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drm/exynos: hdmi: make 'hdmi-en' regulator optional and keep it enabled

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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@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
This commit is contained in:
Marek Szyprowski 2014-07-01 10:10:06 +02:00 • committed by Inki Dae
parent 8f589bba25
commit 05fdf98742
1 changed files with 18 additions and 1 deletions
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19
drivers/gpu/drm/exynos/exynos_hdmi.c
View file

@ -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;
};
@ -2167,7 +2168,6 @@ 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",
@ -2227,6 +2227,20 @@ 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");
@ -2493,6 +2507,9 @@ 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);