Mixed need to have hdmi clock enabled to properly perform power on/off
sequences, so add handling of this clock directly to the mixer driver.
Dependency between hdmi clock and mixer module has been observed on
Exynos4 based boards.
Suggested-by: Andrzej Hajda <a.hajda at samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski at samsung.com>
---
Documentation/devicetree/bindings/video/exynos_mixer.txt | 1 +
drivers/gpu/drm/exynos/exynos_mixer.c | 9 +++++++++
2 files changed, 10 insertions(+)
diff --git a/Documentation/devicetree/bindings/video/exynos_mixer.txt
b/Documentation/devicetree/bindings/video/exynos_mixer.txt
index 08b394b..3e38128 100644
--- a/Documentation/devicetree/bindings/video/exynos_mixer.txt
+++ b/Documentation/devicetree/bindings/video/exynos_mixer.txt
@@ -15,6 +15,7 @@ Required properties:
a) mixer: Gate of Mixer IP bus clock.
b) sclk_hdmi: HDMI Special clock, one of the two possible inputs of
mixer mux.
+ c) hdmi: Gate of HDMI IP bus clock, needed together with sclk_hdmi.
Example:
diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c
b/drivers/gpu/drm/exynos/exynos_mixer.c
index 820b762..e5ef1fc 100644
--- a/drivers/gpu/drm/exynos/exynos_mixer.c
+++ b/drivers/gpu/drm/exynos/exynos_mixer.c
@@ -72,6 +72,7 @@ struct mixer_resources {
spinlock_t reg_slock;
struct clk *mixer;
struct clk *vp;
+ struct clk *hdmi;
struct clk *sclk_mixer;
struct clk *sclk_hdmi;
struct clk *mout_mixer;
@@ -774,6 +775,12 @@ static int mixer_resources_init(struct mixer_context
*mixer_ctx)
return -ENODEV;
}
+ mixer_res->hdmi = devm_clk_get(dev, "hdmi");
+ if (IS_ERR(mixer_res->hdmi)) {
+ dev_err(dev, "failed to get clock 'hdmi'\n");
+ return -ENODEV;
+ }
+
mixer_res->sclk_hdmi = devm_clk_get(dev, "sclk_hdmi");
if (IS_ERR(mixer_res->sclk_hdmi)) {
dev_err(dev, "failed to get clock 'sclk_hdmi'\n");
@@ -1095,6 +1102,7 @@ static void mixer_poweron(struct exynos_drm_manager *mgr)
pm_runtime_get_sync(ctx->dev);
clk_prepare_enable(res->mixer);
+ clk_prepare_enable(res->hdmi);
if (ctx->vp_enabled) {
clk_prepare_enable(res->vp);
if (ctx->has_sclk)
@@ -1134,6 +1142,7 @@ static void mixer_poweroff(struct exynos_drm_manager *mgr)
ctx->powered = false;
mutex_unlock(&ctx->mixer_mutex);
+ clk_disable_unprepare(res->hdmi);
clk_disable_unprepare(res->mixer);
if (ctx->vp_enabled) {
clk_disable_unprepare(res->vp);
--
1.9.2
