From: Kishon Vijay Abraham I <kishon@ti.com>
Date: Tue, 30 Mar 2021 11:01:38 +0000 (+0530)
Subject: phy: cadence-torrent: Add delay for PIPE clock to be stable
X-Git-Tag: io_uring-5.13-2021-05-07~90^2~33^2~15
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=b20da3c6b9dd0787e3eec996de806829e1bcaad1;p=linux-2.6-block.git

phy: cadence-torrent: Add delay for PIPE clock to be stable

The Torrent spec specifies delay of 660.5us after phy_reset is
asserted by the controller. To be on the safe side provide a delay
of 5ms to 10ms in ->phy_on() callback where the SERDES is already
configured in bootloader.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Link: https://lore.kernel.org/r/20210330110138.24356-6-kishon@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
---

diff --git a/drivers/phy/cadence/phy-cadence-torrent.c b/drivers/phy/cadence/phy-cadence-torrent.c
index ff8bb4b724c0..0477e7beebbf 100644
--- a/drivers/phy/cadence/phy-cadence-torrent.c
+++ b/drivers/phy/cadence/phy-cadence-torrent.c
@@ -371,7 +371,16 @@ static const struct phy_ops cdns_torrent_phy_ops = {
 	.owner		= THIS_MODULE,
 };
 
+static int cdns_torrent_noop_phy_on(struct phy *phy)
+{
+	/* Give 5ms to 10ms delay for the PIPE clock to be stable */
+	usleep_range(5000, 10000);
+
+	return 0;
+}
+
 static const struct phy_ops noop_ops = {
+	.power_on	= cdns_torrent_noop_phy_on,
 	.owner		= THIS_MODULE,
 };