From: Nicholas Kazlauskas nicholas.kazlauskas@amd.com

[WHY] Hangs with Z8 can occur if running an older unfixed PMFW version.

[HOW] Fallback to RCG only for dynamic IPS2 states if it's not newer than 93.12. Limit to DCN35.

Cc: Mario Limonciello mario.limonciello@amd.com Cc: Alex Deucher alexander.deucher@amd.com Cc: stable@vger.kernel.org Reviewed-by: Charlene Liu charlene.liu@amd.com Signed-off-by: Nicholas Kazlauskas nicholas.kazlauskas@amd.com Signed-off-by: Alex Hung alex.hung@amd.com --- .../gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c | 6 ++++++ 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c index 97164b5585a8..b46a3afe48ca 100644 --- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c +++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c @@ -1222,6 +1222,12 @@ void dcn35_clk_mgr_construct( ctx->dc->debug.disable_dpp_power_gate = false; ctx->dc->debug.disable_hubp_power_gate = false; ctx->dc->debug.disable_dsc_power_gate = false; + + /* Disable dynamic IPS2 in older PMFW (93.12) for Z8 interop. */ + if (ctx->dc->config.disable_ips == DMUB_IPS_ENABLE && + ctx->dce_version == DCN_VERSION_3_5 && + ((clk_mgr->base.smu_ver & 0x00FFFFFF) <= 0x005d0c00)) + ctx->dc->config.disable_ips = DMUB_IPS_RCG_IN_ACTIVE_IPS2_IN_OFF; } else { /*let's reset the config control flag*/ ctx->dc->config.disable_ips = DMUB_IPS_DISABLE_ALL; /*pmfw not support it, disable it all*/