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Message-ID: <CALMYJDuxaUKkQaU0aHp+omnVy+Vs5y9ZL=LhkgVwhF8POP=d6g@mail.gmail.com> Date: Thu, 9 Feb 2012 13:23:42 +0530 From: Santosh Y <santoshsy@...il.com> To: Namjae Jeon <linkinjeon@...il.com> Cc: Vinayak Holikatti <vinholikatti@...il.com>, James.Bottomley@...senpartnership.com, linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org, patches@...aro.org, linux-samsung-soc@...r.kernel.org, saugata.das@...aro.org, arnd@...db.de, venkat@...aro.org, girish.shivananjappa@...aro.org, vishak.g@...sung.com, k.rajesh@...sung.com, yejin.moon@...sung.com Subject: Re: [PATCH 0/4] [SCSI] ufshcd: UFS Host Controller Driver On Thu, Feb 9, 2012 at 10:04 AM, Namjae Jeon <linkinjeon@...il.com> wrote: > 2012/2/6 Santosh Y <santoshsy@...il.com>: >> On Mon, Feb 6, 2012 at 4:15 AM, Namjae Jeon <linkinjeon@...il.com> wrote: >>> 2012/2/5 Namjae Jeon <linkinjeon@...il.com>: >>>> 2012/2/2 Vinayak Holikatti <vinholikatti@...il.com>: >>>>> From: Santosh Yaraganavi <santoshsy@...il.com> >>>>> >>>>> UFS is designed to be the most advanced specification for >>>>> both embedded and removable flash memory-based storage in mobile devices >>>>> such as smart phones and tablet computers. The UFS standard represents >>>>> an evolutionary progression of JEDEC standards in this field, and has been >>>>> specifically tailored for mobile applications and computing systems requiring >>>>> high performance and low power consumption. The initial data throughput for >>>>> UFS will be ~300 megabytes per second (MB/s), and the standard also supports >>>>> command queuing features to raise random read/write speeds. >>>>> >>>>> To achieve the highest performance and most power efficient data >>>>> transport, UFS uses the leading industry interface standards to form its >>>>> Interconnect Layer: MIPI® Alliance’s M-PHY and UniProSM specifications. >>>>> UniPro is a comprehensive specification meant to act as a universal >>>>> chip-to-chip protocol, providing a common tunnel for other protocols. >>>>> The M-PHY interface is designed as the primary physical interface (PHY layer) >>>>> for the UniPro specification, and is a high speed serial interface targeting >>>>> up to 2.9 gigabits per second (Gbps) per lane with up-scalability to 5.8Gbps >>>>> per lane. >>>>> >>>>> MIPI’s M-PHY and UniPro specifications are optimized for mobile applications, >>>>> and are designed from the ground up for efficient power management in mobile >>>>> devices, including enabling efficient transitions between the active and power >>>>> save modes. Combined with a low active power level and a near-zero idle power >>>>> level, UFS offers the promise for significant reductions in device power >>>>> consumption. >>>>> >>>>> The UFS standard adopts the well-known SCSI Architecture Model and command >>>>> protocols supporting multiple commands with command queuing features and >>>>> enabling a multi-thread programming paradigm. This differs from conventional >>>>> flash-based memory cards and embedded flash solutions which process one >>>>> command at a time, limiting random read/write access performance. >>>>> In addition, a forthcoming complementary UFS Host Controller Interface (HCI) >>>>> specification will allow system designers greater flexibility by simplifying >>>>> the involvement of the host processor in the operation of the flash storage >>>>> subsystem. The UFS HCI specification and the adoption of SCSI will provide >>>>> a well-known software programming model and enable wider market adoption. >>>>> >>>>> This patchset contains PCIe based UFS host controller driver which complies >>>>> to UFSHCI 1.0 and 1.1. The driver is based on Linux SCSI framework. >>>>> The driver is tested with UFS Host controller(FPGA) and UFS device(FPGA). >>>>> >>>>> This patch set is successfully applied on kernel version 3.3-rc2. >>>>> >>>>> Santosh Yaraganavi (4): >>>>> [SCSI] ufshcd: UFS Host controller driver >>>>> [SCSI] ufshcd: UFS UTP Transfer requests handling >>>>> [SCSI] ufshcd: UFSHCI error handling >>>>> [SCSI] ufshcd: SCSI error handling >>>>> >>>>> drivers/scsi/Kconfig | 1 + >>>>> drivers/scsi/Makefile | 1 + >>>>> drivers/scsi/ufs/Kconfig | 49 ++ >>>>> drivers/scsi/ufs/Makefile | 2 + >>>>> drivers/scsi/ufs/ufs.h | 203 +++++ >>>>> drivers/scsi/ufs/ufshcd.c | 1954 +++++++++++++++++++++++++++++++++++++++++++++ >>>>> drivers/scsi/ufs/ufshci.h | 360 +++++++++ >>>>> 7 files changed, 2570 insertions(+), 0 deletions(-) >>>>> create mode 100644 drivers/scsi/ufs/Kconfig >>>>> create mode 100644 drivers/scsi/ufs/Makefile >>>>> create mode 100644 drivers/scsi/ufs/ufs.h >>>>> create mode 100644 drivers/scsi/ufs/ufshcd.c >>>>> create mode 100644 drivers/scsi/ufs/ufshci.h >>>>> >>>>> -- >>>>> 1.7.5.4 >>>> Hi. >>>> I have been waiting for ufs contribution. >>>> Unfortunately I don't have real target supported ufs(maybe only you >>>> have it). I can not debug and run this code, So just review only code >>>> with specification. >>>>> >>> Hi. Santosh. >>> Would you share performance measurement result (read/write seq,ran) ? >>> Thanks. >> >> Hi Namjae, >> >> Currently UFS Driver is being tested on on UFS Controller FPGA and UFS >> Device FPGA. So currently the main concentration is on functionality. >> Performance on FPGA will not be the correct measurement. > Hi. Santosh. > If possible, I hope that you share performance to us when you post new > patch next time. > And Personally I am expecting good random I/O speed on UFS. > Thanks. Hi Namjae, As soon as the hardware is available, we'll share the performance results. >> >>>>> -- >>>>> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in >>>>> the body of a message to majordomo@...r.kernel.org >>>>> More majordomo info at http://vger.kernel.org/majordomo-info.html >>>>> Please read the FAQ at http://www.tux.org/lkml/ >> >> -- >> ~Santosh -- ~Santosh -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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