[Intel-gfx] [PATCH v2] drm/i915/psr: Force PSR probe only after full initialization

["José Roberto de Souza" <jose.souza@intel.com>]

Commit 60c6a14b489b ("drm/i915/display: Force the state compute phase
once to enable PSR") was forcing the state compute too earlier
causing errors because not everything was initialized, so here
moving to i915_driver_register() when everything is ready and driver
is registering into the rest of the system.

Also fixing the place where it disarm the force probe as during the
atomic check phase errors could happen like the ones due locking and
it would cause PSR to never be enabled if that happens.
Leaving the disarm to the atomic commit phase, intel_psr_enable() or
intel_psr_update() will be called even if the current state do not
allow PSR to be enabled.

v2: Check if intel_dp is null in intel_psr_force_mode_changed_set()

Fixes: 60c6a14b489b ("drm/i915/display: Force the state compute phase once to enable PSR")
Closes: https://gitlab.freedesktop.org/drm/intel/issues/1151
Reported-by: Ross Zwisler <zwisler@google.com>
Cc: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
---
 drivers/gpu/drm/i915/display/intel_psr.c | 18 ++++++++++++++++--
 drivers/gpu/drm/i915/display/intel_psr.h |  1 +
 drivers/gpu/drm/i915/i915_drv.c          |  3 +++
 drivers/gpu/drm/i915/i915_drv.h          |  2 +-
 4 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index b4942b6445ae..35bafd281deb 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -936,6 +936,8 @@ void intel_psr_enable(struct intel_dp *intel_dp,
 {
 	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 
+	intel_psr_force_mode_changed_set(intel_dp, false);
+
 	if (!crtc_state->has_psr)
 		return;
 
@@ -1096,6 +1098,8 @@ void intel_psr_update(struct intel_dp *intel_dp,
 	struct i915_psr *psr = &dev_priv->psr;
 	bool enable, psr2_enable;
 
+	intel_psr_force_mode_changed_set(intel_dp, false);
+
 	if (!CAN_PSR(dev_priv) || READ_ONCE(psr->dp) != intel_dp)
 		return;
 
@@ -1629,7 +1633,7 @@ void intel_psr_atomic_check(struct drm_connector *connector,
 	struct drm_crtc_state *crtc_state;
 
 	if (!CAN_PSR(dev_priv) || !new_state->crtc ||
-	    dev_priv->psr.initially_probed)
+	    !dev_priv->psr.force_mode_changed)
 		return;
 
 	intel_connector = to_intel_connector(connector);
@@ -1640,5 +1644,15 @@ void intel_psr_atomic_check(struct drm_connector *connector,
 	crtc_state = drm_atomic_get_new_crtc_state(new_state->state,
 						   new_state->crtc);
 	crtc_state->mode_changed = true;
-	dev_priv->psr.initially_probed = true;
+}
+
+void intel_psr_force_mode_changed_set(struct intel_dp *intel_dp, bool set)
+{
+	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
+
+	if (!CAN_PSR(dev_priv) || !intel_dp || !intel_dp_is_edp(intel_dp) ||
+	    intel_dp != dev_priv->psr.dp)
+		return;
+
+	dev_priv->psr.force_mode_changed = set;
 }
diff --git a/drivers/gpu/drm/i915/display/intel_psr.h b/drivers/gpu/drm/i915/display/intel_psr.h
index c58a1d438808..27a70468e2b9 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.h
+++ b/drivers/gpu/drm/i915/display/intel_psr.h
@@ -40,5 +40,6 @@ bool intel_psr_enabled(struct intel_dp *intel_dp);
 void intel_psr_atomic_check(struct drm_connector *connector,
 			    struct drm_connector_state *old_state,
 			    struct drm_connector_state *new_state);
+void intel_psr_force_mode_changed_set(struct intel_dp *intel_dp, bool set);
 
 #endif /* __INTEL_PSR_H__ */
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 72826e36b165..31fbd034ff82 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -56,6 +56,7 @@
 #include "display/intel_hotplug.h"
 #include "display/intel_overlay.h"
 #include "display/intel_pipe_crc.h"
+#include "display/intel_psr.h"
 #include "display/intel_sprite.h"
 #include "display/intel_vga.h"
 
@@ -1348,6 +1349,8 @@ static void i915_driver_register(struct drm_i915_private *dev_priv)
 
 	intel_audio_init(dev_priv);
 
+	intel_psr_force_mode_changed_set(dev_priv->psr.dp, true);
+
 	/*
 	 * Some ports require correctly set-up hpd registers for detection to
 	 * work properly (leading to ghost connected connector status), e.g. VGA
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index da509d9b8895..773f35015174 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -505,7 +505,7 @@ struct i915_psr {
 	bool dc3co_enabled;
 	u32 dc3co_exit_delay;
 	struct delayed_work dc3co_work;
-	bool initially_probed;
+	bool force_mode_changed;
 };
 
 #define QUIRK_LVDS_SSC_DISABLE (1<<1)
-- 
2.25.0

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