> On Sep 20, 2017, at 7:33 AM, Nagaraju, Vathsala <vathsala.nagaraju@xxxxxxxxx> wrote:
>
> Set frames before SU entry value for max resync frame count of
> dpcd register 2009, bit field 0:3.
>
> Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
> CC: Puthikorn Voravootivat <puthik@xxxxxxxxxxxx>
> Signed-off-by: Vathsala Nagaraju <vathsala.nagaraju@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_psr.c | 12 ++++++++++--
> 1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
> index acb5094..04b253f 100644
> --- a/drivers/gpu/drm/i915/intel_psr.c
> +++ b/drivers/gpu/drm/i915/intel_psr.c
> @@ -327,6 +327,7 @@ static void hsw_activate_psr2(struct intel_dp *intel_dp)
> */
> uint32_t idle_frames = max(6, dev_priv->vbt.psr.idle_frames);
> uint32_t val;
> + uint8_t sink_latency;
>
> val = idle_frames << EDP_PSR_IDLE_FRAME_SHIFT;
>
> @@ -334,8 +335,15 @@ static void hsw_activate_psr2(struct intel_dp *intel_dp)
> * mesh at all with our frontbuffer tracking. And the hw alone isn't
> * good enough. */
> val |= EDP_PSR2_ENABLE |
> - EDP_SU_TRACK_ENABLE |
> - EDP_FRAMES_BEFORE_SU_ENTRY;
Please also remove the definition of this su_entry since it was not following the new standards anyway...
Probably good to replace with function macro style for better use below...
> + EDP_SU_TRACK_ENABLE;
> +
> + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_SINK_SYNCHRONIZATION_LATENCY,
> + &sink_latency)) {
> + sink_latency = sink_latency & DP_MAX_RESYNC_FRAME_CNT_MASK;
> + val |= (sink_latency + 1) << EDP_PSR2_FRAME_BEFORE_SU_SHIFT;
... so you could use
val |= EDP_PSR2_FRAME_BEFORE_SU(sink_latency +1);
> + } else {
> + val |= EDP_FRAMES_BEFORE_SU_ENTRY;
> + }
>
> if (dev_priv->vbt.psr.tp2_tp3_wakeup_time > 5)
> val |= EDP_PSR2_TP2_TIME_2500;
> --
> 1.9.1
>
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