DP 1.2 compatible displays may report a 5.4Gbps maximum bandwidth which the driver will treat as an invalid value and use 1.62Gbps instead. Fix this by capping to 2.7Gbps anything beyond the DP 1.1 bandwidth range.
Signed-off-by: Imre Deak <[email protected]> --- drivers/gpu/drm/i915/intel_dp.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 11eb697..c6dd61f 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -71,11 +71,16 @@ intel_dp_max_link_bw(struct intel_dp *intel_dp) { int max_link_bw = intel_dp->dpcd[DP_MAX_LINK_RATE]; + if (max_link_bw > DP_LINK_BW_2_7) + return DP_LINK_BW_2_7; + switch (max_link_bw) { case DP_LINK_BW_1_62: case DP_LINK_BW_2_7: break; default: + WARN(1, "invalid max DP link bw val %x, using 1.62Gbps\n", + max_link_bw); max_link_bw = DP_LINK_BW_1_62; break; } -- 1.8.1.2 _______________________________________________ Intel-gfx mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/intel-gfx
