linux-kernel - [PATCH AUTOSEL 4.18 087/136] drm/sun4i: Enable DW HDMI PHY clock

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Message-ID: <20180917030006.245495-87-alexander.levin@microsoft.com>
Date:   Mon, 17 Sep 2018 03:01:06 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Jernej Skrabec <jernej.skrabec@...l.net>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.18 087/136] drm/sun4i: Enable DW HDMI PHY clock

From: Jernej Skrabec <jernej.skrabec@...l.net>

[ Upstream commit 09773c532d30187f86a142901c27c93e629ce6ba ]

Current DW HDMI PHY code never prepares and enables PHY clock after it is
created. It's just used as it is. This may work in some cases, but it's
clearly wrong. Fix it by adding proper calls to enable/disable PHY
clock.

Fixes: 4f86e81748fe ("drm/sun4i: Add support for H3 HDMI PHY variant")

Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
Signed-off-by: Maxime Ripard <maxime.ripard@...tlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180625120304.7543-17-jernej.skrabec@siol.net
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
index 5a52fc489a9d..966688f04741 100644
--- a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
+++ b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
@@ -477,13 +477,15 @@ int sun8i_hdmi_phy_probe(struct sun8i_dw_hdmi *hdmi, struct device_node *node)
 			dev_err(dev, "Couldn't create the PHY clock\n");
 			goto err_put_clk_pll0;
 		}
+
+		clk_prepare_enable(phy->clk_phy);
 	}
 
 	phy->rst_phy = of_reset_control_get_shared(node, "phy");
 	if (IS_ERR(phy->rst_phy)) {
 		dev_err(dev, "Could not get phy reset control\n");
 		ret = PTR_ERR(phy->rst_phy);
-		goto err_put_clk_pll0;
+		goto err_disable_clk_phy;
 	}
 
 	ret = reset_control_deassert(phy->rst_phy);
@@ -514,6 +516,8 @@ int sun8i_hdmi_phy_probe(struct sun8i_dw_hdmi *hdmi, struct device_node *node)
 	reset_control_assert(phy->rst_phy);
 err_put_rst_phy:
 	reset_control_put(phy->rst_phy);
+err_disable_clk_phy:
+	clk_disable_unprepare(phy->clk_phy);
 err_put_clk_pll0:
 	if (phy->variant->has_phy_clk)
 		clk_put(phy->clk_pll0);
@@ -531,6 +535,7 @@ void sun8i_hdmi_phy_remove(struct sun8i_dw_hdmi *hdmi)
 
 	clk_disable_unprepare(phy->clk_mod);
 	clk_disable_unprepare(phy->clk_bus);
+	clk_disable_unprepare(phy->clk_phy);
 
 	reset_control_assert(phy->rst_phy);
 
-- 
2.17.1