linux-kernel - Re: [PATCH v7 2/3] PCI: rockchip: Simplify reset control handling by using reset_control

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Message-ID: <20241012080019.cdgq63rwj6oi4bg7@thinkpad>
Date: Sat, 12 Oct 2024 13:30:19 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Anand Moon <linux.amoon@...il.com>
Cc: Shawn Lin <shawn.lin@...k-chips.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	"open list:PCIE DRIVER FOR ROCKCHIP" <linux-pci@...r.kernel.org>,
	"open list:PCIE DRIVER FOR ROCKCHIP" <linux-rockchip@...ts.infradead.org>,
	"moderated list:ARM/Rockchip SoC support" <linux-arm-kernel@...ts.infradead.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 2/3] PCI: rockchip: Simplify reset control handling by
 using reset_control_bulk*() function

On Sat, Oct 12, 2024 at 12:55:32PM +0530, Anand Moon wrote:
> Hi Manivannan,
> 
> Thanks for your review comments.
> 
> On Sat, 12 Oct 2024 at 11:48, Manivannan Sadhasivam
> <manivannan.sadhasivam@...aro.org> wrote:
> >
> > On Sat, Oct 12, 2024 at 10:36:04AM +0530, Anand Moon wrote:
> > > Refactor the reset control handling in the Rockchip PCIe driver,
> > > introducing a more robust and efficient method for assert and
> > > deassert reset controller using reset_control_bulk*() API. Using the
> > > reset_control_bulk APIs, the reset handling for the core clocks reset
> > > unit becomes much simpler.
> > >
> >
> > Same comments as previous patch.
> >
> I will explain more about this.
> > > Spilt the reset controller in two groups as pre the RK3399 TRM.
> >
> > *per
> >
> > Also please state the TRM name and section for reference.
> >
> Yes
> > > After power up, the software driver should de-assert the reset of PCIe PHY,
> > > then wait the PLL locked by polling the status, if PLL
> > > has locked, then can de-assert the reset simultaneously
> > > driver need to De-assert the reset pins simultionaly.
> > >
> > >   PIPE_RESET_N/MGMT_STICKY_RESET_N/MGMT_RESET_N/RESET_N.
> > >
> > > - replace devm_reset_control_get_exclusive() with
> > >       devm_reset_control_bulk_get_exclusive().
> > > - replace reset_control_assert with
> > >       reset_control_bulk_assert().
> > > - replace reset_control_deassert with
> > >       reset_control_bulk_deassert().
> > >
> > > Signed-off-by: Anand Moon <linux.amoon@...il.com>
> > > ---
> > > v7: replace devm_reset_control_bulk_get_optional_exclusive()
> > >         with devm_reset_control_bulk_get_exclusive()
> > >     update the functional changes.
> > > V6: Add reason for the split of the RESET pins.
> > > v5: Fix the De-assert reset core as per the TRM
> > >     De-assert the PIPE_RESET_N/MGMT_STICKY_RESET_N/MGMT_RESET_N/RESET_N
> > >     simultaneously.
> > > v4: use dev_err_probe in error path.
> > > v3: Fix typo in commit message, dropped reported by.
> > > v2: Fix compilation error reported by Intel test robot
> > >     fixed checkpatch warning.
> > > ---
> > >  drivers/pci/controller/pcie-rockchip.c | 151 +++++--------------------
> > >  drivers/pci/controller/pcie-rockchip.h |  26 +++--
> > >  2 files changed, 49 insertions(+), 128 deletions(-)
> > >
> > > diff --git a/drivers/pci/controller/pcie-rockchip.c b/drivers/pci/controller/pcie-rockchip.c
> > > index 2777ef0cb599..9a118e2b8cbd 100644
> > > --- a/drivers/pci/controller/pcie-rockchip.c
> > > +++ b/drivers/pci/controller/pcie-rockchip.c

[...]

> > > @@ -256,31 +181,15 @@ int rockchip_pcie_init_port(struct rockchip_pcie *rockchip)
> > >        * Please don't reorder the deassert sequence of the following
> > >        * four reset pins.
> >
> > I don't think my earlier comment on this addressed. Why are you changing the
> > reset order? Why can't you have the resets in below (older) order?
> >
> > static const char * const rockchip_pci_core_rsts[] = {
> >         mgmt-sticky",
> >         "core",
> >         "mgmt",
> >         "pipe",
> > };
>  I will add a comment on this above.

Sorry, I don't get your response. My suggestion was to keep the resets sorted as
the original order (also indicated by my above snippet).

- Mani

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