linux-kernel - [PATCH] drm: sun4i: exclusively set HDMI-related clocks for dw-hdmi

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Message-Id: <20180815120745.36593-1-icenowy@aosc.io>
Date:   Wed, 15 Aug 2018 20:07:45 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     Maxime Ripard <maxime.ripard@...tlin.com>,
        David Airlie <airlied@...ux.ie>, Chen-Yu Tsai <wens@...e.org>
Cc:     dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com, Icenowy Zheng <icenowy@...c.io>,
        stable@...r.kernel.org
Subject: [PATCH] drm: sun4i: exclusively set HDMI-related clocks for dw-hdmi

The glue in sun4i-drm of dw-hdmi currently doesn't set the clocks of
dw-hdmi exclusively, which will lead the display fails to initialize in
some situations.

Add the exclusivity to sun8i-dw-hdmi and sun8i-hdmi-phy.

Cc: stable@...r.kernel.org # v4.17+
Signed-off-by: Icenowy Zheng <icenowy@...c.io>
---
 drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c  | 11 ++++++++++-
 drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c |  7 +++++--
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
index 31875b636434..a10220518548 100644
--- a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
+++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c
@@ -137,10 +137,16 @@ static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master,
 		goto err_assert_ctrl_reset;
 	}
 
+	ret = clk_rate_exclusive_get(hdmi->clk_tmds);
+	if (ret) {
+		dev_err(dev, "Could not get exclusivity over the tmds clock\n");
+		goto err_disable_clk_tmds;
+	}
+
 	phy_node = of_parse_phandle(dev->of_node, "phys", 0);
 	if (!phy_node) {
 		dev_err(dev, "Can't found PHY phandle\n");
-		goto err_disable_clk_tmds;
+		goto err_put_clk_tmds_exclusivity;
 	}
 
 	ret = sun8i_hdmi_phy_probe(hdmi, phy_node);
@@ -179,6 +185,8 @@ static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master,
 cleanup_encoder:
 	drm_encoder_cleanup(encoder);
 	sun8i_hdmi_phy_remove(hdmi);
+err_put_clk_tmds_exclusivity:
+	clk_rate_exclusive_put(hdmi->clk_tmds);
 err_disable_clk_tmds:
 	clk_disable_unprepare(hdmi->clk_tmds);
 err_assert_ctrl_reset:
@@ -194,6 +202,7 @@ static void sun8i_dw_hdmi_unbind(struct device *dev, struct device *master,
 
 	dw_hdmi_unbind(hdmi->hdmi);
 	sun8i_hdmi_phy_remove(hdmi);
+	clk_rate_exclusive_put(hdmi->clk_tmds);
 	clk_disable_unprepare(hdmi->clk_tmds);
 	reset_control_assert(hdmi->rst_ctrl);
 }
diff --git a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
index 82502b351aec..1e0b1d9bc0fb 100644
--- a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
+++ b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c
@@ -511,13 +511,14 @@ int sun8i_hdmi_phy_probe(struct sun8i_dw_hdmi *hdmi, struct device_node *node)
 		}
 
 		clk_prepare_enable(phy->clk_phy);
+		clk_rate_exclusive_get(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_disable_clk_phy;
+		goto err_put_clk_phy_exclusivity;
 	}
 
 	ret = reset_control_deassert(phy->rst_phy);
@@ -548,7 +549,8 @@ 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:
+err_put_clk_phy_exclusivity:
+	clk_rate_exclusive_put(phy->clk_phy);
 	clk_disable_unprepare(phy->clk_phy);
 err_put_clk_pll1:
 	clk_put(phy->clk_pll1);
@@ -568,6 +570,7 @@ void sun8i_hdmi_phy_remove(struct sun8i_dw_hdmi *hdmi)
 
 	clk_disable_unprepare(phy->clk_mod);
 	clk_disable_unprepare(phy->clk_bus);
+	clk_rate_exclusive_put(phy->clk_phy);
 	clk_disable_unprepare(phy->clk_phy);
 
 	reset_control_assert(phy->rst_phy);
-- 
2.18.0