Add support for RM to reserve dedicated CWB pingpongs and CWB muxes
For concurrent writeback, even-indexed CWB muxes must be assigned to
even-indexed LMs and odd-indexed CWB muxes for odd-indexed LMs. The same
even/odd rule applies for dedicated CWB pingpongs.
Track the CWB muxes in the global state and add a CWB-specific helper to
reserve the correct CWB muxes and dedicated pingpongs following the
even/odd rule.
Signed-off-by: Jessica Zhang <quic_jesszhan@xxxxxxxxxxx>
---
drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 34 ++++++++++--
drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h | 2 +
drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h | 1 +
drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c | 84 +++++++++++++++++++++++++++++
4 files changed, 117 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 36b677cf9c7a..b2f0bf412451 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -2,7 +2,7 @@
/*
* Copyright (C) 2013 Red Hat
* Copyright (c) 2014-2018, 2020-2021 The Linux Foundation. All rights reserved.
- * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
*
* Author: Rob Clark <robdclark@xxxxxxxxx>
*/
@@ -28,6 +28,7 @@
#include "dpu_hw_dsc.h"
#include "dpu_hw_merge3d.h"
#include "dpu_hw_cdm.h"
+#include "dpu_hw_cwb.h"
#include "dpu_formats.h"
#include "dpu_encoder_phys.h"
#include "dpu_crtc.h"
@@ -133,6 +134,9 @@ enum dpu_enc_rc_states {
* @cur_slave: As above but for the slave encoder.
* @hw_pp: Handle to the pingpong blocks used for the display. No.
* pingpong blocks can be different than num_phys_encs.
+ * @hw_cwb: Handle to the CWB muxes used for concurrent writeback
+ * display. Number of CWB muxes can be different than
+ * num_phys_encs.
* @hw_dsc: Handle to the DSC blocks used for the display.
* @dsc_mask: Bitmask of used DSC blocks.
* @intfs_swapped: Whether or not the phys_enc interfaces have been swapped
@@ -177,6 +181,7 @@ struct dpu_encoder_virt {
struct dpu_encoder_phys *cur_master;
struct dpu_encoder_phys *cur_slave;
struct dpu_hw_pingpong *hw_pp[MAX_CHANNELS_PER_ENC];
+ struct dpu_hw_cwb *hw_cwb[MAX_CHANNELS_PER_ENC];
struct dpu_hw_dsc *hw_dsc[MAX_CHANNELS_PER_ENC];
unsigned int dsc_mask;
@@ -1053,7 +1058,10 @@ static void dpu_encoder_virt_atomic_mode_set(struct drm_encoder *drm_enc,
struct dpu_hw_blk *hw_pp[MAX_CHANNELS_PER_ENC];
struct dpu_hw_blk *hw_ctl[MAX_CHANNELS_PER_ENC];
struct dpu_hw_blk *hw_dsc[MAX_CHANNELS_PER_ENC];
+ struct dpu_hw_blk *hw_cwb[MAX_CHANNELS_PER_ENC];
int num_pp, num_dsc;
+ int num_cwb = 0;
+ bool is_cwb_encoder;
unsigned int dsc_mask = 0;
int i;
@@ -1067,6 +1075,8 @@ static void dpu_encoder_virt_atomic_mode_set(struct drm_encoder *drm_enc,
priv = drm_enc->dev->dev_private;
dpu_kms = to_dpu_kms(priv->kms);
+ is_cwb_encoder = drm_crtc_in_clone_mode(crtc_state) &&
+ dpu_enc->disp_info.intf_type == INTF_WB;
global_state = dpu_kms_get_existing_global_state(dpu_kms);
if (IS_ERR_OR_NULL(global_state)) {
@@ -1077,9 +1087,25 @@ static void dpu_encoder_virt_atomic_mode_set(struct drm_encoder *drm_enc,
trace_dpu_enc_mode_set(DRMID(drm_enc));
/* Query resource that have been reserved in atomic check step. */
- num_pp = dpu_rm_get_assigned_resources(&dpu_kms->rm, global_state,
- drm_enc->crtc, DPU_HW_BLK_PINGPONG, hw_pp,
- ARRAY_SIZE(hw_pp));
+ if (is_cwb_encoder) {
+ num_pp = dpu_rm_get_assigned_resources(&dpu_kms->rm, global_state,
+ drm_enc->crtc,
+ DPU_HW_BLK_DCWB_PINGPONG,
+ hw_pp, ARRAY_SIZE(hw_pp));
+ num_cwb = dpu_rm_get_assigned_resources(&dpu_kms->rm, global_state,
+ drm_enc->crtc,
+ DPU_HW_BLK_CWB,
+ hw_cwb, ARRAY_SIZE(hw_cwb));
+ } else {
+ num_pp = dpu_rm_get_assigned_resources(&dpu_kms->rm, global_state,
+ drm_enc->crtc,
+ DPU_HW_BLK_PINGPONG, hw_pp,
+ ARRAY_SIZE(hw_pp));
+ }
+
+ for (i = 0; i < num_cwb; i++)
+ dpu_enc->hw_cwb[i] = to_dpu_hw_cwb(hw_cwb[i]);
+
dpu_rm_get_assigned_resources(&dpu_kms->rm, global_state,
drm_enc->crtc, DPU_HW_BLK_CTL, hw_ctl, ARRAY_SIZE(hw_ctl));
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
index c43cb55fe1d2..34195bf4e270 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
@@ -77,12 +77,14 @@ enum dpu_hw_blk_type {
DPU_HW_BLK_LM,
DPU_HW_BLK_CTL,
DPU_HW_BLK_PINGPONG,
+ DPU_HW_BLK_DCWB_PINGPONG,
DPU_HW_BLK_INTF,
DPU_HW_BLK_WB,
DPU_HW_BLK_DSPP,
DPU_HW_BLK_MERGE_3D,
DPU_HW_BLK_DSC,
DPU_HW_BLK_CDM,
+ DPU_HW_BLK_CWB,
DPU_HW_BLK_MAX,
};
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
index 4fdc5f933261..a078b5334dc1 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h
@@ -128,6 +128,7 @@ struct dpu_global_state {
uint32_t dspp_to_crtc_id[DSPP_MAX - DSPP_0];
uint32_t dsc_to_crtc_id[DSC_MAX - DSC_0];
uint32_t cdm_to_crtc_id;
+ uint32_t cwb_to_crtc_id[CWB_MAX - CWB_0];
};
struct dpu_global_state
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
index 04df3056d75a..429e432e2163 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
@@ -223,6 +223,54 @@ static int _dpu_rm_get_lm_peer(struct dpu_rm *rm, int primary_idx)
return -EINVAL;
}
+static int _dpu_rm_reserve_cwb_mux_and_pingpongs(struct dpu_rm *rm,
+ struct dpu_global_state *global_state,
+ uint32_t crtc_id,
+ struct msm_display_topology *topology)
+{
+ int num_cwb_pp = topology->num_lm, cwb_pp_count = 0;
+ int cwb_pp_start_idx = PINGPONG_CWB_0 - PINGPONG_0;
+ int cwb_pp_idx[MAX_BLOCKS];
+ int cwb_mux_idx[MAX_BLOCKS];
+
+ /*
+ * Reserve additional dedicated CWB pingpong blocks and muxes for each
+ * mixer
+ *
+ * TODO: add support for reserving non-dedicated CWB pingpong blocks
+ */
+ for (int i = 0; i < ARRAY_SIZE(rm->mixer_blks) &&
+ cwb_pp_count < num_cwb_pp; i++) {
+ for (int j = cwb_pp_start_idx;
+ j < ARRAY_SIZE(rm->pingpong_blks); j++) {
+ /*
+ * Odd LMs must be assigned to odd pingpongs and even
+ * LMs with even pingpongs
+ */
+ if (reserved_by_other(global_state->pingpong_to_crtc_id,
+ j, crtc_id) || i % 2 != j % 2)
+ continue;
+
+ cwb_pp_idx[cwb_pp_count] = j;
+ cwb_mux_idx[cwb_pp_count] = j - cwb_pp_start_idx;
+ cwb_pp_count++;
+ break;
+ }
+ }
+
+ if (cwb_pp_count != num_cwb_pp) {
+ DPU_ERROR("Unable to reserve all cwb pingpongs\n");
+ return -ENAVAIL;
+ }
+
+ for (int i = 0; i < cwb_pp_count; i++) {
+ global_state->pingpong_to_crtc_id[cwb_pp_idx[i]] = crtc_id;
+ global_state->cwb_to_crtc_id[cwb_mux_idx[i]] = crtc_id;
+ }
+
+ return 0;
+}
+
/**
* _dpu_rm_check_lm_and_get_connected_blks - check if proposed layer mixer meets
* proposed use case requirements, incl. hardwired dependent blocks like
@@ -603,6 +651,14 @@ static int _dpu_rm_make_reservation(
return ret;
}
+ if (topology->cwb_enabled) {
+ ret = _dpu_rm_reserve_cwb_mux_and_pingpongs(rm, global_state,
+ crtc_id, topology);
+ if (ret) {
+ DPU_ERROR("unable to find appropriate dcwb pingpongs\n");
+ return ret;
+ }
+ }
ret = _dpu_rm_reserve_ctls(rm, global_state, crtc_id,
topology);
@@ -653,6 +709,8 @@ void dpu_rm_release(struct dpu_global_state *global_state,
_dpu_rm_clear_mapping(global_state->dspp_to_crtc_id,
ARRAY_SIZE(global_state->dspp_to_crtc_id), crtc_id);
_dpu_rm_clear_mapping(&global_state->cdm_to_crtc_id, 1, crtc_id);
+ _dpu_rm_clear_mapping(global_state->cwb_to_crtc_id,
+ ARRAY_SIZE(global_state->cwb_to_crtc_id), crtc_id);
}
int dpu_rm_reserve(
@@ -692,6 +750,7 @@ int dpu_rm_get_assigned_resources(struct dpu_rm *rm,
switch (type) {
case DPU_HW_BLK_PINGPONG:
+ case DPU_HW_BLK_DCWB_PINGPONG:
hw_blks = rm->pingpong_blks;
hw_to_crtc_id = global_state->pingpong_to_crtc_id;
max_blks = ARRAY_SIZE(rm->pingpong_blks);
@@ -721,6 +780,11 @@ int dpu_rm_get_assigned_resources(struct dpu_rm *rm,
hw_to_crtc_id = &global_state->cdm_to_crtc_id;
max_blks = 1;
break;
+ case DPU_HW_BLK_CWB:
+ hw_blks = rm->cwb_blks;
+ hw_to_crtc_id = global_state->cwb_to_crtc_id;
+ max_blks = ARRAY_SIZE(rm->cwb_blks);
+ break;
default:
DPU_ERROR("blk type %d not managed by rm\n", type);
return 0;
@@ -731,6 +795,20 @@ int dpu_rm_get_assigned_resources(struct dpu_rm *rm,
if (hw_to_crtc_id[i] != crtc_id)
continue;
+ if (type == DPU_HW_BLK_PINGPONG) {
+ struct dpu_hw_pingpong *pp = to_dpu_hw_pingpong(hw_blks[i]);
+
+ if (pp->idx >= PINGPONG_CWB_0)
+ continue;
+ }
+
+ if (type == DPU_HW_BLK_DCWB_PINGPONG) {
+ struct dpu_hw_pingpong *pp = to_dpu_hw_pingpong(hw_blks[i]);
+
+ if (pp->idx < PINGPONG_CWB_0)
+ continue;
+ }
+
if (num_blks == blks_size) {
DPU_ERROR("More than %d resources assigned to crtc %d\n",
blks_size, crtc_id);
@@ -801,4 +879,10 @@ void dpu_rm_print_state(struct drm_printer *p,
dpu_rm_print_state_helper(p, rm->cdm_blk,
global_state->cdm_to_crtc_id);
drm_puts(p, "\n");
+
+ drm_puts(p, "\tcwb=");
+ for (i = 0; i < ARRAY_SIZE(global_state->cwb_to_crtc_id); i++)
+ dpu_rm_print_state_helper(p, rm->cwb_blks[i],
+ global_state->cwb_to_crtc_id[i]);
+ drm_puts(p, "\n");
}
--
2.34.1
