drm/radeon/dp: fix lane/clock setup for dp 1.2 capable devices
Only DCE5+ asics support DP 1.2. Noticed by ArtForz on IRC. Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Cc: stable@vger.kernel.org
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@ -291,6 +291,19 @@ static int dp_get_max_dp_pix_clock(int link_rate,
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/***** radeon specific DP functions *****/
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static int radeon_dp_get_max_link_rate(struct drm_connector *connector,
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u8 dpcd[DP_DPCD_SIZE])
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{
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int max_link_rate;
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if (radeon_connector_is_dp12_capable(connector))
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max_link_rate = min(drm_dp_max_link_rate(dpcd), 540000);
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else
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max_link_rate = min(drm_dp_max_link_rate(dpcd), 270000);
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return max_link_rate;
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}
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/* First get the min lane# when low rate is used according to pixel clock
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* (prefer low rate), second check max lane# supported by DP panel,
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* if the max lane# < low rate lane# then use max lane# instead.
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@ -300,7 +313,7 @@ static int radeon_dp_get_dp_lane_number(struct drm_connector *connector,
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int pix_clock)
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{
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int bpp = convert_bpc_to_bpp(radeon_get_monitor_bpc(connector));
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int max_link_rate = drm_dp_max_link_rate(dpcd);
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int max_link_rate = radeon_dp_get_max_link_rate(connector, dpcd);
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int max_lane_num = drm_dp_max_lane_count(dpcd);
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int lane_num;
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int max_dp_pix_clock;
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@ -338,7 +351,7 @@ static int radeon_dp_get_dp_link_clock(struct drm_connector *connector,
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return 540000;
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}
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return drm_dp_max_link_rate(dpcd);
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return radeon_dp_get_max_link_rate(connector, dpcd);
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}
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static u8 radeon_dp_encoder_service(struct radeon_device *rdev,
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