3 files changed, 24 insertions, 13 deletions

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 5daa991cb287..f5b0d8306d83 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -39,7 +39,7 @@
                         ret__ = -ETIMEDOUT;                             \
                         break;                                          \
                 }                                                       \
-                if (W && !in_dbg_master()) msleep(W);                   \
+                if (W && !(in_atomic() || in_dbg_master())) msleep(W);  \
         }                                                               \
         ret__;                                                          \
 })
diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c
index 82d04c5899d2..d3b903bce7c5 100644
--- a/drivers/gpu/drm/i915/intel_i2c.c
+++ b/drivers/gpu/drm/i915/intel_i2c.c
@@ -259,7 +259,7 @@ gmbus_xfer(struct i2c_adapter *adapter,
                                 if (wait_for(I915_READ(GMBUS2 + reg_offset) & (GMBUS_SATOER | GMBUS_HW_RDY), 50))
                                         goto timeout;
                                 if (I915_READ(GMBUS2 + reg_offset) & GMBUS_SATOER)
-                                        return 0;
+                                        goto clear_err;
 
                                 val = I915_READ(GMBUS3 + reg_offset);
                                 do {
@@ -287,7 +287,7 @@ gmbus_xfer(struct i2c_adapter *adapter,
                                 if (wait_for(I915_READ(GMBUS2 + reg_offset) & (GMBUS_SATOER | GMBUS_HW_RDY), 50))
                                         goto timeout;
                                 if (I915_READ(GMBUS2 + reg_offset) & GMBUS_SATOER)
-                                        return 0;
+                                        goto clear_err;
 
                                 val = loop = 0;
                                 do {
@@ -302,14 +302,31 @@ gmbus_xfer(struct i2c_adapter *adapter,
                 if (i + 1 < num && wait_for(I915_READ(GMBUS2 + reg_offset) & (GMBUS_SATOER | GMBUS_HW_WAIT_PHASE), 50))
                         goto timeout;
                 if (I915_READ(GMBUS2 + reg_offset) & GMBUS_SATOER)
-                        return 0;
+                        goto clear_err;
         }
 
-        return num;
+        goto done;
+
+clear_err:
+        /* Toggle the Software Clear Interrupt bit. This has the effect
+         * of resetting the GMBUS controller and so clearing the
+         * BUS_ERROR raised by the slave's NAK.
+         */
+        I915_WRITE(GMBUS1 + reg_offset, GMBUS_SW_CLR_INT);
+        I915_WRITE(GMBUS1 + reg_offset, 0);
+
+done:
+        /* Mark the GMBUS interface as disabled. We will re-enable it at the
+         * start of the next xfer, till then let it sleep.
+         */
+        I915_WRITE(GMBUS0 + reg_offset, 0);
+        return i;
 
 timeout:
         DRM_INFO("GMBUS timed out, falling back to bit banging on pin %d [%s]\n",
                  bus->reg0 & 0xff, bus->adapter.name);
+        I915_WRITE(GMBUS0 + reg_offset, 0);
+
         /* Hardware may not support GMBUS over these pins? Try GPIO bitbanging instead. */
         bus->force_bit = intel_gpio_create(dev_priv, bus->reg0 & 0xff);
         if (!bus->force_bit)
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 1a311ad01116..86cd30bcb619 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -473,19 +473,13 @@ static enum drm_connector_status
 intel_lvds_detect(struct drm_connector *connector, bool force)
 {
         struct drm_device *dev = connector->dev;
-        enum drm_connector_status status = connector_status_connected;
+        enum drm_connector_status status;
 
         status = intel_panel_detect(dev);
         if (status != connector_status_unknown)
                 return status;
 
-        /* ACPI lid methods were generally unreliable in this generation, so
-         * don't even bother.
-         */
-        if (IS_GEN2(dev) || IS_GEN3(dev))
-                return connector_status_connected;
-
-        return status;
+        return connector_status_connected;
 }
 
 /**