diff mbox series

[v5,13/16] phy: qcom-qmp-pcie: fix initialisation reset

Message ID 20221105145939.20318-14-johan+linaro@kernel.org
State Accepted
Commit fffdeaf853d8088c5149fc776974344b0f815dc8
Headers show
Series phy: qcom-qmp-pcie: add support for sc8280xp | expand

Commit Message

Johan Hovold Nov. 5, 2022, 2:59 p.m. UTC 
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").

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

Patch

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
index 8af84ff755ab..06844552922e 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");