linux-kernel - Re: [PATCH] scsi: ufs: qcom: move ufs_qcom_host_reset() to ufs_qcom_device

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Message-ID: <20231128112731.GV3088@thinkpad>
Date:   Tue, 28 Nov 2023 16:57:31 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Ziqi Chen <quic_ziqichen@...cinc.com>
Cc:     Can Guo <quic_cang@...cinc.com>, quic_asutoshd@...cinc.com,
        bvanassche@....org, beanhuo@...ron.com, avri.altman@....com,
        junwoo80.lee@...sung.com, martin.petersen@...cle.com,
        quic_nguyenb@...cinc.com, quic_nitirawa@...cinc.com,
        quic_rampraka@...cinc.com, linux-scsi@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "open list:ARM/QUALCOMM SUPPORT" <linux-arm-msm@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] scsi: ufs: qcom: move ufs_qcom_host_reset() to
 ufs_qcom_device_reset()

On Tue, Nov 28, 2023 at 03:40:57AM +0800, Ziqi Chen wrote:
> 
> 
> On 11/22/2023 2:14 PM, Can Guo wrote:
> > 
> > 
> > On 10/25/2023 3:41 PM, Manivannan Sadhasivam wrote:
> > > On Tue, Oct 24, 2023 at 07:10:15PM +0800, Ziqi Chen wrote:
> > > > During PISI test, we found the issue that host Tx still bursting after
> > > 
> > > What is PISI test?
> 
> SI measurement.
> 

Please expand it in the patch description.

> > > 
> > > > H/W reset. Move ufs_qcom_host_reset() to ufs_qcom_device_reset() and
> > > > reset host before device reset to stop tx burst.
> > > > 
> > > 
> > > device_reset() callback is supposed to reset only the device and not
> > > the host.
> > > So NACK for this patch.
> > 
> > Agree, the change should come in a more reasonable way.
> > 
> > Actually, similar code is already there in ufs_mtk_device_reset() in
> > ufs-mediatek.c, I guess here is trying to mimic that fashion.
> > 
> > This change, from its functionality point of view, we do need it,
> > because I occasionally (2 out of 10) hit PHY error on lane 0 during
> > reboot test (in my case, I tried SM8350, SM8450 and SM8550， all same).
> > 
> > [    1.911188] [DEBUG]ufshcd_update_uic_error: UECPA:0x80000002
> > [    1.922843] [DEBUG]ufshcd_update_uic_error: UECDL:0x80004000
> > [    1.934473] [DEBUG]ufshcd_update_uic_error: UECN:0x0
> > [    1.944688] [DEBUG]ufshcd_update_uic_error: UECT:0x0
> > [    1.954901] [DEBUG]ufshcd_update_uic_error: UECDME:0x0
> > 
> > I found out that the PHY error pops out right after UFS device gets
> > reset in the 2nd init. After having this change in place, the PA/DL
> > errors are gone.
> 
> Hi Mani,
> 
> There is another way that adding a new vops that call XXX_host_reset() from
> soc vendor driver. in this way, we can call this vops in core layer without
> the dependency of device reset.
> due to we already observed such error and received many same reports from
> different OEMs, we need to fix it in some way.
> if you think above way is available, I will update new patch in soon. Or
> could you give us other suggestion?
> 

First, please describe the issue in detail. How the issue is getting triggered
and then justify your change. I do not have access to the bug reports that you
received.

- Mani

> -Ziqi
> 
> > 
> > Thanks,
> > Can Guo.
> > > 
> > > - Mani
> > > 
> > > > Signed-off-by: Ziqi Chen <quic_ziqichen@...cinc.com>
> > > > ---
> > > >   drivers/ufs/host/ufs-qcom.c | 13 +++++++------
> > > >   1 file changed, 7 insertions(+), 6 deletions(-)
> > > > 
> > > > diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> > > > index 96cb8b5..43163d3 100644
> > > > --- a/drivers/ufs/host/ufs-qcom.c
> > > > +++ b/drivers/ufs/host/ufs-qcom.c
> > > > @@ -445,12 +445,6 @@ static int
> > > > ufs_qcom_power_up_sequence(struct ufs_hba *hba)
> > > >       struct phy *phy = host->generic_phy;
> > > >       int ret;
> > > > -    /* Reset UFS Host Controller and PHY */
> > > > -    ret = ufs_qcom_host_reset(hba);
> > > > -    if (ret)
> > > > -        dev_warn(hba->dev, "%s: host reset returned %d\n",
> > > > -                  __func__, ret);
> > > > -
> > > >       /* phy initialization - calibrate the phy */
> > > >       ret = phy_init(phy);
> > > >       if (ret) {
> > > > @@ -1709,6 +1703,13 @@ static void ufs_qcom_dump_dbg_regs(struct
> > > > ufs_hba *hba)
> > > >   static int ufs_qcom_device_reset(struct ufs_hba *hba)
> > > >   {
> > > >       struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> > > > +    int ret = 0;
> > > > +
> > > > +    /* Reset UFS Host Controller and PHY */
> > > > +    ret = ufs_qcom_host_reset(hba);
> > > > +    if (ret)
> > > > +        dev_warn(hba->dev, "%s: host reset returned %d\n",
> > > > +                  __func__, ret);
> > > >       /* reset gpio is optional */
> > > >       if (!host->device_reset)
> > > > -- 
> > > > 2.7.4
> > > > 
> > > 

-- 
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