[Bug 94338] Kernel DRM/i915 init sends eDP panel into self-test loop

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94338

--- Comment #14 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
Just for posterity, here's the tried and failed bare address hack I proposed

(In reply to infernix from comment #0)
> Tried with no effect: http://paste.debian.net/410285/

--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -688,22 +688,7 @@ static int drm_dp_i2c_xfer(struct i2c_adapter *adapter,
struct i2c_msg *msgs,
     for (i = 0; i < num; i++) {
         msg.address = msgs[i].addr;
         drm_dp_i2c_msg_set_request(&msg, &msgs[i]);
-        /* Send a bare address packet to start the transaction.
-         * Zero sized messages specify an address only (bare
-         * address) transaction.
-         */
-        msg.buffer = NULL;
-        msg.size = 0;
-        err = drm_dp_i2c_do_msg(aux, &msg);

-        /*
-         * Reset msg.request in case in case it got
-         * changed into a WRITE_STATUS_UPDATE.
-         */
-        drm_dp_i2c_msg_set_request(&msg, &msgs[i]);
-
-        if (err < 0)
-            break;
         /* We want each transaction to be as large as possible, but
          * we'll go to smaller sizes if the hardware gives us a
          * short reply.

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