Note to anyone else who might try this (I sent someone this way from IRC who was also wondering the same thing about the XPS 13), these patches don't apply to 4.0-rc1 since they're missing DP_EDP_DPCD_REV (and maybe some other things, haven't dug in thoroughly yet). Also that patch doesn't quite apply on top - just the line number is off, though.
Going to try on drm-intel-nightly 2015y-02m-25d-15h-57m-20s (04996479ce17b980351d69de817e4432134121cd).
- Michael
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 81d40a3..0af59d0 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -4673,6 +4673,9 @@ static const struct dpcd_block i915_dpcd_debug[] = {
{ .offset = DP_SINK_COUNT, .end = DP_ADJUST_REQUEST_LANE2_3 },
{ .offset = DP_SET_POWER },
{ .offset = DP_EDP_DPCD_REV },
+ { .offset = 0x701, .end = 0x704 },
+ { .offset = 0x720, .end = 0x72f },
+ { .offset = 0x732, .end = 0x733 },
};
static int i915_dpcd_show(struct seq_file *m, void *data)
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