Merge branch 'drm-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6

* 'drm-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6: (204 commits)
  agp: intel-agp: do not use PCI resources before pci_enable_device()
  agp: efficeon-agp: do not use PCI resources before pci_enable_device()
  drm: kill BKL from common code
  drm/kms: Simplify setup of the initial I2C encoder config.
  drm,io-mapping: Specify slot to use for atomic mappings
  drm/radeon/kms: only expose underscan on avivo chips
  drm/radeon: add new pci ids
  drm: Cleanup after failing to create master->unique and dev->name
  drm/radeon: tone down overchatty acpi debug messages.
  drm/radeon/kms: enable underscan option for digital connectors
  drm/radeon/kms: fix calculation of h/v scaling factors
  drm/radeon/kms/igp: sideport is AMD only
  drm/radeon/kms: handle the case of no active displays properly in the bandwidth code
  drm: move ttm global code to core drm
  drm/i915: Clear the Ironlake dithering flags when the pipe doesn't want it.
  drm/radeon/kms: make sure HPD is set to NONE on analog-only connectors
  drm/radeon/kms: make sure rio_mem is valid before unmapping it
  drm/agp/i915: trim stolen space to 32M
  drm/i915: Unset cursor if out-of-bounds upon mode change (v4)
  drm/i915: Unreference object not handle on creation
  ...

1 files changed, 42 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_i2c.c b/drivers/gpu/drm/nouveau/nouveau_i2c.c
index 316a3c7e6eb4..cb0cb34440c6 100644
--- a/drivers/gpu/drm/nouveau/nouveau_i2c.c
+++ b/drivers/gpu/drm/nouveau/nouveau_i2c.c
@@ -278,3 +278,45 @@ nouveau_i2c_find(struct drm_device *dev, int index)
 	return i2c->chan;
 }
 
+bool
+nouveau_probe_i2c_addr(struct nouveau_i2c_chan *i2c, int addr)
+{
+	uint8_t buf[] = { 0 };
+	struct i2c_msg msgs[] = {
+		{
+			.addr = addr,
+			.flags = 0,
+			.len = 1,
+			.buf = buf,
+		},
+		{
+			.addr = addr,
+			.flags = I2C_M_RD,
+			.len = 1,
+			.buf = buf,
+		}
+	};
+
+	return i2c_transfer(&i2c->adapter, msgs, 2) == 2;
+}
+
+int
+nouveau_i2c_identify(struct drm_device *dev, const char *what,
+		     struct i2c_board_info *info, int index)
+{
+	struct nouveau_i2c_chan *i2c = nouveau_i2c_find(dev, index);
+	int i;
+
+	NV_DEBUG(dev, "Probing %ss on I2C bus: %d\n", what, index);
+
+	for (i = 0; info[i].addr; i++) {
+		if (nouveau_probe_i2c_addr(i2c, info[i].addr)) {
+			NV_INFO(dev, "Detected %s: %s\n", what, info[i].type);
+			return i;
+		}
+	}
+
+	NV_DEBUG(dev, "No devices found.\n");
+
+	return -ENODEV;
+}