> Am 11.09.2019 um 08:03 schrieb H. Nikolaus Schaller <hns@xxxxxxxxxxxxx>: > > >> Am 11.09.2019 um 07:13 schrieb H. Nikolaus Schaller <hns@xxxxxxxxxxxxx>: >> >> Hi Adam, >> >>> Am 11.09.2019 um 02:41 schrieb Adam Ford <aford173@xxxxxxxxx>: >>>>>> >> >>>>>> The error message looks as if we have to enable multi_regulator. >> >>>>> >>>>> That will enable both vdd and vbb regulators from what I can tell in the driver. >>>>> >>>>>> And that may need to rename cpu0-supply to vdd-supply (unless the >>>>>> names can be configured). >>>>> >>>>> That is consistent with what I found. vdd-supply = <&vcc>; and >>>>> vbb-supply = <&abb_mpu_iva>; >>>>> I put them both under the cpu node. Unfortunately, when I did that, >>>>> my board crashed. >>>>> >>>>> I am thinking it has something to do with the abb_mpu_iva driver >>>>> because until this point, we've always operated at 800MHz or lower >>>>> which all have the same behavior in abb_mpu_iva. >>>>> >>>>> With the patch you posted for the regulator, without the update to >>>>> cpufreq, and with debugging enabled, I received the following in >>>>> dmesg: >>>>> >>>>> [ 1.112518] ti_abb 483072f0.regulator-abb-mpu: Missing >>>>> 'efuse-address' IO resource >>>>> [ 1.112579] ti_abb 483072f0.regulator-abb-mpu: [0]v=1012500 ABB=0 >>>>> ef=0x0 rbb=0x0 fbb=0x0 vset=0x0 >>>>> [ 1.112609] ti_abb 483072f0.regulator-abb-mpu: [1]v=1200000 ABB=0 >>>>> ef=0x0 rbb=0x0 fbb=0x0 vset=0x0 >>>>> [ 1.112609] ti_abb 483072f0.regulator-abb-mpu: [2]v=1325000 ABB=0 >>>>> ef=0x0 rbb=0x0 fbb=0x0 vset=0x0 >>>>> [ 1.112640] ti_abb 483072f0.regulator-abb-mpu: [3]v=1375000 ABB=1 >>>>> ef=0x0 rbb=0x0 fbb=0x0 vset=0x0 >>>>> [ 1.112731] ti_abb 483072f0.regulator-abb-mpu: ti_abb_init_timings: >>>>> Clk_rate=13000000, sr2_cnt=0x00000032 >>>>> >>>> >>>> Using an unmodified kernel, I changed the device tree to make the abb >>>> regulator power the cpu instead of vcc. After doing so, I was able to >>>> read the microvolt value, and it matched the processor's desired OPP >>>> voltage, and the debug code showed the abb regulator was attempting to >>>> set the various index based on the needed voltage. I think the abb >>>> driver is working correctly. >>>> >>>> I think tomorrow, I will re-apply the patches and tweak it again to >>>> support both vdd and vbb regulators. If it crashes again, I'll look >>>> more closely at the logs to see if I can determine why. I think it's >>>> pretty close. I also need to go back and find the SmartReflex stuff >>>> as well. >>>> >>> Well, I couldn't give it up for the night, so I thought I'd show my data dump >>> >>> [ 9.807647] ------------[ cut here ]------------ >>> [ 9.812469] WARNING: CPU: 0 PID: 68 at drivers/opp/core.c:630 >>> dev_pm_opp_set_rate+0x3cc/0x480 >>> [ 9.821044] Modules linked in: sha256_generic sha256_arm cfg80211 >>> joydev mousedev evdev snd_soc_omap_twl4030(+) leds_gpio led_class >>> panel_simple pwm_omap_dmtimer gpio_keys pwm_bl cpufreq_dt omap3_isp v >>> ideobuf2_dma_contig videobuf2_memops videobuf2_v4l2 videobuf2_common >>> bq27xxx_battery_hdq v4l2_fwnode snd_soc_omap_mcbsp bq27xxx_battery >>> snd_soc_ti_sdma omap_wdt videodev mc omap_hdq wlcore_sdio wire cn ph >>> y_twl4030_usb hwmon omap2430 musb_hdrc omap_mailbox twl4030_wdt >>> watchdog udc_core rtc_twl snd_soc_twl4030 ohci_platform(+) >>> snd_soc_core snd_pcm_dmaengine ohci_hcd snd_pcm ehci_omap(+) >>> twl4030_pwrbutton sn >>> d_timer twl4030_charger snd pwm_twl_led pwm_twl ehci_hcd industrialio >>> soundcore twl4030_keypad matrix_keymap usbcore at24 tsc2004 >>> tsc200x_core usb_common omap_ssi hsi omapdss omapdss_base drm >>> drm_panel_or >>> ientation_quirks cec >>> [ 9.894470] CPU: 0 PID: 68 Comm: kworker/0:2 Not tainted >>> 5.3.0-rc3-00785-gfdfc7f21c6b7-dirty #5 >>> [ 9.903198] Hardware name: Generic OMAP36xx (Flattened Device Tree) >>> [ 9.909515] Workqueue: events dbs_work_handler >>> [ 9.914031] [<c01122d8>] (unwind_backtrace) from [<c010c8b8>] >>> (show_stack+0x10/0x14) >>> [ 9.921813] [<c010c8b8>] (show_stack) from [<c089e858>] >>> (dump_stack+0xb4/0xd4) >>> [ 9.929107] [<c089e858>] (dump_stack) from [<c0139eb0>] >>> (__warn.part.3+0xa8/0xd4) >>> [ 9.936614] [<c0139eb0>] (__warn.part.3) from [<c013a034>] >>> (warn_slowpath_null+0x40/0x4c) >>> [ 9.944854] [<c013a034>] (warn_slowpath_null) from [<c06d666c>] >>> (dev_pm_opp_set_rate+0x3cc/0x480) >>> [ 9.953796] [<c06d666c>] (dev_pm_opp_set_rate) from [<bf1790ac>] >>> (set_target+0x30/0x58 [cpufreq_dt]) >>> [ 9.963012] [<bf1790ac>] (set_target [cpufreq_dt]) from >>> [<c06db05c>] (__cpufreq_driver_target+0x188/0x514) >>> [ 9.972717] [<c06db05c>] (__cpufreq_driver_target) from >>> [<c06de050>] (od_dbs_update+0x130/0x15c) >>> [ 9.981567] [<c06de050>] (od_dbs_update) from [<c06deb08>] >>> (dbs_work_handler+0x28/0x58) >>> [ 9.989624] [<c06deb08>] (dbs_work_handler) from [<c0154ab0>] >>> (process_one_work+0x20c/0x500) >>> [ 9.998107] [<c0154ab0>] (process_one_work) from [<c0155e8c>] >>> (worker_thread+0x2c/0x5bc) >>> [ 10.006256] [<c0155e8c>] (worker_thread) from [<c015ab88>] >>> (kthread+0x134/0x148) >>> [ 10.013702] [<c015ab88>] (kthread) from [<c01010e8>] >>> (ret_from_fork+0x14/0x2c) >>> [ 10.020965] Exception stack(0xde63bfb0 to 0xde63bff8) >>> [ 10.026062] bfa0: 00000000 >>> 00000000 00000000 00000000 >>> [ 10.034271] bfc0: 00000000 00000000 00000000 00000000 00000000 >>> 00000000 00000000 00000000 >>> [ 10.042510] bfe0: 00000000 00000000 00000000 00000000 00000013 00000000 >>> [ 10.049224] ---[ end trace cf0e15fa4bd57700 ]--- >>> [ 10.053894] cpu cpu0: multiple regulators are not supported >>> [ 10.059509] cpufreq: __target_index: Failed to change cpu frequency: -22 >> >> I have the same: >> >> [ 4.701354] cpu cpu0: multiple regulators are not supported >> [ 4.707794] cpufreq: __target_index: Failed to change cpu frequency: -22 >> >> Comes from within dev_pm_opp_set_rate(). >> >> It appears that we also have to define opp_table->set_opp to make use >> of _set_opp_custom(). And I am not sure which custom-opp-setter we should >> use. Maybe ti_opp_supply_set_opp() is ok. Or not. > > This appears to be set by dra7.dtsi through loading the > "ti,omap5-opp-supply" compatible driver: > > https://elixir.bootlin.com/linux/v5.3-rc8/source/arch/arm/boot/dts/dra7.dtsi#L699 > > Maybe we can use "ti,omap-opp-supply" here, which does not read > additional eFuses? > > See also > > https://www.kernel.org/doc/Documentation/devicetree/bindings/opp/ti-omap5-opp-supply.txt > > And, if I understand the code ti_opp_supply_set_opp() correctly, we may not have > to rename cpu0-suppy to vdd-supply because that driver takes the first > regulator as vdd and the second as vbb. > > Something like > > opp_supply_mpu_iva: opp_supply { > compatible = "ti,omap-opp-supply"; > ti,absolute-max-voltage-uv = <1375000>; > }; > > But that is a quite wild guess... Well, seems to boot without complaints and do something reasonable! [ 144.816009] regulator regulator.3: ti_abb_get_voltage_sel [ 144.821685] regulator regulator.3: ti_abb_get_voltage_sel idx=2 [ 144.828521] regulator regulator.3: ti_abb_set_voltage_sel: choose sel 1 [ 145.133605] regulator regulator.3: ti_abb_get_voltage_sel [ 145.139404] regulator regulator.3: ti_abb_get_voltage_sel idx=1 [ 145.146881] regulator regulator.3: ti_abb_set_voltage_sel: choose sel 0 [ 145.174163] regulator regulator.3: ti_abb_set_voltage_sel: choose sel 1 [ 145.449493] regulator regulator.3: ti_abb_set_voltage_sel: choose sel 0 [ 145.485534] regulator regulator.3: ti_abb_set_voltage_sel: choose sel 2 (I have added printk to ti_abb_get_voltage_sel/ti_abb_set_voltage_sel). I can also see that there are transitions on the voltages (reg.8 is vdd and reg.3 is abb). root@letux:~# cat /sys/class/regulator/regulator.8/microvolts 1012500 root@letux:~# cat /sys/class/regulator/regulator.8/microvolts 1325000 root@letux:~# cat /sys/class/regulator/regulator.8/microvolts 1200000 root@letux:~# root@letux:~# cat /sys/class/regulator/regulator.3/microvolts 1325000 root@letux:~# cat /sys/class/regulator/regulator.3/microvolts 1200000 root@letux:~# cat /sys/class/regulator/regulator.3/microvolts 1200000 root@letux:~# What I haven't checked so far is if it toggles the ABB FBB bit. I have pushed my current work (the last 4 commits) to http://git.goldelico.com/?p=letux-kernel.git;a=shortlog;h=refs/heads/work-dm3730-1ghz so that you can inspect/compare/test/check before I tidy up and add the patches for our OPP-v2 patch set. BR, Nikolaus
