drm/nv40/disp: implement support for hotplug irq

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

drivers/gpu/drm/nouveau/nouveau_state.c

@@ -273,8 +273,11 @@ static int nouveau_init_engine_ptrs(struct drm_device *dev)
 		engine->display.destroy		= nv04_display_destroy;
 		engine->display.init		= nv04_display_init;
 		engine->display.fini		= nv04_display_fini;
+		engine->gpio.init		= nv10_gpio_init;
+		engine->gpio.fini		= nv10_gpio_fini;
 		engine->gpio.drive		= nv10_gpio_drive;
 		engine->gpio.sense		= nv10_gpio_sense;
+		engine->gpio.irq_enable		= nv10_gpio_irq_enable;
 		engine->pm.clocks_get		= nv40_pm_clocks_get;
 		engine->pm.clocks_pre		= nv40_pm_clocks_pre;
 		engine->pm.clocks_set		= nv40_pm_clocks_set;

drivers/gpu/drm/nouveau/nv04_display.c

@@ -31,6 +31,7 @@
 #include "nouveau_hw.h"
 #include "nouveau_encoder.h"
 #include "nouveau_connector.h"
+#include "nouveau_gpio.h"
 
 static void nv04_vblank_crtc0_isr(struct drm_device *);
 static void nv04_vblank_crtc1_isr(struct drm_device *);
@@ -220,6 +221,7 @@ nv04_display_destroy(struct drm_device *dev)
 int
 nv04_display_init(struct drm_device *dev)
 {
+	struct drm_connector *connector;
 	struct drm_encoder *encoder;
 	struct drm_crtc *crtc;
 
@@ -240,6 +242,12 @@ nv04_display_init(struct drm_device *dev)
 	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
 		crtc->funcs->restore(crtc);
 
+	/* enable hotplug interrupts */
+	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+		struct nouveau_connector *conn = nouveau_connector(connector);
+		nouveau_gpio_irq(dev, 0, conn->hpd, 0xff, true);
+	}
+
 	return 0;
 }
 

drivers/gpu/drm/nouveau/nv10_gpio.c

@@ -27,6 +27,7 @@
 #include "drmP.h"
 #include "nouveau_drv.h"
 #include "nouveau_hw.h"
+#include "nouveau_gpio.h"
 
 int
 nv10_gpio_sense(struct drm_device *dev, int line)
@@ -80,3 +81,43 @@ nv10_gpio_drive(struct drm_device *dev, int line, int dir, int out)
 	NVWriteCRTC(dev, 0, reg, mask | (data << line));
 	return 0;
 }
+
+void
+nv10_gpio_irq_enable(struct drm_device *dev, int line, bool on)
+{
+	u32 mask = 0x00010001 << line;
+
+	nv_wr32(dev, 0x001104, mask);
+	nv_mask(dev, 0x001144, mask, on ? mask : 0);
+}
+
+static void
+nv10_gpio_isr(struct drm_device *dev)
+{
+	u32 intr = nv_rd32(dev, 0x1104);
+	u32 hi = (intr & 0x0000ffff) >> 0;
+	u32 lo = (intr & 0xffff0000) >> 16;
+
+	nouveau_gpio_isr(dev, 0, hi | lo);
+
+	nv_wr32(dev, 0x001104, intr);
+}
+
+int
+nv10_gpio_init(struct drm_device *dev)
+{
+	nv_wr32(dev, 0x001140, 0x00000000);
+	nv_wr32(dev, 0x001100, 0xffffffff);
+	nv_wr32(dev, 0x001144, 0x00000000);
+	nv_wr32(dev, 0x001104, 0xffffffff);
+	nouveau_irq_register(dev, 28, nv10_gpio_isr); /* PBUS */
+	return 0;
+}
+
+void
+nv10_gpio_fini(struct drm_device *dev)
+{
+	nv_wr32(dev, 0x001140, 0x00000000);
+	nv_wr32(dev, 0x001144, 0x00000000);
+	nouveau_irq_unregister(dev, 28);
+}