diff options
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_dp_aux.c | 32 |
1 files changed, 29 insertions, 3 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux.c b/drivers/gpu/drm/i915/display/intel_dp_aux.c index fa1fbac6f543..705915d50565 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_aux.c +++ b/drivers/gpu/drm/i915/display/intel_dp_aux.c @@ -119,6 +119,32 @@ static u32 skl_get_aux_clock_divider(struct intel_dp *intel_dp, int index) return index ? 0 : 1; } +static int intel_dp_aux_sync_len(void) +{ + int precharge = 16; /* 10-16 */ + int preamble = 16; + + return precharge + preamble; +} + +static int intel_dp_aux_fw_sync_len(void) +{ + int precharge = 16; /* 10-16 */ + int preamble = 8; + + return precharge + preamble; +} + +static int g4x_dp_aux_precharge_len(void) +{ + int precharge_min = 10; + int preamble = 16; + + /* HW wants the length of the extra precharge in 2us units */ + return (intel_dp_aux_sync_len() - + precharge_min - preamble) / 2; +} + static u32 g4x_get_aux_send_ctl(struct intel_dp *intel_dp, int send_bytes, u32 aux_clock_divider) @@ -141,7 +167,7 @@ static u32 g4x_get_aux_send_ctl(struct intel_dp *intel_dp, timeout | DP_AUX_CH_CTL_RECEIVE_ERROR | (send_bytes << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) | - (3 << DP_AUX_CH_CTL_PRECHARGE_2US_SHIFT) | + (g4x_dp_aux_precharge_len() << DP_AUX_CH_CTL_PRECHARGE_2US_SHIFT) | (aux_clock_divider << DP_AUX_CH_CTL_BIT_CLOCK_2X_SHIFT); } @@ -165,8 +191,8 @@ static u32 skl_get_aux_send_ctl(struct intel_dp *intel_dp, DP_AUX_CH_CTL_TIME_OUT_MAX | DP_AUX_CH_CTL_RECEIVE_ERROR | (send_bytes << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) | - DP_AUX_CH_CTL_FW_SYNC_PULSE_SKL(24) | - DP_AUX_CH_CTL_SYNC_PULSE_SKL(32); + DP_AUX_CH_CTL_FW_SYNC_PULSE_SKL(intel_dp_aux_fw_sync_len()) | + DP_AUX_CH_CTL_SYNC_PULSE_SKL(intel_dp_aux_sync_len()); if (intel_tc_port_in_tbt_alt_mode(dig_port)) ret |= DP_AUX_CH_CTL_TBT_IO; |