Re: [PATCH] ASoC: fsl_sai: Don't use devm_regmap_init_mmio_clk

From: Guenter Roeck
Date: Sun Apr 11 2021 - 10:42:05 EST

On Fri, Mar 19, 2021 at 04:06:43PM +0800, Shengjiu Wang wrote:
> When there is power domain bind with bus clock,
>
> The call flow:
> devm_regmap_init_mmio_clk
> - clk_prepare()
> - clk_pm_runtime_get()
>
> cause the power domain of clock always be enabled after
> regmap_init(). which impact the power consumption.
>
> So use devm_regmap_init_mmio instead of
> devm_regmap_init_mmio_clk, then explicitly enable clock when
> using by pm_runtime_get(), if CONFIG_PM=n, then
> fsl_sai_runtime_resume will be explicitly called.
>
> Signed-off-by: Shengjiu Wang <shengjiu.wang@xxxxxxx>
> Signed-off-by: Viorel Suman <viorel.suman@xxxxxxx>

This patch results in a crash when running mcimx6ul-evk in qemu.
Reverting it fixes the problem.

Crash and bisect logs attached.

Guenter

---
[ 19.196778] 8<--- cut here ---
[ 19.197011] Unhandled fault: external abort on non-linefetch (0x808) at 0xd1588000
[ 19.197135] pgd = (ptrval)
[ 19.197203] [d1588000] *pgd=824da811, *pte=0202c653, *ppte=0202c453
[ 19.197764] Internal error: : 808 [#1] SMP ARM
[ 19.197953] Modules linked in:
[ 19.198108] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.12.0-rc6-next-20210409 #1
[ 19.198234] Hardware name: Freescale i.MX6 Ultralite (Device Tree)
[ 19.198354] PC is at regmap_mmio_write32le+0x24/0x2c
[ 19.198482] LR is at regmap_mmio_write32le+0x1c/0x2c
[ 19.198544] pc : [<c0965d6c>] lr : [<c0965d64>] psr: 60000093
[ 19.198611] sp : c20b5cf0 ip : 00000000 fp : c017a344
[ 19.198669] r10: c217c1b0 r9 : c20b4000 r8 : c26fcc00
[ 19.198729] r7 : 01000000 r6 : c26ff580 r5 : 00000000 r4 : 01000000
[ 19.198801] r3 : d1588000 r2 : 01000000 r1 : d1588000 r0 : c26ff580
[ 19.198896] Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment none
[ 19.198982] Control: 10c5387d Table: 826bc06a DAC: 00000051
[ 19.199060] Register r0 information: slab kmalloc-64 start c26ff580 pointer offset 0 size 64
[ 19.199421] Register r1 information: 0-page vmalloc region starting at 0xd1588000 allocated at __devm_ioremap+0x90/0xa4
[ 19.199587] Register r2 information: non-paged memory
[ 19.199667] Register r3 information: 0-page vmalloc region starting at 0xd1588000 allocated at __devm_ioremap+0x90/0xa4
[ 19.199774] Register r4 information: non-paged memory
[ 19.199832] Register r5 information: NULL pointer
[ 19.199888] Register r6 information: slab kmalloc-64 start c26ff580 pointer offset 0 size 64
[ 19.199998] Register r7 information: non-paged memory
[ 19.200056] Register r8 information: slab kmalloc-1k start c26fcc00 pointer offset 0 size 1024
[ 19.200167] Register r9 information: non-slab/vmalloc memory
[ 19.200252] Register r10 information: slab kmalloc-1k start c217c000 pointer offset 432 size 1024
[ 19.200367] Register r11 information: non-slab/vmalloc memory
[ 19.200431] Register r12 information: NULL pointer
[ 19.200495] Process swapper/0 (pid: 1, stack limit = 0x(ptrval))
[ 19.200596] Stack: (0xc20b5cf0 to 0xc20b6000)
[ 19.200755] 5ce0: c26ff580 00000000 01000000 c0965f40
[ 19.200932] 5d00: c26fcc00 00000000 00000000 c095f3cc c20c0000 c26fcc00 00000000 01000000
[ 19.201096] 5d20: c269b840 00000000 c20b4000 c217c1b0 c017a344 c0961130 00000080 c217c010
[ 19.201259] 5d40: c26ff5c0 c0d21354 c217c010 c0946e24 00000000 c0946e24 c217c114 c094a894
[ 19.201420] 5d60: c217c010 c0946e24 c2173810 c217c114 c2173914 c20b4000 c217c1b0 c094a930
[ 19.201582] 5d80: c217c010 c0946e24 c2173810 c094a468 c20c0000 c20b4000 c094a6a0 60000013
[ 19.201744] 5da0: 00000002 cbdc8024 c217c114 5bdc6b72 60000013 60000013 c217c114 00000004
[ 19.201906] 5dc0: 00000002 cbdc8024 c20b4000 c269b880 00000000 c094a6b4 c269b840 c217c010
[ 19.202067] 5de0: c217c000 c0d2176c 00000000 00000000 00000000 00000000 c2176340 c21d5c00
[ 19.202228] 5e00: 00000000 6b6c636d 00000033 5bdc6b72 00000000 00000000 c217c010 c18d47fc
[ 19.202389] 5e20: c1f70c20 00000000 c18d47fc 00000000 00000000 c093f540 c217c010 c1f70c1c
[ 19.202551] 5e40: 00000000 c1f70c20 00000000 c093cdec c217c010 c18d47fc c18d47fc c20b4000
[ 19.202712] 5e60: 00000000 c166e854 c20af880 c093d0fc c217c010 00000000 c18d47fc c093d418
[ 19.202873] 5e80: 00000000 c18d47fc c217c010 c093d484 00000000 c18d47fc c093d420 c093aefc
[ 19.203035] 5ea0: c26fe980 c20ae2b0 c214be94 5bdc6b72 c20ae2e4 c18d47fc c26fe980 00000000
[ 19.203196] 5ec0: c187bcf8 c093c0b8 c14db3fc c1661678 c18f4c20 c18d47fc c1661678 c18f4c20
[ 19.203357] 5ee0: c17093d0 c093e1e4 c20b4000 c1661678 c18f4c20 c01022b0 00000000 00000000
[ 19.203533] 5f00: c20af8ec 00000000 c17e0b10 c0f39294 c17093d0 ffffffff c14a1cb8 c20b4000
[ 19.203696] 5f20: c18f4c20 c17093d0 c15644e0 c18ff000 c166e854 000001c6 00000000 c01af994
[ 19.203858] 5f40: 00000000 5bdc6b72 c168dca8 00000007 c166e874 c15644e0 c18ff000 c166e854
[ 19.204019] 5f60: c20af880 c16010a0 00000006 00000006 00000000 c16003e8 c0f46080 000001c6
[ 19.204180] 5f80: c17097d0 00000000 c0f3a784 00000000 00000000 00000000 00000000 00000000
[ 19.204342] 5fa0: 00000000 c0f3a78c 00000000 c010013c 00000000 00000000 00000000 00000000
[ 19.204503] 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 19.204663] 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000
[ 19.204828] [<c0965d6c>] (regmap_mmio_write32le) from [<c0965f40>] (regmap_mmio_write+0x3c/0x54)
[ 19.204947] [<c0965f40>] (regmap_mmio_write) from [<c095f3cc>] (_regmap_write+0x4c/0x1f4)
[ 19.205034] [<c095f3cc>] (_regmap_write) from [<c0961130>] (regmap_write+0x3c/0x60)
[ 19.205114] [<c0961130>] (regmap_write) from [<c0d21354>] (fsl_sai_runtime_resume+0x9c/0x1ec)
[ 19.205206] [<c0d21354>] (fsl_sai_runtime_resume) from [<c094a894>] (__rpm_callback+0xb4/0x130)
[ 19.205297] [<c094a894>] (__rpm_callback) from [<c094a930>] (rpm_callback+0x20/0x80)
[ 19.205379] [<c094a930>] (rpm_callback) from [<c094a468>] (rpm_resume+0x604/0x7ec)
[ 19.205459] [<c094a468>] (rpm_resume) from [<c094a6b4>] (__pm_runtime_resume+0x64/0xa4)
[ 19.205543] [<c094a6b4>] (__pm_runtime_resume) from [<c0d2176c>] (fsl_sai_probe+0x2c8/0x674)
[ 19.205630] [<c0d2176c>] (fsl_sai_probe) from [<c093f540>] (platform_probe+0x58/0xb8)
[ 19.205694] [<c093f540>] (platform_probe) from [<c093cdec>] (really_probe+0xec/0x398)
[ 19.205765] [<c093cdec>] (really_probe) from [<c093d0fc>] (driver_probe_device+0x64/0xc0)
[ 19.205854] [<c093d0fc>] (driver_probe_device) from [<c093d418>] (device_driver_attach+0x58/0x60)
[ 19.205944] [<c093d418>] (device_driver_attach) from [<c093d484>] (__driver_attach+0x64/0xdc)
[ 19.206028] [<c093d484>] (__driver_attach) from [<c093aefc>] (bus_for_each_dev+0x78/0xb8)
[ 19.206113] [<c093aefc>] (bus_for_each_dev) from [<c093c0b8>] (bus_add_driver+0x150/0x1dc)
[ 19.206200] [<c093c0b8>] (bus_add_driver) from [<c093e1e4>] (driver_register+0x74/0x108)
[ 19.206285] [<c093e1e4>] (driver_register) from [<c01022b0>] (do_one_initcall+0x80/0x3a8)
[ 19.206374] [<c01022b0>] (do_one_initcall) from [<c16010a0>] (kernel_init_freeable+0x158/0x1f4)
[ 19.206466] [<c16010a0>] (kernel_init_freeable) from [<c0f3a78c>] (kernel_init+0x8/0x11c)
[ 19.206556] [<c0f3a78c>] (kernel_init) from [<c010013c>] (ret_from_fork+0x14/0x38)
[ 19.206653] Exception stack(0xc20b5fb0 to 0xc20b5ff8)
[ 19.206749] 5fa0: 00000000 00000000 00000000 00000000
[ 19.206916] 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 19.207063] 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[ 19.207290] Code: ee073f9a ebdeca40 e5963000 e0831005 (e5814000)
[ 19.207813] ---[ end trace 4c72393d5e30d6c1 ]---

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# bad: [e99d8a8495175df8cb8b739f8cf9b0fc9d0cd3b5] Add linux-next specific files for 20210409
# good: [e49d033bddf5b565044e2abe4241353959bc9120] Linux 5.12-rc6
git bisect start 'HEAD' 'v5.12-rc6'
# good: [24c5f79572740c1744a7ec2e9e21b541acab6de3] Merge remote-tracking branch 'crypto/master'
git bisect good 24c5f79572740c1744a7ec2e9e21b541acab6de3
# bad: [4b90473874c7b6af320b9815f82ac305fd8807f7] Merge remote-tracking branch 'ftrace/for-next'
git bisect bad 4b90473874c7b6af320b9815f82ac305fd8807f7
# good: [9cf3382276b26848891c7e072db0a774fadd10e4] Merge remote-tracking branch 'sound/for-next'
git bisect good 9cf3382276b26848891c7e072db0a774fadd10e4
# bad: [f8d16164c586548d7ccedc058ca9ae547e0cebbe] Merge remote-tracking branch 'mmc/next'
git bisect bad f8d16164c586548d7ccedc058ca9ae547e0cebbe
# bad: [c7c19ec098b862a688291f5a1101f7de6e4b0a6c] ASoC: Intel: kbl: Add MST route change to kbl machine drivers
git bisect bad c7c19ec098b862a688291f5a1101f7de6e4b0a6c
# good: [1db19c151819dea7a0dc4d888250d25abaf229ca] ASoC: soc-pcm: fixup dpcm_be_dai_startup() user count
git bisect good 1db19c151819dea7a0dc4d888250d25abaf229ca
# bad: [f89c0a87b4066fbb0dc6f8039b211bd79a9ab663] Merge tag 'ib-mfd-extcon-v5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd into asoc-5.13
git bisect bad f89c0a87b4066fbb0dc6f8039b211bd79a9ab663
# good: [a2cc1568dc50020a807c94bd14a053dd54e9c35e] ASoC: tscs454: remove useless test on PLL disable
git bisect good a2cc1568dc50020a807c94bd14a053dd54e9c35e
# good: [cb11f79b4af65005584880eb408f9748c32661d0] ASoC: soc-pcm: indicate error message at soc_pcm_hw_params()
git bisect good cb11f79b4af65005584880eb408f9748c32661d0
# good: [60adbd8fbf486214f4ae1946e61df69c3867e20b] ASoC: don't indicate error message for snd_soc_[pcm_]component_xxx()
git bisect good 60adbd8fbf486214f4ae1946e61df69c3867e20b
# bad: [dfb81e3b5f47aa0ea5e4832eeb720bc22f07d0c1] ASoC: SOF: Intel: hda: drop display power on/off in D0i3 flows
git bisect bad dfb81e3b5f47aa0ea5e4832eeb720bc22f07d0c1
# good: [7e71b48f9e27e437ca523432ea285c2585a539dc] ASoC: amd: Add support for RT5682 codec in machine driver
git bisect good 7e71b48f9e27e437ca523432ea285c2585a539dc
# bad: [b951b51e2ca4d37dc9781e14d8a49d2f2b7e715b] ASoC: SOF: add a helper to get topology configured mclk
git bisect bad b951b51e2ca4d37dc9781e14d8a49d2f2b7e715b
# bad: [2277e7e36b4b8c27eb8d2fb33a20440bc800c2d7] ASoC: fsl_sai: Don't use devm_regmap_init_mmio_clk
git bisect bad 2277e7e36b4b8c27eb8d2fb33a20440bc800c2d7
# first bad commit: [2277e7e36b4b8c27eb8d2fb33a20440bc800c2d7] ASoC: fsl_sai: Don't use devm_regmap_init_mmio_clk