linux-kernel - Re: [PATCH] scsi: ufs: create a hook for unipro dme control

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Date:   Mon, 08 Feb 2021 21:42:05 +0100
From:   Bean Huo <huobean@...il.com>
To:     Leo Liou <leoliou@...gle.com>, agross@...nel.org,
        bjorn.andersson@...aro.org, alim.akhtar@...sung.com,
        avri.altman@....com, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, stanley.chu@...iatek.com,
        cang@...eaurora.org, asutoshd@...eaurora.org, beanhuo@...ron.com,
        jaegeuk@...nel.org, adrian.hunter@...el.com, satyat@...gle.com,
        essuuj@...il.com, linux-arm-msm@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: ufs: create a hook for unipro dme control

On Mon, 2021-02-08 at 20:56 +0800, Leo Liou wrote:
> Based on ufshci spec, it defines that "Offset C0h to FFh" belong
> to vendor specific. If cpu vendor doesn't support these commands, it
> makes the dme errors:
> 
> ufs: dme-set: attr-id 0xd041 val 0x1fff failed 0 retries
> ufs: dme-set: attr-id 0xd042 val 0xffff failed 0 retries
> ufs: dme-set: attr-id 0xd043 val 0x7fff failed 0 retries
> 

Hi Leo
"Offset C0h to FFh" registers belong to the UFSHCI, but the attribtes
you moved belong to "DME Attributes for DME_SET-based High Level Power
Mode Control" defined in Unipro and doesen't say they are vendor-
defined attributes. How these two are associated?


Kind regards,
Bean

> Create a hook for unipro vendor-specific commands.
> 
> Signed-off-by: Leo Liou <leoliou@...gle.com>
> ---
>  drivers/scsi/ufs/ufs-qcom.c | 11 +++++++++++
>  drivers/scsi/ufs/ufs-qcom.h |  5 +++++
>  drivers/scsi/ufs/ufshcd.c   |  7 +------
>  drivers/scsi/ufs/ufshcd.h   |  8 ++++++++
>  drivers/scsi/ufs/unipro.h   |  4 ----
>  5 files changed, 25 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-
> qcom.c
> index 2206b1e4b774..f2a925587029 100644
> --- a/drivers/scsi/ufs/ufs-qcom.c
> +++ b/drivers/scsi/ufs/ufs-qcom.c
> @@ -759,6 +759,16 @@ static int ufs_qcom_pwr_change_notify(struct
> ufs_hba *hba,
>  	return ret;
>  }
>  
> +static void ufs_qcom_unipro_dme_set(struct ufs_hba *hba)
> +{
> +	ufshcd_dme_set(hba,
> UIC_ARG_MIB(DME_LocalFC0ProtectionTimeOutVal),
> +		       DL_FC0ProtectionTimeOutVal_Default);
> +	ufshcd_dme_set(hba, UIC_ARG_MIB(DME_LocalTC0ReplayTimeOutVal),
> +		       DL_TC0ReplayTimeOutVal_Default);
> +	ufshcd_dme_set(hba, UIC_ARG_MIB(DME_LocalAFC0ReqTimeOutVal),
> +		       DL_AFC0ReqTimeOutVal_Default);
> +}
> +
>  static int ufs_qcom_quirk_host_pa_saveconfigtime(struct ufs_hba
> *hba)
>  {
>  	int err;
> @@ -1469,6 +1479,7 @@ static const struct ufs_hba_variant_ops
> ufs_hba_qcom_vops = {
>  	.hce_enable_notify      = ufs_qcom_hce_enable_notify,
>  	.link_startup_notify    = ufs_qcom_link_startup_notify,
>  	.pwr_change_notify	= ufs_qcom_pwr_change_notify,
> +	.unipro_dme_set		= ufs_qcom_unipro_dme_set,
>  	.apply_dev_quirks	= ufs_qcom_apply_dev_quirks,
>  	.suspend		= ufs_qcom_suspend,
>  	.resume			= ufs_qcom_resume,
> diff --git a/drivers/scsi/ufs/ufs-qcom.h b/drivers/scsi/ufs/ufs-
> qcom.h
> index 8208e3a3ef59..83db97caaa1b 100644
> --- a/drivers/scsi/ufs/ufs-qcom.h
> +++ b/drivers/scsi/ufs/ufs-qcom.h
> @@ -124,6 +124,11 @@ enum {
>  /* QUniPro Vendor specific attributes */
>  #define PA_VS_CONFIG_REG1	0x9000
>  #define DME_VS_CORE_CLK_CTRL	0xD002
> +
> +#define DME_LocalFC0ProtectionTimeOutVal	0xD041
> +#define DME_LocalTC0ReplayTimeOutVal		0xD042
> +#define DME_LocalAFC0ReqTimeOutVal		0xD043
> +
>  /* bit and mask definitions for DME_VS_CORE_CLK_CTRL attribute */
>  #define DME_VS_CORE_CLK_CTRL_CORE_CLK_DIV_EN_BIT		BIT(8)
>  #define DME_VS_CORE_CLK_CTRL_MAX_CORE_CLK_1US_CYCLES_MASK	0xFF
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index fb32d122f2e3..8ba2ce8c5d0c 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -4231,12 +4231,7 @@ static int ufshcd_change_power_mode(struct
> ufs_hba *hba,
>  	ufshcd_dme_set(hba, UIC_ARG_MIB(PA_PWRMODEUSERDATA5),
>  			DL_AFC1ReqTimeOutVal_Default);
>  
> -	ufshcd_dme_set(hba,
> UIC_ARG_MIB(DME_LocalFC0ProtectionTimeOutVal),
> -			DL_FC0ProtectionTimeOutVal_Default);
> -	ufshcd_dme_set(hba, UIC_ARG_MIB(DME_LocalTC0ReplayTimeOutVal),
> -			DL_TC0ReplayTimeOutVal_Default);
> -	ufshcd_dme_set(hba, UIC_ARG_MIB(DME_LocalAFC0ReqTimeOutVal),
> -			DL_AFC0ReqTimeOutVal_Default);
> +	ufshcd_vops_unipro_dme_set(hba);
>  
>  	ret = ufshcd_uic_change_pwr_mode(hba, pwr_mode->pwr_rx << 4
>  			| pwr_mode->pwr_tx);
> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
> index aa9ea3552323..b8c90bee7503 100644
> --- a/drivers/scsi/ufs/ufshcd.h
> +++ b/drivers/scsi/ufs/ufshcd.h
> @@ -311,6 +311,7 @@ struct ufs_pwr_mode_info {
>   * @pwr_change_notify: called before and after a power mode change
>   *			is carried out to allow vendor spesific
> capabilities
>   *			to be set.
> + * @unipro_dme_set: called when vendor speicific control is needed
>   * @setup_xfer_req: called before any transfer request is issued
>   *                  to set some things
>   * @setup_task_mgmt: called before any task management request is
> issued
> @@ -342,6 +343,7 @@ struct ufs_hba_variant_ops {
>  					enum ufs_notify_change_status
> status,
>  					struct ufs_pa_layer_attr *,
>  					struct ufs_pa_layer_attr *);
> +	void    (*unipro_dme_set)(struct ufs_hba *hba);
>  	void	(*setup_xfer_req)(struct ufs_hba *, int, bool);
>  	void	(*setup_task_mgmt)(struct ufs_hba *, int, u8);
>  	void    (*hibern8_notify)(struct ufs_hba *, enum uic_cmd_dme,
> @@ -1161,6 +1163,12 @@ static inline int
> ufshcd_vops_pwr_change_notify(struct ufs_hba *hba,
>  	return -ENOTSUPP;
>  }
>  
> +static inline void ufshcd_vops_unipro_dme_set(struct ufs_hba *hba)
> +{
> +	if (hba->vops && hba->vops->unipro_dme_set)
> +		return hba->vops->unipro_dme_set(hba);
> +}
> +
>  static inline void ufshcd_vops_setup_xfer_req(struct ufs_hba *hba,
> int tag,
>  					bool is_scsi_cmd)
>  {
> diff --git a/drivers/scsi/ufs/unipro.h b/drivers/scsi/ufs/unipro.h
> index 8e9e486a4f7b..224162e5afd8 100644
> --- a/drivers/scsi/ufs/unipro.h
> +++ b/drivers/scsi/ufs/unipro.h
> @@ -192,10 +192,6 @@
>  #define DL_TC1ReplayTimeOutVal_Default		65535
>  #define DL_AFC1ReqTimeOutVal_Default		32767
>  
> -#define DME_LocalFC0ProtectionTimeOutVal	0xD041
> -#define DME_LocalTC0ReplayTimeOutVal		0xD042
> -#define DME_LocalAFC0ReqTimeOutVal		0xD043
> -
>  /* PA power modes */
>  enum {
>  	FAST_MODE	= 1,