linux-kernel - [PATCH 05/15] phy/rockchip: inno-hdmi: force set_rate on power

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Date:   Mon, 6 Jan 2020 20:48:24 +0000
From:   Jonas Karlman <jonas@...boo.se>
To:     Heiko Stuebner <heiko@...ech.de>, Sandy Huang <hjc@...k-chips.com>
CC:     Huicong Xu <xhc@...k-chips.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Zheng Yang <zhengyang@...k-chips.com>,
        "linux-rockchip@...ts.infradead.org" 
        <linux-rockchip@...ts.infradead.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jonas Karlman <jonas@...boo.se>
Subject: [PATCH 05/15] phy/rockchip: inno-hdmi: force set_rate on power_on

From: Huicong Xu <xhc@...k-chips.com>

Regular 8-bit and Deep Color video formats mainly differ in TMDS rate and
not in pixel clock rate.
When the hdmiphy clock is configured with the same pixel clock rate using
clk_set_rate() the clock framework do not signal the hdmi phy driver
to set_rate when switching between 8-bit and Deep Color.
This result in pre/post pll not being re-configured when switching between
regular 8-bit and Deep Color video formats.

Fix this by calling set_rate in power_on to force pre pll re-configuration.

Signed-off-by: Huicong Xu <xhc@...k-chips.com>
Signed-off-by: Jonas Karlman <jonas@...boo.se>
---
 drivers/phy/rockchip/phy-rockchip-inno-hdmi.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/phy/rockchip/phy-rockchip-inno-hdmi.c b/drivers/phy/rockchip/phy-rockchip-inno-hdmi.c
index 3a59a6da0440..3719309ad0d0 100644
--- a/drivers/phy/rockchip/phy-rockchip-inno-hdmi.c
+++ b/drivers/phy/rockchip/phy-rockchip-inno-hdmi.c
@@ -245,6 +245,7 @@ struct inno_hdmi_phy {
 	struct clk_hw hw;
 	struct clk *phyclk;
 	unsigned long pixclock;
+	unsigned long tmdsclock;
 };
 
 struct pre_pll_config {
@@ -485,6 +486,8 @@ static int inno_hdmi_phy_power_on(struct phy *phy)
 
 	dev_dbg(inno->dev, "Inno HDMI PHY Power On\n");
 
+	inno->plat_data->clk_ops->set_rate(&inno->hw, inno->pixclock, 24000000);
+
 	ret = clk_prepare_enable(inno->phyclk);
 	if (ret)
 		return ret;
@@ -509,6 +512,8 @@ static int inno_hdmi_phy_power_off(struct phy *phy)
 
 	clk_disable_unprepare(inno->phyclk);
 
+	inno->tmdsclock = 0;
+
 	dev_dbg(inno->dev, "Inno HDMI PHY Power Off\n");
 
 	return 0;
@@ -628,6 +633,9 @@ static int inno_hdmi_phy_rk3228_clk_set_rate(struct clk_hw *hw,
 	dev_dbg(inno->dev, "%s rate %lu tmdsclk %lu\n",
 		__func__, rate, tmdsclock);
 
+	if (inno->pixclock == rate && inno->tmdsclock == tmdsclock)
+		return 0;
+
 	cfg = inno_hdmi_phy_get_pre_pll_cfg(inno, rate);
 	if (IS_ERR(cfg))
 		return PTR_ERR(cfg);
@@ -670,6 +678,7 @@ static int inno_hdmi_phy_rk3228_clk_set_rate(struct clk_hw *hw,
 	}
 
 	inno->pixclock = rate;
+	inno->tmdsclock = tmdsclock;
 
 	return 0;
 }
@@ -781,6 +790,9 @@ static int inno_hdmi_phy_rk3328_clk_set_rate(struct clk_hw *hw,
 	dev_dbg(inno->dev, "%s rate %lu tmdsclk %lu\n",
 		__func__, rate, tmdsclock);
 
+	if (inno->pixclock == rate && inno->tmdsclock == tmdsclock)
+		return 0;
+
 	cfg = inno_hdmi_phy_get_pre_pll_cfg(inno, rate);
 	if (IS_ERR(cfg))
 		return PTR_ERR(cfg);
@@ -820,6 +832,7 @@ static int inno_hdmi_phy_rk3328_clk_set_rate(struct clk_hw *hw,
 	}
 
 	inno->pixclock = rate;
+	inno->tmdsclock = tmdsclock;
 
 	return 0;
 }
-- 
2.17.1