phy: qcom-qmp-pcie: fix initialisation reset

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>
Link: https://lore.kernel.org/r/20221105145939.20318-14-johan+linaro@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
index 8af84ff..0684455 100644 (file)
--- 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");