Bug 178371

Summary:	Nokia N900 (omap3-n900) with "VDD1: ramp_delay not set" string in printk
Product:	Platform Specific/Hardware	Reporter:	Icenowy Zheng (icenowy)
Component:	ARM	Assignee:	linux-arm-kernel (linux-arm-kernel)
Status:	NEW ---
Severity:	normal	CC:	regressions, szg00000
Priority:	P1
Hardware:	ARM
OS:	Linux
Kernel Version:	4.9-rc1	Subsystem:
Regression:	No	Bisected commit-id:

Description Icenowy Zheng 2016-10-19 09:53:12 UTC

I booted the newest 4.9-rc1 kernel on my N900. (with also the device tree provided in mainline)

After it's booted, main functions can perform well, but I got "VDD1: ramp_delay not set" message frequently, which affected console usage.

Comment 1 The Linux kernel's regression tracker (Thorsten Leemhuis) 2016-10-23 12:16:28 UTC

Friendly advice from the regression tracker. This warning comes from here
$ grep -r "ramp_delay not set"  *
drivers/regulator/core.c:		rdev_warn(rdev, "ramp_delay not set\n");

Hence you might want to contact people using below  mail addresses, as the relevant people are unlikely to see the problem here in bugzilla: 

$ ./scripts/get_maintainer.pl drivers/regulator/core.c
Liam Girdwood <lgirdwood@gmail.com> (supporter:VOLTAGE AND CURRENT REGULATOR FRAMEWORK)
Mark Brown <broonie@kernel.org> (supporter:VOLTAGE AND CURRENT REGULATOR FRAMEWORK)
linux-kernel@vger.kernel.org (open list:VOLTAGE AND CURRENT REGULATOR FRAMEWORK)

Maybe those are the wrong people to contact (it might happen due to change in a different area), but they should be able to point you in the right direction if you ask nicely.