linux-kernel - RE: [PATCH v7 0/2] PCI: cadence: Retrain Link to work around Gen2

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Message-ID: <CO2PR07MB2503DA1FDDAD6970803C9F71D8A09@CO2PR07MB2503.namprd07.prod.outlook.com>
Date:   Fri, 22 Jan 2021 05:57:36 +0000
From:   Athani Nadeem Ladkhan <nadeem@...ence.com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Tom Joseph <tjoseph@...ence.com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "robh@...nel.org" <robh@...nel.org>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Milind Parab <mparab@...ence.com>,
        Swapnil Kashinath Jakhade <sjakhade@...ence.com>,
        Parshuram Raju Thombare <pthombar@...ence.com>
Subject: RE: [PATCH v7 0/2] PCI: cadence: Retrain Link to work around Gen2

Hi Rob / Thomas,

Requesting to provide your reviews.

Thanks & Regards,
Nadeem Athani

> -----Original Message-----
> From: Kishon Vijay Abraham I <kishon@...com>
> Sent: Tuesday, January 12, 2021 12:46 PM
> To: Athani Nadeem Ladkhan <nadeem@...ence.com>; Tom Joseph
> <tjoseph@...ence.com>; lorenzo.pieralisi@....com; robh@...nel.org;
> bhelgaas@...gle.com; linux-omap@...r.kernel.org; linux-
> pci@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; linux-
> kernel@...r.kernel.org
> Cc: Milind Parab <mparab@...ence.com>; Swapnil Kashinath Jakhade
> <sjakhade@...ence.com>; Parshuram Raju Thombare
> <pthombar@...ence.com>
> Subject: Re: [PATCH v7 0/2] PCI: cadence: Retrain Link to work around Gen2
> 
> EXTERNAL MAIL
> 
> 
> 
> 
> On 30/12/20 5:35 pm, Nadeem Athani wrote:
> > Cadence controller will not initiate autonomous speed change if
> > strapped as Gen2. The Retrain Link bit is set as quirk to enable this speed
> change.
> > Adding a quirk flag for defective IP. In future IP revisions this will
> > not be applicable.
> >
> > Version history:
> > Changes in v7:
> > - Changing the commit title of patch 1 in this series.
> > - Added a return value for function cdns_pcie_retrain().
> > Changes in v6:
> > - Move the position of function cdns_pcie_host_wait_for_link to remove
> >   compilation error. No changes in code. Separate patch for this.
> > Changes in v5:
> > - Remove the compatible string based setting of quirk flag.
> > - Removed additional Link Up Check
> > - Removed quirk from pcie-cadence-plat.c and added in pci-j721e.c
> > Changes in v4:
> > - Added a quirk flag based on a new compatible string.
> > - Change of api for link up: cdns_pcie_host_wait_for_link().
> > Changes in v3:
> > - To set retrain link bit,checking device capability & link status.
> > - 32bit read in place of 8bit.
> > - Minor correction in patch comment.
> > - Change in variable & macro name.
> > Changes in v2:
> > - 16bit read in place of 8bit.
> 
> Could get GEN2 card enumerated in GEN2 mode in J7ES EVM.
> 
> Tested-by: Kishon Vijay Abraham I <kishon@...com>
> 
> Thanks
> Kishon
> >
> > Nadeem Athani (2):
> >   PCI: cadence: Shifting of a function to support new code.
> >   PCI: cadence: Retrain Link to work around Gen2 training defect.
> >
> >  drivers/pci/controller/cadence/pci-j721e.c         |  3 +
> >  drivers/pci/controller/cadence/pcie-cadence-host.c | 70
> ++++++++++++++++------
> >  drivers/pci/controller/cadence/pcie-cadence.h      | 11 +++-
> >  3 files changed, 65 insertions(+), 19 deletions(-)
> >