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Subject: Re: [PATCH v11 33/56] Input: atmel_mxt_ts - delay enabling IRQ when
 not using regulators
From:   Dmitry Osipenko <digetx@gmail.com>
To:     "Wang, Jiada" <jiada_wang@mentor.com>
Cc:     nick@shmanahar.org, dmitry.torokhov@gmail.com, jikos@kernel.org,
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Date:   Sun, 17 May 2020 16:26:32 +0300
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17.05.2020 16:08, Dmitry Osipenko пишет:
> 17.05.2020 06:32, Wang, Jiada пишет:
>> Hello Dmitry
>>
>> On 2020/05/14 13:53, Dmitry Osipenko wrote:
>>> 13.05.2020 08:07, Wang, Jiada пишет:
>>>> Hello Dmitry
>>>>
>>>> On 2020/05/12 8:13, Dmitry Osipenko wrote:
>>>>> 11.05.2020 05:05, Wang, Jiada пишет:
>>>>>> Hello Dmitry
>>>>>>
>>>>>> Thanks for your comment and test,
>>>>>>
>>>>>> can you let me know which platform (board) you are using for test,
>>>>>> and DTS changes if you have added any.
>>>>>
>>>>> That's this device-tree [1] without any extra changes.
>>>>>
>>>> I am using Samsung Chromebook Pro for testing,
>>>> but obviously some of the use cases it can't cover.
>>>>
>>>> I also would like to test on same device you are using,
>>>> would you please let me know how to boot Acer Iconia Tab A500
>>>> with custom images. Are you booting Linux or Android on it?
>>>
>>> I'm using Ubuntu 20.04 on it at the moment. In order to boot custom
>>> images you'll need at least to install a custom recovery, which will
>>> allow to flash boot.img on eMMC storage.
>>>
>>> Ideally, you'll need to install an unlocked bootloader that will enable
>>> Android's fastboot, and thus, allow to easily boot kernel zImage without
>>> messing with flashing boot images.
>>>
>>> Could you please tell what is the current state of yours device: does it
>>> have a stock Android installed? is it rooted? is custom recovery
>>> installed?
>>>
>> Thanks for your information
>>
>> By following instructions found in XDA forums,
>> now I am able to install an unlocked bootloader,
>> boot among primary kernel, recovery kernel or fastboot,
>> an Android custom stock rom also has been installed
> 
> Awesome!
> 
>> Could you please let me know how to install local built ubuntu images
> 
> Sure, please follow these steps:
> 
> 1. Download rootfs from
> http://cdimage.ubuntu.com/ubuntu-base/releases/20.04/release/ubuntu-base-20.04-base-armhf.tar.gz
> 
> 2. Extract it wherever you want yours root to be, like ExternalSD card
> or eMMC /data partition or even NFS directory if you'll use usbnet.
> 
> 3. Clone this kernel https://github.com/grate-driver/linux which is a
> recent upstream linux-next + work-in-progress patches that haven't been
> merged into upstream yet. For example DRM bridges and Tegra Partition
> Table patches are under review now.
> 
> 4. Select tegra_defconfig:
> 
> 	ARCH=arm make tegra_defconfig
> 
> 5. Compile kernel:
> 
> 	ARCH=arm make
> 
> 6. Append DTB to zImage:
> 
> 	cat arch/arm/boot/zImage
> arch/arm/boot/dts/tegra20-acer-a500-picasso.dtb > arch/arm/boot/zImage-dtb
> 
> 7. Turn on A500 and select 'fastboot' option in the bootloader's menu.
> 
> 8. Boot compiled kernel:
> 
> 	fastboot -c "root=/dev/mmcblk2p8 gpt tegraboot=sdmmc" boot
> arch/arm/boot/zImage-dtb
> 
> 9. Grab touchscreen/WiFi/Bluetooth firmware files from
> https://github.com/digetx/linux-firmware
> 
> 10. Grab ALSA UCM rule from https://github.com/digetx/alsa-ucm-conf
> 
> 11. Enjoy!
> 
> Please let me know you'll experience any problems, I'll be glad to help.
> 

Also, there is an Ubuntu PPA for Tegra20/30 devices with drivers from
GRATE-driver project:
https://launchpad.net/~grate-driver/+archive/ubuntu/ppa

Please keep in mind that there is no GL driver that work with upstream
kernel.

I'd recommend to use KDE Plasma 5 for the desktop environment. For the
good experience you'll need to tell Qt to use software render, the
easiest way is to set required env variables globally:

echo -e
"QT_QUICK_BACKEND=software\nLIBGL_ALWAYS_SOFTWARE=1\nQT_IM_MODULE=qtvirtualkeyboard"
>> /etc/security/pam_env.conf