Re: [PATCH v6 09/10] drm/msm/disp/dpu: add PSR support for eDP interface in dpu driver

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On 11/07/2022 15:57, Vinod Polimera wrote:
Enable PSR on eDP interface using drm self-refresh librabry.
This patch uses a trigger from self-refresh library to enter/exit
into PSR, when there are no updates from framework.

Signed-off-by: Kalyan Thota <quic_kalyant@xxxxxxxxxxx>
Signed-off-by: Vinod Polimera <quic_vpolimer@xxxxxxxxxxx>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>

---
  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c    | 13 ++++++++++++-
  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 14 ++++++++++++++
  drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c     |  2 +-
  3 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index f91e3d1..eb3915a 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -18,6 +18,7 @@
  #include <drm/drm_probe_helper.h>
  #include <drm/drm_rect.h>
  #include <drm/drm_vblank.h>
+#include <drm/drm_self_refresh_helper.h>
#include "dpu_kms.h"
  #include "dpu_hw_lm.h"
@@ -961,6 +962,9 @@ static void dpu_crtc_disable(struct drm_crtc *crtc,
DRM_DEBUG_KMS("crtc%d\n", crtc->base.id); + if (old_crtc_state->self_refresh_active)
+		return;
+
  	/* Disable/save vblank irq handling */
  	drm_crtc_vblank_off(crtc);
@@ -1521,7 +1525,7 @@ struct drm_crtc *dpu_crtc_init(struct drm_device *dev, struct drm_plane *plane,
  {
  	struct drm_crtc *crtc = NULL;
  	struct dpu_crtc *dpu_crtc = NULL;
-	int i;
+	int i, ret;
dpu_crtc = kzalloc(sizeof(*dpu_crtc), GFP_KERNEL);
  	if (!dpu_crtc)
@@ -1558,6 +1562,13 @@ struct drm_crtc *dpu_crtc_init(struct drm_device *dev, struct drm_plane *plane,
  	/* initialize event handling */
  	spin_lock_init(&dpu_crtc->event_lock);
+ ret = drm_self_refresh_helper_init(crtc);
+	if (ret) {
+		DPU_ERROR("Failed to initialize %s with self-refresh helpers %d\n",
+			crtc->name, ret);
+		return ERR_PTR(ret);
+	}
+
  	DRM_DEBUG_KMS("%s: successfully initialized crtc\n", dpu_crtc->name);
  	return crtc;
  }
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 3156efb..5dfb56a 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -12,6 +12,7 @@
  #include <linux/kthread.h>
  #include <linux/seq_file.h>
+#include <drm/drm_atomic.h>
  #include <drm/drm_crtc.h>
  #include <drm/drm_file.h>
  #include <drm/drm_probe_helper.h>
@@ -1170,11 +1171,24 @@ static void dpu_encoder_virt_atomic_disable(struct drm_encoder *drm_enc,
  					struct drm_atomic_state *state)
  {
  	struct dpu_encoder_virt *dpu_enc = NULL;
+	struct drm_crtc *crtc;
+	struct drm_crtc_state *old_state = NULL;
  	int i = 0;
dpu_enc = to_dpu_encoder_virt(drm_enc);
  	DPU_DEBUG_ENC(dpu_enc, "\n");
+ crtc = drm_atomic_get_old_crtc_for_encoder(state, drm_enc);
+	if (crtc)
+		old_state = drm_atomic_get_old_crtc_state(state, crtc);
+
+	/*
+	 * The encoder is already disabled if self refresh mode was set earlier,
+	 * in the old_state for the corresponding crtc.
+	 */
+	if (old_state && old_state->self_refresh_active)
+		return;
+
  	mutex_lock(&dpu_enc->enc_lock);
  	dpu_enc->enabled = false;
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index bce4764..cc0a674 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -507,7 +507,7 @@ static void dpu_kms_wait_for_commit_done(struct msm_kms *kms,
  		return;
  	}
- if (!crtc->state->active) {
+	if (!drm_atomic_crtc_effectively_active(crtc->state)) {
  		DPU_DEBUG("[crtc:%d] not active\n", crtc->base.id);
  		return;
  	}


--
With best wishes
Dmitry



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