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    Subject[PATCH AUTOSEL for 4.14 080/100] drm/bridge: tc358767: do no fail on hi-res displays
    Date
    From: Andrey Gusakov <andrey.gusakov@cogentembedded.com>

    [ 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@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>
    ---
    drivers/gpu/drm/bridge/tc358767.c | 14 +++++++++-----
    1 file 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)
    --
    2.11.0
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