drm/i915/dp: Fix AUX IO power enabling for eDP PSR

[ Upstream commit ec2231b8dd2dc515912ff7816c420153b4a95e92 ]

Panel Self Refresh on eDP requires the AUX IO power to be enabled
whenever the output (main link) is enabled. This is required by the
AUX_PHY_WAKE/ML_PHY_LOCK signaling initiated by the HW automatically to
re-enable the main link after it got disabled in power saving states
(see eDP v1.4b, sections 5.1, 6.1.3.3.1.1).

The Panel Replay mode on non-eDP outputs on the other hand is only
supported by keeping the main link active, thus not requiring the above
AUX_PHY_WAKE/ML_PHY_LOCK signaling (eDP v1.4b, section 6.1.3.3.1.2).
Thus enabling the AUX IO power for this case is not required either.

Based on the above enable the AUX IO power only for eDP/PSR outputs.

Bspec: 49274, 53370

v2:
- Add a TODO comment to adjust the requirement for AUX IO based on
  whether the ALPM/main-link off mode gets enabled. (Rodrigo)

Cc: Animesh Manna <animesh.manna@intel.com>
Fixes: b8cf5b5d266e ("drm/i915/panelreplay: Initializaton and compute config for panel replay")
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240910111847.2995725-1-imre.deak@intel.com
(cherry picked from commit f7c2ed9d4ce80a2570c492825de239dc8b500f2e)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index a07aca96e5517716b4b066ef2200205b524776a7..5b6aabce4c32f55825243fa946b3946588f61cfa 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -916,7 +916,7 @@ intel_ddi_main_link_aux_domain(struct intel_digital_port *dig_port,
         * instead of a specific AUX_IO_<port> reference without powering up any
         * extra wells.
         */
-       if (intel_encoder_can_psr(&dig_port->base))
+       if (intel_psr_needs_aux_io_power(&dig_port->base, crtc_state))
                return intel_display_power_aux_io_domain(i915, dig_port->aux_ch);
        else if (DISPLAY_VER(i915) < 14 &&
                 (intel_crtc_has_dp_encoder(crtc_state) ||

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index d404ad93e91c7f5fe92c7a436428c1861e2b1e2f..da242ba19ed95bdd1b9ff1c18d09243b36ae4b13 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -203,6 +203,25 @@ bool intel_encoder_can_psr(struct intel_encoder *encoder)
                return false;
 }
 
+bool intel_psr_needs_aux_io_power(struct intel_encoder *encoder,
+                                 const struct intel_crtc_state *crtc_state)
+{
+       /*
+        * For PSR/PR modes only eDP requires the AUX IO power to be enabled whenever
+        * the output is enabled. For non-eDP outputs the main link is always
+        * on, hence it doesn't require the HW initiated AUX wake-up signaling used
+        * for eDP.
+        *
+        * TODO:
+        * - Consider leaving AUX IO disabled for eDP / PR as well, in case
+        *   the ALPM with main-link off mode is not enabled.
+        * - Leave AUX IO enabled for DP / PR, once support for ALPM with
+        *   main-link off mode is added for it and this mode gets enabled.
+        */
+       return intel_crtc_has_type(crtc_state, INTEL_OUTPUT_EDP) &&
+              intel_encoder_can_psr(encoder);
+}
+
 static bool psr_global_enabled(struct intel_dp *intel_dp)
 {
        struct intel_connector *connector = intel_dp->attached_connector;

diff --git a/drivers/gpu/drm/i915/display/intel_psr.h b/drivers/gpu/drm/i915/display/intel_psr.h
index d483c85870e1db2e77da54aacc385518aba2eb78..e719f548e1606b959b4524d525eba2a898f138cb 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_psr.h
+++ b/drivers/gpu/drm/i915/display/intel_psr.h
@@ -25,6 +25,8 @@ struct intel_plane_state;
                                    (intel_dp)->psr.source_panel_replay_support)
 
 bool intel_encoder_can_psr(struct intel_encoder *encoder);
+bool intel_psr_needs_aux_io_power(struct intel_encoder *encoder,
+                                 const struct intel_crtc_state *crtc_state);
 void intel_psr_init_dpcd(struct intel_dp *intel_dp);
 void intel_psr_enable_sink(struct intel_dp *intel_dp,
                           const struct intel_crtc_state *crtc_state);