linux-kernel - Re: [PATCH v1] PCI: dw-rockchip: Simplify regulator setup with devm_regulator_get_enable

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4fqtxx5isbvyypgjzjczm4mxqhawsmcalap5bvkohgpeqxnyar@uy5bo2yb4lwy>
Date: Sun, 19 Oct 2025 11:55:45 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Anand Moon <linux.amoon@...il.com>
Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>, 
	Krzysztof Wilczyński <kwilczynski@...nel.org>, Rob Herring <robh@...nel.org>, 
	Bjorn Helgaas <bhelgaas@...gle.com>, Heiko Stuebner <heiko@...ech.de>, 
	Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, 
	Niklas Cassel <cassel@...nel.org>, Shawn Lin <shawn.lin@...k-chips.com>, 
	Hans Zhang <18255117159@....com>, Wilfred Mallawa <wilfred.mallawa@....com>, 
	"open list:PCI NATIVE HOST BRIDGE AND ENDPOINT DRIVERS" <linux-pci@...r.kernel.org>, 
	"moderated list:ARM/Rockchip SoC support" <linux-arm-kernel@...ts.infradead.org>, 
	"open list:ARM/Rockchip SoC support" <linux-rockchip@...ts.infradead.org>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] PCI: dw-rockchip: Simplify regulator setup with
 devm_regulator_get_enable_optional()

On Sat, Oct 18, 2025 at 11:21:49AM +0530, Anand Moon wrote:
> Hi All,
> 
> On Fri, 5 Sept 2025 at 16:57, Anand Moon <linux.amoon@...il.com> wrote:
> >
> > Replace manual get/enable logic with devm_regulator_get_enable_optional()
> > to reduce boilerplate and improve error handling. This devm helper ensures
> > the regulator is enabled during probe and automatically disabled on driver
> > removal. Dropping the vpcie3v3 struct member eliminates redundant state
> > tracking, resulting in cleaner and more maintainable code.
> >
> > Signed-off-by: Anand Moon <linux.amoon@...il.com>
> > ---
> >  drivers/pci/controller/dwc/pcie-dw-rockchip.c | 23 +++++--------------
> >  1 file changed, 6 insertions(+), 17 deletions(-)
> >
> If we compile the kernel with phy and regulator as modules,
> I observe this message.
> 
> [   25.473960][   T55] platform 3c0800000.pcie: deferred probe
> pending: platform: supplier regulator-vcc3v3-pcie not ready
> [   25.474071][   T55] platform fe0a0000.hdmi: deferred probe pending:
> platform: wait for supplier /i2c@...40000/pmic@...regulators/LDO_REG9
> [   25.474124][   T55] platform regulator-vcc5v0-usb-otg: deferred
> probe pending: reg-fixed-voltage: can't get GPIO
> [   25.474171][   T55] platform fdc20000.syscon:io-domains: deferred
> probe pending: platform: wait for supplier
> /i2c@...40000/pmic@...regulators/SWITCH_REG1
> [   25.474218][   T55] platform cpufreq-dt: deferred probe pending:
> (reason unknown)
> [   25.474264][   T55] platform regulator-vcc3v3-pcie: deferred probe
> pending: reg-fixed-voltage: can't get GPIO
> [   25.474343][   T55] rockchip-pm-domain
> fdd90000.power-management:power-controller: Timed out. Forcing
> sync_state()
> [   37.744968][ T2415] psi: inconsistent task state!
> task=2280:(udev-worker) cpu=1 psi_flags=4 clear=0 set=4
> [   37.849725][   T50] fan53555-regulator 3-001c: FAN53555 Option[12]
> Rev[15] Detected!
> [   37.990008][ T2216] SCSI subsystem initialized
> 

This is a deferred probe log and not related to this patch or the PCIe
controller driver. The controller drivers should still be functional once the
dependent GPIO driver is probed.

- Mani

-- 
மணிவண்ணன் சதாசிவம்