Hi, Dong. On 12/23/2014 11:30 AM, Dong, Chuanxiao wrote: > Hi Jaehoon, > > It is in a draft eMMC5.1 spec. I believe the official eMMC5.1 spec will be released soon. Thanks~.I want to see the eMMC5.1 spec. :) I will test this feature with my board. Best Regards, Jaehoon Chung > > Thanks > Chuanxiao > >> -----Original Message----- >> From: linux-mmc-owner@xxxxxxxxxxxxxxx >> [mailto:linux-mmc-owner@xxxxxxxxxxxxxxx] On Behalf Of Jaehoon Chung >> Sent: Monday, December 22, 2014 12:56 PM >> To: Dong, Chuanxiao; linux-mmc@xxxxxxxxxxxxxxx >> Subject: Re: [RFC PATCH 0/5]mmc: Soft Command queue implementation for >> eMMC5.1 device >> >> Hi, Chuanxiao. >> >> Was it published for the eMMC5.1 spec? >> >> Best Regards, >> Jaehoon Chung >> >> On 12/19/2014 05:04 PM, Chuanxiao Dong wrote: >>> Hello, >>> >>> Seems community already have some implementation for the eMMC5.1 >>> device command queue feature, but that require the eMMC host >>> controller to support CMDQ. In my platform, I don't have this kind of >>> eMMC host controller but I have a Samsung eMMC5.1 device which can >> support the Command queue. >>> >>> With this limitation, I have to let eMMC host controller to manually >>> send the CMD44/45/13/46/47. So in this way, more commands are needed >>> for an I/O request, more interrupts/schedule are needed in driver. >>> >>> Even this way have some more software overhead, but it can still use >>> the eMMC5.1 device Command queue feature. After test with the iozone >> command: >>> "iozone -zec -t 4 -i0 -i2 -F iozonefile1 iozonefile2 iozonefile3 >>> iozonefile4 -+n -I -r 4k -s 500m -O -R -+r -+D" to test random >>> performance, I saw a performance improvment for random read on my >> eMMC5.1 device: >>> >>> Random read >>> SW CMDQ: 5544.6 >>> Normal Read: 3993.05 >>> >>> So I want to send this serial patches as RFC patch for reviewing >>> >>> >>> Chuanxiao Dong (5): >>> mmc: replace sbc to precmd and add postcmd >>> mmc: host: add runtime PM for host class dev >>> mmc: queue: change mqrq_cur and mqrq_pre to mq qdepth >>> mmc: core: add support for CMDQ feature in MMC Core stack >>> mmc: sdhci: add SW CMDQ support for CHT SDHCI host >>> >>> drivers/mmc/card/block.c | 538 >> ++++++++++++++++++++++++++++++++++++++--- >>> drivers/mmc/card/queue.c | 213 ++++++++-------- >>> drivers/mmc/card/queue.h | 14 +- >>> drivers/mmc/core/core.c | 78 +++++- >>> drivers/mmc/core/host.c | 14 ++ >>> drivers/mmc/core/mmc.c | 43 +++- >>> drivers/mmc/host/dw_mmc.c | 8 +- >>> drivers/mmc/host/mmci.c | 14 +- >>> drivers/mmc/host/omap_hsmmc.c | 18 +- >>> drivers/mmc/host/sdhci-acpi.c | 1 - >>> drivers/mmc/host/sdhci-pci.c | 1 - >>> drivers/mmc/host/sdhci.c | 137 +++++++++-- >>> include/linux/mmc/card.h | 3 + >>> include/linux/mmc/core.h | 5 +- >>> include/linux/mmc/host.h | 5 + >>> include/linux/mmc/mmc.h | 21 ++ >>> include/linux/mmc/pm.h | 1 + >>> include/linux/mmc/sdhci.h | 1 + >>> 18 files changed, 909 insertions(+), 206 deletions(-) >>> >> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body >> of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at >> http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
