[PATCH AUTOSEL 6.11 208/244] drm/amd/display: Unlock Pipes Based On DET Allocation

Sasha Levin
2024-09-25T11:51:52Z

From: Austin Zheng <Austin.Zheng@amd.com>

[ Upstream commit 4af0d8ebf74ccbb60d33fdd410891283dd6cb109 ]

[Why]
DML21 does not allocate DET evenly between pipes.
May result in underflow when unlocking the pipes as DET could
be overallocated.

[How]
1. Unlock pipes that have a decreased amount of DET allocation
2. Wait for the double buffer to be updated.
3. Unlock the remaining pipes.

Reviewed-by: Alvin Lee <alvin.lee2@amd.com>
Signed-off-by: Austin Zheng <Austin.Zheng@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../gpu/drm/amd/display/dc/core/dc_resource.c | 28 ++++++
.../display/dc/hubbub/dcn401/dcn401_hubbub.c | 23 +++++
.../amd/display/dc/hwss/dcn401/dcn401_hwseq.c | 91 +++++++++++++++++++
.../amd/display/dc/hwss/dcn401/dcn401_hwseq.h | 2 +
.../amd/display/dc/hwss/dcn401/dcn401_init.c | 2 +-
.../gpu/drm/amd/display/dc/inc/hw/dchubbub.h | 1 +
drivers/gpu/drm/amd/display/dc/inc/resource.h | 5 +
7 files changed, 151 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
index 913adca531fc4..5ab5866dc73af 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
@@ -5275,3 +5275,31 @@ void resource_init_common_dml2_callbacks(struct dc *dc, struct dml2_configuratio
dml2_options->svp_pstate.callbacks.remove_phantom_streams_and_planes = &dc_state_remove_phantom_streams_and_planes;
dml2_options->svp_pstate.callbacks.release_phantom_streams_and_planes = &dc_state_release_phantom_streams_and_planes;
}
+
+/* Returns number of DET segments allocated for a given OTG_MASTER pipe */
+int resource_calculate_det_for_stream(struct dc_state *state, struct pipe_ctx *otg_master)
+{
+ struct pipe_ctx *opp_heads[MAX_PIPES];
+ struct pipe_ctx *dpp_pipes[MAX_PIPES];
+
+ int dpp_count = 0;
+ int det_segments = 0;
+
+ if (!otg_master->stream)
+ return 0;
+
+ int slice_count = resource_get_opp_heads_for_otg_master(otg_master,
+ &state->res_ctx, opp_heads);
+
+ for (int slice_idx = 0; slice_idx < slice_count; slice_idx++) {
+ if (opp_heads[slice_idx]->plane_state) {
+ dpp_count = resource_get_dpp_pipes_for_opp_head(
+ opp_heads[slice_idx],
+ &state->res_ctx,
+ dpp_pipes);
+ for (int dpp_idx = 0; dpp_idx < dpp_count; dpp_idx++)
+ det_segments += dpp_pipes[dpp_idx]->hubp_regs.det_size;
+ }
+ }
+ return det_segments;
+}
diff --git a/drivers/gpu/drm/amd/display/dc/hubbub/dcn401/dcn401_hubbub.c b/drivers/gpu/drm/amd/display/dc/hubbub/dcn401/dcn401_hubbub.c
index 181041d6d177c..70ddc0392a5b6 100644
--- a/drivers/gpu/drm/amd/display/dc/hubbub/dcn401/dcn401_hubbub.c
+++ b/drivers/gpu/drm/amd/display/dc/hubbub/dcn401/dcn401_hubbub.c
@@ -1170,6 +1170,28 @@ static void dcn401_program_compbuf_segments(struct hubbub *hubbub, unsigned comp
}
}

+static void dcn401_wait_for_det_update(struct hubbub *hubbub, int hubp_inst)
+{
+ struct dcn20_hubbub *hubbub2 = TO_DCN20_HUBBUB(hubbub);
+
+ switch (hubp_inst) {
+ case 0:
+ REG_WAIT(DCHUBBUB_DET0_CTRL, DET0_SIZE_CURRENT, hubbub2->det0_size, 1, 100000); /* 1 vupdate at 10hz */
+ break;
+ case 1:
+ REG_WAIT(DCHUBBUB_DET1_CTRL, DET1_SIZE_CURRENT, hubbub2->det1_size, 1, 100000);
+ break;
+ case 2:
+ REG_WAIT(DCHUBBUB_DET2_CTRL, DET2_SIZE_CURRENT, hubbub2->det2_size, 1, 100000);
+ break;
+ case 3:
+ REG_WAIT(DCHUBBUB_DET3_CTRL, DET3_SIZE_CURRENT, hubbub2->det3_size, 1, 100000);
+ break;
+ default:
+ break;
+ }
+}
+
static const struct hubbub_funcs hubbub4_01_funcs = {
.update_dchub = hubbub2_update_dchub,
.init_dchub_sys_ctx = hubbub3_init_dchub_sys_ctx,
@@ -1192,6 +1214,7 @@ static const struct hubbub_funcs hubbub4_01_funcs = {
.set_request_limit = hubbub32_set_request_limit,
.program_det_segments = dcn401_program_det_segments,
.program_compbuf_segments = dcn401_program_compbuf_segments,
+ .wait_for_det_update = dcn401_wait_for_det_update,
};

void hubbub401_construct(struct dcn20_hubbub *hubbub2,
diff --git a/drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c b/drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c
index 7c724cf682840..edd302ebbdfcf 100644
--- a/drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.c
@@ -1677,3 +1677,94 @@ void dcn401_hardware_release(struct dc *dc)
}
}

+void dcn401_wait_for_det_buffer_update(struct dc *dc, struct dc_state *context, struct pipe_ctx *otg_master)
+{
+ struct pipe_ctx *opp_heads[MAX_PIPES];
+ struct pipe_ctx *dpp_pipes[MAX_PIPES];
+ struct hubbub *hubbub = dc->res_pool->hubbub;
+ int dpp_count = 0;
+
+ if (!otg_master->stream)
+ return;
+
+ int slice_count = resource_get_opp_heads_for_otg_master(otg_master,
+ &context->res_ctx, opp_heads);
+
+ for (int slice_idx = 0; slice_idx < slice_count; slice_idx++) {
+ if (opp_heads[slice_idx]->plane_state) {
+ dpp_count = resource_get_dpp_pipes_for_opp_head(
+ opp_heads[slice_idx],
+ &context->res_ctx,
+ dpp_pipes);
+ for (int dpp_idx = 0; dpp_idx < dpp_count; dpp_idx++) {
+ struct pipe_ctx *dpp_pipe = dpp_pipes[dpp_idx];
+ if (dpp_pipe && hubbub &&
+ dpp_pipe->plane_res.hubp &&
+ hubbub->funcs->wait_for_det_update)
+ hubbub->funcs->wait_for_det_update(hubbub, dpp_pipe->plane_res.hubp->inst);
+ }
+ }
+ }
+}
+
+void dcn401_interdependent_update_lock(struct dc *dc,
+ struct dc_state *context, bool lock)
+{
+ unsigned int i = 0;
+ struct pipe_ctx *pipe = NULL;
+ struct timing_generator *tg = NULL;
+ bool pipe_unlocked[MAX_PIPES] = {0};
+
+ if (lock) {
+ for (i = 0; i < dc->res_pool->pipe_count; i++) {
+ pipe = &context->res_ctx.pipe_ctx[i];
+ tg = pipe->stream_res.tg;
+
+ if (!resource_is_pipe_type(pipe, OTG_MASTER) ||
+ !tg->funcs->is_tg_enabled(tg) ||
+ dc_state_get_pipe_subvp_type(context, pipe) == SUBVP_PHANTOM)
+ continue;
+ dc->hwss.pipe_control_lock(dc, pipe, true);
+ }
+ } else {
+ /* Unlock pipes based on the change in DET allocation instead of pipe index
+ * Prevents over allocation of DET during unlock process
+ * e.g. 2 pipe config with different streams with a max of 20 DET segments
+ * Before: After:
+ * - Pipe0: 10 DET segments - Pipe0: 12 DET segments
+ * - Pipe1: 10 DET segments - Pipe1: 8 DET segments
+ * If Pipe0 gets updated first, 22 DET segments will be allocated
+ */
+ for (i = 0; i < dc->res_pool->pipe_count; i++) {
+ pipe = &context->res_ctx.pipe_ctx[i];
+ tg = pipe->stream_res.tg;
+ int current_pipe_idx = i;
+
+ if (!resource_is_pipe_type(pipe, OTG_MASTER) ||
+ !tg->funcs->is_tg_enabled(tg) ||
+ dc_state_get_pipe_subvp_type(context, pipe) == SUBVP_PHANTOM) {
+ pipe_unlocked[i] = true;
+ continue;
+ }
+
+ // If the same stream exists in old context, ensure the OTG_MASTER pipes for the same stream get compared
+ struct pipe_ctx *old_otg_master = resource_get_otg_master_for_stream(&dc->current_state->res_ctx, pipe->stream);
+
+ if (old_otg_master)
+ current_pipe_idx = old_otg_master->pipe_idx;
+ if (resource_calculate_det_for_stream(context, pipe) <
+ resource_calculate_det_for_stream(dc->current_state, &dc->current_state->res_ctx.pipe_ctx[current_pipe_idx])) {
+ dc->hwss.pipe_control_lock(dc, pipe, false);
+ pipe_unlocked[i] = true;
+ dcn401_wait_for_det_buffer_update(dc, context, pipe);
+ }
+ }
+
+ for (i = 0; i < dc->res_pool->pipe_count; i++) {
+ if (pipe_unlocked[i])
+ continue;
+ pipe = &context->res_ctx.pipe_ctx[i];
+ dc->hwss.pipe_control_lock(dc, pipe, false);
+ }
+ }
+}
diff --git a/drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.h b/drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.h
index 8e9c1c17aa662..3ecb1ebffcee8 100644
--- a/drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.h
+++ b/drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_hwseq.h
@@ -81,4 +81,6 @@ void dcn401_hardware_release(struct dc *dc);
void dcn401_update_odm(struct dc *dc, struct dc_state *context,
struct pipe_ctx *otg_master);
void adjust_hotspot_between_slices_for_2x_magnify(uint32_t cursor_width, struct dc_cursor_position *pos_cpy);
+void dcn401_wait_for_det_buffer_update(struct dc *dc, struct dc_state *context, struct pipe_ctx *otg_master);
+void dcn401_interdependent_update_lock(struct dc *dc, struct dc_state *context, bool lock);
#endif /* __DC_HWSS_DCN401_H__ */
diff --git a/drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_init.c b/drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_init.c
index 6a768702c7bde..28f3eb8f4b2d8 100644
--- a/drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_init.c
+++ b/drivers/gpu/drm/amd/display/dc/hwss/dcn401/dcn401_init.c
@@ -38,7 +38,7 @@ static const struct hw_sequencer_funcs dcn401_funcs = {
.disable_audio_stream = dce110_disable_audio_stream,
.disable_plane = dcn20_disable_plane,
.pipe_control_lock = dcn20_pipe_control_lock,
- .interdependent_update_lock = dcn32_interdependent_update_lock,
+ .interdependent_update_lock = dcn401_interdependent_update_lock,
.cursor_lock = dcn10_cursor_lock,
.prepare_bandwidth = dcn401_prepare_bandwidth,
.optimize_bandwidth = dcn401_optimize_bandwidth,
diff --git a/drivers/gpu/drm/amd/display/dc/inc/hw/dchubbub.h b/drivers/gpu/drm/amd/display/dc/inc/hw/dchubbub.h
index dd2b2864876c7..67c32401893e8 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/hw/dchubbub.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/hw/dchubbub.h
@@ -227,6 +227,7 @@ struct hubbub_funcs {
void (*get_mall_en)(struct hubbub *hubbub, unsigned int *mall_in_use);
void (*program_det_segments)(struct hubbub *hubbub, int hubp_inst, unsigned det_buffer_size_seg);
void (*program_compbuf_segments)(struct hubbub *hubbub, unsigned compbuf_size_seg, bool safe_to_increase);
+ void (*wait_for_det_update)(struct hubbub *hubbub, int hubp_inst);
};

struct hubbub {
diff --git a/drivers/gpu/drm/amd/display/dc/inc/resource.h b/drivers/gpu/drm/amd/display/dc/inc/resource.h
index 96d40d33a1f99..9cd80d3864c7b 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/resource.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/resource.h
@@ -639,4 +639,9 @@ struct dscl_prog_data *resource_get_dscl_prog_data(struct pipe_ctx *pipe_ctx);
* @dml2_options: struct to hold callbacks
*/
void resource_init_common_dml2_callbacks(struct dc *dc, struct dml2_configuration_options *dml2_options);
+
+/*
+ *Calculate total DET allocated for all pipes for a given OTG_MASTER pipe
+ */
+int resource_calculate_det_for_stream(struct dc_state *state, struct pipe_ctx *otg_master);
#endif /* DRIVERS_GPU_DRM_AMD_DC_DEV_DC_INC_RESOURCE_H_ */
--
2.43.0