On Tue, 21 Jun 2022 at 03:50, Jessica Zhang <quic_jesszhan@xxxxxxxxxxx> 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@xxxxxxxxxxx>
> ---
> 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@xxxxxxxxx>
> @@ -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@xxxxxxxxx>
> @@ -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
>
--
With best wishes
Dmitry
