disp: msm: sde: reset mixers in crtc when ctl datapath switches

This change reinitializes the sde_crtc->mixers when CTL
datapath switch occurs during mode set and RM allocation
of CTL hw block is changed. This initialization is required
for CTL_LAYER programming to trigger on the new CTL allocated
from RM.

Issue case:
1. Primary Display is using CTL_0 and it is reserved.
2. Secondary Display is using CTL_1. On suspend, RM adds
   CTL_1 into the free list.
3. External Display is powered on, RM allocates CTL_1 hw blk.
4. Secondary Display is powered on, RM allocated CTL_2 hw blk.
5. External Display is suspended/unplugged, RM adds CTL_1 into
   the free list.
6. When any mode_set(say fps switch) occurs on secondary, RM
   allocates new resources and CTL_1 is allocated.

sde_crtc->num_mixers is non zero, so all the layer programming
happens on CTL_2, but CTL_1_FLUSH bits are programmed causing
hw timeout issue.

Change-Id: I5f1f52b7673740c48b249ab4d36e80b7a1d3db96
Signed-off-by: Jayaprakash Madisetty <quic_jmadiset@quicinc.com>

msm/sde/sde_crtc.c

@@ -1,4 +1,5 @@
 /*
+ * Copyright (c) 2021 Qualcomm Innovation Center, Inc. All rights reserved.
  * Copyright (c) 2014-2021 The Linux Foundation. All rights reserved.
  * Copyright (C) 2013 Red Hat
  * Author: Rob Clark <robdclark@gmail.com>
@@ -3578,6 +3579,9 @@ static void sde_crtc_atomic_begin(struct drm_crtc *crtc,
 		_sde_crtc_setup_is_ppsplit(crtc->state);
 		_sde_crtc_setup_lm_bounds(crtc, crtc->state);
 		_sde_crtc_clear_all_blend_stages(sde_crtc);
+	} else if (sde_crtc->num_mixers && sde_crtc->reinit_crtc_mixers) {
+		_sde_crtc_setup_mixers(crtc);
+		sde_crtc->reinit_crtc_mixers = false;
 	}
 
 	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {

msm/sde/sde_crtc.h

@@ -1,4 +1,5 @@
 /*
+ * Copyright (c) 2021 Qualcomm Innovation Center, Inc. All rights reserved.
  * Copyright (c) 2015-2021 The Linux Foundation. All rights reserved.
  * Copyright (C) 2013 Red Hat
  * Author: Rob Clark <robdclark@gmail.com>
@@ -316,6 +317,7 @@ struct sde_frame_data {
  * @ltm_buffer_lock : muttx to protect ltm_buffers allcation and free
  * @ltm_lock        : Spinlock to protect ltm buffer_cnt, hist_en and ltm lists
  * @needs_hw_reset  : Initiate a hw ctl reset
+ * @reinit_crtc_mixers : Reinitialize mixers in crtc
  * @hist_irq_idx    : hist interrupt irq idx
  * @disable_pending_cp : flag tracks pending color processing features force disable
  * @src_bpp         : source bpp used to calculate compression ratio
@@ -415,6 +417,7 @@ struct sde_crtc {
 	struct mutex ltm_buffer_lock;
 	spinlock_t ltm_lock;
 	bool needs_hw_reset;
+	bool reinit_crtc_mixers;
 	int hist_irq_idx;
 	bool disable_pending_cp;
 

msm/sde/sde_encoder.c

@@ -1,4 +1,5 @@
 /*
+ * Copyright (c) 2021 Qualcomm Innovation Center, Inc. All rights reserved.
  * Copyright (c) 2014-2021, The Linux Foundation. All rights reserved.
  * Copyright (C) 2013 Red Hat
  * Author: Rob Clark <robdclark@gmail.com>
@@ -2487,6 +2488,7 @@ static void sde_encoder_virt_mode_set(struct drm_encoder *drm_enc,
 	struct drm_connector *conn;
 	struct sde_connector_state *c_state;
 	struct msm_display_mode *msm_mode;
+	struct sde_crtc *sde_crtc;
 	int i = 0, ret;
 	int num_lm, num_intf, num_pp_per_intf;
 
@@ -2518,6 +2520,7 @@ static void sde_encoder_virt_mode_set(struct drm_encoder *drm_enc,
 	}
 
 	sde_enc->crtc = drm_enc->crtc;
+	sde_crtc = to_sde_crtc(drm_enc->crtc);
 	sde_crtc_set_qos_dirty(drm_enc->crtc);
 
 	/* get and store the mode_info */
@@ -2577,7 +2580,8 @@ static void sde_encoder_virt_mode_set(struct drm_encoder *drm_enc,
 			phys->hw_pp = sde_enc->hw_pp[i * num_pp_per_intf];
 			phys->connector = conn;
 			if (phys->ops.mode_set)
-				phys->ops.mode_set(phys, mode, adj_mode);
+				phys->ops.mode_set(phys, mode, adj_mode,
+				&sde_crtc->reinit_crtc_mixers);
 		}
 	}
 

msm/sde/sde_encoder_phys.h

@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
+ * Copyright (c) 2021 Qualcomm Innovation Center, Inc. All rights reserved.
  * Copyright (c) 2015-2021, The Linux Foundation. All rights reserved.
  */
 
@@ -146,7 +147,7 @@ struct sde_encoder_phys_ops {
 			struct drm_display_mode *adjusted_mode);
 	void (*mode_set)(struct sde_encoder_phys *encoder,
 			struct drm_display_mode *mode,
-			struct drm_display_mode *adjusted_mode);
+			struct drm_display_mode *adjusted_mode, bool *reinit_mixers);
 	void (*cont_splash_mode_set)(struct sde_encoder_phys *encoder,
 			struct drm_display_mode *adjusted_mode);
 	void (*enable)(struct sde_encoder_phys *encoder);

msm/sde/sde_encoder_phys_cmd.c

@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
+ * Copyright (c) 2021 Qualcomm Innovation Center, Inc. All rights reserved.
  * Copyright (c) 2015-2021, The Linux Foundation. All rights reserved.
  */
 
@@ -406,7 +407,7 @@ static void sde_encoder_phys_cmd_cont_splash_mode_set(
 static void sde_encoder_phys_cmd_mode_set(
 		struct sde_encoder_phys *phys_enc,
 		struct drm_display_mode *mode,
-		struct drm_display_mode *adj_mode)
+		struct drm_display_mode *adj_mode, bool *reinit_mixers)
 {
 	struct sde_encoder_phys_cmd *cmd_enc =
 		to_sde_encoder_phys_cmd(phys_enc);
@@ -427,9 +428,15 @@ static void sde_encoder_phys_cmd_mode_set(
 	/* Retrieve previously allocated HW Resources. Shouldn't fail */
 	sde_rm_init_hw_iter(&iter, phys_enc->parent->base.id, SDE_HW_BLK_CTL);
 	for (i = 0; i <= instance; i++) {
-		if (sde_rm_get_hw(rm, &iter))
+		if (sde_rm_get_hw(rm, &iter)) {
+			if (phys_enc->hw_ctl && phys_enc->hw_ctl != iter.hw) {
+				*reinit_mixers =  true;
+				SDE_EVT32(phys_enc->hw_ctl->idx,
+					((struct sde_hw_ctl *)iter.hw)->idx);
+			}
 			phys_enc->hw_ctl = (struct sde_hw_ctl *)iter.hw;
 		}
+	}
 
 	if (IS_ERR_OR_NULL(phys_enc->hw_ctl)) {
 		SDE_ERROR_CMDENC(cmd_enc, "failed to init ctl: %ld\n",

msm/sde/sde_encoder_phys_vid.c

@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
+ * Copyright (c) 2021 Qualcomm Innovation Center, Inc. All rights reserved.
  * Copyright (c) 2015-2021, The Linux Foundation. All rights reserved.
  */
 
@@ -606,7 +607,7 @@ static void sde_encoder_phys_vid_cont_splash_mode_set(
 static void sde_encoder_phys_vid_mode_set(
 		struct sde_encoder_phys *phys_enc,
 		struct drm_display_mode *mode,
-		struct drm_display_mode *adj_mode)
+		struct drm_display_mode *adj_mode, bool *reinit_mixers)
 {
 	struct sde_rm *rm;
 	struct sde_rm_hw_iter iter;
@@ -632,9 +633,15 @@ static void sde_encoder_phys_vid_mode_set(
 	/* Retrieve previously allocated HW Resources. Shouldn't fail */
 	sde_rm_init_hw_iter(&iter, phys_enc->parent->base.id, SDE_HW_BLK_CTL);
 	for (i = 0; i <= instance; i++) {
-		if (sde_rm_get_hw(rm, &iter))
+		if (sde_rm_get_hw(rm, &iter)) {
+			if (phys_enc->hw_ctl && phys_enc->hw_ctl != iter.hw) {
+				*reinit_mixers =  true;
+				SDE_EVT32(phys_enc->hw_ctl->idx,
+					((struct sde_hw_ctl *)iter.hw)->idx);
+			}
 			phys_enc->hw_ctl = (struct sde_hw_ctl *)iter.hw;
 		}
+	}
 	if (IS_ERR_OR_NULL(phys_enc->hw_ctl)) {
 		SDE_ERROR_VIDENC(vid_enc, "failed to init ctl, %ld\n",
 				PTR_ERR(phys_enc->hw_ctl));

msm/sde/sde_encoder_phys_wb.c

@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
+ * Copyright (c) 2021 Qualcomm Innovation Center, Inc. All rights reserved.
  * Copyright (c) 2015-2021, The Linux Foundation. All rights reserved.
  */
 
@@ -1355,7 +1356,7 @@ static void sde_encoder_phys_wb_irq_ctrl(
 static void sde_encoder_phys_wb_mode_set(
 		struct sde_encoder_phys *phys_enc,
 		struct drm_display_mode *mode,
-		struct drm_display_mode *adj_mode)
+		struct drm_display_mode *adj_mode, bool *reinit_mixers)
 {
 	struct sde_encoder_phys_wb *wb_enc = to_sde_encoder_phys_wb(phys_enc);
 	struct sde_rm *rm = &phys_enc->sde_kms->rm;
@@ -1377,9 +1378,15 @@ static void sde_encoder_phys_wb_mode_set(
 	sde_rm_init_hw_iter(&iter, phys_enc->parent->base.id, SDE_HW_BLK_CTL);
 	for (i = 0; i <= instance; i++) {
 		sde_rm_get_hw(rm, &iter);
-		if (i == instance)
+		if (i == instance) {
+			if (phys_enc->hw_ctl && phys_enc->hw_ctl != iter.hw) {
+				*reinit_mixers =  true;
+				SDE_EVT32(phys_enc->hw_ctl->idx,
+					((struct sde_hw_ctl *)iter.hw)->idx);
+			}
 			phys_enc->hw_ctl = (struct sde_hw_ctl *) iter.hw;
 		}
+	}
 
 	if (IS_ERR_OR_NULL(phys_enc->hw_ctl)) {
 		SDE_ERROR("failed init ctl: %ld\n",