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Date: Thu, 28 Nov 2019 19:29:29 +0530
From: "Alim Akhtar" <alim.akhtar@...sung.com>
To: "'sheebab'" <sheebab@...ence.com>, <avri.altman@....com>,
<pedrom.sousa@...opsys.com>, <jejb@...ux.ibm.com>,
<martin.petersen@...cle.com>, <stanley.chu@...iatek.com>,
<beanhuo@...ron.com>, <yuehaibing@...wei.com>,
<linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<vigneshr@...com>, <linux-block@...r.kernel.org>
Cc: <rafalc@...ence.com>, <mparab@...ence.com>
Subject: RE: [PATCH RESEND 2/2] scsi: ufs: Update L4 attributes on manual
hibern8 exit in Cadence UFS.
> -----Original Message-----
> From: sheebab <sheebab@...ence.com>
> Sent: 19 November 2019 12:35
> To: alim.akhtar@...sung.com; avri.altman@....com;
> pedrom.sousa@...opsys.com; jejb@...ux.ibm.com;
> martin.petersen@...cle.com; stanley.chu@...iatek.com;
> beanhuo@...ron.com; yuehaibing@...wei.com; linux-scsi@...r.kernel.org;
> linux-kernel@...r.kernel.org; vigneshr@...com; linux-block@...r.kernel.org
> Cc: rafalc@...ence.com; mparab@...ence.com; sheebab
> <sheebab@...ence.com>
> Subject: [PATCH RESEND 2/2] scsi: ufs: Update L4 attributes on manual
hibern8
> exit in Cadence UFS.
>
> Backup L4 attributes duirng manual hibern8 entry and restore the L4
attributes
> on manual hibern8 exit as per JESD220C.
>
> Signed-off-by: sheebab <sheebab@...ence.com>
> ---
Reviewed-by: Alim Akhtar <alim.akhtar@...sung.com>
> drivers/scsi/ufs/cdns-pltfrm.c | 97
> +++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 95 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/scsi/ufs/cdns-pltfrm.c
b/drivers/scsi/ufs/cdns-pltfrm.c index
> adbbd60..5510567 100644
> --- a/drivers/scsi/ufs/cdns-pltfrm.c
> +++ b/drivers/scsi/ufs/cdns-pltfrm.c
> @@ -19,6 +19,14 @@
>
> #define CDNS_UFS_REG_HCLKDIV 0xFC
> #define CDNS_UFS_REG_PHY_XCFGD1 0x113C
> +#define CDNS_UFS_MAX 12
> +
> +struct cdns_ufs_host {
> + /**
> + * cdns_ufs_dme_attr_val - for storing L4 attributes
> + */
> + u32 cdns_ufs_dme_attr_val[CDNS_UFS_MAX];
> +};
>
> /**
> * cdns_ufs_enable_intr - enable interrupts @@ -47,6 +55,77 @@ static
void
> cdns_ufs_disable_intr(struct ufs_hba *hba, u32 intrs) }
>
> /**
> + * cdns_ufs_get_l4_attr - get L4 attributes on local side
> + * @hba: per adapter instance
> + *
> + */
> +static void cdns_ufs_get_l4_attr(struct ufs_hba *hba) {
> + struct cdns_ufs_host *host = ufshcd_get_variant(hba);
> +
> + ufshcd_dme_get(hba, UIC_ARG_MIB(T_PEERDEVICEID),
> + &host->cdns_ufs_dme_attr_val[0]);
> + ufshcd_dme_get(hba, UIC_ARG_MIB(T_PEERCPORTID),
> + &host->cdns_ufs_dme_attr_val[1]);
> + ufshcd_dme_get(hba, UIC_ARG_MIB(T_TRAFFICCLASS),
> + &host->cdns_ufs_dme_attr_val[2]);
> + ufshcd_dme_get(hba, UIC_ARG_MIB(T_PROTOCOLID),
> + &host->cdns_ufs_dme_attr_val[3]);
> + ufshcd_dme_get(hba, UIC_ARG_MIB(T_CPORTFLAGS),
> + &host->cdns_ufs_dme_attr_val[4]);
> + ufshcd_dme_get(hba, UIC_ARG_MIB(T_TXTOKENVALUE),
> + &host->cdns_ufs_dme_attr_val[5]);
> + ufshcd_dme_get(hba, UIC_ARG_MIB(T_RXTOKENVALUE),
> + &host->cdns_ufs_dme_attr_val[6]);
> + ufshcd_dme_get(hba, UIC_ARG_MIB(T_LOCALBUFFERSPACE),
> + &host->cdns_ufs_dme_attr_val[7]);
> + ufshcd_dme_get(hba, UIC_ARG_MIB(T_PEERBUFFERSPACE),
> + &host->cdns_ufs_dme_attr_val[8]);
> + ufshcd_dme_get(hba, UIC_ARG_MIB(T_CREDITSTOSEND),
> + &host->cdns_ufs_dme_attr_val[9]);
> + ufshcd_dme_get(hba, UIC_ARG_MIB(T_CPORTMODE),
> + &host->cdns_ufs_dme_attr_val[10]);
> + ufshcd_dme_get(hba, UIC_ARG_MIB(T_CONNECTIONSTATE),
> + &host->cdns_ufs_dme_attr_val[11]);
> +}
> +
> +/**
> + * cdns_ufs_set_l4_attr - set L4 attributes on local side
> + * @hba: per adapter instance
> + *
> + */
> +static void cdns_ufs_set_l4_attr(struct ufs_hba *hba) {
> + struct cdns_ufs_host *host = ufshcd_get_variant(hba);
> +
> + ufshcd_dme_set(hba, UIC_ARG_MIB(T_CONNECTIONSTATE), 0);
> + ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERDEVICEID),
> + host->cdns_ufs_dme_attr_val[0]);
> + ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERCPORTID),
> + host->cdns_ufs_dme_attr_val[1]);
> + ufshcd_dme_set(hba, UIC_ARG_MIB(T_TRAFFICCLASS),
> + host->cdns_ufs_dme_attr_val[2]);
> + ufshcd_dme_set(hba, UIC_ARG_MIB(T_PROTOCOLID),
> + host->cdns_ufs_dme_attr_val[3]);
> + ufshcd_dme_set(hba, UIC_ARG_MIB(T_CPORTFLAGS),
> + host->cdns_ufs_dme_attr_val[4]);
> + ufshcd_dme_set(hba, UIC_ARG_MIB(T_TXTOKENVALUE),
> + host->cdns_ufs_dme_attr_val[5]);
> + ufshcd_dme_set(hba, UIC_ARG_MIB(T_RXTOKENVALUE),
> + host->cdns_ufs_dme_attr_val[6]);
> + ufshcd_dme_set(hba, UIC_ARG_MIB(T_LOCALBUFFERSPACE),
> + host->cdns_ufs_dme_attr_val[7]);
> + ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERBUFFERSPACE),
> + host->cdns_ufs_dme_attr_val[8]);
> + ufshcd_dme_set(hba, UIC_ARG_MIB(T_CREDITSTOSEND),
> + host->cdns_ufs_dme_attr_val[9]);
> + ufshcd_dme_set(hba, UIC_ARG_MIB(T_CPORTMODE),
> + host->cdns_ufs_dme_attr_val[10]);
> + ufshcd_dme_set(hba, UIC_ARG_MIB(T_CONNECTIONSTATE),
> + host->cdns_ufs_dme_attr_val[11]); }
> +
> +/**
> * Sets HCLKDIV register value based on the core_clk
> * @hba: host controller instance
> *
> @@ -134,6 +213,7 @@ static void cdns_ufs_hibern8_notify(struct ufs_hba
> *hba, enum uic_cmd_dme cmd,
> * before manual hibernate entry.
> */
> cdns_ufs_enable_intr(hba, UFSHCD_UIC_HIBERN8_MASK);
> + cdns_ufs_get_l4_attr(hba);
> }
> if (status == POST_CHANGE && cmd == UIC_CMD_DME_HIBER_EXIT) {
> /**
> @@ -141,6 +221,7 @@ static void cdns_ufs_hibern8_notify(struct ufs_hba
> *hba, enum uic_cmd_dme cmd,
> * after manual hibern8 exit.
> */
> cdns_ufs_disable_intr(hba, UFSHCD_UIC_HIBERN8_MASK);
> + cdns_ufs_set_l4_attr(hba);
> }
> }
>
> @@ -245,15 +326,27 @@ static int cdns_ufs_pltfrm_probe(struct
> platform_device *pdev)
> const struct of_device_id *of_id;
> struct ufs_hba_variant_ops *vops;
> struct device *dev = &pdev->dev;
> + struct cdns_ufs_host *host;
> + struct ufs_hba *hba;
>
> of_id = of_match_node(cdns_ufs_of_match, dev->of_node);
> vops = (struct ufs_hba_variant_ops *)of_id->data;
>
> /* Perform generic probe */
> err = ufshcd_pltfrm_init(pdev, vops);
> - if (err)
> + if (err) {
> dev_err(dev, "ufshcd_pltfrm_init() failed %d\n", err);
> -
> + goto out;
> + }
> + host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
> + if (!host) {
> + err = -ENOMEM;
> + dev_err(dev, "%s: no memory for cdns host\n", __func__);
> + goto out;
> + }
> + hba = platform_get_drvdata(pdev);
> + ufshcd_set_variant(hba, host);
> +out:
> return err;
> }
>
> --
> 2.7.4
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