HDMI_EN regulator is additional regulator for providing voltage source
for DCC lines available on HDMI connector. When there is no power
provided for DDC epprom, some TV-sets do not pulls up HPD (hot plug
detect) line, what causes HDMI block to stay turned off. This patch
enables HDMI_EN regulator (if available) on driver probe and keep it
enabled all the time to let TV-set correctly signal HPD event.
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
---
drivers/gpu/drm/exynos/exynos_hdmi.c | 19 ++++++++++++++++++-
1 file changed, 18 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
index aa259b0a873a..a9a87d024c56 100644
--- a/drivers/gpu/drm/exynos/exynos_hdmi.c
+++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
@@ -84,6 +84,7 @@ struct hdmi_resources {
struct clk *sclk_hdmiphy;
struct clk *mout_hdmi;
struct regulator_bulk_data *regul_bulk;
+ struct regulator *reg_hdmi_en;
int regul_count;
};
@@ -2168,7 +2169,6 @@ static int hdmi_resources_init(struct hdmi_context *hdata)
struct device *dev = hdata->dev;
struct hdmi_resources *res = &hdata->res;
static char *supply[] = {
- "hdmi-en",
"vdd",
"vdd_osc",
"vdd_pll",
@@ -2228,6 +2228,20 @@ static int hdmi_resources_init(struct hdmi_context *hdata)
}
res->regul_count = ARRAY_SIZE(supply);
+ res->reg_hdmi_en = devm_regulator_get(dev, "hdmi-en");
+ if (IS_ERR(res->reg_hdmi_en) && PTR_ERR(res->reg_hdmi_en) != -ENOENT) {
+ DRM_ERROR("failed to get hdmi-en regulator\n");
+ return PTR_ERR(res->reg_hdmi_en);
+ }
+ if (!IS_ERR(res->reg_hdmi_en)) {
+ ret = regulator_enable(res->reg_hdmi_en);
+ if (ret) {
+ DRM_ERROR("failed to enable hdmi-en regulator\n");
+ return ret;
+ }
+ } else
+ res->reg_hdmi_en = NULL;
+
return ret;
fail:
DRM_ERROR("HDMI resource init - failed\n");
@@ -2494,6 +2508,9 @@ static int hdmi_remove(struct platform_device *pdev)
cancel_delayed_work_sync(&hdata->hotplug_work);
+ if (hdata->res.reg_hdmi_en)
+ regulator_disable(hdata->res.reg_hdmi_en);
+
put_device(&hdata->hdmiphy_port->dev);
put_device(&hdata->ddc_adpt->dev);
--
1.9.2
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