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Commit cffd2b16 authored by Andrey Gusakov's avatar Andrey Gusakov Committed by Andrzej Hajda
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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: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: default avatarAndrzej Hajda <a.hajda@samsung.com>
Signed-off-by: default avatarAndrey Gusakov <andrey.gusakov@cogentembedded.com>
Signed-off-by: default avatarAndrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1510073785-16108-2-git-send-email-andrey.gusakov@cogentembedded.com
parent dbb58bfd

drivers/gpu/drm/bridge/tc358767.c

+9 −5
Original line number Diff line number Diff line
@@ -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)