From: Jani Nikula Date: Mon, 22 Oct 2012 13:12:17 +0000 (+0300) Subject: drm/i915/sdvo: force GPIO bit-banging also on default pin X-Git-Tag: upstream/snapshot3+hdmi~5999^2~193^2~112 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=6cb1612a7dc4c3d5ed86dba5dd21bb48a5c395af;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git drm/i915/sdvo: force GPIO bit-banging also on default pin commit 63abf3edaf42d0b9f278df90fe41c7ed4796b6b1 Author: Chris Wilson Date: Wed Dec 8 16:48:21 2010 +0000 drm/i915/sdvo: Only use the SDVO pin if it is in the valid range added a default fallback if BIOS provides an invalid pin mapping, but failed to force GPIO bit-banging on it. Finish the job, and also clean up the function a bit. With bit-banging, setting the gmbus speed has no effect, so drop it. Signed-off-by: Jani Nikula [danvet: Extend comment about gmbus in the code a bit.] Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c index 0007a4d..9ea545e 100644 --- a/drivers/gpu/drm/i915/intel_sdvo.c +++ b/drivers/gpu/drm/i915/intel_sdvo.c @@ -2042,17 +2042,17 @@ intel_sdvo_select_i2c_bus(struct drm_i915_private *dev_priv, else mapping = &dev_priv->sdvo_mappings[1]; - pin = GMBUS_PORT_DPB; - if (mapping->initialized) + if (mapping->initialized && intel_gmbus_is_port_valid(mapping->i2c_pin)) pin = mapping->i2c_pin; + else + pin = GMBUS_PORT_DPB; - if (intel_gmbus_is_port_valid(pin)) { - sdvo->i2c = intel_gmbus_get_adapter(dev_priv, pin); - intel_gmbus_set_speed(sdvo->i2c, GMBUS_RATE_1MHZ); - intel_gmbus_force_bit(sdvo->i2c, true); - } else { - sdvo->i2c = intel_gmbus_get_adapter(dev_priv, GMBUS_PORT_DPB); - } + sdvo->i2c = intel_gmbus_get_adapter(dev_priv, pin); + + /* With gmbus we should be able to drive sdvo i2c at 2MHz, but somehow + * our code totally fails once we start using gmbus. Hence fall back to + * bit banging for now. */ + intel_gmbus_force_bit(sdvo->i2c, true); } static bool