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SubjectRe: [PATCH] mfd: rk808: Always use poweroff when requested
hi Soeren,

On Tue, 10 Dec 2019 at 22:10, Soeren Moch <smoch@web.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@web.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@web.de>
> >>> ---
> >>> Cc: Lee Jones <lee.jones@linaro.org>
> >>> Cc: Heiko Stuebner <heiko@sntech.de>
> >>> Cc: linux-arm-kernel@lists.infradead.org
> >>> Cc: linux-rockchip@lists.infradead.org
> >>> Cc: linux-kernel@vger.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@lists.infradead.org
> >> http://lists.infradead.org/mailman/listinfo/linux-rockchip
> >>
> >
> > Gruß,
>
-Anand

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