6.8-stable review patch. If anyone has any objections, please let me know.
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From: Nicholas Kazlauskas nicholas.kazlauskas@amd.com
[ Upstream commit 6226a5aa77370329e01ee8abe50a95e60618ce97 ]
[Why] Workaroud for a race condition where DMCUB is in the process of committing to IPS1 during the handshake causing us to miss the transition into IPS2 and touch the INBOX1 RPTR causing a HW hang.
[How] Disable the reallow to ensure that we have enough of a gap between entry and exit and we're not seeing back-to-back wake_and_executes.
Reviewed-by: Ovidiu Bunea ovidiu.bunea@amd.com Acked-by: Hamza Mahfooz hamza.mahfooz@amd.com Signed-off-by: Nicholas Kazlauskas nicholas.kazlauskas@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/dc.h | 1 + drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c | 4 ++-- .../gpu/drm/amd/display/dc/resource/dcn35/dcn35_resource.c | 1 + 3 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h index f1342314f7f43..fc60fa5814fbe 100644 --- a/drivers/gpu/drm/amd/display/dc/dc.h +++ b/drivers/gpu/drm/amd/display/dc/dc.h @@ -987,6 +987,7 @@ struct dc_debug_options { bool psp_disabled_wa; unsigned int ips2_eval_delay_us; unsigned int ips2_entry_delay_us; + bool disable_dmub_reallow_idle; bool disable_timeout; bool disable_extblankadj; unsigned int static_screen_wait_frames; diff --git a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c index 363d522603a21..9084b320849a6 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c +++ b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c @@ -1364,7 +1364,7 @@ bool dc_wake_and_execute_dmub_cmd_list(const struct dc_context *ctx, unsigned in else result = dm_execute_dmub_cmd(ctx, cmd, wait_type);
- if (result && reallow_idle) + if (result && reallow_idle && !ctx->dc->debug.disable_dmub_reallow_idle) dc_dmub_srv_apply_idle_power_optimizations(ctx->dc, true);
return result; @@ -1413,7 +1413,7 @@ bool dc_wake_and_execute_gpint(const struct dc_context *ctx, enum dmub_gpint_com
result = dc_dmub_execute_gpint(ctx, command_code, param, response, wait_type);
- if (result && reallow_idle) + if (result && reallow_idle && !ctx->dc->debug.disable_dmub_reallow_idle) dc_dmub_srv_apply_idle_power_optimizations(ctx->dc, true);
return result; diff --git a/drivers/gpu/drm/amd/display/dc/resource/dcn35/dcn35_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dcn35/dcn35_resource.c index 04d230aa8861f..78c315541f031 100644 --- a/drivers/gpu/drm/amd/display/dc/resource/dcn35/dcn35_resource.c +++ b/drivers/gpu/drm/amd/display/dc/resource/dcn35/dcn35_resource.c @@ -782,6 +782,7 @@ static const struct dc_debug_options debug_defaults_drv = { .psp_disabled_wa = true, .ips2_eval_delay_us = 2000, .ips2_entry_delay_us = 800, + .disable_dmub_reallow_idle = true, .static_screen_wait_frames = 2, };