On Sat, 23 Sep 2017, vathsala nagaraju <vathsala.nagaraju@xxxxxxxxx> wrote:
> Set frames before SU entry value for max resync frame count of
> dpcd register 2009, bit field 0:3.
>
> v2 :
> - add macro EDP_PSR2_FRAME_BEFORE_SU (Rodrigo)
> - remove EDP_FRAMES_BEFORE_SU_ENTRY (Rodrigo)
> - add check ==1 for dpcd_read call (ville)
>
> v3 : (Rodrigo)
> - move macro EDP_PSR2_FRAME_BEFORE_SU after EDP_PSR2_FRAME_BEFORE_SU
> - replace with &=
>
> Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
> CC: Puthikorn Voravootivat <puthik@xxxxxxxxxxxx>
> Reviewed-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
> Signed-off-by: Vathsala Nagaraju <vathsala.nagaraju@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_reg.h | 2 +-
> drivers/gpu/drm/i915/intel_psr.c | 12 ++++++++++--
> 2 files changed, 11 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 82f36dd..b880c84 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -4047,7 +4047,7 @@ enum {
> #define EDP_PSR2_FRAME_BEFORE_SU_SHIFT 4
> #define EDP_PSR2_FRAME_BEFORE_SU_MASK (0xf<<4)
> #define EDP_PSR2_IDLE_MASK 0xf
> -#define EDP_FRAMES_BEFORE_SU_ENTRY (1<<4)
> +#define EDP_PSR2_FRAME_BEFORE_SU(a) ((a) << EDP_PSR2_FRAME_BEFORE_SU_SHIFT)
In the register definitions we use the shift values directly, not the
macro. That's the style we've adopted. Please stick to it.
Ditto for the indent, why do you remove it?
BR,
Jani.
>
> #define EDP_PSR2_STATUS_CTL _MMIO(0x6f940)
> #define EDP_PSR2_STATUS_STATE_MASK (0xf<<28)
> diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
> index 0a17d1f..adf7abc 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;
> + EDP_SU_TRACK_ENABLE;
> +
> + if (drm_dp_dpcd_readb(&intel_dp->aux, DP_SINK_SYNCHRONIZATION_LATENCY,
> + &sink_latency) == 1) {
> + sink_latency &= DP_MAX_RESYNC_FRAME_CNT_MASK;
> + } else {
> + sink_latency = 0;
> + }
> + val |= EDP_PSR2_FRAME_BEFORE_SU(sink_latency + 1);
>
> if (dev_priv->vbt.psr.tp2_tp3_wakeup_time > 5)
> val |= EDP_PSR2_TP2_TIME_2500;
--
Jani Nikula, Intel Open Source Technology Center
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