[REGRESSION][BISECTED] No display on rk3399-gru-kevin

[REGRESSION][BISECTED] No display on rk3399-gru-kevin

[Vicente Bergas]

Hello,
there are two issues that result on a black screen on the rk3399-gru-kevin.

The first one is due to:
c8079f83e0bf312645050c17d9c87deb707369c1
gpio: rockchip: convert to dynamic GPIO base allocation

Reverting this does not fix the problem as there is a second one:
51eb548ade20158b4f4f8693a95b1f31a2480e8e
drm/bridge: analogix_dp: Apply DP helper API drm_dp_channel_eq_ok()

That second one depends on:
d84b087c7662dd65cd51b228219987c31b1cee02
drm/bridge: analogix_dp: Apply DP helper APIs to get adjusted voltages
and pre-emphasises

Reverting all three commits from v7.1 make the display work again.

Please, can this be resolved?

Regards,
  Vicente.

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Re: [REGRESSION][BISECTED] No display on rk3399-gru-kevin

[Damon Ding]

Hi Vicente,

On 6/17/2026 7:05 AM, Vicente Bergas wrote:
> Hello,
> there are two issues that result on a black screen on the rk3399-gru-kevin.
> 
> The first one is due to:
> c8079f83e0bf312645050c17d9c87deb707369c1
> gpio: rockchip: convert to dynamic GPIO base allocation
> 
> Reverting this does not fix the problem as there is a second one:
> 51eb548ade20158b4f4f8693a95b1f31a2480e8e
> drm/bridge: analogix_dp: Apply DP helper API drm_dp_channel_eq_ok()
> 
> That second one depends on:
> d84b087c7662dd65cd51b228219987c31b1cee02
> drm/bridge: analogix_dp: Apply DP helper APIs to get adjusted voltages
> and pre-emphasises
> 
> Reverting all three commits from v7.1 make the display work again.
> 
> Please, can this be resolved?
> 

These two issues appear to come from entirely distinct subsystems. Could 
you share the related error logs so I can analyze them further?

Additionally, I will set up an RK3399 EVB1 environment locally to 
reproduce and verify this issue later.

Best regards,
Damon


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Re: [REGRESSION][BISECTED] No display on rk3399-gru-kevin

[Heiko Stübner]

Hi Vicente,

Am Mittwoch, 17. Juni 2026, 01:05:27 Mitteleuropäische Sommerzeit schrieb Vicente Bergas:
> Hello,
> there are two issues that result on a black screen on the rk3399-gru-kevin.
> 
> The first one is due to:
> c8079f83e0bf312645050c17d9c87deb707369c1
> gpio: rockchip: convert to dynamic GPIO base allocation

can you check that your kernel contains
"gpio: rockchip: Fix GPIO regression after conversion to dynamic base allocation"
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=5cd9c6d332f46d1de8b68117fe2a3f1b08ee80ff


> Reverting this does not fix the problem as there is a second one:
> 51eb548ade20158b4f4f8693a95b1f31a2480e8e
> drm/bridge: analogix_dp: Apply DP helper API drm_dp_channel_eq_ok()
> 
> That second one depends on:
> d84b087c7662dd65cd51b228219987c31b1cee02
> drm/bridge: analogix_dp: Apply DP helper APIs to get adjusted voltages
> and pre-emphasises
> 
> Reverting all three commits from v7.1 make the display work again.
> 
> Please, can this be resolved?

and as Damon wrote, please provide logs, so we can see the actual problem


Thanks
Heiko



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