drm/radeon/kms: unify i2c handling

Previously we added i2c buses as needed when enumerating connectors
power management, etc.  This only exposed the actual buses used and
could have lead to the same buse getting created more than once if
one buses was used for more than one purpose.  This patch sets up
all i2c buses on the card in one place and users of the buses just
point back to the one instance.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 69 insertions, 8 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_combios.c b/drivers/gpu/drm/radeon/radeon_combios.c
index 5e1474cde4b..18c84cf3eaf 100644
--- a/drivers/gpu/drm/radeon/radeon_combios.c
+++ b/drivers/gpu/drm/radeon/radeon_combios.c
@@ -479,6 +479,17 @@ radeon_combios_get_hardcoded_edid(struct radeon_device *rdev)
 	return NULL;
 }
 
+/* standard i2c gpio lines */
+#define RADEON_I2C_MONID_ID 0
+#define RADEON_I2C_DVI_ID   1
+#define RADEON_I2C_VGA_ID   2
+#define RADEON_I2C_CRT2_ID  3
+#define RADEON_I2C_MM_ID    4
+/* custom defined gpio lines */
+#define RADEON_I2C_LCD_ID   5 /* ddc for laptop panels */
+#define RADEON_I2C_GPIO_ID  6 /* rs4xx gpio ddc */
+#define RADEON_I2C_DVO_ID   7 /* i2c bus for dvo */
+
 static struct radeon_i2c_bus_rec combios_setup_i2c_bus(struct radeon_device *rdev,
 						       int ddc_line)
 {
@@ -599,7 +610,24 @@ static struct radeon_i2c_bus_rec combios_setup_i2c_bus(struct radeon_device *rde
 		break;
 	}
 	i2c.mm_i2c = false;
-	i2c.i2c_id = 0;
+
+	switch (ddc_line) {
+	case RADEON_GPIO_MONID:
+		i2c.i2c_id = RADEON_I2C_MONID_ID;
+		break;
+	case RADEON_GPIO_DVI_DDC:
+		i2c.i2c_id = RADEON_I2C_DVI_ID;
+		break;
+	case RADEON_GPIO_VGA_DDC:
+		i2c.i2c_id = RADEON_I2C_VGA_ID;
+		break;
+	case RADEON_GPIO_CRT2_DDC:
+		i2c.i2c_id = RADEON_I2C_CRT2_ID;
+		break;
+	default:
+		i2c.i2c_id = 0xff;
+		break;
+	}
 	i2c.hpd = RADEON_HPD_NONE;
 
 	if (ddc_line)
@@ -610,6 +638,30 @@ static struct radeon_i2c_bus_rec combios_setup_i2c_bus(struct radeon_device *rde
 	return i2c;
 }
 
+void radeon_combios_i2c_init(struct radeon_device *rdev)
+{
+	struct drm_device *dev = rdev->ddev;
+	struct radeon_i2c_bus_rec i2c;
+
+	i2c = combios_setup_i2c_bus(rdev, RADEON_GPIO_MONID);
+	rdev->i2c_bus[0] = radeon_i2c_create(dev, &i2c, "MONID");
+
+	i2c = combios_setup_i2c_bus(rdev, RADEON_GPIO_DVI_DDC);
+	rdev->i2c_bus[1] = radeon_i2c_create(dev, &i2c, "DVI_DDC");
+
+	i2c = combios_setup_i2c_bus(rdev, RADEON_GPIO_VGA_DDC);
+	rdev->i2c_bus[2] = radeon_i2c_create(dev, &i2c, "VGA_DDC");
+
+	i2c = combios_setup_i2c_bus(rdev, RADEON_GPIO_CRT2_DDC);
+	rdev->i2c_bus[3] = radeon_i2c_create(dev, &i2c, "CRT2_DDC");
+
+	i2c.valid = true;
+	i2c.hw_capable = true;
+	i2c.mm_i2c = true;
+	i2c.i2c_id = RADEON_I2C_MM_ID;
+	rdev->i2c_bus[4] = radeon_i2c_create(dev, &i2c, "MM_I2C");
+}
+
 bool radeon_combios_get_clock_info(struct drm_device *dev)
 {
 	struct radeon_device *rdev = dev->dev_private;
@@ -1248,7 +1300,7 @@ bool radeon_legacy_get_ext_tmds_info_from_table(struct radeon_encoder *encoder,
 
 	/* default for macs */
 	i2c_bus = combios_setup_i2c_bus(rdev, RADEON_GPIO_MONID);
-	tmds->i2c_bus = radeon_i2c_create(dev, &i2c_bus, "DVO");
+	tmds->i2c_bus = radeon_i2c_lookup(rdev, &i2c_bus);
 
 	/* XXX some macs have duallink chips */
 	switch (rdev->mode_info.connector_table) {
@@ -1303,7 +1355,9 @@ bool radeon_legacy_get_ext_tmds_info_from_combios(struct radeon_encoder *encoder
 					i2c_bus.en_data_reg = RADEON_GPIOPAD_EN;
 					i2c_bus.y_clk_reg = RADEON_GPIOPAD_Y;
 					i2c_bus.y_data_reg = RADEON_GPIOPAD_Y;
-					tmds->i2c_bus = radeon_i2c_create(dev, &i2c_bus, "DVO");
+					i2c_bus.i2c_id = RADEON_I2C_DVO_ID;
+					radeon_i2c_add(rdev, &i2c_bus, "DVO");
+					tmds->i2c_bus = radeon_i2c_lookup(rdev, &i2c_bus);
 					tmds->dvo_chip = DVO_SIL164;
 					tmds->slave_addr = 0x70 >> 1; /* 7 bit addressing */
 					break;
@@ -1321,15 +1375,15 @@ bool radeon_legacy_get_ext_tmds_info_from_combios(struct radeon_encoder *encoder
 			switch (gpio) {
 			case DDC_MONID:
 				i2c_bus = combios_setup_i2c_bus(rdev, RADEON_GPIO_MONID);
-				tmds->i2c_bus = radeon_i2c_create(dev, &i2c_bus, "DVO");
+				tmds->i2c_bus = radeon_i2c_lookup(rdev, &i2c_bus);
 				break;
 			case DDC_DVI:
 				i2c_bus = combios_setup_i2c_bus(rdev, RADEON_GPIO_DVI_DDC);
-				tmds->i2c_bus = radeon_i2c_create(dev, &i2c_bus, "DVO");
+				tmds->i2c_bus = radeon_i2c_lookup(rdev, &i2c_bus);
 				break;
 			case DDC_VGA:
 				i2c_bus = combios_setup_i2c_bus(rdev, RADEON_GPIO_VGA_DDC);
-				tmds->i2c_bus = radeon_i2c_create(dev, &i2c_bus, "DVO");
+				tmds->i2c_bus = radeon_i2c_lookup(rdev, &i2c_bus);
 				break;
 			case DDC_CRT2:
 				/* R3xx+ chips don't have GPIO_CRT2_DDC gpio pad */
@@ -1337,13 +1391,14 @@ bool radeon_legacy_get_ext_tmds_info_from_combios(struct radeon_encoder *encoder
 					i2c_bus = combios_setup_i2c_bus(rdev, RADEON_GPIO_MONID);
 				else
 					i2c_bus = combios_setup_i2c_bus(rdev, RADEON_GPIO_CRT2_DDC);
-				tmds->i2c_bus = radeon_i2c_create(dev, &i2c_bus, "DVO");
+				tmds->i2c_bus = radeon_i2c_lookup(rdev, &i2c_bus);
 				break;
 			case DDC_LCD: /* MM i2c */
 				i2c_bus.valid = true;
 				i2c_bus.hw_capable = true;
 				i2c_bus.mm_i2c = true;
-				tmds->i2c_bus = radeon_i2c_create(dev, &i2c_bus, "DVO");
+				i2c_bus.i2c_id = RADEON_I2C_MM_ID;
+				tmds->i2c_bus = radeon_i2c_lookup(rdev, &i2c_bus);
 				break;
 			default:
 				DRM_ERROR("Unsupported gpio %d\n", gpio);
@@ -1926,6 +1981,8 @@ static bool radeon_apply_legacy_quirks(struct drm_device *dev,
 		ddc_i2c->en_data_mask = 0x80;
 		ddc_i2c->y_clk_mask = (0x20 << 8);
 		ddc_i2c->y_data_mask = 0x80;
+		ddc_i2c->i2c_id = RADEON_I2C_GPIO_ID;
+		radeon_i2c_add(rdev, ddc_i2c, "GPIO_DDC");
 	}
 
 	/* R3xx+ chips don't have GPIO_CRT2_DDC gpio pad */
@@ -2318,6 +2375,8 @@ bool radeon_get_legacy_connector_info_from_bios(struct drm_device *dev)
 					    RBIOS32(lcd_ddc_info + 3);
 					ddc_i2c.y_data_mask =
 					    RBIOS32(lcd_ddc_info + 7);
+					ddc_i2c.i2c_id = RADEON_I2C_LCD_ID;
+					radeon_i2c_add(rdev, &ddc_i2c, "LCD");
 					break;
 				case DDC_GPIO:
 					ddc_i2c =
@@ -2339,6 +2398,8 @@ bool radeon_get_legacy_connector_info_from_bios(struct drm_device *dev)
 					    RBIOS32(lcd_ddc_info + 3);
 					ddc_i2c.y_data_mask =
 					    RBIOS32(lcd_ddc_info + 7);
+					ddc_i2c.i2c_id = RADEON_I2C_LCD_ID;
+					radeon_i2c_add(rdev, &ddc_i2c, "LCD");
 					break;
 				default:
 					ddc_i2c.valid = false;