linux-kernel - Re: [PATCH] mfd: rk808: Always use poweroff when requested

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Date:   Wed, 11 Dec 2019 07:30:15 +0530
From:   Anand Moon <linux.amoon@...il.com>
To:     Soeren Moch <smoch@....de>
Cc:     Markus Reichl <m.reichl@...etechno.de>,
        linux-rockchip@...ts.infradead.org,
        Lee Jones <lee.jones@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mfd: rk808: Always use poweroff when requested

hi Soeren,

On Tue, 10 Dec 2019 at 22:10, Soeren Moch <smoch@....de> wrote:
>
>
>
> On 10.12.19 13:55, Markus Reichl wrote:
> > Hi Anand,
> >
> > Am 10.12.19 um 13:42 schrieb Anand Moon:
> >> Hi Soeren,
> >>
> >> On Mon, 9 Dec 2019 at 17:28, Soeren Moch <smoch@....de> wrote:
> >>>
> >>> With the device tree property "rockchip,system-power-controller" we
> >>> explicitly request to use this PMIC to power off the system. So always
> >>> register our poweroff function, even if some other handler (probably
> >>> PSCI poweroff) was registered before.
> >>>
> >>> Signed-off-by: Soeren Moch <smoch@....de>
> >>> ---
> >>> Cc: Lee Jones <lee.jones@...aro.org>
> >>> Cc: Heiko Stuebner <heiko@...ech.de>
> >>> Cc: linux-arm-kernel@...ts.infradead.org
> >>> Cc: linux-rockchip@...ts.infradead.org
> >>> Cc: linux-kernel@...r.kernel.org
> >>> ---
> >>>  drivers/mfd/rk808.c | 11 ++---------
> >>>  1 file changed, 2 insertions(+), 9 deletions(-)
> >>>
> >>> diff --git a/drivers/mfd/rk808.c b/drivers/mfd/rk808.c
> >>> index a69a6742ecdc..616e44e7ef98 100644
> >>> --- a/drivers/mfd/rk808.c
> >>> +++ b/drivers/mfd/rk808.c
> >>> @@ -550,7 +550,7 @@ static int rk808_probe(struct i2c_client *client,
> >>>         const struct mfd_cell *cells;
> >>>         int nr_pre_init_regs;
> >>>         int nr_cells;
> >>> -       int pm_off = 0, msb, lsb;
> >>> +       int msb, lsb;
> >>>         unsigned char pmic_id_msb, pmic_id_lsb;
> >>>         int ret;
> >>>         int i;
> >>> @@ -674,16 +674,9 @@ static int rk808_probe(struct i2c_client *client,
> >>>                 goto err_irq;
> >>>         }
> >>>
> >>> -       pm_off = of_property_read_bool(np,
> >>> -                               "rockchip,system-power-controller");
> >>> -       if (pm_off && !pm_power_off) {
> >>> +       if (of_property_read_bool(np,
> >>> "rockchip,system-power-controller")) {
> >>>                 rk808_i2c_client = client;
> >>>                 pm_power_off = rk808->pm_pwroff_fn;
> >>> -       }
> >>> -
> >>> -       if (pm_off && !pm_power_off_prepare) {
> >>> -               if (!rk808_i2c_client)
> >>> -                       rk808_i2c_client = client;
> >>>                 pm_power_off_prepare = rk808->pm_pwroff_prep_fn;
> >>>         }
> >>>
> >>
> >> I gave this a try on my Rock960 and Odroid N1
> >> both got kernel panic below.
> >
> > I see the same on rk3399-roc-pc.
> This is no panic, it's a harmless warning.

Ok but my device do not come up cleanly after that, it get stuck in
u-boot in next boot.

> The i2c core nowadays expects a specially marked i2c transfer function
> late in the powerdown cycle:

You can look into similar commit.
d785334a0d5deff30a487c74324b842d2179553d (mfd: s2mps11: Add manual
shutdown method for Odroid XU3)

>
> diff --git a/drivers/i2c/busses/i2c-rk3x.c b/drivers/i2c/busses/i2c-rk3x.c
> index 1a33007b03e9..cec115e0afa4 100644
> --- a/drivers/i2c/busses/i2c-rk3x.c
> +++ b/drivers/i2c/busses/i2c-rk3x.c
> @@ -1126,6 +1126,7 @@ static u32 rk3x_i2c_func(struct i2c_adapter *adap)
>
>  static const struct i2c_algorithm rk3x_i2c_algorithm = {
>      .master_xfer        = rk3x_i2c_xfer,
> +    .master_xfer_atomic    = rk3x_i2c_xfer, /* usable for PMIC poweroff */
>      .functionality        = rk3x_i2c_func,
>  };
>
> ---
> It is only used for powerdown. The regular i2c xfer function works.
>
> Heiko, should I send a formal patch for that?
>
> Soeren
>
> >
> >>
> >> [   58.305868] xhci-hcd xhci-hcd.0.auto: USB bus 5 deregistered
> >> [   58.306747] reboot: Power down
> >> [   58.307106] ------------[ cut here ]------------
> >> [   58.307510] No atomic I2C transfer handler for 'i2c-0'
> >> [   58.308007] WARNING: CPU: 0 PID: 1 at drivers/i2c/i2c-core.h:41
> >> i2c_transfer+0xe4/0xf8
> >> [   58.308696] Modules linked in: snd_soc_hdmi_codec dw_hdmi_i2s_audio
> >> rockchipdrm analogix_dp brcmfmac nvme dw_mipi_dsi nvme_core dw_hdmi
> >> panfrost cec brcmutil drm_kms_helper gpu_sched cfg80211 hci_uart drm
> >> btbcm crct10dif_ce snd_soc_simple_card bluetooth snd_soc_rockchip_i2s
> >> snd_soc_simple_card_utils snd_soc_rockchip_pcm phy_rockchip_pcie
> >> ecdh_generic rtc_rk808 ecc pcie_rockchip_host rfkill rockchip_thermal
> >> ip_tables x_tables ipv6 nf_defrag_ipv6
> >> [   58.312150] CPU: 0 PID: 1 Comm: shutdown Not tainted
> >> 5.5.0-rc1-dirty #1
> >> [   58.312725] Hardware name: 96boards Rock960 (DT)
> >> [   58.313131] pstate: 60000085 (nZCv daIf -PAN -UAO)
> >> [   58.313551] pc : i2c_transfer+0xe4/0xf8
> >> [   58.313889] lr : i2c_transfer+0xe4/0xf8
> >> [   58.314225] sp : ffff80001004bb00
> >> [   58.314516] x29: ffff80001004bb00 x28: ffff00007d208000
> >> [   58.314981] x27: 0000000000000000 x26: 0000000000000000
> >> [   58.315446] x25: 0000000000000000 x24: 0000000000000008
> >> [   58.315910] x23: 0000000000000000 x22: ffff80001004bc74
> >> [   58.316375] x21: 0000000000000002 x20: ffff80001004bb58
> >> [   58.316841] x19: ffff0000784f0880 x18: 0000000000000010
> >> [   58.317305] x17: 0000000000000001 x16: 0000000000000019
> >> [   58.317770] x15: ffffffffffffffff x14: ffff8000118398c8
> >> [   58.318236] x13: ffff80009004b867 x12: ffff80001004b86f
> >> [   58.318701] x11: ffff800011851000 x10: ffff80001004b7f0
> >> [   58.319166] x9 : 00000000ffffffd0 x8 : ffff800010699ad8
> >> [   58.319631] x7 : 0000000000000265 x6 : ffff800011a20be9
> >> [   58.320096] x5 : 0000000000000000 x4 : 0000000000000000
> >> [   58.320561] x3 : 00000000ffffffff x2 : ffff800011851ab8
> >> [   58.321026] x1 : d375c0d4f4751f00 x0 : 0000000000000000
> >> [   58.321491] Call trace:
> >> [   58.321710]  i2c_transfer+0xe4/0xf8
> >> [   58.322020]  regmap_i2c_read+0x5c/0x98
> >> [   58.322350]  _regmap_raw_read+0xcc/0x138
> >> [   58.322694]  _regmap_bus_read+0x3c/0x70
> >> [   58.323034]  _regmap_read+0x60/0xe0
> >> [   58.323341]  _regmap_update_bits+0xc8/0x108
> >> [   58.323707]  regmap_update_bits_base+0x60/0x90
> >> [   58.324099]  rk808_device_shutdown+0x38/0x50
> >> [   58.324476]  machine_power_off+0x24/0x30
> >> [   58.324823]  kernel_power_off+0x64/0x70
> >> [   58.325159]  __do_sys_reboot+0x15c/0x240
> >> [   58.325504]  __arm64_sys_reboot+0x20/0x28
> >> [   58.325858]  el0_svc_common.constprop.2+0x88/0x150
> >> [   58.326279]  el0_svc_handler+0x20/0x80
> >> [   58.326607]  el0_sync_handler+0x118/0x188
> >> [   58.326960]  el0_sync+0x140/0x180
> >> [   58.327251] ---[ end trace b1de39d03d724d01 ]---
> >>
> >> -Anand
> >>
> >> _______________________________________________
> >> Linux-rockchip mailing list
> >> Linux-rockchip@...ts.infradead.org
> >> http://lists.infradead.org/mailman/listinfo/linux-rockchip
> >>
> >
> > Gruß,
>
-Anand

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