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    Subject[PATCH 4.5 174/238] drm/radeon: Dont drop DP 2.7 Ghz link setup on some cards.
    Date
    4.5-stable review patch.  If anyone has any objections, please let me know.

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

    From: Mario Kleiner <mario.kleiner.de@gmail.com>

    commit 459ee1c3fd097ab56ababd8ff4bb7ef6a792de33 upstream.

    As observed on Apple iMac10,1, DCE-3.2, RV-730,
    link rate of 2.7 Ghz is not selected, because
    the args.v1.ucConfig flag setting for 2.7 Ghz
    gets overwritten by a following assignment of
    the transmitter to use.

    Move link rate setup a few lines down to fix this.
    In practice this didn't have any positive or
    negative effect on display setup on the tested
    iMac10,1 so i don't know if backporting to stable
    makes sense or not.

    Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/gpu/drm/radeon/atombios_encoders.c | 6 ++++--
    1 file changed, 4 insertions(+), 2 deletions(-)

    --- a/drivers/gpu/drm/radeon/atombios_encoders.c
    +++ b/drivers/gpu/drm/radeon/atombios_encoders.c
    @@ -892,8 +892,6 @@ atombios_dig_encoder_setup2(struct drm_e
    else
    args.v1.ucLaneNum = 4;

    - if (ENCODER_MODE_IS_DP(args.v1.ucEncoderMode) && (dp_clock == 270000))
    - args.v1.ucConfig |= ATOM_ENCODER_CONFIG_DPLINKRATE_2_70GHZ;
    switch (radeon_encoder->encoder_id) {
    case ENCODER_OBJECT_ID_INTERNAL_UNIPHY:
    args.v1.ucConfig = ATOM_ENCODER_CONFIG_V2_TRANSMITTER1;
    @@ -910,6 +908,10 @@ atombios_dig_encoder_setup2(struct drm_e
    args.v1.ucConfig |= ATOM_ENCODER_CONFIG_LINKB;
    else
    args.v1.ucConfig |= ATOM_ENCODER_CONFIG_LINKA;
    +
    + if (ENCODER_MODE_IS_DP(args.v1.ucEncoderMode) && (dp_clock == 270000))
    + args.v1.ucConfig |= ATOM_ENCODER_CONFIG_DPLINKRATE_2_70GHZ;
    +
    break;
    case 2:
    case 3:

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