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authorAndrey Gusakov <andrey.gusakov@cogentembedded.com>2017-11-07 19:56:19 +0300
committerAndrzej Hajda <a.hajda@samsung.com>2017-11-30 07:55:17 +0100
commitcffd2b16c01c3431a7a7dd62e722af33490fc436 (patch)
tree5306008ece5340f688266101a4a7c644569604ef /drivers
parentdbb58bfd9ae6c885b2ca001a9a5ab8b881fb4ba9 (diff)
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
Diffstat (limited to 'drivers')
-rw-r--r--drivers/gpu/drm/bridge/tc358767.c14
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)