[PATCH AUTOSEL 6.2 46/60] drm/amd/display: Do not commit pipe when updating DRR

Sasha Levin
2023-02-27T02:04:44Z

From: Wesley Chalmers <Wesley.Chalmers@amd.com>

[ Upstream commit 8f0d304d21b351d65e8c434c5399a40231876ba1 ]

[WHY]
DRR and Pipe cannot be updated on
the same frame, or else underflow will
occur.

Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Wesley Chalmers <Wesley.Chalmers@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/amd/display/dc/core/dc.c | 15 +++++++++++++++
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.h | 3 ++-
drivers/gpu/drm/amd/display/dc/dcn30/dcn30_optc.c | 9 +++++++++
drivers/gpu/drm/amd/display/dc/dcn30/dcn30_optc.h | 2 ++
.../drm/amd/display/dc/inc/hw/timing_generator.h | 1 +
5 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index c03e86e49fea3..698ef50e83f3f 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -3335,6 +3335,21 @@ static void commit_planes_for_stream(struct dc *dc,

dc_z10_restore(dc);

+ if (update_type == UPDATE_TYPE_FULL) {
+ /* wait for all double-buffer activity to clear on all pipes */
+ int pipe_idx;
+
+ for (pipe_idx = 0; pipe_idx < dc->res_pool->pipe_count; pipe_idx++) {
+ struct pipe_ctx *pipe_ctx = &context->res_ctx.pipe_ctx[pipe_idx];
+
+ if (!pipe_ctx->stream)
+ continue;
+
+ if (pipe_ctx->stream_res.tg->funcs->wait_drr_doublebuffer_pending_clear)
+ pipe_ctx->stream_res.tg->funcs->wait_drr_doublebuffer_pending_clear(pipe_ctx->stream_res.tg);
+ }
+ }
+
if (get_seamless_boot_stream_count(context) > 0 && surface_count > 0) {
/* Optimize seamless boot flag keeps clocks and watermarks high until
* first flip. After first flip, optimization is required to lower
diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.h b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.h
index 88ac5f6f4c96c..0b37bb0e184b2 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.h
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.h
@@ -519,7 +519,8 @@ struct dcn_optc_registers {
type OTG_CRC_DATA_STREAM_COMBINE_MODE;\
type OTG_CRC_DATA_STREAM_SPLIT_MODE;\
type OTG_CRC_DATA_FORMAT;\
- type OTG_V_TOTAL_LAST_USED_BY_DRR;
+ type OTG_V_TOTAL_LAST_USED_BY_DRR;\
+ type OTG_DRR_TIMING_DBUF_UPDATE_PENDING;

#define TG_REG_FIELD_LIST_DCN3_2(type) \
type OTG_H_TIMING_DIV_MODE_MANUAL;
diff --git a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_optc.c b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_optc.c
index 867d60151aebb..08b92715e2e64 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_optc.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_optc.c
@@ -291,6 +291,14 @@ static void optc3_set_timing_double_buffer(struct timing_generator *optc, bool e
OTG_DRR_TIMING_DBUF_UPDATE_MODE, mode);
}

+void optc3_wait_drr_doublebuffer_pending_clear(struct timing_generator *optc)
+{
+ struct optc *optc1 = DCN10TG_FROM_TG(optc);
+
+ REG_WAIT(OTG_DOUBLE_BUFFER_CONTROL, OTG_DRR_TIMING_DBUF_UPDATE_PENDING, 0, 2, 100000); /* 1 vupdate at 5hz */
+
+}
+
void optc3_set_vtotal_min_max(struct timing_generator *optc, int vtotal_min, int vtotal_max)
{
optc1_set_vtotal_min_max(optc, vtotal_min, vtotal_max);
@@ -360,6 +368,7 @@ static struct timing_generator_funcs dcn30_tg_funcs = {
.program_manual_trigger = optc2_program_manual_trigger,
.setup_manual_trigger = optc2_setup_manual_trigger,
.get_hw_timing = optc1_get_hw_timing,
+ .wait_drr_doublebuffer_pending_clear = optc3_wait_drr_doublebuffer_pending_clear,
};

void dcn30_timing_generator_init(struct optc *optc1)
diff --git a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_optc.h b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_optc.h
index dd45a5499b078..fb06dc9a48937 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_optc.h
+++ b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_optc.h
@@ -279,6 +279,7 @@
SF(OTG0_OTG_DRR_TRIGGER_WINDOW, OTG_DRR_TRIGGER_WINDOW_END_X, mask_sh),\
SF(OTG0_OTG_DRR_V_TOTAL_CHANGE, OTG_DRR_V_TOTAL_CHANGE_LIMIT, mask_sh),\
SF(OTG0_OTG_H_TIMING_CNTL, OTG_H_TIMING_DIV_BY2, mask_sh),\
+ SF(OTG0_OTG_DOUBLE_BUFFER_CONTROL, OTG_DRR_TIMING_DBUF_UPDATE_PENDING, mask_sh),\
SF(OTG0_OTG_DOUBLE_BUFFER_CONTROL, OTG_DRR_TIMING_DBUF_UPDATE_MODE, mask_sh),\
SF(OTG0_OTG_DOUBLE_BUFFER_CONTROL, OTG_BLANK_DATA_DOUBLE_BUFFER_EN, mask_sh)

@@ -317,6 +318,7 @@
SF(OTG0_OTG_DRR_TRIGGER_WINDOW, OTG_DRR_TRIGGER_WINDOW_END_X, mask_sh),\
SF(OTG0_OTG_DRR_V_TOTAL_CHANGE, OTG_DRR_V_TOTAL_CHANGE_LIMIT, mask_sh),\
SF(OTG0_OTG_H_TIMING_CNTL, OTG_H_TIMING_DIV_MODE, mask_sh),\
+ SF(OTG0_OTG_DOUBLE_BUFFER_CONTROL, OTG_DRR_TIMING_DBUF_UPDATE_PENDING, mask_sh),\
SF(OTG0_OTG_DOUBLE_BUFFER_CONTROL, OTG_DRR_TIMING_DBUF_UPDATE_MODE, mask_sh)

void dcn30_timing_generator_init(struct optc *optc1);
diff --git a/drivers/gpu/drm/amd/display/dc/inc/hw/timing_generator.h b/drivers/gpu/drm/amd/display/dc/inc/hw/timing_generator.h
index 0e42e721dd15a..1d9f9c53d2bd6 100644
--- a/drivers/gpu/drm/amd/display/dc/inc/hw/timing_generator.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/hw/timing_generator.h
@@ -331,6 +331,7 @@ struct timing_generator_funcs {
uint32_t vtotal_change_limit);

void (*init_odm)(struct timing_generator *tg);
+ void (*wait_drr_doublebuffer_pending_clear)(struct timing_generator *tg);
};

#endif
--
2.39.0