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

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[ Upstream commit cffd2b16c0 ]

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
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andrey Gusakov
2017-11-07 19:56:19 +03:00
committed by Greg Kroah-Hartman
parent 7b8623841f
commit 5f6a0441ca
1 changed files with 9 additions and 5 deletions
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14
drivers/gpu/drm/bridge/tc358767.c
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@@ -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)