lkml.org 
[lkml]   [2022]   [Oct]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 12/15] phy: qcom-qmp-pcie: fix initialisation reset
Date
Add the missing delay after asserting reset. This is specifically needed
for the reset to have any effect on SC8280XP.

The vendor driver uses a 1 ms delay, but that seems a bit excessive.
Instead use a 200 us delay which appears to be more than enough and also
matches the UFS reset delay added by commit 870b1279c7a0 ("scsi:
ufs-qcom: Add reset control support for host controller").

Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
---
drivers/phy/qualcomm/phy-qcom-qmp-pcie.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
index 2f4bdef73395..9c8e009033f1 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
@@ -1866,6 +1866,8 @@ static int qmp_pcie_init(struct phy *phy)
goto err_disable_regulators;
}

+ usleep_range(200, 300);
+
ret = reset_control_bulk_deassert(cfg->num_resets, qmp->resets);
if (ret) {
dev_err(qmp->dev, "reset deassert failed\n");
--
2.37.3
\
 
 \ /
  Last update: 2022-10-17 17:03    [W:0.231 / U:0.056 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site