linux-kernel - Re: [PATCH v4 4/4] arm64: dts: rk3399-pinephone-pro: Add internal display support

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Date:   Sat, 31 Dec 2022 16:29:49 +0100
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     Ondřej Jirman <megi@....cz>,
        linux-kernel@...r.kernel.org,
        Kamil Trzciński <ayufan@...fan.eu>,
        Martijn Braam <martijn@...xit.nl>,
        Sam Ravnborg <sam@...nborg.org>,
        Robert Mader <robert.mader@...teo.de>,
        Tom Fitzhenry <tom@...-fitzhenry.me.uk>,
        Peter Robinson <pbrobinson@...il.com>,
        Onuralp Sezer <thunderbirdtr@...oraproject.org>,
        dri-devel@...ts.freedesktop.org,
        Maya Matuszczyk <maccraft123mc@...il.com>,
        Neal Gompa <ngompa13@...il.com>,
        linux-arm-kernel@...ts.infradead.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Jagan Teki <jagan@...rulasolutions.com>,
        Caleb Connolly <kc@...tmarketos.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH v4 4/4] arm64: dts: rk3399-pinephone-pro: Add internal
 display support

Hello Ondřej,

Thanks a lot for your feedback.

On 12/30/22 16:37, Ondřej Jirman wrote:

[...]

>>  &i2c0 {
>>  	clock-frequency = <400000>;
>>  	i2c-scl-rising-time-ns = <168>;
>> @@ -214,6 +251,9 @@ vcc3v0_touch: LDO_REG2 {
>>  				regulator-name = "vcc3v0_touch";
>>  				regulator-min-microvolt = <3000000>;
>>  				regulator-max-microvolt = <3000000>;
>> +				regulator-state-mem {
>> +					regulator-off-in-suspend;
>> +				};
> 
> You're instructing RK818 to shut down the regulator for touch controller during
> suspend, but I think Goodix driver expects touch controller to be kept powered on
> during suspend. Am I missing something?
> 
> https://elixir.bootlin.com/linux/latest/source/drivers/input/touchscreen/goodix.c#L1405
>

You tell me, it is your patch :) I just cherry-picked this from your tree:

https://github.com/megous/linux/commit/11f8da60d6a5

But if that is not correct, then I can drop the regulator-off-in-suspend.
 
[...]

>> +
>> +	touchscreen@14 {
>> +		compatible = "goodix,gt917s";
> 
> This is not the correct compatible. Pinephone Pro uses Goodix GT1158:
> 
> Goodix-TS 3-0014: ID 1158, version: 0100
> Goodix-TS 3-0014: Direct firmware load for goodix_1158_cfg.bin failed with error -2
> 
>

Same thing. I wasn't aware of this since your patch was using this compatible
string. If "goodix,gt1158" is the correct compatible string, then I agree we
should have that instead even when the firmware is missing. Because the DT is
supposed to describe the hardware. The FW issue can be tackled as a follow-up.

[...] 

>> +
>> +&vopb {
>> +	status = "okay";
>> +	assigned-clocks = <&cru DCLK_VOP0_DIV>, <&cru DCLK_VOP0>,
>> +			  <&cru ACLK_VOP0>, <&cru HCLK_VOP0>;
>> +	assigned-clock-rates = <0>, <0>, <400000000>, <100000000>;
>> +	assigned-clock-parents = <&cru PLL_CPLL>, <&cru DCLK_VOP0_FRAC>;
>> +};
> 
> So here you're putting a fractional clock into path between CPLL -> VOP0_DIV
> -> DCLK_VOP0_FRAC -> DCLK_VOP0.
> 
> Fractional clocks require 20x difference between input and output rates, and
> CPLL is 800Mhz IIRC, while you require 74.25MHz DCLK, so this will not work
> correctly.
> 
> Even if this somehow works by fractional clock being bypassed, I did not design
> the panel mode to be used with CPLL's 800 MHz, but with GPLL frequecy of 594 MHz.
> 
> GPLL 594/74.25 = 8  (integral divider without the need for fractional clock)
> CPLL 800/74.25 = ~10.77441077441077441077
> 
> If you really want to use fractional clock, you'd need to parent it to VPLL
> and set VPLL really high, like close to 2GHz.
>

Thanks for the explanation. Then I just need to squash on top of this, the
following patch. Is that correct?

https://github.com/megous/linux/commit/f19ce7bb7d72

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat