On Thu, May 05, 2016 at 03:33:41PM +0800, Guodong Xu wrote:
Hi, Liming
I just noticed I failed to send this email. Resending...
I have a board with me using 4.6-rc3 kernel, about 20 insertion/removal, UHS-1 mode sd, all success.
OK, please tell me the git tree and branch, let me also have a try.
For 4.6-rc3: git tree and branch: https://github.com/96boards-hikey/linux/tree/hikey-mainline-rebase-v4.6-rc3
You can use it with rootfs here: https://builds.96boards.org/snapshots/hikey/community/hikey-mainline-rebase/...
I will test a 4.4 version in this afternoon. Will report back.
OK, thanks,
(If I recall correctly.) I tested 60 insertion/removal cycles. The first forty are all successes. Then I see two of them failed. But such failure doesn't last. I mean automatically the next insertion can work normal again.
So, my intention is this is not a critical issue, and will not be solved.
Hi Guodong,
Thanks for your help. Another issue is that whether below branch supports HDMI out? I'm using arch/arm64/configs/defconfig and found no output on HDMI display. https://github.com/96boards-hikey/linux/tree/hikey-mainline-rebase-4.4
BTW, HDMI works well when I tested 3.18 kernel.
BR, Liming Wang
-Guodong
On 22 April 2016 at 15:10, Liming Wang liming.wang@canonical.com wrote:
On Fri, Apr 22, 2016 at 11:12:56AM +0800, Guodong Xu wrote:
On 21 April 2016 at 21:11, Liming Wang liming.wang@canonical.com wrote:
On Thu, Apr 21, 2016 at 04:38:29PM +0800, Guodong Xu wrote:
On 21 April 2016 at 16:07, Haojian Zhuang haojian.zhuang@linaro.org wrote:
On 21 April 2016 at 15:29, Peter Griffin peter.griffin@linaro.org wrote: > Hi Guodong, > > On 21 April 2016 at 02:38, Guodong Xu guodong.xu@linaro.org wrote: >> >> Hi, Liming >> >> The subject line is miss-leading. :) >> >> Kernel 4.4 based hikey-mainline-rebase is full featured. MMC/SD card >> is supported. One of the possible reason should be related to mmc host >> controller not reset completely. >> >> There is no such issue in UEFI. But since you are using uboot, maybe >> it lacks some initialization codes for mmc controller. > > > Does the UEFI code assert the reset line on the IP before booting the > kernel? > If so I might need to add something similar to U-Boot. >
UEFI didn't reset eMMC/SD just before booting the kernel.
Let's wait and see Liming's test result. I would prefer to do this in mmc kernel driver, instead of bootloader.
Hi Guodong,
I have tested your patch, but unfortunately, with your patch, my 4.4 kernel still can't detect any sd card on hikey board. BTW, my hikey board is LeMaker's 2G DRAM/8G NAND FLash version.
But I found some causes why the kernel can't detect the sd card: it's all about the dtb.
For 3.18 kernel, I used dtbs from snapshot version [1] and release version [2], but only release version works well. After investigating the code, I found below commit removes some settings from dts:
commit d840635065f5a2731dea22cf827d8dadc6524729 Author: Fei Wang william.wfei@gmail.com Date: Fri Dec 18 22:31:55 2015 +0800
dts: hikey: fix some sd card partition not recognized Some sd card be recognized SDR50 and set 1.8v, but when read partition return -84 error so that not get partition information. TODO:make sure set voltage is right!If I revert this commit, the 3.18 kernel can detect sd cards.
From this and log messages below, your SD card is a 'UHS' mode card. (https://www.sdcard.org/developers/overview/bus_speed/). Let me know if it is not.
Yes, I tested two cards, both are UHS mode.
- For 4.4 kernel, I found this commit modifies the wrong location:
commit 40fd5e086e1ef1835b97f11f4f5d6a3253c2fe3d Author: Guodong Xu guodong.xu@linaro.org Date: Sat Feb 6 19:55:49 2016 +0800
arm64: dts: hi6220: add sd-uhs- properties into dwmmc_1 With these properties added, sd cards inserted into hikey can work at UHS mode if they have such capability. Due to some silicon defect in hi6220, a UHS support patch must be applied into drivers/mmc/host/dw_mmc to enable UHS mode. If you didn't add this patch, but added sd-uhs- properties into dwmmc_1, then sd cards cannot work.This patch should modify dwmmc_1 but it actually modifies dwmmc_0. After fix this bug, my 4.4 kernel also can detect sd card.
Thanks a lot. I will fix that.
- In all my testings, whether 3.18 or 4.4 kernel, on UEFI or u-boot, the kernel
can't detect sd card when booting up. Only if I re-insert the sd card to slot, the kernel could detect the sd card.
The boot sequence of UEFI is: if SD card exists, it will try boot from SD card; when there is no valid partition and kernel image (and files) in SD cards, then it will not boot. Does this match what you saw on UEFI w/ both 3.18 and 4.4 kernel?
My target is to make kernel detect SD card, so I always make UEFI boot from emmc.
- But the detections are not 100% successful.
Do you mean on 3.18 or 4.4? If 3.18, I'm afraid we will not do
On both 3.18 and 4.4.
anything since it's already released and moved on to 4.4.
I have a board with me using 4.6-rc3 kernel, about 20 insertion/removal, UHS-1 mode sd, all success.
OK, please tell me the git tree and branch, let me also have a try.
I will test a 4.4 version in this afternoon. Will report back.
OK, thanks,
BR, Liming Wang
If it fails, the kernel prints: mmc_host mmc1: Bus speed (slot 0) = 25000000Hz (slot req 400000Hz, actual 390625HZ div = 32) mmc1: error -110 whilst initialising SD card
If it succeeds, the kernel prints: mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 100000000Hz, actual 100000000HZ div = 0) mmc1: new ultra high speed SDR50 SDHC card at address aaaa
It seems that when host->bus_hz is 100000000Hz, it will succeed, otherwise, 25000000Hz or 50000000Hz, it always fails.
Wish my testing results may help you to fix the bug.
Very useful. Thanks a lot.
-Guodong
BR, Liming Wang
[1] https://builds.96boards.org/snapshots/hikey/linaro/debian/latest/ [2] https://builds.96boards.org/releases/hikey/linaro/debian/latest/
From SoC hardware engineer, he confirmed that need to set assert bit then wait, then deassert.
-Guodong
Regards Haojian
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