Re: [PATCH v4 1/4] drm/msm/dpu: Move LM CRC code into separate method

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On 22/06/2022 20:18, Jessica Zhang wrote:
Move layer mixer-specific section of dpu_crtc_get_crc() into a separate
helper method. This way, we can make it easier to get CRCs from other HW
blocks by adding other get_crc helper methods.

Changes since V1:
- Move common bitmasks to dpu_hw_util.h
- Move common CRC methods to dpu_hw_util.c
- Update copyrights
- Change crcs array to a dynamically allocated array and added it as a
   member of crtc_state

Changes since V2:
- Put changes for hw_util into a separate commit
- Revert crcs array to a static array
- Add else case for set_crc_source to return EINVAL if no valid source
   is selected
- Add DPU_CRTC_MAX_CRC_ENTRIES macro

Changes since V3:
- Move crcs array into dpu_crtc_get_lm_crc
- Remove comment about crcs array in dpu_crtc_state struct
- Revert `lm` rename
- Remove DPU_CRTC_MAX_CRC_ENTRIES macro
- Return EINVAL in dpu_crtc_get_crc if no valid CRC source is set

Signed-off-by: Jessica Zhang <quic_jesszhan@xxxxxxxxxxx>

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

---
  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 65 +++++++++++++++---------
  drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h |  2 +
  2 files changed, 43 insertions(+), 24 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
index b56f777dbd0e..b57140c3671a 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
@@ -1,5 +1,6 @@
  // SPDX-License-Identifier: GPL-2.0-only
  /*
+ * Copyright (c) 2022 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@xxxxxxxxx>
@@ -99,17 +100,32 @@ static int dpu_crtc_verify_crc_source(struct drm_crtc *crtc,
  	return 0;
  }
+static void dpu_crtc_setup_lm_misr(struct dpu_crtc_state *crtc_state)
+{
+	struct dpu_crtc_mixer *m;
+	int i;
+
+	for (i = 0; i < crtc_state->num_mixers; ++i) {
+		m = &crtc_state->mixers[i];
+
+		if (!m->hw_lm || !m->hw_lm->ops.setup_misr)
+			continue;
+
+		/* Calculate MISR over 1 frame */
+		m->hw_lm->ops.setup_misr(m->hw_lm, true, 1);
+	}
+}
+
  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);
  	enum dpu_crtc_crc_source current_source;
  	struct dpu_crtc_state *crtc_state;
  	struct drm_device *drm_dev = crtc->dev;
-	struct dpu_crtc_mixer *m;
bool was_enabled;
  	bool enable = false;
-	int i, ret = 0;
+	int ret = 0;
if (source < 0) {
  		DRM_DEBUG_DRIVER("Invalid CRC source %s for CRTC%d\n", src_name, crtc->index);
@@ -146,16 +162,10 @@ static int dpu_crtc_set_crc_source(struct drm_crtc *crtc, const char *src_name)
crtc_state->crc_frame_skip_count = 0; - for (i = 0; i < crtc_state->num_mixers; ++i) {
-		m = &crtc_state->mixers[i];
-
-		if (!m->hw_lm || !m->hw_lm->ops.setup_misr)
-			continue;
-
-		/* Calculate MISR over 1 frame */
-		m->hw_lm->ops.setup_misr(m->hw_lm, true, 1);
-	}
-
+	if (source == DPU_CRTC_CRC_SOURCE_LAYER_MIXER)
+		dpu_crtc_setup_lm_misr(crtc_state);
+	else
+		ret = -EINVAL;
cleanup:
  	drm_modeset_unlock(&crtc->mutex);
@@ -174,26 +184,17 @@ static u32 dpu_crtc_get_vblank_counter(struct drm_crtc *crtc)
  	return dpu_encoder_get_vsync_count(encoder);
  }
-
-static int dpu_crtc_get_crc(struct drm_crtc *crtc)
+static int dpu_crtc_get_lm_crc(struct drm_crtc *crtc,
+		struct dpu_crtc_state *crtc_state)
  {
-	struct dpu_crtc_state *crtc_state;
  	struct dpu_crtc_mixer *m;
  	u32 crcs[CRTC_DUAL_MIXERS];
- int i = 0;
  	int rc = 0;
-
-	crtc_state = to_dpu_crtc_state(crtc->state);
+	int i;
BUILD_BUG_ON(ARRAY_SIZE(crcs) != ARRAY_SIZE(crtc_state->mixers)); - /* Skip first 2 frames in case of "uncooked" CRCs */
-	if (crtc_state->crc_frame_skip_count < 2) {
-		crtc_state->crc_frame_skip_count++;
-		return 0;
-	}
-
  	for (i = 0; i < crtc_state->num_mixers; ++i) {
m = &crtc_state->mixers[i];
@@ -214,6 +215,22 @@ static int dpu_crtc_get_crc(struct drm_crtc *crtc)
  			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);
+
+	/* Skip first 2 frames in case of "uncooked" CRCs */
+	if (crtc_state->crc_frame_skip_count < 2) {
+		crtc_state->crc_frame_skip_count++;
+		return 0;
+	}
+
+	if (crtc_state->crc_source == DPU_CRTC_CRC_SOURCE_LAYER_MIXER)
+		return dpu_crtc_get_lm_crc(crtc, crtc_state);
+
+	return -EINVAL;
+}
+
  static bool dpu_crtc_get_scanout_position(struct drm_crtc *crtc,
  					   bool in_vblank_irq,
  					   int *vpos, int *hpos,
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
index b8785c394fcc..20df23fe74ed 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h
@@ -201,6 +201,8 @@ struct dpu_crtc {
   * @mixers        : List of active mixers
   * @num_ctls      : Number of ctl paths in use
   * @hw_ctls       : List of active ctl paths
+ * @crc_source    : CRC source
+ * @crc_frame_skip_count: Number of frames skipped before getting CRC
   */
  struct dpu_crtc_state {
  	struct drm_crtc_state base;


--
With best wishes
Dmitry



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