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

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Message-ID: <c9cd405b-024c-cc80-586a-7fd3d28dfd96@ti.com>
Date:   Mon, 8 Feb 2021 07:30:04 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Nadeem Athani <nadeem@...ence.com>, <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:     <mparab@...ence.com>, <sjakhade@...ence.com>,
        <pthombar@...ence.com>
Subject: Re: [PATCH v7 0/2] PCI: cadence: Retrain Link to work around Gen2

Hi Lorenzo, Rob,

On 12/01/21 12:45 pm, Kishon Vijay Abraham I wrote:
> 
> 
> 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>

Can this series be merged?

Thanks
Kishon

> 
> 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(-)
>>