linux-kernel - Re: [PATCH 1/2] ufs: host: ufs-qcom: Clear qunipro_g4

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Date:   Mon, 21 Nov 2022 14:37:54 +0200
From:   Abel Vesa <abel.vesa@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Avri Altman <avri.altman@....com>,
        Bart Van Assche <bvanassche@....org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-scsi@...r.kernel.org
Subject: Re: [PATCH 1/2] ufs: host: ufs-qcom: Clear qunipro_g4_sel for HW
 version major 5

On 22-11-16 13:28:53, Konrad Dybcio wrote:
> 
> 
> On 16/11/2022 13:17, Abel Vesa wrote:
> > On SM8550, depending on the Qunipro, we can run with G5 or G4.
> > For now, when the major version is 5 or above, we go with G5.
> > Therefore, we need to specifically tell UFS HC that.
> > 
> > Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> > ---
> >   drivers/ufs/host/ufs-qcom.c | 4 ++++
> >   drivers/ufs/host/ufs-qcom.h | 2 ++
> >   2 files changed, 6 insertions(+)
> > 
> > diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> > index ca60a5b0292b..72334aefe81c 100644
> > --- a/drivers/ufs/host/ufs-qcom.c
> > +++ b/drivers/ufs/host/ufs-qcom.c
> > @@ -227,6 +227,10 @@ static void ufs_qcom_select_unipro_mode(struct ufs_qcom_host *host)
> >   	ufshcd_rmwl(host->hba, QUNIPRO_SEL,
> >   		   ufs_qcom_cap_qunipro(host) ? QUNIPRO_SEL : 0,
> >   		   REG_UFS_CFG1);
> > +
> > +	if (host->hw_ver.major == 0x05)
> > +		ufshcd_rmwl(host->hba, QUNIPRO_G4_SEL, 0, REG_UFS_CFG0);
> > +
> >   	/* make sure above configuration is applied before we return */
> >   	mb();
> >   }
> > diff --git a/drivers/ufs/host/ufs-qcom.h b/drivers/ufs/host/ufs-qcom.h
> > index 751ded3e3531..10621055bf7f 100644
> > --- a/drivers/ufs/host/ufs-qcom.h
> > +++ b/drivers/ufs/host/ufs-qcom.h
> > @@ -36,6 +36,7 @@ enum {
> >   	/* On older UFS revisions, this register is called "RETRY_TIMER_REG" */
> >   	REG_UFS_PARAM0                      = 0xD0,
> >   	REG_UFS_PA_LINK_STARTUP_TIMER       = 0xD8,
> > +	REG_UFS_CFG0                        = 0xD8,
> Are you sure these two should point to the same register? Maybe it deserves
> some kind of a comment?

The REG_UFS_PA_LINK_STARTUP_TIMER is used by non qunipro variants. (UFS
versions below 2.x)

The REG_UFS_CFG0 is used by qunipro variants. (UFS versions above 2.x).

Will add a comment to the later one that would look like this:
"/* Found on UFS versions above 2.x only */"

Thanks,
Abel

> 
> Konrad
> >   	REG_UFS_CFG1                        = 0xDC,
> >   	REG_UFS_CFG2                        = 0xE0,
> >   	REG_UFS_HW_VERSION                  = 0xE4,
> > @@ -75,6 +76,7 @@ enum {
> >   /* bit definitions for REG_UFS_CFG1 register */
> >   #define QUNIPRO_SEL		BIT(0)
> > +#define QUNIPRO_G4_SEL		BIT(5)
> >   #define UFS_PHY_SOFT_RESET	BIT(1)
> >   #define UTP_DBG_RAMS_EN		BIT(17)
> >   #define TEST_BUS_EN		BIT(18)