On 10/05/2011 05:02 PM, Seungwon Jeon wrote: > Jaehoon Chung wrote: >> >> Hi Mr.Jeon >> >> One question...if we used predefined transfer, didn't send stop-command? >> then i think that didn't need to enter this condition..how about this? >> >> In __dw_mci_start_reqeust() function(at your patch) >> >> if (mrq->stop) >> host->stop_cmdr = dw_mci_prepare_command(slot->mmc, mrq->stop); >> >> If i misunderstood something, plz let me know...Thanks. > Yes, predefined transfer doesn't send stop command normally. > But if transfer error is occurred, stop command is required.
Thanks for your answer. i didn't look in detail. your patch is worked when there is data->error, send stop command..right? This patch looks good to me. Best Regards, Jaehoon Chung > > Thank you for test. > Best regards, > Seungwon Jeon. >> >> Tested-by: Jaehoon Chung <jh80.ch...@samsung.com> >> >> On 09/28/2011 05:23 PM, Seungwon Jeon wrote: >> >>> Andrei Warkentin wrote: >>>> 2011/9/26 Seungwon Jeon <tgih....@samsung.com>: >>>>> Andrei Warkentin wrote: >>>>>> Hi Seungwon, >>>>>> >>>>>> ----- Original Message ----- >>>>>>> From: "Seungwon Jeon" <tgih....@samsung.com> >>>>>>> To: linux-mmc@vger.kernel.org >>>>>>> Cc: "Chris Ball" <c...@laptop.org>, linux-samsung-...@vger.kernel.org, >>>>>> "kgene kim" <kgene....@samsung.com>, "dh han" >>>>>>> <dh....@samsung.com>, "Seungwon Jeon" <tgih....@samsung.com> >>>>>>> Sent: Monday, September 26, 2011 7:46:59 AM >>>>>>> Subject: [PATCH] mmc: dw_mmc: Support predefined multiple block >>>>>> transfers. >>>>>>> >>>>>>> This patch adds the support for predefined multiple block read/write. >>>>>>> >>>>>>> Signed-off-by: Seungwon Jeon <tgih....@samsung.com> >>>>>> >>>>>> Without knowing much about dw_mmc host, your logic otherwise looks ok, >>>>>> given what >>>>>> I've previously done for SDHCI as far as CMD23/Auto-CMD23 enhancement. >>>>>> Just curious, what eMMC cards did you test this on, and what >>>> improvement >>>>>> did you see? >>>>> >>>>> Thank you for review. >>>>> As you done, predefined transfer is required for reliable writes and >>>> eMMC4.5 feature. >>>>> Sadly, I didn't gain an improvement in my case. >>>>> (I don't know whether I can clarify the tested eMMC card, just one >>>> sample.) >>>>> >>>> >>>> So far I've seen some Sandisk cards have a noticeable real-life >>>> improvement (30%) over >>>> open-ended transfers. >>>> >>>> You might wish to try out https://github.com/andreiw/superalign to be >>>> certain. >>> >>> I had already tested this patch with IOZONE, but I found no difference. >>> Maybe a result depends on eMMC device. >>> As your recommend, I applied above benchmark tool. >>> Predefined transfer seems like a little better, but there is no >> difference. >>> >>> Thanks. >>> Seungwon Jeon. >>> >>>> >>>> A >>>> -- >>>> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in >>>> the body of a message to majord...@vger.kernel.org >>>> 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 majord...@vger.kernel.org >>> 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 majord...@vger.kernel.org >> 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 majord...@vger.kernel.org > 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 majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
