On Tue, 2018-04-03 at 14:24 -0700, Dhinakaran Pandiyan wrote:
> Timestamps are useful for IGT tests that trigger PSR exit and/or wait
> for
> PSR entry.
>
> v2: Removed seqlock (Ville)
> Removed erroneous warning in irq loop (Chris)
>
> Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
> Cc: Rodrigo Vivi <rodrigo.v...@intel.com>
> Cc: Chris Wilson <ch...@chris-wilson.co.uk>
> Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandi...@intel.com>
Reviewed-by: Jose Roberto de Souza <jose.so...@intel.com>
> ---
> drivers/gpu/drm/i915/i915_debugfs.c | 7 +++++++
> drivers/gpu/drm/i915/i915_drv.h | 2 ++
> drivers/gpu/drm/i915/intel_psr.c | 9 +++++++--
> 3 files changed, 16 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
> b/drivers/gpu/drm/i915/i915_debugfs.c
> index 28f91df5b401..b378fa013054 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -2686,6 +2686,13 @@ static int i915_edp_psr_status(struct seq_file
> *m, void *data)
> }
> mutex_unlock(&dev_priv->psr.lock);
>
> + if (READ_ONCE(dev_priv->psr.debug)) {
> + seq_printf(m, "Last attempted entry at: %lld\n",
> + dev_priv->psr.last_entry_attempt);
> + seq_printf(m, "Last exit at: %lld\n",
> + dev_priv->psr.last_exit);
> + }
> +
> intel_runtime_pm_put(dev_priv);
> return 0;
> }
> diff --git a/drivers/gpu/drm/i915/i915_drv.h
> b/drivers/gpu/drm/i915/i915_drv.h
> index b97ed0cd4ca9..2124a795d10c 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -610,6 +610,8 @@ struct i915_psr {
> bool psr2_enabled;
> u8 sink_sync_latency;
> bool debug;
> + ktime_t last_entry_attempt;
> + ktime_t last_exit;
>
> void (*enable_source)(struct intel_dp *,
> const struct intel_crtc_state *);
> diff --git a/drivers/gpu/drm/i915/intel_psr.c
> b/drivers/gpu/drm/i915/intel_psr.c
> index 56ff2d7691a1..a11a6d940203 100644
> --- a/drivers/gpu/drm/i915/intel_psr.c
> +++ b/drivers/gpu/drm/i915/intel_psr.c
> @@ -131,6 +131,7 @@ void intel_psr_irq_handler(struct
> drm_i915_private *dev_priv, u32 psr_iir)
> {
> u32 transcoders = BIT(TRANSCODER_EDP);
> enum transcoder cpu_transcoder;
> + ktime_t time_ns = ktime_get();
>
> if (INTEL_GEN(dev_priv) >= 8)
> transcoders |= BIT(TRANSCODER_A) |
> @@ -143,13 +144,17 @@ void intel_psr_irq_handler(struct
> drm_i915_private *dev_priv, u32 psr_iir)
> DRM_DEBUG_KMS("[transcoder %s] PSR aux
> error\n",
> transcoder_name(cpu_transcoder
> ));
>
> - if (psr_iir & EDP_PSR_PRE_ENTRY(cpu_transcoder))
> + if (psr_iir & EDP_PSR_PRE_ENTRY(cpu_transcoder)) {
> + dev_priv->psr.last_entry_attempt = time_ns;
> DRM_DEBUG_KMS("[transcoder %s] PSR entry
> attempt in 2 vblanks\n",
> transcoder_name(cpu_transcoder
> ));
> + }
>
> - if (psr_iir & EDP_PSR_POST_EXIT(cpu_transcoder))
> + if (psr_iir & EDP_PSR_POST_EXIT(cpu_transcoder)) {
> + dev_priv->psr.last_exit = time_ns;
> DRM_DEBUG_KMS("[transcoder %s] PSR exit
> completed\n",
> transcoder_name(cpu_transcoder
> ));
> + }
> }
> }
>
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