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From:   Kishon Vijay Abraham I <kishon@ti.com>
To:     Kishon Vijay Abraham I <kishon@ti.com>,
        Vinod Koul <vkoul@kernel.org>,
        Philipp Zabel <p.zabel@pengutronix.de>
CC:     Swapnil Jakhade <sjakhade@cadence.com>,
        <linux-phy@lists.infradead.org>, <linux-kernel@vger.kernel.org>,
        Lokesh Vutla <lokeshvutla@ti.com>
Subject: [PATCH v2 5/5] phy: cadence-torrent: Add delay for PIPE clock to be stable
Date:   Tue, 30 Mar 2021 16:31:38 +0530
Message-ID: <20210330110138.24356-6-kishon@ti.com>
In-Reply-To: <20210330110138.24356-1-kishon@ti.com>
References: <20210330110138.24356-1-kishon@ti.com>
MIME-Version: 1.0
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Precedence: bulk

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>
---
 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