Merge remote branch 'keithp/drm-intel-fixes' of /ssd/git/drm-next into drm-fixes

* 'keithp/drm-intel-fixes' of /ssd/git/drm-next:
  drm/i915: Reset GMBUS controller after NAK
  drm/i915: Busy-spin wait_for condition in atomic contexts
  drm/i915/lvds: Always return connected in the absence of better information

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 5daa991..f5b0d83 100644 (file)
--- 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 82d04c5..d3b903b 100644 (file)
--- 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 1a311ad..86cd30b 100644 (file)
--- 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;
 }
 
 /**