[Intel-gfx] [PATCH 1/2] drm/i915: Fix fast wake AUX sync len

[Hogander, Jouni]

On Wed, 2023-03-29 at 20:24 +0300, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> Fast wake should use 8 SYNC pulses for the preamble
> and 10-16 SYNC pulses for the precharge. Recuce our
> fast wake SYNC count to match the maximum value.
> We also use the maximum precharge length for normal
> AUX transactions.
> 
> Cc: Jouni Högander <jouni.hogander at intel.com>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

Reviewed-by: Jouni Högander <jouni.hogander at intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_dp_aux.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux.c
> b/drivers/gpu/drm/i915/display/intel_dp_aux.c
> index eb07dc5d8709..ad0aac707219 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_aux.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_aux.c
> @@ -164,7 +164,7 @@ 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(32) |
> +             DP_AUX_CH_CTL_FW_SYNC_PULSE_SKL(24) |
>               DP_AUX_CH_CTL_SYNC_PULSE_SKL(32);
>  
>         if (intel_tc_port_in_tbt_alt_mode(dig_port))