[Bug 78507] [HD-4400]No native resolution 2560x1600 on Lenovo Onelink Pro DisplayPort and X1 Carbon 2014

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78507

Jani Nikula <jani.nikula at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #2 from Jani Nikula <jani.nikula at intel.com> ---
Please try this hack patch on top of nightly:

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index a13f1f51f68e..2020619e2b98 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -591,7 +591,7 @@ static int drm_dp_i2c_do_msg(struct drm_dp_aux *aux, struct
drm_dp_aux_msg *msg)
         * is required to retry at least seven times upon receiving AUX_DEFER
         * before giving up the AUX transaction.
         */
-       for (retry = 0; retry < 7; retry++) {
+       for (retry = 0; retry < 50; retry++) {
                err = aux->transfer(aux, msg);
                if (err < 0) {
                        if (err == -EBUSY)
@@ -649,7 +649,7 @@ static int drm_dp_i2c_do_msg(struct drm_dp_aux *aux, struct
drm_dp_aux_msg *msg)

                case DP_AUX_I2C_REPLY_DEFER:
                        DRM_DEBUG_KMS("I2C defer\n");
-                       usleep_range(400, 500);
+                       usleep_range(1400, 1500);
                        continue;

                default:

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