[PATCH] drm/exynos: add check for the device power status

[Shirish S]

V2: Add mutex protection, while read.

The hdmi and mixer win_commit calls currently are
not checking the status of IP before updating the
respective registers, this patch adds this check.

Signed-off-by: Shirish S <s.shirish at samsung.com>
---
 drivers/gpu/drm/exynos/exynos_hdmi.c  | 7 +++++++
 drivers/gpu/drm/exynos/exynos_mixer.c | 7 +++++++
 2 files changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c 
b/drivers/gpu/drm/exynos/exynos_hdmi.c
index 2c46b6c..05335ae 100644
--- a/drivers/gpu/drm/exynos/exynos_hdmi.c
+++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
@@ -2170,6 +2170,13 @@ static void hdmi_commit(void *ctx)

        DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);

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

diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c 
b/drivers/gpu/drm/exynos/exynos_mixer.c
index 21db895..9fba6bd 100644
--- a/drivers/gpu/drm/exynos/exynos_mixer.c
+++ b/drivers/gpu/drm/exynos/exynos_mixer.c
@@ -775,6 +775,13 @@ static void mixer_win_commit(void *ctx, int win)

        DRM_DEBUG_KMS("[%d] %s, win: %d\n", __LINE__, __func__, win);

+       mutex_lock(&mixer_ctx->mixer_mutex);
+       if (!mixer_ctx->powered) {
+               mutex_unlock(&mixer_ctx->mixer_mutex);
+               return;
+       }
+       mutex_unlock(&mixer_ctx->mixer_mutex);
+
        if (win > 1 && mixer_ctx->vp_enabled)
                vp_video_buffer(mixer_ctx, win);
        else
-- 
1.8.0