From: hkallweit1@gmail.com (Heiner Kallweit)
To: linus-amlogic@lists.infradead.org
Subject: eMMC tuning issue on Odroid C2 and a possible solution
Date: Thu, 12 Oct 2017 22:29:34 +0200 [thread overview]
Message-ID: <08c2642a-06b2-f36b-80b1-3be82c346887@gmail.com> (raw)
In-Reply-To: <1507838745.16356.270.camel@baylibre.com>
Am 12.10.2017 um 22:05 schrieb Jerome Brunet:
> On Thu, 2017-10-12 at 21:49 +0200, Heiner Kallweit wrote:
>>> The result of the tuning does not depends on starting point, so I don't
>>> really
>>> understand how it would significantly change things.
>>>
>>
>> I think it depends on the tx phase starting point.
>>
>
> If the result of the tuning is not independent of the starting, instead of just
> telling me, it is fairly easy for you to give actual result, like I asked you:
>
With hs200 at 200 and tx phase starting point 0 I get the following with no further CRC errors.
[ 0.726572] meson-gx-mmc d0074000.mmc: d0074000.mmc#rx phase/delay tunning...
[ 0.728664] hctosys: unable to open rtc device (rtc0)
[ 0.728827] USB_OTG_PWR: disabling
[ 0.728831] TFLASH_VDD: disabling
[ 0.728833] TF_IO: disabling
[ 0.753183] Waiting for root device /dev/mmcblk0p1...
[ 0.754352] meson-gx-mmc d0074000.mmc: success with phase: 270
[ 0.758386] meson-gx-mmc d0074000.mmc: d0074000.mmc#tx phase/delay tunning...
[ 0.768050] meson-gx-mmc d0074000.mmc: success with phase: 120
[ 0.771235] meson-gx-mmc d0074000.mmc: d0074000.mmc#rx phase/delay tunning...
[ 0.780902] meson-gx-mmc d0074000.mmc: success with phase: 0
[ 0.784036] mmc0: new HS200 MMC card at address 0001
[ 0.789090] mmcblk0: mmc0:0001 DJNB4R 116 GiB
[ 0.793328] mmcblk0boot0: mmc0:0001 DJNB4R partition 1 4.00 MiB
[ 0.799198] mmcblk0boot1: mmc0:0001 DJNB4R partition 2 4.00 MiB
[ 0.805048] mmcblk0rpmb: mmc0:0001 DJNB4R partition 3 4.00 MiB, chardev (249:0)
[ 0.812799] mmcblk0: response CRC error sending r/w cmd command, card status 0x900
[ 0.819727] meson-gx-mmc d0074000.mmc: d0074000.mmc#tx phase/delay tunning...
[ 0.827007] meson-gx-mmc d0074000.mmc: success with phase: 210
[ 0.832559] meson-gx-mmc d0074000.mmc: d0074000.mmc#rx phase/delay tunning...
[ 0.839848] meson-gx-mmc d0074000.mmc: success with phase: 0
>>> Ok, starting from Rx:0 Tx:270 then tuning gives you Tx:300 Rx:90
>>> And what different did it gives you starting Rx:0/Tx:0 ?
>
> And if the result are indeed vastly different, let's debug and get a real
> explanation.
>
>> Tuning does:
>> rx phase tuning
>> tx phase tuning
>> rx phase tuning
>>
>> Result of each step depends on result of previous step.
>
> Again, we don't agree.
>
>> So also the initial
>> rx phase tuning result depends on the starting point of tx phase.
>
> The first Rx tuning is there only to get a sane starting point for the tx tuning
> ,as explained in the code. This is the reason why is not done when re-tuning.
>
>
>
next prev parent reply other threads:[~2017-10-12 20:29 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-11 20:46 Heiner Kallweit
2017-10-12 15:22 ` Jerome Brunet
2017-10-12 18:17 ` Heiner Kallweit
2017-10-12 19:34 ` Jerome Brunet
2017-10-12 19:49 ` Heiner Kallweit
2017-10-12 20:05 ` Jerome Brunet
2017-10-12 20:29 ` Heiner Kallweit [this message]
2017-10-12 20:59 ` Jerome Brunet
2017-10-12 21:04 ` Heiner Kallweit
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