linux-kernel - [PATCH v2 5/5] phy: cadence-torrent: Add delay for PIPE clock to be stable

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Date:   Tue, 30 Mar 2021 16:31:38 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>
CC:     Swapnil Jakhade <sjakhade@...ence.com>,
        <linux-phy@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        Lokesh Vutla <lokeshvutla@...com>
Subject: [PATCH v2 5/5] 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@...com>
---
 drivers/phy/cadence/phy-cadence-torrent.c | 9 +++++++++
 1 file changed, 9 insertions(+)

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,
 };
 
-- 
2.17.1