Re: [PATCH 1/6] arm64: dts: rockchip: Fix rk3399-roc-pc pwm2 pin

[Jagan Teki <jagan@amarulasolutions.com>]

Hi Levin,

On Tue, Oct 8, 2019 at 8:42 AM <djw@t-chip.com.cn> wrote:
>
> Jagan Teki <jagan@amarulasolutions.com> writes:
>
> > Hi Heiko,
> >
> > On Mon, Sep 30, 2019 at 2:51 AM Heiko Stuebner <heiko@sntech.de> wrote:
> >>
> >> Hi Jagan,
> >>
> >> Am Donnerstag, 19. September 2019, 07:28:17 CEST schrieb Jagan Teki:
> >> > ROC-PC is not able to boot linux console if PWM2_d is
> >> > unattached to any pinctrl logic.
> >> >
> >> > To be precise the linux boot hang with last logs as,
> >> > ...
> >> > .....
> >> > [    0.003367] Console: colour dummy device 80x25
> >> > [    0.003788] printk: console [tty0] enabled
> >> > [    0.004178] printk: bootconsole [uart8250] disabled
> >> >
> >> > In ROC-PC the PWM2_d pin is connected to LOG_DVS_PWM of
> >> > VDD_LOG. So, for normal working operations this needs to
> >> > active and pull-down.
> >> >
> >> > This patch fix, by attaching pinctrl active and pull-down
> >> > the pwm2.
> >>
> >> This looks highly dubious on first glance. The pwm subsystem nor
> >> the Rockchip pwm driver do not do any pinctrl handling.
> >>
> >> So I don't really see where that "active" pinctrl state is supposed
> >> to come from.
> >>
> >> Comparing with the pwm driver in the vendor tree I see that there
> >> is such a state defined there. But that code there also looks strange
> >> as that driver never again leaves this active state after entering it.
> >>
> >> Also for example all the Gru devices run with quite a number of pwm-
> >> regulators without needing additional fiddling with the pwm itself, so
> >> I don't really see why that should be different here.
> >
> > I deed, I was supposed to think the same. but the vendor kernel dts
> > from firefly do follow the pwm2 pinctrl [1]. I wouldn't find any
> > information other than this vensor information, ie one of the reason I
> > have marked "Levin Du" who initially supported this board.
> >
> > One, think I have seen was this pinctrl active fixed the boot hang.
> > any inputs from would be very helpful.
> >
> > Levin Du, any inputs?
> >
> > [1] https://github.com/FireflyTeam/kernel/blob/stable-4.4-rk3399-linux/arch/arm64/boot/dts/rockchip/rk3399-roc-pc.dtsi#L1184
> >
>
> A grep of the `pwm2` shows that there's such block in rk3399-nanopi4.dtsi:
>
>     &pwm2 {
>             pinctrl-names = "active";
>             pinctrl-0 = <&pwm2_pin_pull_down>;
>             status = "okay";
>     };
>
> But last time I checked, using the mainline U-Boot (the roc-rk3399-pc is
> in mainline now) with mainline linux v5.2-rc7, no such setting is
> necessary, and the board boots happily.
>
> I cannot find the use of "active" pinctrl state in the
> `drivers/pwm/pwm-rockchip.c`. If the pinctrl state needs to be setup as
> default, the `pinctrl-names` needs to be "default" or "init" (see
> `drivers/base/pinctrl.c`) .
>
> Jagan, what version of board do you use? I checked with
> "ROC-RK3399-PC-V1.0-A 2018-07-12".

I have ROC-RK3399-PC-V1.A 2018.09.25 and powering with TYPE-C0 port.

And here the boot log

[    0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd034]
[    0.000000] Linux version 5.4.0-rc3-next-20191016
(jagan@jagan-XPS-13-9350) (gcc version 6.3.1 20170109 (Linaro GCC
6.3-2017.02)) #1 SMP PREEMPT Wed Oct 16 21:17:23 IST 2019
[    0.000000] Machine model: Firefly ROC-RK3399-PC Board
[    0.000000] earlycon: uart8250 at MMIO32 0x00000000ff1a0000 (options '')
[    0.000000] printk: bootconsole [uart8250] enabled
[    0.000000] efi: Getting EFI parameters from FDT:
[    0.000000] efi: UEFI not found.
[    0.000000] cma: Reserved 32 MiB at 0x000000003e000000
[    0.000000] NUMA: No NUMA configuration found
[    0.000000] NUMA: Faking a node at [mem
0x0000000000200000-0x00000000f7ffffff]
[    0.000000] NUMA: NODE_DATA [mem 0xf77ef100-0xf77f0fff]
[    0.000000] Zone ranges:
[    0.000000]   DMA      [mem 0x0000000000200000-0x000000003fffffff]
[    0.000000]   DMA32    [mem 0x0000000040000000-0x00000000f7ffffff]
[    0.000000]   Normal   empty
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000200000-0x00000000f7ffffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000200000-0x00000000f7ffffff]
[    0.000000] psci: probing for conduit method from DT.
[    0.000000] psci: PSCIv1.1 detected in firmware.
[    0.000000] psci: Using standard PSCI v0.2 function IDs
[    0.000000] psci: MIGRATE_INFO_TYPE not supported.
[    0.000000] psci: SMC Calling Convention v1.1
[    0.000000] percpu: Embedded 22 pages/cpu s52952 r8192 d28968 u90112
[    0.000000] Detected VIPT I-cache on CPU0
[    0.000000] CPU features: detected: ARM erratum 845719
[    0.000000] CPU features: detected: GIC system register CPU interface
[    0.000000] Speculative Store Bypass Disable mitigation not required
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 999432
[    0.000000] Policy zone: DMA32
[    0.000000] Kernel command line:
earlycon=uart8250,mmio32,0xff1a0000 root=/dev/mmcblk1p1 rootwait
[    0.000000] Dentry cache hash table entries: 524288 (order: 10,
4194304 bytes, linear)
[    0.000000] Inode-cache hash table entries: 262144 (order: 9,
2097152 bytes, linear)
[    0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[    0.000000] software IO TLB: mapped [mem 0x3a000000-0x3e000000] (64MB)
[    0.000000] Memory: 3856004K/4061184K available (12028K kernel
code, 1870K rwdata, 6440K rodata, 5056K init, 451K bss, 172412K
reserved, 32768K cma-reserved)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=6, Nodes=1
[    0.000000] rcu: Preemptible hierarchical RCU implementation.
[    0.000000] rcu:     RCU restricting CPUs from NR_CPUS=256 to nr_cpu_ids=6.
[    0.000000]  Tasks RCU enabled.
[    0.000000] rcu: RCU calculated value of scheduler-enlistment delay
is 25 jiffies.
[    0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=6
[    0.000000] NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0
[    0.000000] GICv3: GIC: Using split EOI/Deactivate mode
[    0.000000] GICv3: 256 SPIs implemented
[    0.000000] GICv3: 0 Extended SPIs implemented
[    0.000000] GICv3: Distributor has no Range Selector support
[    0.000000] GICv3: 16 PPIs implemented
[    0.000000] GICv3: no VLPI support, no direct LPI support
[    0.000000] GICv3: CPU0: found redistributor 0 region 0:0x00000000fef00000
[    0.000000] ITS [mem 0xfee20000-0xfee3ffff]
[    0.000000] ITS@0x00000000fee20000: allocated 65536 Devices
@f6880000 (flat, esz 8, psz 64K, shr 0)
[    0.000000] ITS: using cache flushing for cmd queue
[    0.000000] GICv3: using LPI property table @0x00000000f6840000
[    0.000000] GIC: using cache flushing for LPI property table
[    0.000000] GICv3: CPU0: using allocated LPI pending table
@0x00000000f6850000
[    0.000000] GICv3: GIC: PPI partition interrupt-partition-0[0] {
/cpus/cpu@0[0] /cpus/cpu@1[1] /cpus/cpu@2[2] /cpus/cpu@3[3] }
[    0.000000] GICv3: GIC: PPI partition interrupt-partition-1[1] {
/cpus/cpu@100[4] /cpus/cpu@101[5] }
[    0.000000] random: get_random_bytes called from
start_kernel+0x2b8/0x454 with crng_init=0
[    0.000000] arch_timer: cp15 timer(s) running at 24.00MHz (phys).
[    0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff
max_cycles: 0x588fe9dc0, max_idle_ns: 440795202592 ns
[    0.000006] sched_clock: 56 bits at 24MHz, resolution 41ns, wraps
every 4398046511097ns
[    0.003201] Console: colour dummy device 80x25
[    0.003624] printk: console [tty0] enabled
[    0.004020] printk: bootconsole [uart8250] disabled

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