linux-kernel - Re: [PATCH v5 2/7] scsi: ufs-qcom: Add reset control support for host controller

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Date:   Fri, 20 Dec 2019 08:30:57 +0800
From:   cang@...eaurora.org
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Jeffrey Hugo <jeffrey.l.hugo@...il.com>, asutoshd@...eaurora.org,
        nguyenb@...eaurora.org, Rajendra Nayak <rnayak@...eaurora.org>,
        linux-scsi@...r.kernel.org, kernel-team@...roid.com,
        saravanak@...gle.com, Mark Salyzyn <salyzyn@...gle.com>,
        Andy Gross <agross@...nel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Pedro Sousa <pedrom.sousa@...opsys.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "open list:ARM/QUALCOMM SUPPORT" <linux-arm-msm@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 2/7] scsi: ufs-qcom: Add reset control support for host
 controller

On 2019-12-19 22:52, Vinod Koul wrote:
> On 19-12-19, 07:25, Jeffrey Hugo wrote:
>> On Thu, Dec 19, 2019 at 7:21 AM Vinod Koul <vkoul@...nel.org> wrote:
>> >
>> > On 19-12-19, 15:12, cang@...eaurora.org wrote:
>> > > On 2019-12-18 12:12, Vinod Koul wrote:
>> > > > On 18-12-19, 02:44, cang@...eaurora.org wrote:
>> >
>> > >
>> > > Aside of the phy settings, your DT needs some modifications too,
>> > > seems you copied most of them from sdm845.
>> > > https://git.kernel.org/pub/scm/linux/kernel/git/qcom/linux.git/commit/?h=for-next&id=3834a2e92229ef26d30de28acb698b2b23d3e397
>> > >
>> > > <--snip-->
>> > > > +           ufs_mem_phy: phy@...7000 {
>> > > > +                   compatible = "qcom,sm8150-qmp-ufs-phy";
>> > > > +                   reg = <0 0x01d87000 0 0x18c>;
>> > >
>> > > The size 0x18c is wrong, in the code you are even accessing registers
>> > > whose offsets are beyond 0x18c, see
>> > >
>> > > #define QSERDES_V4_COM_BIN_VCOCAL_CMP_CODE1_MODE0     0x1ac
>> > > #define QSERDES_V4_COM_BIN_VCOCAL_CMP_CODE2_MODE0     0x1b0
>> > > #define QSERDES_V4_COM_BIN_VCOCAL_CMP_CODE1_MODE1     0x1b4
>> > > #define QSERDES_V4_COM_BIN_VCOCAL_HSCLK_SEL           0x1bc
>> > > #define QSERDES_V4_COM_BIN_VCOCAL_CMP_CODE2_MODE1     0x1b8
>> > >
>> > > FYI, the total size of serdes registers is 0x1c0.
>> >
>> > Yeah I will update it to 0x1c0
>> >
>> > >
>> > > <--snip-->
>> > > > +                   ufs_mem_phy_lanes: lanes@...7400 {
>> > > > +                           reg = <0 0x01d87400 0 0x108>,
>> > > > +                                 <0 0x01d87600 0 0x1e0>,
>> > > > +                                 <0 0x01d87c00 0 0x1dc>,
>> > >
>> > > Same as above, see
>> > >
>> > > #define QPHY_V4_MULTI_LANE_CTRL1                      0x1e0
>> > >
>> > > FYI, the total size of PCS registers is 0x200
>> > >
>> > > > +                                 <0 0x01d87800 0 0x108>,
>> > > > +                                 <0 0x01d87a00 0 0x1e0>;
>> > > > +                           #phy-cells = <0>;
>> > > > +                   };
>> > > <--snip-->
>> >
>> > So I managed to fix it by configuring QPHY_SW_RESET in
>> > qcom_qmp_phy_com_init() before invoking the configuration. That makes it
>> > work for me. Will send patches shortly
>> 
>> So, you are going to send some fixes to make sm8150 work.  We also
>> need the extended timeout for all platforms, yes?  Who is going to
>> send up the patch for the timeout?  All of this should be -rc material
>> since Can's change caused these issues to appear, and thus impact
>> users, no?
> 
> yeah I have tested a timeout of 10ms and seems to look good for me on
> sm8150 and sdm845. I will be sending the patches in few minutes :) and
> yes the timeout should be marked to 5.5 fixes
> 
> Thanks

Hi Vinod,

Good to know it works for you. Vivek Gautam, who is the author QCOM UFS 
PHY
driver, has left QCOM. Please add Asutosh Das(asutoshd@...eaurora.org),
Bao D. Nguyen(nguyenb@...eaurora.org) and me for QCOM UFS PHY changes.

Actually, without this change, your PHY is not even re-initialized at 
all
during kernel bootup, it just retains whatever it was configured in 
UEFI,
yet you are still saying this is a regression. The extended timeout is 
what
UFS PHY has to take for a full initialization.

Regards,
Can Guo.