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Date:   Tue, 24 Apr 2018 15:11:26 +0200
From:   Jakob Unterwurzacher <jakob.unterwurzacher@...obroma-systems.com>
To:     JeffyChen <jeffy.chen@...k-chips.com>,
        linux-kernel@...r.kernel.org, Joerg Roedel <jroedel@...e.de>,
        linux-rockchip@...ts.infradead.org
Cc:     klaus.goger@...obroma-systems.com
Subject: Re: [regression, bisected] rockchip rk3399 video output breakage

On 24.04.18 14:37, JeffyChen wrote:
> 
> right, i think it's a known issue, as the iommu failed to get clks:
> [    1.525153] rk_iommu ff8f3f00.iommu: Failed to get clk 'iface': -2
> [    1.525316] rk_iommu: probe of ff8f3f00.iommu failed with error -2
> [    1.525484] rk_iommu ff903f00.iommu: Failed to get clk 'iface': -2
> [    1.525643] rk_iommu: probe of ff903f00.iommu failed with error -2
> 
> 
> there's a followed patch to add those clks to the dtsi, and also a fix 
> patch to make those clks optional(by heiko):
> 
> https://www.spinics.net/lists/arm-kernel/msg645696.html
> 
> http://lists.infradead.org/pipermail/linux-rockchip/2018-April/020349.html

Thanks, I tested both, and both get the screen to display some kernel 
output!

However, I am getting some nasty error messages and the screen seems to 
refresh only once every 30 seconds:

> [   15.586502] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [CRTC:30:crtc-0] flip_done timed out
> [   25.826490] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [CONNECTOR:37:HDMI-A-1] flip_done timed out
> [   36.066490] [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [PLANE:28:plane-0] flip_done timed out
> [   36.066504] [drm:drm_calc_timestamping_constants] crtc 30: hwmode: htotal 2200, vtotal 1125, vdisplay 1080
> [   36.066508] [drm:drm_calc_timestamping_constants] crtc 30: clock 148500 kHz framedur 16666666 linedur 14814
> [   36.076535] rockchip-vop ff8f0000.vop: [drm:vop_crtc_atomic_flush] *ERROR* VOP vblank IRQ stuck for 10 ms
> [   36.076577] WARNING: CPU: 1 PID: 83 at drivers/gpu/drm/rockchip/rockchip_drm_vop.c:1004 vop_crtc_atomic_flush+0x1c0/0x1c8

Full dmesg with patch "arm64: dts: rockchip: add clocks in iommu nodes":
https://gist.github.com/jakob-tsd/3fd49894d52dcd8a409eb9e6136b2d39

Full dmesg with patch "iommu/rockchip: make clock handling optional":
https://gist.github.com/jakob-tsd/da96572a40d11f0f6dff3ee481098138 
(looks the same)

Thanks,
Jakob

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