Hi, On Fri, Apr 10, 2020 at 12:29 PM Milan P. Stanić <mps@xxxxxxxxxxx> wrote: > > 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@xxxxxxxxx> 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. I think kevin already overrides those clocks in its dts. I was more thinking of looking at "/sys/kernel/debug/clk/clk_summary" and seeing if there was a clock mismatch. -Doug _______________________________________________ Linux-rockchip mailing list Linux-rockchip@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/linux-rockchip
