drm/i915: use GMBUS to manage i2c links

Use the GMBUS interface rather than direct bit banging to grab the EDID
over DDC (and for other forms of auxiliary communication with external
display controllers). The hope is that this method will be much faster
and more reliable than bit banging for fetching EDIDs from buggy monitors
or through switches, though we still preserve the bit banging as a
fallback in case GMBUS fails.

Based on an original patch by Jesse Barnes.

Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 0 insertions, 6 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 11d643acf2fa..86ea3890aa8a 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2530,12 +2530,6 @@ void intel_encoder_destroy(struct drm_encoder *encoder)
 {
         struct intel_encoder *intel_encoder = to_intel_encoder(encoder);
 
-        if (intel_encoder->ddc_bus)
-                intel_i2c_destroy(intel_encoder->ddc_bus);
-
-        if (intel_encoder->i2c_bus)
-                intel_i2c_destroy(intel_encoder->i2c_bus);
-
         drm_encoder_cleanup(encoder);
         kfree(intel_encoder);
 }