linux-kernel - Re: [PATCH] PCI: tegra: Fix host initialization during resume

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Date:   Mon, 17 May 2021 11:47:33 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:     Jon Hunter <jonathanh@...dia.com>, Vidya Sagar <vidyas@...dia.com>,
        robh@...nel.org, bhelgaas@...gle.com, thierry.reding@...il.com,
        jingoohan1@...il.com, gustavo.pimentel@...opsys.com,
        linux-pci@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, kthota@...dia.com,
        mmaddireddy@...dia.com, sagar.tv@...il.com
Subject: Re: [PATCH] PCI: tegra: Fix host initialization during resume

On Mon, May 17, 2021 at 05:18:36PM +0100, Lorenzo Pieralisi wrote:
> On Mon, May 17, 2021 at 03:11:00PM +0100, Jon Hunter wrote:
> > Hi Lorenzo, Bjorn,
> > 
> > On 06/05/2021 09:49, Jon Hunter wrote:
> > > 
> > > On 04/05/2021 18:21, Vidya Sagar wrote:
> > >> Commit 275e88b06a27 ("PCI: tegra: Fix host link initialization") broke
> > >> host initialization during resume as it misses out calling the API
> > >> dw_pcie_setup_rc() which is required for host and MSI initialization.
> > >>
> > >> Fixes: 275e88b06a27 ("PCI: tegra: Fix host link initialization")
> > >> Signed-off-by: Vidya Sagar <vidyas@...dia.com>
> > >> ---
> > >>  drivers/pci/controller/dwc/pcie-tegra194.c | 2 ++
> > >>  1 file changed, 2 insertions(+)
> > >>
> > >> diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
> > >> index 6fa216e52d14..4c3c0738f2e6 100644
> > >> --- a/drivers/pci/controller/dwc/pcie-tegra194.c
> > >> +++ b/drivers/pci/controller/dwc/pcie-tegra194.c
> > >> @@ -2214,6 +2214,8 @@ static int tegra_pcie_dw_resume_noirq(struct device *dev)
> > >>  		goto fail_host_init;
> > >>  	}
> > >>  
> > >> +	dw_pcie_setup_rc(&pcie->pci.pp);
> > >> +
> > >>  	ret = tegra_pcie_dw_start_link(&pcie->pci);
> > >>  	if (ret < 0)
> > >>  		goto fail_host_init;
> > > 
> > > Thanks for fixing!
> > > 
> > > Tested-by: Jon Hunter <jonathanh@...dia.com>
> > > 
> > > We should also mark this for stable so that this gets back-ported.
> > 
> > Can we queue this as a fix for v5.13 and tag for stable?
> 
> We usually send fixes for -rc* when the patches they are fixing
> were merged in the current cycle (ie merged for v5.13).

Looks like this has been broken since v5.11-rc1 (December 27, 2020),
when 275e88b06a27 was merged.  Probably would be worth an occasional
boot test to make sure things stay working.

> This is not the case so I shall send it for v5.14.
> 
> Lorenzo