From: Can Guo <cang@codeaurora.org>
To: Ziqi Chen <ziqichen@codeaurora.org>
Cc: asutoshd@codeaurora.org, nguyenb@codeaurora.org,
hongwus@codeaurora.org, rnayak@codeaurora.org,
vinholikatti@gmail.com, jejb@linux.vnet.ibm.com,
martin.petersen@oracle.com, linux-scsi@vger.kernel.org,
kernel-team@android.com, saravanak@google.com,
salyzyn@google.com, kwmad.kim@samsung.com,
stanley.chu@mediatek.com, Andy Gross <agross@kernel.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Alim Akhtar <alim.akhtar@samsung.com>,
Avri Altman <avri.altman@wdc.com>,
"James E.J. Bottomley" <jejb@linux.ibm.com>,
linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 2/2] scsi: ufs-qcom: Fix ufs RST_n specs violation
Date: Fri, 08 Jan 2021 16:05:58 +0800 [thread overview]
Message-ID: <d7e6a5ed6da3b18be7440e7590f6ef14@codeaurora.org> (raw)
In-Reply-To: <1610090885-50099-3-git-send-email-ziqichen@codeaurora.org>
On 2021-01-08 15:28, Ziqi Chen wrote:
> As per specs, e.g, JESD220E chapter 7.2, while powering
> off/on the ufs device, RST_n signal should be between
> VSS(Ground) and VCCQ/VCCQ2.
>
> Signed-off-by: Ziqi Chen <ziqichen@codeaurora.org>
> ---
> drivers/scsi/ufs/ufs-qcom.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
> index 2206b1e..d8b896c 100644
> --- a/drivers/scsi/ufs/ufs-qcom.c
> +++ b/drivers/scsi/ufs/ufs-qcom.c
> @@ -582,6 +582,10 @@ static int ufs_qcom_suspend(struct ufs_hba *hba,
> enum ufs_pm_op pm_op)
> ufs_qcom_disable_lane_clks(host);
> phy_power_off(phy);
>
> + /* reset the connected UFS device during power down */
> + if (host->device_reset)
> + gpiod_set_value_cansleep(host->device_reset, 1);
> +
Instead of calling gpiod_set_value(1/0) directly,
can we have a wrapper func for it?
Thanks,
Can Guo.
> } else if (!ufs_qcom_is_link_active(hba)) {
> ufs_qcom_disable_lane_clks(host);
> }
next prev parent reply other threads:[~2021-01-08 8:07 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1610090885-50099-1-git-send-email-ziqichen@codeaurora.org>
2021-01-08 7:28 ` [PATCH v5 1/2] scsi: ufs: Fix ufs clk specs violation Ziqi Chen
2021-01-08 8:23 ` Can Guo
2021-01-08 7:28 ` [PATCH v5 2/2] scsi: ufs-qcom: Fix ufs RST_n " Ziqi Chen
2021-01-08 8:05 ` Can Guo [this message]
2021-01-08 8:15 ` ziqichen
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