drm/msm/hdmi: Clean up connector gpio usage

Make gpio allocation and usage iterative by parsing the gpios on a given
platform from a list. This gives us flexibility over what all gpios exist
for a platform, whether they are input or output, and what value they
should be set to.

In particular, this will make HDMI on 8x96 platforms easier to integrate
with the driver, as it doesn't have a HPD gpio input to them. Also, it
cleans things up a bit.

We still use the legacy gpio api here, as we might need to backport this
driver to downstream kernels.
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

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

@@ -388,7 +388,21 @@ static struct hdmi_platform_config hdmi_tx_8996_config = {
 		.hpd_freq      = hpd_clk_freq_8x74,
 };
 
-static int get_gpio(struct device *dev, struct device_node *of_node, const char *name)
+static const struct {
+	const char *name;
+	const bool output;
+	const int value;
+	const char *label;
+} hdmi_gpio_pdata[] = {
+	{ "qcom,hdmi-tx-ddc-clk", true, 1, "HDMI_DDC_CLK" },
+	{ "qcom,hdmi-tx-ddc-data", true, 1, "HDMI_DDC_DATA" },
+	{ "qcom,hdmi-tx-hpd", false, 1, "HDMI_HPD" },
+	{ "qcom,hdmi-tx-mux-en", true, 1, "HDMI_MUX_EN" },
+	{ "qcom,hdmi-tx-mux-sel", true, 0, "HDMI_MUX_SEL" },
+	{ "qcom,hdmi-tx-mux-lpm", true, 1, "HDMI_MUX_LPM" },
+};
+
+static int get_gpio(struct device_node *of_node, const char *name)
 {
 	int gpio = of_get_named_gpio(of_node, name, 0);
 	if (gpio < 0) {
@@ -410,6 +424,7 @@ static int hdmi_bind(struct device *dev, struct device *master, void *data)
 	static struct hdmi_platform_config *hdmi_cfg;
 	struct hdmi *hdmi;
 	struct device_node *of_node = dev->of_node;
+	int i;
 
 	hdmi_cfg = (struct hdmi_platform_config *)
 			of_device_get_match_data(dev);
@@ -420,12 +435,14 @@ static int hdmi_bind(struct device *dev, struct device *master, void *data)
 
 	hdmi_cfg->mmio_name     = "core_physical";
 	hdmi_cfg->qfprom_mmio_name = "qfprom_physical";
-	hdmi_cfg->ddc_clk_gpio  = get_gpio(dev, of_node, "qcom,hdmi-tx-ddc-clk");
-	hdmi_cfg->ddc_data_gpio = get_gpio(dev, of_node, "qcom,hdmi-tx-ddc-data");
-	hdmi_cfg->hpd_gpio      = get_gpio(dev, of_node, "qcom,hdmi-tx-hpd");
-	hdmi_cfg->mux_en_gpio   = get_gpio(dev, of_node, "qcom,hdmi-tx-mux-en");
-	hdmi_cfg->mux_sel_gpio  = get_gpio(dev, of_node, "qcom,hdmi-tx-mux-sel");
-	hdmi_cfg->mux_lpm_gpio  = get_gpio(dev, of_node, "qcom,hdmi-tx-mux-lpm");
+
+	for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) {
+		hdmi_cfg->gpios[i].num = get_gpio(of_node,
+						hdmi_gpio_pdata[i].name);
+		hdmi_cfg->gpios[i].output = hdmi_gpio_pdata[i].output;
+		hdmi_cfg->gpios[i].value = hdmi_gpio_pdata[i].value;
+		hdmi_cfg->gpios[i].label = hdmi_gpio_pdata[i].label;
+	}
 
 	dev->platform_data = hdmi_cfg;
 

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

@@ -27,10 +27,18 @@
 #include "msm_drv.h"
 #include "hdmi.xml.h"
 
+#define HDMI_MAX_NUM_GPIO	6
 
 struct hdmi_phy;
 struct hdmi_platform_config;
 
+struct hdmi_gpio_data {
+	int num;
+	bool output;
+	int value;
+	const char *label;
+};
+
 struct hdmi_audio {
 	bool enabled;
 	struct hdmi_audio_infoframe infoframe;
@@ -110,8 +118,7 @@ struct hdmi_platform_config {
 	int pwr_clk_cnt;
 
 	/* gpio's: */
-	int ddc_clk_gpio, ddc_data_gpio, hpd_gpio, mux_en_gpio, mux_sel_gpio;
-	int mux_lpm_gpio;
+	struct hdmi_gpio_data gpios[HDMI_MAX_NUM_GPIO];
 };
 
 void hdmi_set_mode(struct hdmi *hdmi, bool power_on);

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

@@ -81,114 +81,54 @@ static int gpio_config(struct hdmi *hdmi, bool on)
 {
 	struct device *dev = &hdmi->pdev->dev;
 	const struct hdmi_platform_config *config = hdmi->config;
-	int ret;
+	int ret, i;
 
 	if (on) {
-		if (config->ddc_clk_gpio != -1) {
-			ret = gpio_request(config->ddc_clk_gpio, "HDMI_DDC_CLK");
-			if (ret) {
-				dev_err(dev, "'%s'(%d) gpio_request failed: %d\n",
-					"HDMI_DDC_CLK", config->ddc_clk_gpio, ret);
-				goto error1;
-			}
-			gpio_set_value_cansleep(config->ddc_clk_gpio, 1);
-		}
-
-		if (config->ddc_data_gpio != -1) {
-			ret = gpio_request(config->ddc_data_gpio, "HDMI_DDC_DATA");
-			if (ret) {
-				dev_err(dev, "'%s'(%d) gpio_request failed: %d\n",
-					"HDMI_DDC_DATA", config->ddc_data_gpio, ret);
-				goto error2;
-			}
-			gpio_set_value_cansleep(config->ddc_data_gpio, 1);
-		}
+		for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) {
+			struct hdmi_gpio_data gpio = config->gpios[i];
 
-		ret = gpio_request(config->hpd_gpio, "HDMI_HPD");
+			if (gpio.num != -1) {
+				ret = gpio_request(gpio.num, gpio.label);
 				if (ret) {
-			dev_err(dev, "'%s'(%d) gpio_request failed: %d\n",
-				"HDMI_HPD", config->hpd_gpio, ret);
-			goto error3;
+					dev_err(dev,
+						"'%s'(%d) gpio_request failed: %d\n",
+						gpio.label, gpio.num, ret);
+					goto err;
 				}
-		gpio_direction_input(config->hpd_gpio);
-		gpio_set_value_cansleep(config->hpd_gpio, 1);
 
-		if (config->mux_en_gpio != -1) {
-			ret = gpio_request(config->mux_en_gpio, "HDMI_MUX_EN");
-			if (ret) {
-				dev_err(dev, "'%s'(%d) gpio_request failed: %d\n",
-					"HDMI_MUX_EN", config->mux_en_gpio, ret);
-				goto error4;
-			}
-			gpio_set_value_cansleep(config->mux_en_gpio, 1);
+				if (gpio.output) {
+					gpio_direction_output(gpio.num,
+							      gpio.value);
+				} else {
+					gpio_direction_input(gpio.num);
+					gpio_set_value_cansleep(gpio.num,
+								gpio.value);
 				}
-
-		if (config->mux_sel_gpio != -1) {
-			ret = gpio_request(config->mux_sel_gpio, "HDMI_MUX_SEL");
-			if (ret) {
-				dev_err(dev, "'%s'(%d) gpio_request failed: %d\n",
-					"HDMI_MUX_SEL", config->mux_sel_gpio, ret);
-				goto error5;
 			}
-			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,
-					"'%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 {
-		if (config->ddc_clk_gpio != -1)
-			gpio_free(config->ddc_clk_gpio);
-
-		if (config->ddc_data_gpio != -1)
-			gpio_free(config->ddc_data_gpio);
+		for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) {
+			struct hdmi_gpio_data gpio = config->gpios[i];
 
-		gpio_free(config->hpd_gpio);
+			if (gpio.output) {
+				int value = gpio.value ? 0 : 1;
 
-		if (config->mux_en_gpio != -1) {
-			gpio_set_value_cansleep(config->mux_en_gpio, 0);
-			gpio_free(config->mux_en_gpio);
+				gpio_set_value_cansleep(gpio.num, value);
 			}
 
-		if (config->mux_sel_gpio != -1) {
-			gpio_set_value_cansleep(config->mux_sel_gpio, 1);
-			gpio_free(config->mux_sel_gpio);
-		}
+			gpio_free(gpio.num);
+		};
 
-		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;
+err:
+	while (i--)
+		gpio_free(config->gpios[i].num);
 
-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);
-error4:
-	gpio_free(config->hpd_gpio);
-error3:
-	if (config->ddc_data_gpio != -1)
-		gpio_free(config->ddc_data_gpio);
-error2:
-	if (config->ddc_clk_gpio != -1)
-		gpio_free(config->ddc_clk_gpio);
-error1:
 	return ret;
 }
 
@@ -345,10 +285,13 @@ static enum drm_connector_status detect_reg(struct hdmi *hdmi)
 			connector_status_connected : connector_status_disconnected;
 }
 
+#define HPD_GPIO_INDEX	2
 static enum drm_connector_status detect_gpio(struct hdmi *hdmi)
 {
 	const struct hdmi_platform_config *config = hdmi->config;
-	return gpio_get_value(config->hpd_gpio) ?
+	struct hdmi_gpio_data hpd_gpio = config->gpios[HPD_GPIO_INDEX];
+
+	return gpio_get_value(hpd_gpio.num) ?
 			connector_status_connected :
 			connector_status_disconnected;
 }