Messages in this thread | | | Date | Thu, 8 Feb 2024 19:33:46 +0200 | From | Andy Shevchenko <> | Subject | Re: `intel_lpss_pci_driver_init` takes 23.8 ms |
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On Thu, Feb 08, 2024 at 08:59:28AM +0000, Lee Jones wrote: > On Tue, 06 Feb 2024, Paul Menzel wrote:
> > 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:
Does it mean on the previous releases it was different? I mean is it a regression or always was like this?
> > > > ``` > > [ 0.000000] Linux version 6.8.0-rc3 > > (build@bohemianrhapsody.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?
And it seems that the real culprit is the DesingWare driver itself, am I wrong?
-- With Best Regards, Andy Shevchenko
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