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    Subject[PATCH 4.14 107/156] drm/bridge: tc358767: filter out too high modes
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Andrey Gusakov <andrey.gusakov@cogentembedded.com>


    [ Upstream commit 99fc8e963a4c0203dba26a77cf737db6081bca14 ]

    Pixel clock limitation for DPI is 154 MHz. Do not accept modes
    with higher pixel clock rate.

    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/1510073785-16108-3-git-send-email-andrey.gusakov@cogentembedded.com
    Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/gpu/drm/bridge/tc358767.c | 5 ++++-
    1 file changed, 4 insertions(+), 1 deletion(-)

    --- a/drivers/gpu/drm/bridge/tc358767.c
    +++ b/drivers/gpu/drm/bridge/tc358767.c
    @@ -1103,7 +1103,10 @@ static bool tc_bridge_mode_fixup(struct
    static int tc_connector_mode_valid(struct drm_connector *connector,
    struct drm_display_mode *mode)
    {
    - /* Accept any mode */
    + /* DPI interface clock limitation: upto 154 MHz */
    + if (mode->clock > 154000)
    + return MODE_CLOCK_HIGH;
    +
    return MODE_OK;
    }


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