linux-kernel - Re: [PATCH V2 2/2] scsi: ufs: ufs-qcom: check host controller state

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Message-ID: <20230802041019.GC2370@thinkpad>
Date:   Wed, 2 Aug 2023 09:40:19 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Nitin Rawat <quic_nitirawa@...cinc.com>
Cc:     powen.kao@...iatek.com, bvanassche@....org,
        alim.akhtar@...sung.com, adrian.hunter@...el.com,
        jejb@...ux.ibm.com, stanley.chu@...iatek.com,
        asutoshd@...eaurora.org, quic_cang@...cinc.com,
        martin.petersen@...cle.com, beanhuo@...ron.com,
        ebiggers@...gle.com, agross@...nel.org, Arthur.Simchaev@....com,
        konrad.dybcio@...aro.org, quic_ziqichen@...cinc.com,
        quic_nguyenb@...cinc.com, quic_narepall@...cinc.com,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Manish Pandey <quic_mapa@...cinc.com>
Subject: Re: [PATCH V2 2/2] scsi: ufs: ufs-qcom: check host controller state

On Wed, Jul 26, 2023 at 07:11:40PM +0530, Nitin Rawat wrote:
> Commit <52a518019ca1> (Fix missing clk change notification) added UFS
> clock scaling notification to ufshcd_host_reset_and_restore. This
> invokes hibern8 enter and exit on qualcomm platform which fails because
> controller is in reset state.
> 
> Fix this by checking the Host controller state before sending
> hibern8 command.
> 
> __ufshcd_wl_resume()
> ufshcd_reset_and_restore()
> ufshcd_host_reset_and_restore()
> ufshcd_scale_clks()
> ufshcd_vops_clk_scale_notify()
> ufs_qcom_clk_scale_notify()
> ufshcd_uic_hibern8_enter()
> 
> Fixes: 52a518019ca1 ("scsi: ufs: core: Fix missing clk change notification on host reset")
> 

Nit: No need of a newline here.

> Co-developed-by: Manish Pandey <quic_mapa@...cinc.com>
> Signed-off-by: Manish Pandey <quic_mapa@...cinc.com>
> Signed-off-by: Nitin Rawat <quic_nitirawa@...cinc.com>

Acked-by: Manivannan Sadhasivam <mani@...nel.org>

- Mani

> ---
>  drivers/ufs/host/ufs-qcom.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> index 8d6fd4c3324f..95412e98a598 100644
> --- a/drivers/ufs/host/ufs-qcom.c
> +++ b/drivers/ufs/host/ufs-qcom.c
> @@ -1254,6 +1254,10 @@ static int ufs_qcom_clk_scale_notify(struct ufs_hba *hba,
>  	struct ufs_pa_layer_attr *dev_req_params = &host->dev_req_params;
>  	int err = 0;
> 
> +	/* check the host controller state before sending hibern8 cmd */
> +	if (!ufshcd_is_hba_active(hba))
> +		return 0;
> +
>  	if (status == PRE_CHANGE) {
>  		err = ufshcd_uic_hibern8_enter(hba);
>  		if (err)
> --
> 2.17.1
> 

-- 
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