@
 #define PINNED_NOT_SET				U32_MAX
 
 /* hpb support chunk size */
-#define HPB_MULTI_CHUNK_HIGH			1
+#define HPB_LEGACY_CHUNK_HIGH			1
+#define HPB_MULTI_CHUNK_LOW			7
+#define HPB_MULTI_CHUNK_HIGH			128
 
According to the JEDEC spec, bMAX_ DATA_SIZE_FOR_HPB_SINGLE_CMD can be set from 4kb to 1024kb. 
The transfer length should be provided up to 1020kb or 1024kb.
Why did you set HPB_MULTI_CHUNK_HIGH to 128? 
It can sends the hpb command up to 512kb. 
This doesn't seem to match the specs.

Thanks
Yohan.