linux-kernel - Re: [PATCH 1/6] scsi: ufs: ufs-qcom: Setup host power mode during init

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Date:   Thu, 14 Sep 2023 18:10:08 +0530
From:   Nitin Rawat <quic_nitirawa@...cinc.com>
To:     Can Guo <quic_cang@...cinc.com>, <mani@...nel.org>,
        <quic_nguyenb@...cinc.com>, <martin.petersen@...cle.com>
CC:     <linux-scsi@...r.kernel.org>, Andy Gross <agross@...nel.org>,
        "Bjorn Andersson" <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "open list:UNIVERSAL FLASH STORAGE HOST CONTROLLER DRIVER..." 
        <linux-arm-msm@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/6] scsi: ufs: ufs-qcom: Setup host power mode during
 init



On 9/11/2023 11:29 AM, Can Guo wrote:
> Setup host power mode and its limitations during UFS host driver init to
> avoid repetitive work during every power mode change.
> 
> Co-developed-by: Bao D. Nguyen <quic_nguyenb@...cinc.com>
> Signed-off-by: Can Guo <quic_cang@...cinc.com>
> Signed-off-by: Bao D. Nguyen <quic_nguyenb@...cinc.com>

Hi Can,

Patch looks good. Please can you just change the order of Signed-off-by.
I think it should be like below:

Co-developed-by: Bao D. Nguyen <quic_nguyenb@...cinc.com>
Signed-off-by: Bao D. Nguyen <quic_nguyenb@...cinc.com>
Signed-off-by: Can Guo <quic_cang@...cinc.com>

--Nitin

> ---
>   drivers/ufs/host/ufs-qcom.c | 27 ++++++++++++++++++---------
>   drivers/ufs/host/ufs-qcom.h |  1 +
>   2 files changed, 19 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> index c3215d3..710f079 100644
> --- a/drivers/ufs/host/ufs-qcom.c
> +++ b/drivers/ufs/host/ufs-qcom.c
> @@ -443,7 +443,11 @@ static u32 ufs_qcom_get_hs_gear(struct ufs_hba *hba)
>   static int ufs_qcom_power_up_sequence(struct ufs_hba *hba)
>   {
>   	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> +	struct ufs_dev_params *host_pwr_cap = &host->host_pwr_cap;
>   	struct phy *phy = host->generic_phy;
> +	enum phy_mode mode = host_pwr_cap->hs_rate == PA_HS_MODE_B ?
> +							PHY_MODE_UFS_HS_B :
> +							PHY_MODE_UFS_HS_A;
>   	int ret;
>   
>   	/* Reset UFS Host Controller and PHY */
> @@ -460,7 +464,7 @@ static int ufs_qcom_power_up_sequence(struct ufs_hba *hba)
>   		return ret;
>   	}
>   
> -	phy_set_mode_ext(phy, PHY_MODE_UFS_HS_B, host->phy_gear);
> +	phy_set_mode_ext(phy, mode, host->phy_gear);
>   
>   	/* power on phy - start serdes and phy's power and clocks */
>   	ret = phy_power_on(phy);
> @@ -884,7 +888,6 @@ static int ufs_qcom_pwr_change_notify(struct ufs_hba *hba,
>   				struct ufs_pa_layer_attr *dev_req_params)
>   {
>   	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> -	struct ufs_dev_params ufs_qcom_cap;
>   	int ret = 0;
>   
>   	if (!dev_req_params) {
> @@ -894,13 +897,7 @@ static int ufs_qcom_pwr_change_notify(struct ufs_hba *hba,
>   
>   	switch (status) {
>   	case PRE_CHANGE:
> -		ufshcd_init_pwr_dev_param(&ufs_qcom_cap);
> -		ufs_qcom_cap.hs_rate = UFS_QCOM_LIMIT_HS_RATE;
> -
> -		/* This driver only supports symmetic gear setting i.e., hs_tx_gear == hs_rx_gear */
> -		ufs_qcom_cap.hs_tx_gear = ufs_qcom_cap.hs_rx_gear = ufs_qcom_get_hs_gear(hba);
> -
> -		ret = ufshcd_get_pwr_dev_param(&ufs_qcom_cap,
> +		ret = ufshcd_get_pwr_dev_param(&host->host_pwr_cap,
>   					       dev_max_params,
>   					       dev_req_params);
>   		if (ret) {
> @@ -1037,6 +1034,17 @@ static void ufs_qcom_advertise_quirks(struct ufs_hba *hba)
>   		hba->quirks |= UFSHCD_QUIRK_REINIT_AFTER_MAX_GEAR_SWITCH;
>   }
>   
> +static void ufs_qcom_set_pwr_mode_limits(struct ufs_hba *hba)
> +{
> +	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> +	struct ufs_dev_params *host_pwr_cap = &host->host_pwr_cap;
> +
> +	ufshcd_init_pwr_dev_param(host_pwr_cap);
> +
> +	/* This driver only supports symmetic gear setting i.e., hs_tx_gear == hs_rx_gear */
> +	host_pwr_cap->hs_tx_gear = host_pwr_cap->hs_rx_gear = ufs_qcom_get_hs_gear(hba);
> +}
> +
>   static void ufs_qcom_set_caps(struct ufs_hba *hba)
>   {
>   	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> @@ -1259,6 +1267,7 @@ static int ufs_qcom_init(struct ufs_hba *hba)
>   	if (err)
>   		goto out_variant_clear;
>   
> +	ufs_qcom_set_pwr_mode_limits(hba);
>   	ufs_qcom_set_caps(hba);
>   	ufs_qcom_advertise_quirks(hba);
>   
> diff --git a/drivers/ufs/host/ufs-qcom.h b/drivers/ufs/host/ufs-qcom.h
> index fa54248..4db64d9 100644
> --- a/drivers/ufs/host/ufs-qcom.h
> +++ b/drivers/ufs/host/ufs-qcom.h
> @@ -227,6 +227,7 @@ struct ufs_qcom_host {
>   
>   	struct gpio_desc *device_reset;
>   
> +	struct ufs_dev_params host_pwr_cap;
>   	u32 phy_gear;
>   
>   	bool esi_enabled;