drm/nv50: add function to control GPIO IRQ reporting

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nouveau_drv.h

@@ -1140,6 +1140,7 @@ int nv17_gpio_set(struct drm_device *dev, enum dcb_gpio_tag tag, int state);
 /* nv50_gpio.c */
 int nv50_gpio_get(struct drm_device *dev, enum dcb_gpio_tag tag);
 int nv50_gpio_set(struct drm_device *dev, enum dcb_gpio_tag tag, int state);
+void nv50_gpio_irq_enable(struct drm_device *, enum dcb_gpio_tag, bool on);
 
 /* nv50_calc. */
 int nv50_calc_pll(struct drm_device *, struct pll_lims *, int clk,

drivers/gpu/drm/nouveau/nv50_display.c

@@ -184,7 +184,7 @@ nv50_display_init(struct drm_device *dev)
 	struct nouveau_timer_engine *ptimer = &dev_priv->engine.timer;
 	struct nouveau_channel *evo = dev_priv->evo;
 	struct drm_connector *connector;
-	uint32_t val, ram_amount, hpd_en[2];
+	uint32_t val, ram_amount;
 	uint64_t start;
 	int ret, i;
 
@@ -365,26 +365,10 @@ nv50_display_init(struct drm_device *dev)
 					     NV50_PDISPLAY_INTR_EN_CLK_UNK40));
 
 	/* enable hotplug interrupts */
-	hpd_en[0] = hpd_en[1] = 0;
 	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 		struct nouveau_connector *conn = nouveau_connector(connector);
-		struct dcb_gpio_entry *gpio;
-
-		if (conn->dcb->gpio_tag == 0xff)
-			continue;
-
-		gpio = nouveau_bios_gpio_entry(dev, conn->dcb->gpio_tag);
-		if (!gpio)
-			continue;
 
-		hpd_en[gpio->line >> 4] |= (0x00010001 << (gpio->line & 0xf));
-	}
-
-	nv_wr32(dev, 0xe054, 0xffffffff);
-	nv_wr32(dev, 0xe050, hpd_en[0]);
-	if (dev_priv->chipset >= 0x90) {
-		nv_wr32(dev, 0xe074, 0xffffffff);
-		nv_wr32(dev, 0xe070, hpd_en[1]);
+		nv50_gpio_irq_enable(dev, conn->dcb->gpio_tag, true);
 	}
 
 	return 0;

drivers/gpu/drm/nouveau/nv50_gpio.c

@@ -74,3 +74,22 @@ nv50_gpio_set(struct drm_device *dev, enum dcb_gpio_tag tag, int state)
 	nv_wr32(dev, r, v);
 	return 0;
 }
+
+void
+nv50_gpio_irq_enable(struct drm_device *dev, enum dcb_gpio_tag tag, bool on)
+{
+	struct dcb_gpio_entry *gpio;
+	u32 reg, mask;
+
+	gpio = nouveau_bios_gpio_entry(dev, tag);
+	if (!gpio) {
+		NV_ERROR(dev, "gpio tag 0x%02x not found\n", tag);
+		return;
+	}
+
+	reg  = gpio->line < 16 ? 0xe050 : 0xe070;
+	mask = 0x00010001 << (gpio->line & 0xf);
+
+	nv_wr32(dev, reg + 4, mask);
+	nv_mask(dev, reg + 0, mask, on ? mask : 0);
+}

drivers/gpu/drm/nouveau/nv50_mc.c

@@ -31,7 +31,20 @@
 int
 nv50_mc_init(struct drm_device *dev)
 {
+	struct drm_nouveau_private *dev_priv = dev->dev_private;
+
 	nv_wr32(dev, NV03_PMC_ENABLE, 0xFFFFFFFF);
+
+	/* disable, and ack any pending gpio interrupts
+	 * XXX doesn't technically belong here, but it'll do for the moment
+	 */
+	nv_wr32(dev, 0xe050, 0x00000000);
+	nv_wr32(dev, 0xe054, 0xffffffff);
+	if (dev_priv->chipset >= 0x90) {
+		nv_wr32(dev, 0xe070, 0x00000000);
+		nv_wr32(dev, 0xe074, 0xffffffff);
+	}
+
 	return 0;
 }