Hi,
On Thu, May 21, 2015 at 2:38 PM, Lawrence Yu <lawy...@gmail.com> wrote:
> Hi,
>
>
>
> On Mon, May 18, 2015 at 11:03 PM, Lawrence Yu <lawy...@gmail.com> wrote:
>>
>> Hi,
>>
>>
>> On Mon, May 18, 2015 at 8:01 PM, Chen-Yu Tsai <w...@csie.org> wrote:
>>>
>>> Hi,
>>>
>>> On Mon, May 18, 2015 at 12:08 AM, Lawrence Y <lawy...@gmail.com> wrote:
>>> > Hi,
>>> >
>>> > I'm not sure if it is my sdcard, my A31 hummingboard device, or
>>> > something I
>>> > am doing wrong, but I've been trying to boot an A31 hummingbird from an
>>> > sdcard using the kernel from the sunxi-next branch at
>>> >
>>> > https://github.com/mripard/linux
>>> > 33da8d2 - Merge tag 'ib-mfd-regulator-v4.2' into sunxi-next
>>> >
>>> > and ran into a problem where the kernel would hang while waiting for
>>> > the
>>> > root device /dev/mmcblk0p2
>>> >
>>> > If I use the sun6i-a31-hummingbird.dtb built from the linux mainline
>>> > the
>>> > sdcard will boot the root file system correctly, but if I use the
>>> > sun6i-a31-hummingbird.dtb from sunxi-next the kernel will hang while
>>> > waiting
>>> > for /dev/mmcblk0p2.
>>> >
>>> > I ran a git bisect and narrowed down the commit that causes the problem
>>> > I am
>>> > seeing to
>>> >
>>> > commit bab03561224baa536b98f1d137d2b6b5dd159763
>>> > Date: Tue Mar 10 19:59:21 2015 +0800
>>> >
>>> > ARM: dts: sun6i: hummingbird: Add AXP221 regulator nodes
>>> >
>>> > This patch adds the AXP221 regulators. Only the ones directly used
>>> > on the board are added.
>>> >
>>> > Please let me know if there is anything I can do to help fix this
>>> > problem,
>>> > if it really is a problem. I have an A31 hummingbird available for
>>> > testing.
>>>
>>> The latest commit you pointed to merges AXP221 support with regulators.
>>> The Hummingbird A31 dts was also updated with the new regulator nodes.
>>>
>>> Do you have AXP20X MFD and regulator support enabled?
>>> CONFIG_MFD_AXP20X and CONFIG_REGULATOR_AXP20X should be y.
>>>
>>>
>>> ChenYu
>>
>>
>> I tested with the sunxi_defconfig and confirmed that
>>
>> CONFIG_INPUT_AXP20X_PEK=y
>> CONFIG_MFD_AXP20X=y
>> CONFIG_REGULATOR_AXP20X=y
>>
>> are set in the .config file by the sunxi_defconfig and was used when the
>> root file system on the mmc card is not detected during the boot.
>>
>> I did some more experimenting and found that if I change the vmmc-supply
>> for the mmc0 in the dts from vcc_3v0 to reg_vcc3v0 the root file system on
>> the sdcard will boot properly
>>
>> @@ -119,7 +119,7 @@
>> &mmc0 {
>> pinctrl-names = "default";
>> pinctrl-0 = <&mmc0_pins_a>, <&mmc0_cd_pin_hummingbird>;
>> - vmmc-supply = <&vcc_3v0>;
>> + vmmc-supply = <®_vcc3v0>;
>> bus-width = <4>;
>> cd-gpios = <&pio 0 8 GPIO_ACTIVE_HIGH>; /* PA8 */
>> cd-inverted;
>>
>> I am going to try Han's suggestion of using the vcc_3v3 when I get a
>> chance to see if that makes it better.
>>
>> Lawrence
>>
>
> I changed the vmmc-supply in the mmc0 dts section to be reg_vcc3v0 from
> vcc_3v0 and the tablet seems to boot to login from the sdcard consistently
> now.
>
> I'm not sure if the AXP20x module is being loaded or not from the
> hummingbird A31 dts file. I did a grep of the dmesg and there is no
> occurrence of the string AXP in the dmesg logs during boot. If the AXP20x
> module is not being loaded, maybe that could explain why the vcc_3v0 did not
> work for the mmc0 section?
You should see something like the following:
axp20x 2-0068: AXP20x variant AXP221 found
input: axp20x-pek as
/devices/platform/soc@01c00000/1f03400.i2c/i2c-2/2-0068/axp20x-pek/input/input0
axp20x 2-0068: AXP20X driver loaded
If not, either the AXP driver and/or the P2WI driver is missing.
Since you already mentioned you have AXP enabled, check
CONFIG_I2C_SUN6I_P2WI
for P2WI support. The AXP221 is not a standard I2C chip.
ChenYu
> I also added some printk statements to the axp209 probe function that did
> not emit anything to the dmesg output, but I'm not sure if that is
> conclusive or not since I'm not sure if printk works in the probe.
>
> Maybe someone could suggest a better way to tell if the AXP221 support is
> being loaded?
>
> Thanks!
>
> Lawrence
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