linux-kernel - RE: [PATCH v3 13/15] phy: cadence: Sierra: Add PCIe + QSGMII PHY multilink configuration

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Message-ID: <MW2PR07MB7899EC5A08D975E646F48A96D3709@MW2PR07MB7899.namprd07.prod.outlook.com>
Date:   Thu, 9 Dec 2021 06:11:19 +0000
From:   Milind Parab <mparab@...ence.com>
To:     Swapnil Kashinath Jakhade <sjakhade@...ence.com>,
        Vinod Koul <vkoul@...nel.org>
CC:     "kishon@...com" <kishon@...com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "a-govindraju@...com" <a-govindraju@...com>
Subject: RE: [PATCH v3 13/15] phy: cadence: Sierra: Add PCIe + QSGMII PHY
 multilink configuration

Hi Vinod,

Do you have any further comments on this.
The implementation follows the same approach as is done for Cadence Torrent multiprotocol Phy

Regards,
Milind

>-----Original Message-----
>From: Swapnil Kashinath Jakhade <sjakhade@...ence.com>
>Sent: Thursday, December 2, 2021 7:43 PM
>To: Vinod Koul <vkoul@...nel.org>
>Cc: kishon@...com; robh+dt@...nel.org; p.zabel@...gutronix.de; linux-
>phy@...ts.infradead.org; linux-kernel@...r.kernel.org;
>devicetree@...r.kernel.org; Milind Parab <mparab@...ence.com>; a-
>govindraju@...com
>Subject: RE: [PATCH v3 13/15] phy: cadence: Sierra: Add PCIe + QSGMII PHY
>multilink configuration
>
>Hi Vinod,
>
>> -----Original Message-----
>> From: Vinod Koul <vkoul@...nel.org>
>> Sent: Thursday, November 25, 2021 10:41 AM
>> To: Swapnil Kashinath Jakhade <sjakhade@...ence.com>
>> Cc: kishon@...com; robh+dt@...nel.org; p.zabel@...gutronix.de; linux-
>> phy@...ts.infradead.org; linux-kernel@...r.kernel.org;
>> devicetree@...r.kernel.org; Milind Parab <mparab@...ence.com>; a-
>> govindraju@...com
>> Subject: Re: [PATCH v3 13/15] phy: cadence: Sierra: Add PCIe + QSGMII
>> PHY multilink configuration
>>
>> EXTERNAL MAIL
>>
>>
>> On 24-11-21, 07:33, Swapnil Kashinath Jakhade wrote:
>>
>> > > so this is pcie->qsgmii ->ssc/external/internal ... ok
>> > >
>> > > > +				[NO_SSC] =
>> > > &pcie_100_no_ssc_plllc_cmn_vals,
>> > > > +				[EXTERNAL_SSC] =
>> > > &pcie_100_ext_ssc_plllc_cmn_vals,
>> > > > +				[INTERNAL_SSC] =
>> > > &pcie_100_int_ssc_plllc_cmn_vals,
>> > > > +			},
>> > > >  		},
>> > > >  		[TYPE_USB] = {
>> > > >  			[TYPE_NONE] = {
>> > > >  				[EXTERNAL_SSC] =
>> > > &usb_100_ext_ssc_cmn_vals,
>> > > >  			},
>> > > >  		},
>> > > > +		[TYPE_QSGMII] = {
>> > > > +			[TYPE_PCIE] = {
>> > >
>> > > now it is reverse! qsgmii -> pcie -> ... why?
>> > >
>> > > what is meant by pcie->qsgmii and qsgmii-> pcie?
>> > >
>> >
>> > Multi-protocol configuration is done in 2 phases, each for one protocol.
>> > e.g. for PCIe + QSGMII case,
>> > [TYPE_PCIE][TYPE_QSGMII] will configure common and lane registers
>> > for PCIe and [TYPE_QSGMII][TYPE_PCIE] will configure common and lane
>> registers for QSGMII.
>>
>> Then it should be always common + protocol or protocol + common, not
>> both please! Pls make an order and stick to it everywhere... If that
>> is not possible, I would like to understand why
>>
>
>Could you please elaborate what do you mean by " common + protocol or
>protocol + common, not both please!"?
>The order is same everywhere which is common + lane configuration for
>protocol 1 and then for protocol 2. For multiprotocol case, PHY configuration is
>based on which protocols are operating simultaneously. So e.g.
>[TYPE_QSGMII][TYPE_PCIE] -> QSGMII configuration when other protocol is
>PCIe Which might be different than [TYPE_QSGMII][TYPE_*] -> QSGMII
>configuration with other protocol.
>
>Thanks & regards,
>Swapnil
>
>> --
>> ~Vinod