OMAPDSS: HDMI: Replace spinlock with mutex in hdmi_check_hpd_state

State change of HDMI PHY could potentially take many millisecs, we can do
better by protecting things in hdmi_set_phy_pwr() with a mutex rather than
a spin_lock_irqsave.
Signed-off-by: NJassi Brar <jaswinder.singh@linaro.org>
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/omap2/dss/hdmi.c

@@ -758,6 +758,7 @@ static int __init omapdss_hdmihw_probe(struct platform_device *pdev)
 	hdmi.ip_data.core_av_offset = HDMI_CORE_AV;
 	hdmi.ip_data.pll_offset = HDMI_PLLCTRL;
 	hdmi.ip_data.phy_offset = HDMI_PHY;
+	mutex_init(&hdmi.ip_data.lock);
 
 	hdmi_panel_init();
 

drivers/video/omap2/dss/ti_hdmi.h

@@ -177,6 +177,7 @@ struct hdmi_ip_data {
 
 	/* ti_hdmi_4xxx_ip private data. These should be in a separate struct */
 	int hpd_gpio;
+	struct mutex lock;
 };
 int ti_hdmi_4xxx_phy_enable(struct hdmi_ip_data *ip_data);
 void ti_hdmi_4xxx_phy_disable(struct hdmi_ip_data *ip_data);

drivers/video/omap2/dss/ti_hdmi_4xxx_ip.c

@@ -235,13 +235,10 @@ void ti_hdmi_4xxx_pll_disable(struct hdmi_ip_data *ip_data)
 
 static int hdmi_check_hpd_state(struct hdmi_ip_data *ip_data)
 {
-	unsigned long flags;
 	bool hpd;
 	int r;
-	/* this should be in ti_hdmi_4xxx_ip private data */
-	static DEFINE_SPINLOCK(phy_tx_lock);
 
-	spin_lock_irqsave(&phy_tx_lock, flags);
+	mutex_lock(&ip_data->lock);
 
 	hpd = gpio_get_value(ip_data->hpd_gpio);
 
@@ -257,7 +254,7 @@ static int hdmi_check_hpd_state(struct hdmi_ip_data *ip_data)
 	}
 
 err:
-	spin_unlock_irqrestore(&phy_tx_lock, flags);
+	mutex_unlock(&ip_data->lock);
 	return r;
 }