drm/bridge: tc358767: do no fail on hi-res displays

Do not fail data rates higher than 2.7 and more than 2 lanes.
Try to fall back to 2.7Gbps and 2 lanes.

Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Andrey Gusakov <andrey.gusakov@cogentembedded.com>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1510073785-16108-2-git-send-email-andrey.gusakov@cogentembedded.com

1 files changed, 9 insertions, 5 deletions

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index 8571cfd877c5..e1996dbfb0a1 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -603,8 +603,15 @@ static int tc_get_display_props(struct tc_data *tc)
         ret = drm_dp_link_probe(&tc->aux, &tc->link.base);
         if (ret < 0)
                 goto err_dpcd_read;
-        if ((tc->link.base.rate != 162000) && (tc->link.base.rate != 270000))
-                goto err_dpcd_inval;
+        if (tc->link.base.rate != 162000 && tc->link.base.rate != 270000) {
+                dev_dbg(tc->dev, "Falling to 2.7 Gbps rate\n");
+                tc->link.base.rate = 270000;
+        }
+
+        if (tc->link.base.num_lanes > 2) {
+                dev_dbg(tc->dev, "Falling to 2 lanes\n");
+                tc->link.base.num_lanes = 2;
+        }
 
         ret = drm_dp_dpcd_readb(&tc->aux, DP_MAX_DOWNSPREAD, tmp);
         if (ret < 0)
@@ -637,9 +644,6 @@ static int tc_get_display_props(struct tc_data *tc)
 err_dpcd_read:
         dev_err(tc->dev, "failed to read DPCD: %d\n", ret);
         return ret;
-err_dpcd_inval:
-        dev_err(tc->dev, "invalid DPCD\n");
-        return -EINVAL;
 }
 
 static int tc_set_video_mode(struct tc_data *tc, struct drm_display_mode *mode)