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

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Message-ID: <20231128111528.GR3088@thinkpad>
Date:   Tue, 28 Nov 2023 16:45:28 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Can Guo <quic_cang@...cinc.com>
Cc:     Ziqi Chen <quic_ziqichen@...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 Wed, Nov 22, 2023 at 02:14:57PM +0800, 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?
> > 
> > > 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).
> 

I do not suspect the intention of this patch, but I do not like the way how it
is being done. Even if the reset has to be moved, the patch description should
describe how it fixes the issue.

- Mani

> [    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.
> 
> 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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