Re: [PATCH v4 0/16] Add Analogix Core Display Port Driver

[Yakir Yang <ykk@rock-chips.com>]

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Hi Heiko,

On 09/02/2015 10:15 AM, Yakir Yang wrote:
> Hi Heiko,
>
> 在 09/02/2015 05:47 AM, Heiko Stuebner 写道:
>> Hi Yakir,
>>
>> Am Dienstag, 1. September 2015, 13:46:11 schrieb Yakir Yang:
>>>     The Samsung Exynos eDP controller and Rockchip RK3288 eDP 
>>> controller
>>> share the same IP, so a lot of parts can be re-used. I split the common
>>> code into bridge directory, then rk3288 and exynos only need to keep
>>> some platform code. Cause I can't find the exact IP name of exynos dp
>>> controller, so I decide to name dp core driver with "analogix" which I
>>> find in rk3288 eDP TRM ;)
>>>
>>> Beyond that, there are three light registers setting differents bewteen
>>> exynos and rk3288.
>>> 1. RK3288 have five special pll resigters which not indicata in exynos
>>>     dp controller.
>>> 2. The address of DP_PHY_PD(dp phy power manager register) are 
>>> different
>>>     between rk3288 and exynos.
>>> 3. Rk3288 and exynos have different setting with AUX_HW_RETRY_CTL(dp 
>>> debug
>>>     register).
>>>
>>> I have verified this series on two kinds of rockchip platform board, 
>>> one
>>> is rk3288 sdk board which connect with a 2K display port monitor, 
>>> the other
>>> is google jerry chromebook which connect with a eDP screen 
>>> "cnm,n116bgeea2",
>>> both of them works rightlly.
>> it looks like during the rebase something did go wrong and I found 
>> some issues
>> I mentioned in the replies to individual patches.
>>
>> I did prepare a branch based on mainline [0] with both the old and 
>> the new edp
>> driver - rk3288_veyron_defconfig build both drivers into the image.
>>
>> While the old driver still works, I wasn't able to make the new one 
>> work yet
>> ... the drm core does find the connector, but not that anything is 
>> connected
>> to it. I'll try to dig deeper tomorrow, but maybe you'll see anything
>> interesting before then.
>
> Many thanks for your comment and debug, I would rebase on your
> "edp-with-veyron" branch and fix the broken, make sure v6 would
> work rightly at least in your side and my side.

Just like we talk off line, I guess there are two tricky questions which 
make analogix_dp just crash/failed on rockchip platform:

-  One is how to reach a agreement with the common way to register 
connector. There would be a conflict with Exynos & IMX & Rockchip.
      On analogix_dp thread, Exynos want to register connector when that 
connector is ready.
      On dw_hdmi thread, IMX want to register connector when all 
component is already.
      So Exynos & IMX & Rockchip should reach a common way to register 
connector to fix this issue.

-  The other is atomic API.
       The rockchip drm haven't implemented the atomic API, but the 
original exynos_dp have used the atomic API on connector helper 
function. That's why analogix_dp just keep crash on your side.

I have prepared the v5 version, although those would work directly on 
rockchip side, but I could upload some HACK patches to gerrit  to make 
this works,  hope we can keep the discussion going forward.

Thanks,
- Yakir

>
> - Yakir
>
>>
>> Heiko
>>
>> [0] https://github.com/mmind/linux-rockchip/tree/tmp/edp-with-veyron
>>
>>
>>
>>
>
>
>
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