Commit 6e2eb00f authored by Dave Airlie's avatar Dave Airlie

Merge tag 'drm-intel-fixes-2015-06-11' of git://anongit.freedesktop.org/drm-intel into drm-fixes

Fix for the regression Linus called out, and another for probing
dongles.

* tag 'drm-intel-fixes-2015-06-11' of git://anongit.freedesktop.org/drm-intel:
  drm/i915: Fix DDC probe for passive adapters
  drm/i915: Properly initialize SDVO analog connectors
parents 950c3707 3f5f1554
......@@ -435,7 +435,7 @@ gmbus_xfer(struct i2c_adapter *adapter,
struct intel_gmbus,
adapter);
struct drm_i915_private *dev_priv = bus->dev_priv;
int i, reg_offset;
int i = 0, inc, try = 0, reg_offset;
int ret = 0;
intel_aux_display_runtime_get(dev_priv);
......@@ -448,12 +448,14 @@ gmbus_xfer(struct i2c_adapter *adapter,
reg_offset = dev_priv->gpio_mmio_base;
retry:
I915_WRITE(GMBUS0 + reg_offset, bus->reg0);
for (i = 0; i < num; i++) {
for (; i < num; i += inc) {
inc = 1;
if (gmbus_is_index_read(msgs, i, num)) {
ret = gmbus_xfer_index_read(dev_priv, &msgs[i]);
i += 1; /* set i to the index of the read xfer */
inc = 2; /* an index read is two msgs */
} else if (msgs[i].flags & I2C_M_RD) {
ret = gmbus_xfer_read(dev_priv, &msgs[i], 0);
} else {
......@@ -525,6 +527,18 @@ gmbus_xfer(struct i2c_adapter *adapter,
adapter->name, msgs[i].addr,
(msgs[i].flags & I2C_M_RD) ? 'r' : 'w', msgs[i].len);
/*
* Passive adapters sometimes NAK the first probe. Retry the first
* message once on -ENXIO for GMBUS transfers; the bit banging algorithm
* has retries internally. See also the retry loop in
* drm_do_probe_ddc_edid, which bails out on the first -ENXIO.
*/
if (ret == -ENXIO && i == 0 && try++ == 0) {
DRM_DEBUG_KMS("GMBUS [%s] NAK on first message, retry\n",
adapter->name);
goto retry;
}
goto out;
timeout:
......
......@@ -2550,7 +2550,7 @@ intel_sdvo_analog_init(struct intel_sdvo *intel_sdvo, int device)
DRM_DEBUG_KMS("initialising analog device %d\n", device);
intel_sdvo_connector = kzalloc(sizeof(*intel_sdvo_connector), GFP_KERNEL);
intel_sdvo_connector = intel_sdvo_connector_alloc();
if (!intel_sdvo_connector)
return false;
......
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