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drm/exynos: add support for 'hdmi' clock 

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@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
This commit is contained in:
Marek Szyprowski 2015-02-02 14:20:28 +01:00 committed by Inki Dae
parent 2f8997902e
commit 04427ec574
2 changed files with 10 additions and 0 deletions
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1
Documentation/devicetree/bindings/video/exynos_mixer.txt
View File

@ -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:

9
drivers/gpu/drm/exynos/exynos_mixer.c
View File

@ -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;
@ -769,6 +770,12 @@ 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 PTR_ERR(mixer_res->hdmi);
}
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");
@ -1092,6 +1099,7 @@ static void mixer_poweron(struct exynos_drm_crtc *crtc)
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)
@ -1131,6 +1139,7 @@ static void mixer_poweroff(struct exynos_drm_crtc *crtc)
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);