drm/msm/hdmi: enable lpm-mux if it is present

lpm-mux is programmed to enable HDMI connector
on the docking station for S805 chipset based
devices.
Signed-off-by: Beeresh Gopal <gbeeresh@codeaurora.org>
Signed-off-by: Stephane Viau <sviau@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/hdmi/hdmi.c

@@ -317,6 +317,7 @@ static int hdmi_bind(struct device *dev, struct device *master, void *data)
 	config.hpd_gpio      = get_gpio("qcom,hdmi-tx-hpd");
 	config.mux_en_gpio   = get_gpio("qcom,hdmi-tx-mux-en");
 	config.mux_sel_gpio  = get_gpio("qcom,hdmi-tx-mux-sel");
+	config.mux_lpm_gpio  = get_gpio("qcom,hdmi-tx-mux-lpm");
 
 #else
 	static const char *hpd_clk_names[] = {

drivers/gpu/drm/msm/hdmi/hdmi.h

@@ -96,6 +96,7 @@ struct hdmi_platform_config {
 
 	/* gpio's: */
 	int ddc_clk_gpio, ddc_data_gpio, hpd_gpio, mux_en_gpio, mux_sel_gpio;
+	int mux_lpm_gpio;
 
 	/* older devices had their own irq, mdp5+ it is shared w/ mdp: */
 	bool shared_irq;

drivers/gpu/drm/msm/hdmi/hdmi_connector.c

@@ -78,6 +78,19 @@ static int gpio_config(struct hdmi *hdmi, bool on)
 			}
 			gpio_set_value_cansleep(config->mux_sel_gpio, 0);
 		}
+
+		if (config->mux_lpm_gpio != -1) {
+			ret = gpio_request(config->mux_lpm_gpio,
+					"HDMI_MUX_LPM");
+			if (ret) {
+				dev_err(dev->dev,
+					"'%s'(%d) gpio_request failed: %d\n",
+					"HDMI_MUX_LPM",
+					config->mux_lpm_gpio, ret);
+				goto error6;
+			}
+			gpio_set_value_cansleep(config->mux_lpm_gpio, 1);
+		}
 		DBG("gpio on");
 	} else {
 		gpio_free(config->ddc_clk_gpio);
@@ -93,11 +106,19 @@ static int gpio_config(struct hdmi *hdmi, bool on)
 			gpio_set_value_cansleep(config->mux_sel_gpio, 1);
 			gpio_free(config->mux_sel_gpio);
 		}
+
+		if (config->mux_lpm_gpio != -1) {
+			gpio_set_value_cansleep(config->mux_lpm_gpio, 0);
+			gpio_free(config->mux_lpm_gpio);
+		}
 		DBG("gpio off");
 	}
 
 	return 0;
 
+error6:
+	if (config->mux_sel_gpio != -1)
+		gpio_free(config->mux_sel_gpio);
 error5:
 	if (config->mux_en_gpio != -1)
 		gpio_free(config->mux_en_gpio);