drm/nouveau: disable hotplug detect around DP link training

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_dp.c b/drivers/gpu/drm/nouveau/nouveau_dp.c
index 184bc9570b1c..64b43958e582 100644
--- a/drivers/gpu/drm/nouveau/nouveau_dp.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dp.c
@@ -23,8 +23,10 @@
  */
 
 #include "drmP.h"
+
 #include "nouveau_drv.h"
 #include "nouveau_i2c.h"
+#include "nouveau_connector.h"
 #include "nouveau_encoder.h"
 
 static int
@@ -271,6 +273,7 @@ nouveau_dp_link_train(struct drm_encoder *encoder)
 {
         struct drm_device *dev = encoder->dev;
         struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
+        struct nouveau_connector *nv_connector;
         struct bit_displayport_encoder_table *dpe;
         int dpe_headerlen;
         uint8_t config[4], status[3];
@@ -279,12 +282,21 @@ nouveau_dp_link_train(struct drm_encoder *encoder)
 
         NV_DEBUG_KMS(dev, "link training!!\n");
 
+        nv_connector = nouveau_encoder_connector_get(nv_encoder);
+        if (!nv_connector)
+                return false;
+
         dpe = nouveau_bios_dp_table(dev, nv_encoder->dcb, &dpe_headerlen);
         if (!dpe) {
                 NV_ERROR(dev, "SOR-%d: no DP encoder table!\n", nv_encoder->or);
                 return false;
         }
 
+        /* disable hotplug detect, this flips around on some panels during
+         * link training.
+         */
+        nv50_gpio_irq_enable(dev, nv_connector->dcb->gpio_tag, false);
+
         if (dpe->script0) {
                 NV_DEBUG_KMS(dev, "SOR-%d: running DP script 0\n", nv_encoder->or);
                 nouveau_bios_run_init_table(dev, le16_to_cpu(dpe->script0),
@@ -423,6 +435,9 @@ stop:
                                             nv_encoder->dcb);
         }
 
+        /* re-enable hotplug detect */
+        nv50_gpio_irq_enable(dev, nv_connector->dcb->gpio_tag, true);
+
         return eq_done;
 }