Re: PROBLEM: [drm:analogix_dp_bridge_atomic_enable [analogix_dp]] *ERROR* Failed to disable psr -110

["Milan P. Stanić" <mps-OV3VlZ6014XR7s880joybQ@public.gmane.org>]

Hi,

On Fri, 2020-04-10 at 08:28, Doug Anderson wrote:
> Hi,
> 
> On Fri, Apr 10, 2020 at 5:56 AM Enric Balletbo Serra
> <eballetbo-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >
> > Hi Milan,
> >
> > Right, this is an annoying issue but also known, unfortunately, I
> > personally didn't have time to look at. but it is in my TODO.
> 
> Random shot in the dark, but any chance somehow your PHY clock and
> PCLK for the eDP don't match?  If they don't then (IIRC) you'll get
> random failures to access eDP registers.
> 
> Some history in <https://crrev.com/c/433393>.  It looks like the
> changes in that patch are upstream but if something else happened to
> make your PHY and PCLK mismatch it could cause similar symptoms.
> 
> ...of course it's always possible (probable) that it's something
> different, but since that was such a weird and hard-to-track-down
> problem I figured I'd at least make sure it wasn't that.

Not sure I understood (I'm not graphic hardware programmer) but I
changed arch/arm64/boot/dts/rockchip/rk3399.dtsi file around line
1367 (current mainline kernel), this:
    assigned-clocks =
      <&cru PLL_GPLL>, <&cru PLL_CPLL>,
      <&cru PLL_NPLL>,
      <&cru ACLK_PERIHP>, <&cru HCLK_PERIHP>,
      <&cru PCLK_PERIHP>,
      <&cru ACLK_PERILP0>, <&cru HCLK_PERILP0>,
      <&cru PCLK_PERILP0>, <&cru ACLK_CCI>,
      <&cru HCLK_PERILP1>, <&cru PCLK_PERILP1>,
      <&cru ACLK_VIO>, <&cru ACLK_HDCP>,
      <&cru ACLK_GIC_PRE>,
      <&cru PCLK_DDR>;
    assigned-clock-rates =
       <594000000>,  <800000000>,
      <1000000000>,
       <150000000>,   <75000000>,
        <37500000>,
       <100000000>,  <100000000>,
        <50000000>, <600000000>,
       <100000000>,   <50000000>,
       <400000000>, <400000000>,
       <200000000>,
       <200000000>;

and changed  <594000000> to  <600000000>
build kernel and it boots but display is blank after boot.

TIA
> -Doug