From: Jani Nikula Date: Fri, 20 Sep 2013 13:42:14 +0000 (+0300) Subject: drm/i915/dp: retry i2c-over-aux seven times on AUX DEFER X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=58c67ce9f0a0d9f016cded91b652642e2aca9e07;p=linux-beck.git drm/i915/dp: retry i2c-over-aux seven times on AUX DEFER Per DP1.2 spec. Signed-off-by: Jani Nikula Reviewed-by: Todd Previte Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 95a31598feda..5b02f9d069c3 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -654,7 +654,12 @@ intel_dp_i2c_aux_ch(struct i2c_adapter *adapter, int mode, break; } - for (retry = 0; retry < 5; retry++) { + /* + * DP1.2 sections 2.7.7.1.5.6.1 and 2.7.7.1.6.6.1: A DP Source device is + * required to retry at least seven times upon receiving AUX_DEFER + * before giving up the AUX transaction. + */ + for (retry = 0; retry < 7; retry++) { ret = intel_dp_aux_ch(intel_dp, msg, msg_bytes, reply, reply_bytes);