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Message-Id: <1580721472-10784-8-git-send-email-cang@codeaurora.org>
Date: Mon, 3 Feb 2020 01:17:49 -0800
From: Can Guo <cang@...eaurora.org>
To: asutoshd@...eaurora.org, nguyenb@...eaurora.org,
hongwus@...eaurora.org, rnayak@...eaurora.org,
linux-scsi@...r.kernel.org, kernel-team@...roid.com,
saravanak@...gle.com, salyzyn@...gle.com, cang@...eaurora.org
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>,
linux-arm-msm@...r.kernel.org (open list:ARM/QUALCOMM SUPPORT),
linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v5 7/8] scsi: ufs-qcom: Delay specific time before gate ref clk
After enter hibern8, as UFS JEDEC ver 3.0 requires, a specific gating wait
time is required before disable the device reference clock. If it is not
specified, use the old delay.
Signed-off-by: Can Guo <cang@...eaurora.org>
Reviewed-by: Asutosh Das <asutoshd@...eaurora.org>
---
drivers/scsi/ufs/ufs-qcom.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
index 85d7c17..3b5b2d9 100644
--- a/drivers/scsi/ufs/ufs-qcom.c
+++ b/drivers/scsi/ufs/ufs-qcom.c
@@ -833,6 +833,8 @@ static int ufs_qcom_bus_register(struct ufs_qcom_host *host)
static void ufs_qcom_dev_ref_clk_ctrl(struct ufs_qcom_host *host, bool enable)
{
+ unsigned long gating_wait;
+
if (host->dev_ref_clk_ctrl_mmio &&
(enable ^ host->is_dev_ref_clk_enabled)) {
u32 temp = readl_relaxed(host->dev_ref_clk_ctrl_mmio);
@@ -845,11 +847,16 @@ static void ufs_qcom_dev_ref_clk_ctrl(struct ufs_qcom_host *host, bool enable)
/*
* If we are here to disable this clock it might be immediately
* after entering into hibern8 in which case we need to make
- * sure that device ref_clk is active at least 1us after the
+ * sure that device ref_clk is active for specific time after
* hibern8 enter.
*/
- if (!enable)
- udelay(1);
+ if (!enable) {
+ gating_wait = host->hba->dev_info.clk_gating_wait_us;
+ if (!gating_wait)
+ udelay(1);
+ else
+ usleep_range(gating_wait, gating_wait + 10);
+ }
writel_relaxed(temp, host->dev_ref_clk_ctrl_mmio);
--
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