drm/msm/dpu: Add interface support for CRC debugfs

Add support for writing CRC values for the interface block to
the debugfs by calling the necessary MISR setup/collect methods.

Changes since V1:
- Set values_cnt to only include phys with backing hw_intf
- Loop over all drm_encs connected to crtc

Changes since V2:
- Remove vblank.h inclusion
- Change `pos + i` to `pos + entries`
- Initialize values_cnt to 0 for encoder
- Change DPU_CRTC_CRC_SOURCE_INTF to DPU_CRTC_CRC_SOURCE_ENCODER (and
  "intf" to "enc")
- Change dpu_encoder_get_num_phys to dpu_encoder_get_num_hw_intfs
- Add checks for setup_misr and collect_misr in
  dpu_encoder_get_num_hw_intfs

Changes since V3:
- Remove extra whitespace
- Change "enc" to "encoder"
- Move crcs array to dpu_crtc_get_encoder_crc
- Rename dpu_encoder_get_num_hw_intfs to dpu_encoder_get_crc_values_cnt
Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/490736/
Link: https://lore.kernel.org/r/20220622171835.7558-5-quic_jesszhan@quicinc.comSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c

@@ -79,6 +79,8 @@ static enum dpu_crtc_crc_source dpu_crtc_parse_crc_source(const char *src_name)
 	if (!strcmp(src_name, "auto") ||
 	    !strcmp(src_name, "lm"))
 		return DPU_CRTC_CRC_SOURCE_LAYER_MIXER;
+	if (!strcmp(src_name, "encoder"))
+		return DPU_CRTC_CRC_SOURCE_ENCODER;
 
 	return DPU_CRTC_CRC_SOURCE_INVALID;
 }
@@ -94,8 +96,16 @@ static int dpu_crtc_verify_crc_source(struct drm_crtc *crtc,
 		return -EINVAL;
 	}
 
-	if (source == DPU_CRTC_CRC_SOURCE_LAYER_MIXER)
+	if (source == DPU_CRTC_CRC_SOURCE_LAYER_MIXER) {
 		*values_cnt = crtc_state->num_mixers;
+	} else if (source == DPU_CRTC_CRC_SOURCE_ENCODER) {
+		struct drm_encoder *drm_enc;
+
+		*values_cnt = 0;
+
+		drm_for_each_encoder_mask(drm_enc, crtc->dev, crtc->state->encoder_mask)
+			*values_cnt += dpu_encoder_get_crc_values_cnt(drm_enc);
+	}
 
 	return 0;
 }
@@ -116,6 +126,14 @@ static void dpu_crtc_setup_lm_misr(struct dpu_crtc_state *crtc_state)
 	}
 }
 
+static void dpu_crtc_setup_encoder_misr(struct drm_crtc *crtc)
+{
+	struct drm_encoder *drm_enc;
+
+	drm_for_each_encoder_mask(drm_enc, crtc->dev, crtc->state->encoder_mask)
+		dpu_encoder_setup_misr(drm_enc);
+}
+
 static int dpu_crtc_set_crc_source(struct drm_crtc *crtc, const char *src_name)
 {
 	enum dpu_crtc_crc_source source = dpu_crtc_parse_crc_source(src_name);
@@ -164,6 +182,8 @@ static int dpu_crtc_set_crc_source(struct drm_crtc *crtc, const char *src_name)
 
 	if (source == DPU_CRTC_CRC_SOURCE_LAYER_MIXER)
 		dpu_crtc_setup_lm_misr(crtc_state);
+	else if (source == DPU_CRTC_CRC_SOURCE_ENCODER)
+		dpu_crtc_setup_encoder_misr(crtc);
 	else
 		ret = -EINVAL;
 
@@ -215,6 +235,28 @@ static int dpu_crtc_get_lm_crc(struct drm_crtc *crtc,
 			drm_crtc_accurate_vblank_count(crtc), crcs);
 }
 
+static int dpu_crtc_get_encoder_crc(struct drm_crtc *crtc)
+{
+	struct drm_encoder *drm_enc;
+	int rc, pos = 0;
+	u32 crcs[INTF_MAX];
+
+	drm_for_each_encoder_mask(drm_enc, crtc->dev, crtc->state->encoder_mask) {
+		rc = dpu_encoder_get_crc(drm_enc, crcs, pos);
+		if (rc < 0) {
+			if (rc != -ENODATA)
+				DRM_DEBUG_DRIVER("MISR read failed\n");
+
+			return rc;
+		}
+
+		pos += rc;
+	}
+
+	return drm_crtc_add_crc_entry(crtc, true,
+			drm_crtc_accurate_vblank_count(crtc), crcs);
+}
+
 static int dpu_crtc_get_crc(struct drm_crtc *crtc)
 {
 	struct dpu_crtc_state *crtc_state = to_dpu_crtc_state(crtc->state);
@@ -227,6 +269,8 @@ static int dpu_crtc_get_crc(struct drm_crtc *crtc)
 
 	if (crtc_state->crc_source == DPU_CRTC_CRC_SOURCE_LAYER_MIXER)
 		return dpu_crtc_get_lm_crc(crtc, crtc_state);
+	else if (crtc_state->crc_source == DPU_CRTC_CRC_SOURCE_ENCODER)
+		return dpu_crtc_get_encoder_crc(crtc);
 
 	return -EINVAL;
 }

drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h

 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
+ * Copyright (c) 2022 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>
@@ -73,11 +74,13 @@ struct dpu_crtc_smmu_state_data {
  * enum dpu_crtc_crc_source: CRC source
  * @DPU_CRTC_CRC_SOURCE_NONE: no source set
  * @DPU_CRTC_CRC_SOURCE_LAYER_MIXER: CRC in layer mixer
+ * @DPU_CRTC_CRC_SOURCE_ENCODER: CRC in encoder
  * @DPU_CRTC_CRC_SOURCE_INVALID: Invalid source
  */
 enum dpu_crtc_crc_source {
 	DPU_CRTC_CRC_SOURCE_NONE = 0,
 	DPU_CRTC_CRC_SOURCE_LAYER_MIXER,
+	DPU_CRTC_CRC_SOURCE_ENCODER,
 	DPU_CRTC_CRC_SOURCE_MAX,
 	DPU_CRTC_CRC_SOURCE_INVALID = -1
 };

drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c

@@ -225,6 +225,70 @@ bool dpu_encoder_is_widebus_enabled(const struct drm_encoder *drm_enc)
 	return dpu_enc->wide_bus_en;
 }
 
+int dpu_encoder_get_crc_values_cnt(const struct drm_encoder *drm_enc)
+{
+	struct dpu_encoder_virt *dpu_enc;
+	int i, num_intf = 0;
+
+	dpu_enc = to_dpu_encoder_virt(drm_enc);
+
+	for (i = 0; i < dpu_enc->num_phys_encs; i++) {
+		struct dpu_encoder_phys *phys = dpu_enc->phys_encs[i];
+
+		if (phys->hw_intf && phys->hw_intf->ops.setup_misr
+				&& phys->hw_intf->ops.collect_misr)
+			num_intf++;
+	}
+
+	return num_intf;
+}
+
+void dpu_encoder_setup_misr(const struct drm_encoder *drm_enc)
+{
+	struct dpu_encoder_virt *dpu_enc;
+
+	int i;
+
+	dpu_enc = to_dpu_encoder_virt(drm_enc);
+
+	for (i = 0; i < dpu_enc->num_phys_encs; i++) {
+		struct dpu_encoder_phys *phys = dpu_enc->phys_encs[i];
+
+		if (!phys->hw_intf || !phys->hw_intf->ops.setup_misr)
+			continue;
+
+		phys->hw_intf->ops.setup_misr(phys->hw_intf, true, 1);
+	}
+}
+
+int dpu_encoder_get_crc(const struct drm_encoder *drm_enc, u32 *crcs, int pos)
+{
+	struct dpu_encoder_virt *dpu_enc;
+
+	int i, rc = 0, entries_added = 0;
+
+	if (!drm_enc->crtc) {
+		DRM_ERROR("no crtc found for encoder %d\n", drm_enc->index);
+		return -EINVAL;
+	}
+
+	dpu_enc = to_dpu_encoder_virt(drm_enc);
+
+	for (i = 0; i < dpu_enc->num_phys_encs; i++) {
+		struct dpu_encoder_phys *phys = dpu_enc->phys_encs[i];
+
+		if (!phys->hw_intf || !phys->hw_intf->ops.collect_misr)
+			continue;
+
+		rc = phys->hw_intf->ops.collect_misr(phys->hw_intf, &crcs[pos + entries_added]);
+		if (rc)
+			return rc;
+		entries_added++;
+	}
+
+	return entries_added;
+}
+
 static void _dpu_encoder_setup_dither(struct dpu_hw_pingpong *hw_pp, unsigned bpc)
 {
 	struct dpu_hw_dither_cfg dither_cfg = { 0 };

drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h

 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
+ * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
  * Copyright (c) 2015-2018, The Linux Foundation. All rights reserved.
  * Copyright (C) 2013 Red Hat
  * Author: Rob Clark <robdclark@gmail.com>
@@ -174,6 +175,27 @@ int dpu_encoder_get_vsync_count(struct drm_encoder *drm_enc);
 
 bool dpu_encoder_is_widebus_enabled(const struct drm_encoder *drm_enc);
 
+/**
+ * dpu_encoder_get_crc_values_cnt - get number of physical encoders contained
+ *	in virtual encoder that can collect CRC values
+ * @drm_enc:    Pointer to previously created drm encoder structure
+ * Returns:     Number of physical encoders for given drm encoder
+ */
+int dpu_encoder_get_crc_values_cnt(const struct drm_encoder *drm_enc);
+
+/**
+ * dpu_encoder_setup_misr - enable misr calculations
+ * @drm_enc:    Pointer to previously created drm encoder structure
+ */
+void dpu_encoder_setup_misr(const struct drm_encoder *drm_encoder);
+
+/**
+ * dpu_encoder_get_crc - get the crc value from interface blocks
+ * @drm_enc:    Pointer to previously created drm encoder structure
+ * Returns:     0 on success, error otherwise
+ */
+int dpu_encoder_get_crc(const struct drm_encoder *drm_enc, u32 *crcs, int pos);
+
 /**
  * dpu_encoder_use_dsc_merge - returns true if the encoder uses DSC merge topology.
  * @drm_enc:    Pointer to previously created drm encoder structure