linux-kernel - Re: [PATCH v4 8/8] scsi: ufs: Select INITIAL adapt for HS Gear4

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Date:   Fri, 24 Jan 2020 10:03:35 -0800
From:   "Asutosh Das (asd)" <asutoshd@...eaurora.org>
To:     Can Guo <cang@...eaurora.org>, nguyenb@...eaurora.org,
        hongwus@...eaurora.org, rnayak@...eaurora.org,
        linux-scsi@...r.kernel.org, kernel-team@...roid.com,
        saravanak@...gle.com, salyzyn@...gle.com
Cc:     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>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Venkat Gopalakrishnan <venkatg@...eaurora.org>,
        Tomas Winkler <tomas.winkler@...el.com>,
        Bean Huo <beanhuo@...ron.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Allison Randal <allison@...utok.net>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 8/8] scsi: ufs: Select INITIAL adapt for HS Gear4

On 1/22/2020 11:25 PM, Can Guo wrote:
> ADAPT is added specifically for HS Gear4 mode only, select INITIAL adapt
> before do power mode change to G4 and select no adapt before switch to
> non-G4 modes.
> 
> Signed-off-by: Can Guo <cang@...eaurora.org>
> ---

LGTM.

Reviewed-by: Asutosh Das <asutoshd@...eaurora.org>

>   drivers/scsi/ufs/ufshcd.c | 14 +++++++++++++-
>   drivers/scsi/ufs/ufshci.h |  1 +
>   drivers/scsi/ufs/unipro.h |  7 +++++++
>   3 files changed, 21 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 1ee2187..f6d4828 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -4134,6 +4134,17 @@ static int ufshcd_change_power_mode(struct ufs_hba *hba,
>   		ufshcd_dme_set(hba, UIC_ARG_MIB(PA_HSSERIES),
>   						pwr_mode->hs_rate);
>   
> +	if (hba->ufs_version >= UFSHCI_VERSION_30) {
> +		if (pwr_mode->gear_tx == UFS_HS_G4)
> +			/* INITIAL ADAPT */
> +			ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TXHSADAPTTYPE),
> +					PA_INITIAL_ADAPT);
> +		else
> +			/* NO ADAPT */
> +			ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TXHSADAPTTYPE),
> +					PA_NO_ADAPT);
> +	}
> +
>   	ret = ufshcd_uic_change_pwr_mode(hba, pwr_mode->pwr_rx << 4
>   			| pwr_mode->pwr_tx);
>   
> @@ -8422,7 +8433,8 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
>   	if ((hba->ufs_version != UFSHCI_VERSION_10) &&
>   	    (hba->ufs_version != UFSHCI_VERSION_11) &&
>   	    (hba->ufs_version != UFSHCI_VERSION_20) &&
> -	    (hba->ufs_version != UFSHCI_VERSION_21))
> +	    (hba->ufs_version != UFSHCI_VERSION_21) &&
> +	    (hba->ufs_version != UFSHCI_VERSION_30))
>   		dev_err(hba->dev, "invalid UFS version 0x%x\n",
>   			hba->ufs_version);
>   
> diff --git a/drivers/scsi/ufs/ufshci.h b/drivers/scsi/ufs/ufshci.h
> index dbb75cd..95b4b03 100644
> --- a/drivers/scsi/ufs/ufshci.h
> +++ b/drivers/scsi/ufs/ufshci.h
> @@ -104,6 +104,7 @@ enum {
>   	UFSHCI_VERSION_11 = 0x00010100, /* 1.1 */
>   	UFSHCI_VERSION_20 = 0x00000200, /* 2.0 */
>   	UFSHCI_VERSION_21 = 0x00000210, /* 2.1 */
> +	UFSHCI_VERSION_30 = 0x00000300, /* 3.0 */
>   };
>   
>   /*
> diff --git a/drivers/scsi/ufs/unipro.h b/drivers/scsi/ufs/unipro.h
> index f539f87..960d175 100644
> --- a/drivers/scsi/ufs/unipro.h
> +++ b/drivers/scsi/ufs/unipro.h
> @@ -146,6 +146,12 @@
>   #define PA_SLEEPNOCONFIGTIME	0x15A2
>   #define PA_STALLNOCONFIGTIME	0x15A3
>   #define PA_SAVECONFIGTIME	0x15A4
> +#define PA_TXHSADAPTTYPE	0x15D4
> +
> +/* Adpat type for PA_TXHSADAPTTYPE attribute */
> +#define PA_REFRESH_ADAPT	0x00
> +#define PA_INITIAL_ADAPT	0x01
> +#define PA_NO_ADAPT		0x03
>   
>   #define PA_TACTIVATE_TIME_UNIT_US	10
>   #define PA_HIBERN8_TIME_UNIT_US		100
> @@ -192,6 +198,7 @@ enum ufs_hs_gear_tag {
>   	UFS_HS_G1,		/* HS Gear 1 (default for reset) */
>   	UFS_HS_G2,		/* HS Gear 2 */
>   	UFS_HS_G3,		/* HS Gear 3 */
> +	UFS_HS_G4,		/* HS Gear 4 */
>   };
>   
>   enum ufs_unipro_ver {
> 


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