Several compliance tests require that follow-up AUX transactions (after a failure or no response) are not resent sooner than 400us later. Add a 400us delay to the response time of any failed transaction to account for this.
Signed-off-by: Todd Previte <[email protected]> --- drivers/gpu/drm/i915/intel_dp.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 3bd1780..43fcabe 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -561,8 +561,12 @@ intel_dp_aux_ch(struct intel_dp *intel_dp, DP_AUX_CH_CTL_RECEIVE_ERROR); if (status & (DP_AUX_CH_CTL_TIME_OUT_ERROR | - DP_AUX_CH_CTL_RECEIVE_ERROR)) + DP_AUX_CH_CTL_RECEIVE_ERROR)) { + /* 400us delay between transactions for errors/timeouts + required for DP compliance testing */ + udelay(400); continue; + } if (status & DP_AUX_CH_CTL_DONE) break; } -- 1.9.1 _______________________________________________ Intel-gfx mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/intel-gfx
