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Message-id: <561DD7A6.5010607@samsung.com> Date: Wed, 14 Oct 2015 13:18:46 +0900 From: Krzysztof Kozlowski <k.kozlowski@...sung.com> To: Anand Moon <linux.amoon@...il.com> Cc: Kukjin Kim <kgene@...nel.org>, Javier Martinez Canillas <javier@....samsung.com>, Lukasz Majewski <l.majewski@...sung.com>, Jaehoon Chung <jh80.chung@...sung.com>, devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, "linux-samsung-soc@...r.kernel.org" <linux-samsung-soc@...r.kernel.org>, Linux Kernel <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 3/3] ARM: dts: exynos5422-odroidxu3: Added UHS-I bus speed support On 14.10.2015 12:58, Anand Moon wrote: > hi Krzysztof, > > On 14 October 2015 at 05:29, Krzysztof Kozlowski > <k.kozlowski@...sung.com> wrote: >> On 14.10.2015 01:27, Anand Moon wrote: >>> Hi Krzysztof, >>> >>> On 13 October 2015 at 09:13, Krzysztof Kozlowski >>> <k.kozlowski@...sung.com> wrote: >>>> >>>> On 13.10.2015 12:08, Anand Moon wrote: >>>>> Hi Krzysztof, >>>>> >>>>> On 13 October 2015 at 05:44, Krzysztof Kozlowski >>>>> <k.kozlowski@...sung.com> wrote: >>>>>> On 13.10.2015 00:32, Anand Moon wrote: >>>>>>> Hi Krzysztof, >>>>>>> >>>>>>> On 12 October 2015 at 11:14, Krzysztof Kozlowski >>>>>>> <k.kozlowski@...sung.com> wrote: >>>>>>>> On 12.10.2015 00:46, Anand Moon wrote: >>>>>>>>> Added support for UHS-I bus speed 50MB/s (SDR50, DDR50) 104MB/s (SDR104) >>>>>>>> >>>>>>>> This description is not entirely correct. The MMC driver already >>>>>>>> supports these UHS speeds (you did not any code) so you rather enabled >>>>>>>> it (description of bindings says "is supported"). >>>>>>>> >>>>>>>> You mentioned DDR50 but I don't see respective property below. >>>>>>>> >>>>>>>> How do you know that these modes are really supported? I don't know. Can >>>>>>>> you convince me? >>>>>>> >>>>>>> Setting this DDR50 capability give me this error. That's the reason to >>>>>>> drop this capability. >>>>>> >>>>>> But you mentioned it in commit message! "Added support for UHS-I ... >>>>>> (DDR50)" >>>>>> >>>>>> In the same time dropping DDR50 is not an sufficient proof that "SDR50 >>>>>> and SDR104 are really supported". >>>>>> >>>>> >>>>> These changes are related to the microSD card capabilities. >>>>> So SDR50 have better frequency over DDR50. On the same Sandisk card. >>>>> >>>>> When the card select the capability for DDR50 >>>>> --------------------------------------------------- >>>>> [ 4.001477] mmc_host mmc1: Bus speed (slot 0) = 50000000Hz (slot >>>>> req 50000000Hz, actual 50000000HZ div = 0) >>>>> [ 4.001604] mmc1: new ultra high speed DDR50 SDHC card at address aaaa >>>>> [ 4.004505] mmcblk0: mmc1:aaaa SL32G 29.7 GiB >>>>> [ 4.009179] mmcblk0: error -110 sending status command, retrying >>>>> [ 4.009271] mmcblk0: error -115 sending stop command, original cmd >>>>> response 0x900, card status 0x900 >>>>> [ 4.009275] mmcblk0: error -84 transferring data, sector 0, nr 8, >>>>> cmd response 0x900, card status 0x0 >>>>> [ 4.025563] mmc_host mmc1: Bus speed (slot 0) = 50000000Hz (slot >>>>> req 400000Hz, actual 396825HZ div = 63) >>>>> [ 4.067770] Console: switching to colour frame buffer device 274x77 >>>>> [ 4.098782] mmc_host mmc1: Bus speed (slot 0) = 50000000Hz (slot >>>>> req 50000000Hz, actual 50000000HZ div = 0) >>>>> [ 4.099692] mmc1: tried to reset card >>>>> [ 4.101332] mmcblk0: p1 p2 >>>>> >>>>> >>>>> When the card select the capability for SDR50 >>>>> --------------------------------------------------------------------------------- >>>>> [ 2.439806] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req >>>>> 100000000Hz, actual 100000000HZ div = 0) >>>>> [ 2.449729] mmc1: new ultra high speed SDR50 SDHC card at address aaaa >>>>> [ 2.455984] mmcblk0: mmc1:aaaa SL32G 29.7 GiB >>>>> [ 2.461743] mmcblk0: p1 p2 >>>>> >>>>> Which will relate to better read/write speed. >>>> >>>> Which is not an answer to my question. To none of my previous questions. >>>> >>> >>> Basically UHS-I capability (sd-uhs-sdr12, sd-uhs-sdr25, sd-uhs-sdr50, >>> sd-uhs-sdr104) help tune speed supported for mmc >>> >>> I have tired to compare the speed on high speed UHS-I vs ultra high >>> speed UHS-I using izone utility. >>> >>> [ 2.572469] mmc_host mmc1: Bus speed (slot 0) = 50000000Hz (slot >>> req 50000000Hz, actual 50000000HZ div = 0) >>> [ 2.572609] mmc1: new high speed SDHC card at address aaaa >>> >>> Command line used: ./iozone -L64 -S32 -azecwI -+n -r4k -r64k >>> -r128k -s10M -i0 -i1 -i2 -f datafile -Rb out.xls >>> Output is in kBytes/sec >>> Time Resolution = 0.000001 seconds. >>> Processor cache size set to 32 kBytes. >>> Processor cache line size set to 64 bytes. >>> File stride size set to 17 * record size. >>> random >>> random bkwd record stride >>> kB reclen write rewrite read reread read >>> write read rewrite read fwrite frewrite fread >>> freread >>> 10240 4 1631 0 6556 0 5538 982 >>> 10240 64 8828 0 18897 0 17994 303 >>> 10240 128 6269 0 20670 0 20128 1096 >>> --------------------------------------------------------------------------------------------------------- >>> [ 2.613761] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot >>> req 100000000Hz, actual 100000000HZ div = 0) >>> [ 2.623573] mmc1: new ultra high speed SDR50 SDHC card at address aaaa >>> >>> Command line used: ./iozone -L64 -S32 -azecwI -+n -r4k -r64k >>> -r128k -s10M -i0 -i1 -i2 -f datafile -Rb out.xls >>> Output is in kBytes/sec >>> Time Resolution = 0.000001 seconds. >>> Processor cache size set to 32 kBytes. >>> Processor cache line size set to 64 bytes. >>> File stride size set to 17 * record size. >>> random >>> random bkwd record stride >>> kB reclen write rewrite read reread read >>> write read rewrite read fwrite frewrite fread >>> freread >>> 10240 4 1809 0 7507 0 5233 859 >>> 10240 64 11622 0 31250 0 28072 516 >>> 10240 128 4320 0 34417 0 32509 1148 >>> >>> My observation is that their slight increase in read/write operation. >>> >>> Hope I have tried to answer you query. If I am wrong please let me know. >> >> Nope, that did not answer my query. You gave some performance benchmarks >> but my question was not about the speed of anything. The question is >> (once again): >> How do you know that these modes are really supported? >> >> You are marking the *host* as supporting these modes. Please provide >> information that host supports them *really*, not by experimenting "oh, >> it seems to work now, maybe it will work always". >> >> Usually vendors, if their products implement some kind of >> specification/protocol, they mark the products as "compatible with XYZ" etc. > > I found this link from hardkernel website which specify the interface support > > http://www.hardkernel.com/main/products/prdt_info.php?g_code=G141578491347 > > Manufacturer Part Number : Sandisk SDSDQAD-016G > Interface : UHS-1 SDR50 > > I don't know much internal specification of the Odroid XU3/XU4 Boards. > > I am not sure if it will support host will sd-uhs-sdr104, but it will > be compatible for sd-uhs-sdr12, sd-uhs-sdr25, sd-uhs-sdr50. I can't find how this proofs anything. You can sell an UHS-II card labelled "for ODROID-XU3 and XU4" and it will work fine on Odroid-XU3. Does it mean that Odroid-XU3 supports UHS-II? That UHS-II card will work even on 10-year camera! Of course not in UHS mode... Does it mean that this 10-year old camera supports UHS-II? Of course not because it will work in some HS mode (or even pre-HS). You can label any SD card as "for Odroid XU3" because any card will work... Best regards, Krzysztof -- 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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