Re: [PATCH v3 4/4] drm/msm/dpu: Add interface support for CRC debugfs

On Tue, 21 Jun 2022 at 03:50, Jessica Zhang quic_jesszhan@quicinc.com wrote:

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

Signed-off-by: Jessica Zhang quic_jesszhan@quicinc.com

drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 50 +++++++++++++++- drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h | 3 + drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 64 +++++++++++++++++++++ drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h | 22 +++++++ 4 files changed, 138 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c index 69a1257d3b6d..b4e8a4432796 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c +++ b/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, "enc"))
  

"encoder" unless you have any strong reason (like being compatible with other platforms).

•           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_num_hw_intfs(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;
  
  

@@ -212,6 +232,28 @@ 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, u32 *crcs) +{

•   struct drm_encoder *drm_enc;
  

•   int rc, pos = 0;
  

Extra empty line.

•   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); @@ -226,6 +268,12 @@ static int dpu_crtc_get_crc(struct drm_crtc *crtc) if (crtc_state->crc_source == DPU_CRTC_CRC_SOURCE_LAYER_MIXER) { BUILD_BUG_ON(ARRAY_SIZE(crcs) < ARRAY_SIZE(crtc_state->mixers)); return dpu_crtc_get_lm_crc(crtc, crtc_state, crcs);

•   } else if (crtc_state->crc_source == DPU_CRTC_CRC_SOURCE_ENCODER) {
  

•           if (ARRAY_SIZE(crcs) < INTF_MAX)
  

•                   DPU_ERROR("crcs array of size %ld less than %d\n",
  

•                                   ARRAY_SIZE(crcs), INTF_MAX);
  

Ok. With the crcs array being local you don't have to preallocate it here and pass it as an argument. Just declare it in the dpu_crtc_get_encoder_crc(). Then you can allocate it as `u32 crcs[INTF_MAX]` and remove the check.

•           return dpu_crtc_get_encoder_crc(crtc, crcs);
    }
  
    return 0;
  

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h index aa897ec28ad3..b49cf8ae126f 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.h @@ -1,5 +1,6 @@ /* 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

@@ -78,11 +79,13 @@ 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
  

}; diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c index 52516eb20cb8..a8f841180383 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c +++ b/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_num_hw_intfs(const struct drm_encoder *drm_enc)

dpu_encoder_get_crc_values_cnt(), please.

+{

•   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 }; diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h index 781d41c91994..749e0144d2de 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h @@ -1,5 +1,6 @@ /* 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_num_hw_intfs - get number of physical encoders contained

• • in virtual encoder
    

• • @drm_enc: Pointer to previously created drm encoder structure
• • Returns: Number of physical encoders for given drm encoder
• */

+int dpu_encoder_get_num_hw_intfs(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

-- 2.35.1