[PATCH 5.15 092/230] drm/amd/display: Set min dcfclk if pipe count is 0

Greg Kroah-Hartman
2022-07-11T09:52:53Z

From: Michael Strauss <michael.strauss@amd.com>

[ Upstream commit bc204778b4032b336cb3bde85bea852d79e7e389 ]

[WHY]
Clocks don't get recalculated in 0 stream/0 pipe configs,
blocking S0i3 if dcfclk gets high enough

[HOW]
Create DCN31 copy of DCN30 bandwidth validation func which
doesn't entirely skip validation in 0 pipe scenarios

Override dcfclk to vlevel 0/min value during validation if pipe
count is 0

Reviewed-by: Eric Yang <Eric.Yang2@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Michael Strauss <michael.strauss@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>
---
.../drm/amd/display/dc/dcn30/dcn30_resource.c | 2 +-
.../drm/amd/display/dc/dcn30/dcn30_resource.h | 7 +++
.../drm/amd/display/dc/dcn31/dcn31_resource.c | 63 ++++++++++++++++++-
3 files changed, 70 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c
index 0294d0cc4759..735c92a5aa36 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c
@@ -1856,7 +1856,7 @@ static struct pipe_ctx *dcn30_find_split_pipe(
return pipe;
}

-static noinline bool dcn30_internal_validate_bw(
+noinline bool dcn30_internal_validate_bw(
struct dc *dc,
struct dc_state *context,
display_e2e_pipe_params_st *pipes,
diff --git a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.h b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.h
index b754b89beadf..b92e4cc0232f 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.h
+++ b/drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.h
@@ -55,6 +55,13 @@ unsigned int dcn30_calc_max_scaled_time(

bool dcn30_validate_bandwidth(struct dc *dc, struct dc_state *context,
bool fast_validate);
+bool dcn30_internal_validate_bw(
+ struct dc *dc,
+ struct dc_state *context,
+ display_e2e_pipe_params_st *pipes,
+ int *pipe_cnt_out,
+ int *vlevel_out,
+ bool fast_validate);
void dcn30_calculate_wm_and_dlg(
struct dc *dc, struct dc_state *context,
display_e2e_pipe_params_st *pipes,
diff --git a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_resource.c b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_resource.c
index b60ab3cc0f11..7aadb35a3079 100644
--- a/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn31/dcn31_resource.c
@@ -1664,6 +1664,15 @@ static void dcn31_calculate_wm_and_dlg_fp(
if (context->bw_ctx.dml.soc.min_dcfclk > dcfclk)
dcfclk = context->bw_ctx.dml.soc.min_dcfclk;

+ /* We don't recalculate clocks for 0 pipe configs, which can block
+ * S0i3 as high clocks will block low power states
+ * Override any clocks that can block S0i3 to min here
+ */
+ if (pipe_cnt == 0) {
+ context->bw_ctx.bw.dcn.clk.dcfclk_khz = dcfclk; // always should be vlevel 0
+ return;
+ }
+
pipes[0].clks_cfg.voltage = vlevel;
pipes[0].clks_cfg.dcfclk_mhz = dcfclk;
pipes[0].clks_cfg.socclk_mhz = context->bw_ctx.dml.soc.clock_limits[vlevel].socclk_mhz;
@@ -1789,6 +1798,58 @@ static void dcn31_calculate_wm_and_dlg(
DC_FP_END();
}

+bool dcn31_validate_bandwidth(struct dc *dc,
+ struct dc_state *context,
+ bool fast_validate)
+{
+ bool out = false;
+
+ BW_VAL_TRACE_SETUP();
+
+ int vlevel = 0;
+ int pipe_cnt = 0;
+ display_e2e_pipe_params_st *pipes = kzalloc(dc->res_pool->pipe_count * sizeof(display_e2e_pipe_params_st), GFP_KERNEL);
+ DC_LOGGER_INIT(dc->ctx->logger);
+
+ BW_VAL_TRACE_COUNT();
+
+ out = dcn30_internal_validate_bw(dc, context, pipes, &pipe_cnt, &vlevel, fast_validate);
+
+ // Disable fast_validate to set min dcfclk in alculate_wm_and_dlg
+ if (pipe_cnt == 0)
+ fast_validate = false;
+
+ if (!out)
+ goto validate_fail;
+
+ BW_VAL_TRACE_END_VOLTAGE_LEVEL();
+
+ if (fast_validate) {
+ BW_VAL_TRACE_SKIP(fast);
+ goto validate_out;
+ }
+
+ dc->res_pool->funcs->calculate_wm_and_dlg(dc, context, pipes, pipe_cnt, vlevel);
+
+ BW_VAL_TRACE_END_WATERMARKS();
+
+ goto validate_out;
+
+validate_fail:
+ DC_LOG_WARNING("Mode Validation Warning: %s failed alidation.\n",
+ dml_get_status_message(context->bw_ctx.dml.vba.ValidationStatus[context->bw_ctx.dml.vba.soc.num_states]));
+
+ BW_VAL_TRACE_SKIP(fail);
+ out = false;
+
+validate_out:
+ kfree(pipes);
+
+ BW_VAL_TRACE_FINISH();
+
+ return out;
+}
+
static struct dc_cap_funcs cap_funcs = {
.get_dcc_compression_cap = dcn20_get_dcc_compression_cap
};
@@ -1871,7 +1932,7 @@ static struct resource_funcs dcn31_res_pool_funcs = {
.link_encs_assign = link_enc_cfg_link_encs_assign,
.link_enc_unassign = link_enc_cfg_link_enc_unassign,
.panel_cntl_create = dcn31_panel_cntl_create,
- .validate_bandwidth = dcn30_validate_bandwidth,
+ .validate_bandwidth = dcn31_validate_bandwidth,
.calculate_wm_and_dlg = dcn31_calculate_wm_and_dlg,
.update_soc_for_wm_a = dcn31_update_soc_for_wm_a,
.populate_dml_pipes = dcn31_populate_dml_pipes_from_context,
--
2.35.1