linux-kernel - Re: [PATCH v2] dwc: dra7xx: Print link state to console for debug

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Message-ID: <20171025132328.GK21840@bhelgaas-glaptop.roam.corp.google.com>
Date:   Wed, 25 Oct 2017 08:23:28 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Faiz Abbas <faiz_abbas@...com>
Cc:     kishon@...com, bhelgaas@...gle.com, linux-omap@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] dwc: dra7xx: Print link state to console for debug

On Wed, Oct 25, 2017 at 01:51:53PM +0530, Faiz Abbas wrote:
> Bjorn,
> 
> On Wednesday 25 October 2017 01:29 AM, Bjorn Helgaas wrote:
> > On Thu, Oct 19, 2017 at 06:13:29PM +0530, Faiz Abbas wrote:
> >> Enable support for printing the LTSSM link state for debugging PCI
> >> when link is down.
> >>
> >> Signed-off-by: Faiz Abbas <faiz_abbas@...com>
> > 
> > Applied with Kishon's ack to pci/host-dra7xx for v4.15, thanks!
> > 
> > I tweaked the "link up" testing as follows (what I suggested before):
> > 
> > 
> > @@ -118,8 +157,18 @@ static int dra7xx_pcie_link_up(struct dw_pcie *pci)
> >  {
> >  	struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci);
> >  	u32 reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_PHY_CS);
> > +	int link_up = !!(reg & LINK_UP);
> > +	u32 cmd_reg;
> > +	u32 ltssm_state;
> > +
> > +	if (!link_up) {
> > +		cmd_reg = dra7xx_pcie_readl(dra7xx,
> > +					    PCIECTRL_DRA7XX_CONF_DEVICE_CMD);
> > +		ltssm_state = (cmd_reg & GENMASK(7, 2)) >> 2;
> > +		dev_dbg(pci->dev, "Link state: %s\n", state[ltssm_state]);
> > +	}
> >  
> > -	return !!(reg & LINK_UP);
> > +	return link_up;
> >  }
> >  
> >  static void dra7xx_pcie_stop_link(struct dw_pcie *pci)
> > 
> 
> I wanted to send another version with David's suggestions included.
> Please don't merge.

Dropped.