linux-kernel - Re: [PATCH v3 2/2] scsi: ufs-qcom: Keep core_clk

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Message-ID: <7ec66c17-2bb7-a472-6ebb-3151ba51df84@codeaurora.org>
Date:   Mon, 30 Nov 2020 18:36:42 -0800
From:   "Asutosh Das (asd)" <asutoshd@...eaurora.org>
To:     Can Guo <cang@...eaurora.org>, nguyenb@...eaurora.org,
        hongwus@...eaurora.org, ziqichen@...eaurora.org,
        rnayak@...eaurora.org, linux-scsi@...r.kernel.org,
        kernel-team@...roid.com, saravanak@...gle.com, salyzyn@...gle.com
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "open list:ARM/QUALCOMM SUPPORT" <linux-arm-msm@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/2] scsi: ufs-qcom: Keep core_clk_unipro ON while link
 is active

On 11/25/2020 6:01 PM, Can Guo wrote:
> If we want to disable clocks to save power but still keep the link active,
> core_clk_unipro, as same as ref_clk, should not be the one being disabled.
> 
> Reviewed-by: Hongwu Su<hongwus@...eaurora.org>
> Signed-off-by: Can Guo <cang@...eaurora.org>
> ---

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

>   drivers/scsi/ufs/ufs-qcom.c | 6 ++++++
>   1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
> index f9d6ef3..8a7fc62 100644
> --- a/drivers/scsi/ufs/ufs-qcom.c
> +++ b/drivers/scsi/ufs/ufs-qcom.c
> @@ -977,6 +977,7 @@ static int ufs_qcom_init(struct ufs_hba *hba)
>   	struct platform_device *pdev = to_platform_device(dev);
>   	struct ufs_qcom_host *host;
>   	struct resource *res;
> +	struct ufs_clk_info *clki;
>   
>   	if (strlen(android_boot_dev) && strcmp(android_boot_dev, dev_name(dev)))
>   		return -ENODEV;
> @@ -1075,6 +1076,11 @@ static int ufs_qcom_init(struct ufs_hba *hba)
>   		}
>   	}
>   
> +	list_for_each_entry(clki, &hba->clk_list_head, list) {
> +		if (!strcmp(clki->name, "core_clk_unipro"))
> +			clki->keep_link_active = true;
> +	}
> +
>   	err = ufs_qcom_init_lane_clks(host);
>   	if (err)
>   		goto out_variant_clear;
> 


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