drm/i915/intel_i2c: refactor using intel_gmbus_get_adapter
Instead of letting other modules directly access the ->gmbus array,
introduce intel_gmbus_get_adapter() for looking up an i2c_adapter
for a given gmbus port identifier. This will enable later refactoring
of the gmbus port list.
Note: Before requesting an adapter for a given gmbus port number, the
driver must first check its validity using i2c_intel_gmbus_is_port_valid().
If this check fails, a call to intel_gmbus_get_adapter() will WARN_ON and
return NULL. This is relevant for parts of the driver that read a port
from VBIOS, which might be improperly initialized and contain an invalid
port. In these cases, the driver must fall back to using a safer default
port.
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index c5c0973..4f92a11 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -837,8 +837,8 @@
child->device_type != DEVICE_TYPE_LFP)
continue;
- if (child->i2c_pin)
- *i2c_pin = child->i2c_pin;
+ if (intel_gmbus_is_port_valid(child->i2c_pin))
+ *i2c_pin = child->i2c_pin;
/* However, we cannot trust the BIOS writers to populate
* the VBT correctly. Since LVDS requires additional
@@ -979,7 +979,8 @@
* preferred mode is the right one.
*/
intel_lvds->edid = drm_get_edid(connector,
- &dev_priv->gmbus[pin].adapter);
+ intel_gmbus_get_adapter(dev_priv,
+ pin));
if (intel_lvds->edid) {
if (drm_add_edid_modes(connector,
intel_lvds->edid)) {