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Tue, 7 Jul 2020 06:50:45 +0000 (GMT) From: "Grant Jung" To: "'Kiwoong Kim'" , "'Avri Altman'" , , , , , , , , , , , In-Reply-To: <000801d65425$2ce3ad50$86ab07f0$@samsung.com> Subject: RE: [RFC PATCH v1] ufs: introduce async ufs interface initialization Date: Tue, 7 Jul 2020 15:50:45 +0900 Message-ID: <524801d6542a$f0744680$d15cd380$@samsung.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQJf3Lb61o2624A7HIYY502pzJR6wwGotN4cAhHmw+IB2c0IWqe79T+Q Content-Language: ko X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrGJsWRmVeSWpSXmKPExsWy7bCmrq67NEu8wc41phYP5m1js9jbdoLd 4uXPq2wWBx92slhM+/CT2eLT+mWsFqsXP2CxWHRjG5PFzS1HWSy6r+9gs1h+/B+TRdfdG4wW S/+9ZXHg9bh8xdvjcl8vk8eERQcYPb6v72Dz+Pj0FotH35ZVjB6fN8l5tB/oZgrgiMqxyUhN TEktUkjNS85PycxLt1XyDo53jjc1MzDUNbS0MFdSyEvMTbVVcvEJ0HXLzAE6WUmhLDGnFCgU kFhcrKRvZ1OUX1qSqpCRX1xiq5RakJJTYGhQoFecmFtcmpeul5yfa2VoYGBkClSZkJNxYude 1oJutoreu5tZGhjvsXQxcnJICJhI3D7dxtzFyMUhJLCDUeL5ni52kISQwCdGiad92hCJz4wS C+fcZ4Tp+HTvDAtEYhejRNeag1DOK0aJx18+grWzCWhLTNz1mQnEFhF4xyTRN9sExOYUsJKY 07OXDcQWFvCX+DR3KdgdLAIqEu/utoP18gpYSiy+cpoZwhaUODnzCVgNM9DMZQtfM0NcoSDx 8+kyVoj5bhKXVuxkhqgRkZjdCfGPhMAJDomNLWvZIBpcJFaeWssEYQtLvDq+hR3ClpJ42d/G DtHQzyixruc0C4QzAchZdxBqnbHEp8+fgQHAAbRCU2L9Ln2IsKLEzt9zGSE280m8+9rDClIi IcAr0dEmBFGiInFy4y1WmF0P9s2Dmughsf7mZ7YJjIqzkPw5C8mfs5D8Mwth8QJGllWMYqkF xbnpqcWGBcbI0b2JEZygtcx3ME57+0HvECMTB+MhRgkOZiUR3l5txngh3pTEyqrUovz4otKc 1OJDjKbAkJ/ILCWanA/MEXkl8YamRsbGxhYmZuZmpsZK4ry+VhfihATSE0tSs1NTC1KLYPqY ODilGpjcP3JV3W/p+Rsf7pMWte/IIn+nm9f/F920P3ZHaNWPd/ZnhbJPaC8yFL0asfuuohP/ o6IZ6+6uPPmLfdrjKbvZNHJs53nd4X49+4/bir9enROFM3fKFXoaFmhGPi94fiZ6rtXrr/8P hcUp/o94tprR9zPLpK8Ty5o/alQcmPxh3YIHpyWOvXy3pUlh57vlClKzU6TDKu/+/bV42t2K phxn18ssB7brex9SSZngwN21+csadt/ayG+mx1dtV/xaMnFHV2ZM+n63q5d359TfeP0z7EH7 88tH72sdZN70KFuTe0enfwin7uN5sRPX9F1PNzY89+p547U3mwuKk4+LTlqw5K79/uxFtQW9 P223aK+YvkKJpTgj0VCLuag4EQCMH7vKWQQAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrEIsWRmVeSWpSXmKPExsWy7bCSnK6rNEu8wZ4NUhYP5m1js9jbdoLd 4uXPq2wWBx92slhM+/CT2eLT+mWsFqsXP2CxWHRjG5PFzS1HWSy6r+9gs1h+/B+TRdfdG4wW S/+9ZXHg9bh8xdvjcl8vk8eERQcYPb6v72Dz+Pj0FotH35ZVjB6fN8l5tB/oZgrgiOKySUnN ySxLLdK3S+DKmN8aXjCRraJ/3R2mBsYHLF2MnBwSAiYSn+6dAbK5OIQEdjBKfJ23BSohJbH4 8gPmLkYOIFtY4vDhYoiaF4wSpxZ9YQSpYRPQlpi46zMTSEJE4A+TxPsn31khqqYzSUyaeYwZ pIpTwEpiTs9eNpBJwgK+Eo/+aoCEWQRUJN7dbWcHsXkFLCUWXznNDGELSpyc+QTsCGagBb0P Wxlh7GULXzNDHKcg8fPpMlYQW0TATeLSip3MEDUiErM725gnMArNQjJqFpJRs5CMmoWkZQEj yypGydSC4tz03GLDAqO81HK94sTc4tK8dL3k/NxNjOBo1NLawbhn1Qe9Q4xMHIyHGCU4mJVE eHu1GeOFeFMSK6tSi/Lji0pzUosPMUpzsCiJ836dtTBOSCA9sSQ1OzW1ILUIJsvEwSnVwGT5 jVPCcMG6ykTfmFPO90NupExPZoucbeVXtXZPIMuBN+pbzddNd13j+/LpqRsFy5Mc60MX7Eju 04i122wasWryJ0O9g+kPTvKI27FJ+nutZl1oqjN/aZC540nxtKCpqReszuzIzji1JfGQ6ds5 x2bMyZBKdG/Tm/5kypRLL0rYbDJWtxYa/T7fXPB/QeSqd3G/putcm5oVWsV60yVOdcqm7aGT 5ZeJ3znuEbA7+ofVm3MOCh9jhd9M54z8wzEpR7hl5s2TMlL9ZrpNWUoce9g5HotdZniqcl/y 4cqrtju2JNl3FQqXNTO1G+q/Fzgk+HuVgHHtVe7/yxwXN7at/Nw/oVOtynkG0zaPuWsTlZRY ijMSDbWYi4oTAVwTBn81AwAA X-CMS-MailID: 20200707065045epcas1p166c2d6094e7aa2f7b2802bd70fd8f5f2 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-Sendblock-Type: SVC_REQ_APPROVE CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20200702082826epcas2p2face6d1689c2f5efc1dcdb53c19804b8 References: <1593678039-139543-1-git-send-email-kwmad.kim@samsung.com> <000801d65425$2ce3ad50$86ab07f0$@samsung.com> Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org > > > When you set uic_link_state during sleep statae to > > > UIC_LINK_OFF_STATE, UFS driver does interface initialization that is > > > a series of some steps including fDeviceInit and thus, You might > > > feel that its latency is a little bit longer. > > > > > > This patch is run it asynchronously to reduce system wake-up time. > > Can you share your initial testing findings? > > How much time does it save? >=20 > Will share when I'm done. And I think you might already know and the time > is variant per device and its situation, particularly for fDeviceInit. >=20 > Thanks. > Kiwoong Kim I think it depends on each platform.=20 I has used this since years ago to reduce system wake-up time and could sav= e about 60ms at that time. BR Grant.