On Wed, 2018-02-14 at 08:03 -0800, Rodrigo Vivi wrote:
> We can still use PSR1 when PSR2 conditions are not met.
>
> So, let's split the check in a way that we make sure has_psr
> gets set independently of PSR2 criteria.
>
> v2: Duh! Handle proper return to avoid breaking PSR2.
>
> Cc: Dhinakaran Pandiyan <dhinakaran.pandi...@intel.com>
> Signed-off-by: Rodrigo Vivi <rodrigo.v...@intel.com>
> ---
> drivers/gpu/drm/i915/intel_psr.c | 55
> ++++++++++++++++++++--------------------
> 1 file changed, 28 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_psr.c
> b/drivers/gpu/drm/i915/intel_psr.c
> index 200c085ba644..56e7050f9042 100644
> --- a/drivers/gpu/drm/i915/intel_psr.c
> +++ b/drivers/gpu/drm/i915/intel_psr.c
> @@ -341,6 +341,33 @@ static void hsw_psr_activate(struct intel_dp *intel_dp)
> hsw_activate_psr1(intel_dp);
> }
>
> +static bool intel_psr2_conditions(struct intel_dp *intel_dp,
> + struct intel_crtc_state *crtc_state)
nit: static bool psr2_config_check()/psr2_config_valid()
> +{
> + struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> + struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
> + const struct drm_display_mode *adjusted_mode =
> + &crtc_state->base.adjusted_mode;
> +
> + /* PSR2 is restricted to work with panel resolutions up to 3640x2304 */
> + if (adjusted_mode->crtc_hdisplay > 3640 ||
> + adjusted_mode->crtc_vdisplay > 2304) {
> + DRM_DEBUG_KMS("PSR2 disabled, panel resolution too big\n");
> + return false;
> + }
> +
> + /*
> + * FIXME:enable psr2 only for y-cordinate psr2 panels
> + * After gtc implementation , remove this restriction.
> + */
> + if (!dev_priv->psr.y_cord_support) {
> + DRM_DEBUG_KMS("PSR2 disabled, panel does not support Y
> coordinate\n");
> + return false;
> + }
> +
> + return true;
> +}
> +
> void intel_psr_compute_config(struct intel_dp *intel_dp,
> struct intel_crtc_state *crtc_state)
> {
> @@ -403,34 +430,8 @@ void intel_psr_compute_config(struct intel_dp *intel_dp,
> return;
> }
>
> - /*
> - * FIXME psr2_support is messed up. It's both computed
> - * dynamically during PSR enable, and extracted from sink
> - * caps during eDP detection.
> - */
1) edp_init_dpcd sets dev_priv->psr.psr2_support if sink supports psr2
2) compute_config sets crtc_state.has_psr2 if configuration can support
psr2
3) psr_enable copies crtc_state.has_psr2 to dev_priv->psr.psr2_support.
4) psr_activate, enable_source, enable_sink etc check
dev_priv->psr.psr2_support.
In summary, dev_priv->psr.psr2_support means different things at
different points of time. This is still messed up IMHO, we should retain
the comment at the least.
> - if (!dev_priv->psr.psr2_support) {
> - crtc_state->has_psr = true;
> - return;
> - }
psr.psr2_support is set if sink supports psr2, what is the reason to
remove this?
> -
> - /* PSR2 is restricted to work with panel resolutions up to 3640x2304 */
> - if (adjusted_mode->crtc_hdisplay > 3640 ||
> - adjusted_mode->crtc_vdisplay > 2304) {
> - DRM_DEBUG_KMS("PSR2 disabled, panel resolution too big\n");
> - return;
> - }
> -
> - /*
> - * FIXME:enable psr2 only for y-cordinate psr2 panels
> - * After gtc implementation , remove this restriction.
> - */
> - if (!dev_priv->psr.y_cord_support) {
> - DRM_DEBUG_KMS("PSR2 disabled, panel does not support Y
> coordinate\n");
> - return;
> - }
> -
> crtc_state->has_psr = true;
> - crtc_state->has_psr2 = true;
> + crtc_state->has_psr2 = intel_psr2_conditions(intel_dp, crtc_state);
We should debug log whether psr1 or psr2 is being enabled, especially
now that psr1 can be enabled on a psr2 panel.
> }
>
> static void intel_psr_activate(struct intel_dp *intel_dp)
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