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    Subject[PATCH 4.5 083/101] drm/amdgpu: fix DP mode validation
    Date
    4.5-stable review patch.  If anyone has any objections, please let me know.

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

    From: Alex Deucher <alexander.deucher@amd.com>

    commit c47b9e0944e483309d66c807d650ac8b8ceafb57 upstream.

    Switch the order of the loops to walk the rates on the top
    so we exhaust all DP 1.1 rate/lane combinations before trying
    DP 1.2 rate/lane combos.

    This avoids selecting rates that are supported by the monitor,
    but not the connector leading to valid modes getting rejected.

    bug:
    https://bugs.freedesktop.org/show_bug.cgi?id=95206

    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/gpu/drm/amd/amdgpu/atombios_dp.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    --- a/drivers/gpu/drm/amd/amdgpu/atombios_dp.c
    +++ b/drivers/gpu/drm/amd/amdgpu/atombios_dp.c
    @@ -276,8 +276,8 @@ static int amdgpu_atombios_dp_get_dp_lin
    }
    }
    } else {
    - for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) {
    - for (i = 0; i < ARRAY_SIZE(link_rates) && link_rates[i] <= max_link_rate; i++) {
    + for (i = 0; i < ARRAY_SIZE(link_rates) && link_rates[i] <= max_link_rate; i++) {
    + for (lane_num = 1; lane_num <= max_lane_num; lane_num <<= 1) {
    max_pix_clock = (lane_num * link_rates[i] * 8) / bpp;
    if (max_pix_clock >= pix_clock) {
    *dp_lanes = lane_num;

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