This is a note to let you know that I've just added the patch titled
drm/bridge: tc358767: do no fail on hi-res displays
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-bridge-tc358767-do-no-fail-on-hi-res-displays.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Thu Feb 1 13:45:42 CET 2018
From: Andrey Gusakov <andrey.gusakov@xxxxxxxxxxxxxxxxxx>
Date: Tue, 7 Nov 2017 19:56:19 +0300
Subject: drm/bridge: tc358767: do no fail on hi-res displays
From: Andrey Gusakov <andrey.gusakov@xxxxxxxxxxxxxxxxxx>
[ Upstream commit cffd2b16c01c3431a7a7dd62e722af33490fc436 ]
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@xxxxxxxxxxxxxx>
Reviewed-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx>
Signed-off-by: Andrey Gusakov <andrey.gusakov@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/1510073785-16108-2-git-send-email-andrey.gusakov@xxxxxxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/bridge/tc358767.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
--- 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 t
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 t
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)
Patches currently in stable-queue which might be from andrey.gusakov@xxxxxxxxxxxxxxxxxx are
queue-4.14/drm-bridge-tc358767-fix-timing-calculations.patch
queue-4.14/drm-bridge-tc358767-fix-auxdatan-registers-access.patch
queue-4.14/drm-bridge-tc358767-filter-out-too-high-modes.patch
queue-4.14/drm-bridge-tc358767-fix-1-lane-behavior.patch
queue-4.14/drm-bridge-tc358767-fix-dp0_misc-register-set.patch
queue-4.14/drm-bridge-tc358767-do-no-fail-on-hi-res-displays.patch