[PATCH 3/7] drm/exynos/hdmi: remove private lock code

[Andrzej Hajda]

Most of the code is called by drm core framework, so it is already synchronized.
The only async function is irq routine which only calls drm framework so it
does not need to be synchronized.

Signed-off-by: Andrzej Hajda <a.hajda at samsung.com>
---
 drivers/gpu/drm/exynos/exynos_hdmi.c | 27 +++------------------------
 1 file changed, 3 insertions(+), 24 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c 
b/drivers/gpu/drm/exynos/exynos_hdmi.c
index 1d07bdf..f2e909d 100644
--- a/drivers/gpu/drm/exynos/exynos_hdmi.c
+++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
@@ -22,7 +22,6 @@
 #include "regs-hdmi.h"

 #include <linux/kernel.h>
-#include <linux/spinlock.h>
 #include <linux/wait.h>
 #include <linux/i2c.h>
 #include <linux/platform_device.h>
@@ -188,7 +187,6 @@ struct hdmi_context {
        struct drm_encoder              *encoder;
        bool                            powered;
        bool                            dvi_mode;
-       struct mutex                    hdmi_mutex;

        void __iomem                    *regs;
        int                             irq;
@@ -1774,10 +1772,8 @@ static void hdmi_conf_apply(struct hdmi_context *hdata)
        hdmiphy_conf_reset(hdata);
        hdmiphy_conf_apply(hdata);

-       mutex_lock(&hdata->hdmi_mutex);
        hdmi_start(hdata, false);
        hdmi_conf_init(hdata);
-       mutex_unlock(&hdata->hdmi_mutex);

        hdmi_audio_init(hdata);

@@ -2029,12 +2025,8 @@ static void hdmi_commit(struct exynos_drm_display 
*display)
 {
        struct hdmi_context *hdata = display_to_hdmi(display);

-       mutex_lock(&hdata->hdmi_mutex);
-       if (!hdata->powered) {
-               mutex_unlock(&hdata->hdmi_mutex);
+       if (!hdata->powered)
                return;
-       }
-       mutex_unlock(&hdata->hdmi_mutex);

        hdmi_conf_apply(hdata);
 }
@@ -2043,16 +2035,11 @@ static void hdmi_poweron(struct hdmi_context *hdata)
 {
        struct hdmi_resources *res = &hdata->res;

-       mutex_lock(&hdata->hdmi_mutex);
-       if (hdata->powered) {
-               mutex_unlock(&hdata->hdmi_mutex);
+       if (hdata->powered)
                return;
-       }

        hdata->powered = true;

-       mutex_unlock(&hdata->hdmi_mutex);
-
        pm_runtime_get_sync(hdata->dev);

        if (regulator_bulk_enable(res->regul_count, res->regul_bulk))
@@ -2073,10 +2060,8 @@ static void hdmi_poweroff(struct hdmi_context *hdata)
 {
        struct hdmi_resources *res = &hdata->res;

-       mutex_lock(&hdata->hdmi_mutex);
        if (!hdata->powered)
-               goto out;
-       mutex_unlock(&hdata->hdmi_mutex);
+               return;

        /* HDMI System Disable */
        hdmi_reg_writemask(hdata, HDMI_CON_0, 0, HDMI_EN);
@@ -2096,11 +2081,7 @@ static void hdmi_poweroff(struct hdmi_context *hdata)

        pm_runtime_put_sync(hdata->dev);

-       mutex_lock(&hdata->hdmi_mutex);
        hdata->powered = false;
-
-out:
-       mutex_unlock(&hdata->hdmi_mutex);
 }

 static void hdmi_dpms(struct exynos_drm_display *display, int mode)
@@ -2330,8 +2311,6 @@ static int hdmi_probe(struct platform_device *pdev)
        hdata->display.type = EXYNOS_DISPLAY_TYPE_HDMI;
        hdata->display.ops = &hdmi_display_ops;

-       mutex_init(&hdata->hdmi_mutex);
-
        platform_set_drvdata(pdev, hdata);

        match = of_match_node(hdmi_match_types, dev->of_node);
-- 
1.9.1