Hi Lucas, Thanks for your feedback. On Tue, 2024-04-09 at 11:13 +0200, Lucas Stach wrote: > Hi Vitor, > > Am Dienstag, dem 09.04.2024 um 09:58 +0100 schrieb Vitor Soares: > > From: Vitor Soares <vitor.soares@xxxxxxxxxxx> > > > > The pgc_vpu_* nodes miss the reference to the power domain parent, > > leading the system to hang during the resume. > > > This change is not correct. The vpumix domain is controlled through > the > imx8mm-vpu-blk-ctrl and must not be directly triggered by the child > domains in order to guarantee proper power sequencing. > > If the sequencing is incorrect for resume, it needs to be fixed in > the > blk-ctrl driver. I'll happily assist if you have any questions about > this intricate mix between GPC and blk-ctrl hardware/drivers. I'm new into the topic, so I tried to follow same approach as in imx8mp DT. I also checked the imx8mq DT and it only have one domain for the VPU in the GPC. It seem blk-ctrl also dependes on pgc_vpu_* to work properly. The blk-ctrl driver hangs on imx8m_blk_ctrl_power_on() when access the ip registers for the soft reset. I tried to power-up the before the soft reset, but it didn't work. Do you have an idea how we can address this within blk-ctrl? Best regards, Vitor > > Regards, > Lucas > > > As these PU domains are nested inside the vpumix domain, let's > > reference > > it accordingly. After this change, the suspend/resume is working. > > > > Cc: Lucas Stach <l.stach@xxxxxxxxxxxxxx> > > Cc: <stable@xxxxxxxxxxxxxxx> > > Closes: > > https://lore.kernel.org/all/fccbb040330a706a4f7b34875db1d896a0bf81c8.camel@xxxxxxxxx/ > > Fixes: d39d4bb15310 ("arm64: dts: imx8mm: add GPC node") > > Signed-off-by: Vitor Soares <vitor.soares@xxxxxxxxxxx> > > --- > > arch/arm64/boot/dts/freescale/imx8mm.dtsi | 3 +++ > > 1 file changed, 3 insertions(+) > > > > diff --git a/arch/arm64/boot/dts/freescale/imx8mm.dtsi > > b/arch/arm64/boot/dts/freescale/imx8mm.dtsi > > index 8a1b42b94dce..97d0c6d23ad8 100644 > > --- a/arch/arm64/boot/dts/freescale/imx8mm.dtsi > > +++ b/arch/arm64/boot/dts/freescale/imx8mm.dtsi > > @@ -739,16 +739,19 @@ pgc_vpumix: power-domain@6 { > > pgc_vpu_g1: power-domain@7 > > { > > #power-domain-cells > > = <0>; > > reg = > > <IMX8MM_POWER_DOMAIN_VPUG1>; > > + power-domains = > > <&pgc_vpumix>; > > }; > > > > pgc_vpu_g2: power-domain@8 > > { > > #power-domain-cells > > = <0>; > > reg = > > <IMX8MM_POWER_DOMAIN_VPUG2>; > > + power-domains = > > <&pgc_vpumix>; > > }; > > > > pgc_vpu_h1: power-domain@9 > > { > > #power-domain-cells > > = <0>; > > reg = > > <IMX8MM_POWER_DOMAIN_VPUH1>; > > + power-domains = > > <&pgc_vpumix>; > > }; > > > > pgc_dispmix: > > power-domain@10 { >
