linux-kernel - `intel_lpss_pci_driver

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Date: Tue, 6 Feb 2024 22:08:15 +0100
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: Lee Jones <lee@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: `intel_lpss_pci_driver_init` takes 23.8 ms

Dear Linux folks,


On the Dell XPS 13 9360 and Linux 6.8-rc3+, 
`intel_lpss_pci_driver_init()` takes 23.8 ms, making it one of Linux’ 
longer init functions on this device:

```
[    0.000000] Linux version 6.8.0-rc3 
(build@...emianrhapsody.molgen.mpg.de) (gcc (Debian 13.2.0-13) 13.2.0, 
GNU ld (GNU Binutils for Debian) 2.42) #13 SMP PREEMPT_DYNAMIC Tue Feb 
6 08:07:48 CET 2024
[    0.000000] Command line: BOOT_IMAGE=/vmlinuz-6.8.0-rc3 
root=UUID=32e29882-d94d-4a92-9ee4-4d03002bfa29 ro quiet pci=noaer 
mem_sleep_default=deep log_buf_len=8M cryptomgr.notests initcall_debug
[…]
[    0.000000] DMI: Dell Inc. XPS 13 9360/0596KF, BIOS 2.21.0 06/02/2022
[…]
[    0.785696] calling  intel_lpss_pci_driver_init+0x0/0xff0 
[intel_lpss_pci] @ 153
[    0.785704] calling  crct10dif_intel_mod_init+0x0/0xff0 
[crct10dif_pclmul] @ 163
[    0.785796] calling  drm_core_init+0x0/0xff0 [drm] @ 161
[    0.785880] ACPI: bus type drm_connector registered
[    0.785887] initcall drm_core_init+0x0/0xff0 [drm] returned 0 after 
25 usecs
[    0.785936] intel-lpss 0000:00:15.0: enabling device (0000 -> 0002)
[    0.786210] idma64 idma64.0: Found Intel integrated DMA 64-bit
[    0.786221] probe of idma64.0 returned 0 after 81 usecs
[…]
[    0.801676] probe of i2c_designware.0 returned 0 after 15424 usecs
[    0.801691] probe of 0000:00:15.0 returned 0 after 15973 usecs
[    0.801870] intel-lpss 0000:00:15.1: enabling device (0000 -> 0002)
[    0.802116] idma64 idma64.1: Found Intel integrated DMA 64-bit
[    0.802123] probe of idma64.1 returned 0 after 55 usecs
[    0.819818] probe of i2c_designware.1 returned 0 after 17646 usecs
[    0.819832] probe of 0000:00:15.1 returned 0 after 18137 usecs
[    0.819852] initcall intel_lpss_pci_driver_init+0x0/0xff0 
[intel_lpss_pci] returned 0 after 23842 usecs
```

Is this expected, that probing

     00:15.1 Signal processing controller [1180]: Intel Corporation 
Sunrise Point-LP Serial IO I2C Controller #1 [8086:9d61] (rev 21)

takes 18 ms?


Kind regards,

Paul
View attachment "20240206–dell-xps-13-9360–linux-6.8-rc3.txt" of type "text/plain" (207421 bytes)