[PATCH] drm/radeon: dp only enable enhanced framing if sink supports.

[Alex Deucher]

On Sun, Mar 18, 2012 at 6:10 AM, Dave Airlie <airlied at gmail.com> wrote:
> From: Dave Airlie <airlied at redhat.com>
>
> DisplayPort spec v1.1a, Table 2-52.
>
> Same commit to Intel by ajax in 9962c9252e46eda7058067cbe73bdf1ed74b0d37
>
> Signed-off-by: Dave Airlie <airlied at redhat.com>

Reviewed-by: Alex Deucher <alexander.deucher at amd.com>

> ---
>  drivers/gpu/drm/radeon/atombios_dp.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
> index 552b436..191218a 100644
> --- a/drivers/gpu/drm/radeon/atombios_dp.c
> +++ b/drivers/gpu/drm/radeon/atombios_dp.c
> @@ -746,7 +746,8 @@ static int radeon_dp_link_train_init(struct radeon_dp_link_train_info *dp_info)
>
>        /* set the lane count on the sink */
>        tmp = dp_info->dp_lane_count;
> -       if (dp_info->dpcd[0] >= 0x11)
> +       if (dp_info->dpcd[DP_DPCD_REV] >= 0x11 &&
> +           dp_info->dpcd[DP_MAX_LANE_COUNT] & DP_ENHANCED_FRAME_CAP)
>                tmp |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
>        radeon_write_dpcd_reg(dp_info->radeon_connector, DP_LANE_COUNT_SET, tmp);
>
> --
> 1.7.7.6
>
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