[U-Boot] [PATCH] sunxi: Add generic defconfigs for A33 Q8 tablets with 1024x600 / 800x480 LCD

[Chen-Yu Tsai]

On Fri, Sep 25, 2015 at 4:06 PM, Hans de Goede <hdegoede at redhat.com> wrote:
> Hi,
>
> On 25-09-15 04:35, Chen-Yu Tsai wrote:
>>
>> On Thu, Sep 24, 2015 at 11:24 PM, Hans de Goede <hdegoede at redhat.com>
>> wrote:
>
>
> <snip>
>
>>> diff --git a/configs/q8_a33_tablet_800x480_defconfig
>>> b/configs/q8_a33_tablet_800x480_defconfig
>>> new file mode 100644
>>> index 0000000..a9c2b62
>>> --- /dev/null
>>> +++ b/configs/q8_a33_tablet_800x480_defconfig
>>> @@ -0,0 +1,24 @@
>>> +CONFIG_ARM=y
>>> +CONFIG_ARCH_SUNXI=y
>>> +CONFIG_MACH_SUN8I_A33=y
>>> +CONFIG_DRAM_CLK=456
>>> +CONFIG_DRAM_ZQ=15291
>>> +CONFIG_USB0_VBUS_PIN="AXP0-VBUS-ENABLE"
>>> +CONFIG_USB0_VBUS_DET="AXP0-VBUS-DETECT"
>>> +CONFIG_USB0_ID_DET="PH8"
>>> +CONFIG_AXP_GPIO=y
>>>
>>> +CONFIG_VIDEO_LCD_MODE="x:800,y:480,depth:18,pclk_khz:33000,le:87,ri:167,up:31,lo:13,hs:1,vs:1,sync:3,vmode:0"
>>
>>
>> FYI my q8h-v1.5 uses a slightly different mode line:
>>
>>
>> x:800,y:480,depth:18,pclk_khz:36000,le:45,ri:209,up:22,lo:22,hs:1,vs:1,sync:3,vmode:0
>
>
> Yes, there are multiple modelines floating around for 800x480 panels, I've
> 2 A13 tablets and the modeline of the fex file from tablet a causes the
> images
> to not be properly centered on the screen of tablet b. Luckily the other way
> around does work, so for the q8_a13_tablet_defconfig I'm using the modeline
> from the fex file from tablet b. I hope we can do something similar with q8
> a23 and a33 800x480 tablets.
>
> I've been buying q8 tablets with cracked screens (people seem to drop them
> quite
> a lot) for cheap from a local 2nd hand website, so now I've 5 ever so
> slightly
> different models, I still need to make a generic q8 config for those, and
> see if
> I can find a modeline which works on all of them.
>
> That modeline should probably be a good one to use for the a33 defconfig
> too.
>
>> I'll find some time to give yours a test.

So it looks like your modeline works as well. I can't see any difference
between the two on screen. Speaking of the screen, mine is slightly off
vertically. Feels like it is 1 line lower than it should be. And the right
most end displays partially under the touchscreen with either modeline.

ChenYu