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From: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
To: Vinod Koul <vkoul@kernel.org>
Cc: Can Guo <cang@codeaurora.org>,
	asutoshd@codeaurora.org, nguyenb@codeaurora.org,
	Rajendra Nayak <rnayak@codeaurora.org>,
	linux-scsi@vger.kernel.org, kernel-team@android.com,
	saravanak@google.com, salyzyn@google.com,
	Andy Gross <agross@kernel.org>,
	Alim Akhtar <alim.akhtar@samsung.com>,
	Avri Altman <avri.altman@wdc.com>,
	Pedro Sousa <pedrom.sousa@synopsys.com>,
	"James E.J. Bottomley" <jejb@linux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	"open list:ARM/QUALCOMM SUPPORT" <linux-arm-msm@vger.kernel.org>,
	open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v5 2/7] scsi: ufs-qcom: Add reset control support for host controller
Date: Mon, 16 Dec 2019 12:12:19 -0700
Message-ID: <CAOCk7NpAp+DHBp-owyKGgJFLRajfSQR6ff1XMmAj6A4nM3VnMQ@mail.gmail.com> (raw)
In-Reply-To: <20191216190415.GL2536@vkoul-mobl>

On Mon, Dec 16, 2019 at 12:05 PM Vinod Koul <vkoul@kernel.org> wrote:
>
> Hi Can,
>
> On 14-11-19, 22:09, Can Guo wrote:
> > Add reset control for host controller so that host controller can be reset
> > as required in its power up sequence.
>
> I am seeing a regression on UFS on SM8150-mtp with this patch. I think
> Jeff is seeing same one lenove laptop on 8998.

Confirmed.

>
> 845 does not seem to have this issue and only thing I can see is that on
> sm8150 and 8998 we define reset as:
>
>                         resets = <&gcc GCC_UFS_BCR>;
>                         reset-names = "rst";
>
> Thanks
>
> >
> > Signed-off-by: Can Guo <cang@codeaurora.org>
> > ---
> >  drivers/scsi/ufs/ufs-qcom.c | 53 +++++++++++++++++++++++++++++++++++++++++++++
> >  drivers/scsi/ufs/ufs-qcom.h |  3 +++
> >  2 files changed, 56 insertions(+)
> >
> > diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
> > index a5b7148..c69c29a1c 100644
> > --- a/drivers/scsi/ufs/ufs-qcom.c
> > +++ b/drivers/scsi/ufs/ufs-qcom.c
> > @@ -246,6 +246,44 @@ static void ufs_qcom_select_unipro_mode(struct ufs_qcom_host *host)
> >       mb();
> >  }
> >
> > +/**
> > + * ufs_qcom_host_reset - reset host controller and PHY
> > + */
> > +static int ufs_qcom_host_reset(struct ufs_hba *hba)
> > +{
> > +     int ret = 0;
> > +     struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> > +
> > +     if (!host->core_reset) {
> > +             dev_warn(hba->dev, "%s: reset control not set\n", __func__);
> > +             goto out;
> > +     }
> > +
> > +     ret = reset_control_assert(host->core_reset);
> > +     if (ret) {
> > +             dev_err(hba->dev, "%s: core_reset assert failed, err = %d\n",
> > +                              __func__, ret);
> > +             goto out;
> > +     }
> > +
> > +     /*
> > +      * The hardware requirement for delay between assert/deassert
> > +      * is at least 3-4 sleep clock (32.7KHz) cycles, which comes to
> > +      * ~125us (4/32768). To be on the safe side add 200us delay.
> > +      */
> > +     usleep_range(200, 210);
> > +
> > +     ret = reset_control_deassert(host->core_reset);
> > +     if (ret)
> > +             dev_err(hba->dev, "%s: core_reset deassert failed, err = %d\n",
> > +                              __func__, ret);
> > +
> > +     usleep_range(1000, 1100);
> > +
> > +out:
> > +     return ret;
> > +}
> > +
> >  static int ufs_qcom_power_up_sequence(struct ufs_hba *hba)
> >  {
> >       struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> > @@ -254,6 +292,12 @@ static int ufs_qcom_power_up_sequence(struct ufs_hba *hba)
> >       bool is_rate_B = (UFS_QCOM_LIMIT_HS_RATE == PA_HS_MODE_B)
> >                                                       ? true : false;
> >
> > +     /* 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);
> > +
> >       if (is_rate_B)
> >               phy_set_mode(phy, PHY_MODE_UFS_HS_B);
> >
> > @@ -1101,6 +1145,15 @@ static int ufs_qcom_init(struct ufs_hba *hba)
> >       host->hba = hba;
> >       ufshcd_set_variant(hba, host);
> >
> > +     /* Setup the reset control of HCI */
> > +     host->core_reset = devm_reset_control_get(hba->dev, "rst");
> > +     if (IS_ERR(host->core_reset)) {
> > +             err = PTR_ERR(host->core_reset);
> > +             dev_warn(dev, "Failed to get reset control %d\n", err);
> > +             host->core_reset = NULL;
> > +             err = 0;
> > +     }
> > +
> >       /* Fire up the reset controller. Failure here is non-fatal. */
> >       host->rcdev.of_node = dev->of_node;
> >       host->rcdev.ops = &ufs_qcom_reset_ops;
> > diff --git a/drivers/scsi/ufs/ufs-qcom.h b/drivers/scsi/ufs/ufs-qcom.h
> > index d401f17..2d95e7c 100644
> > --- a/drivers/scsi/ufs/ufs-qcom.h
> > +++ b/drivers/scsi/ufs/ufs-qcom.h
> > @@ -6,6 +6,7 @@
> >  #define UFS_QCOM_H_
> >
> >  #include <linux/reset-controller.h>
> > +#include <linux/reset.h>
> >
> >  #define MAX_UFS_QCOM_HOSTS   1
> >  #define MAX_U32                 (~(u32)0)
> > @@ -233,6 +234,8 @@ struct ufs_qcom_host {
> >       u32 dbg_print_en;
> >       struct ufs_qcom_testbus testbus;
> >
> > +     /* Reset control of HCI */
> > +     struct reset_control *core_reset;
> >       struct reset_controller_dev rcdev;
> >
> >       struct gpio_desc *device_reset;
> > --
> > The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> > a Linux Foundation Collaborative Project
>
> --
> ~Vinod

  reply index

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-15  6:09 [PATCH v5 0/7] UFS driver general fixes bundle 3 Can Guo
2019-11-15  6:09 ` [PATCH v5 1/7] scsi: ufs: Add device reset in link recovery path Can Guo
2019-11-15  6:25   ` Stanley Chu
2019-11-15  6:09 ` [PATCH v5 2/7] scsi: ufs-qcom: Add reset control support for host controller Can Guo
2019-11-15 10:08   ` Avri Altman
2019-12-16 19:04   ` Vinod Koul
2019-12-16 19:12     ` Jeffrey Hugo [this message]
2019-12-17  0:37       ` cang
2019-12-17  4:13         ` Vinod Koul
2019-12-17  7:10           ` cang
2019-12-17  9:24             ` Vinod Koul
2019-12-17 10:09               ` cang
2019-12-17 15:08                 ` Vinod Koul
2019-12-17 16:00                   ` Jeffrey Hugo
2019-12-17 18:44                     ` cang
2019-12-18  4:12                       ` Vinod Koul
2019-12-19  7:12                         ` cang
2019-12-19 14:21                           ` Vinod Koul
2019-12-19 14:25                             ` Jeffrey Hugo
2019-12-19 14:52                               ` Vinod Koul
2019-12-20  0:30                                 ` cang
2019-11-15  6:09 ` [PATCH v5 3/7] scsi: ufs: Fix up auto hibern8 enablement Can Guo
2019-11-15  6:35   ` Stanley Chu
2019-11-15  7:03     ` Can Guo
2019-11-15  7:18       ` Stanley Chu
2019-11-15 12:27         ` Can Guo
2019-11-15 13:46           ` Stanley Chu
2019-11-15  6:09 ` [PATCH v5 4/7] scsi: ufs: Fix register dump caused sleep in atomic context Can Guo
2019-11-15  6:09 ` [PATCH v5 5/7] scsi: ufs: Fix irq return code Can Guo
2019-11-15  6:09 ` [PATCH v5 6/7] scsi: ufs: Abort gating if clock on request is pending Can Guo
2019-11-15  6:09 ` [PATCH v5 7/7] scsi: ufs: Fix error handing during hibern8 enter Can Guo
2019-11-15 10:12   ` Avri Altman
2019-11-17 16:36   ` [EXT] " Bean Huo (beanhuo)
2019-11-19  4:28 ` [PATCH v5 0/7] UFS driver general fixes bundle 3 Martin K. Petersen

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