From: Ken Chalmers Date: Wed, 20 Sep 2017 11:48:47 -0400 Subject: drm/amd/display: fix ASSERT() caused by missing registers. Git-commit: 5df921d4c0e3e2065b961ac8d4269be68f80801d Patch-mainline: v4.15-rc1 References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166 Signed-off-by: Ken Chalmers Reviewed-by: Tony Cheng Acked-by: Harry Wentland Signed-off-by: Alex Deucher Acked-by: Petr Tesarik --- drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c | 42 +++++++------- 1 file changed, 23 insertions(+), 19 deletions(-) --- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c +++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c @@ -771,14 +771,16 @@ static void power_on_plane( struct dce_hwseq *hws, int plane_id) { - REG_SET(DC_IP_REQUEST_CNTL, 0, - IP_REQUEST_EN, 1); - dpp_pg_control(hws, plane_id, true); - hubp_pg_control(hws, plane_id, true); - REG_SET(DC_IP_REQUEST_CNTL, 0, - IP_REQUEST_EN, 0); - dm_logger_write(hws->ctx->logger, LOG_DEBUG, - "Un-gated front end for pipe %d\n", plane_id); + if (REG(DC_IP_REQUEST_CNTL)) { + REG_SET(DC_IP_REQUEST_CNTL, 0, + IP_REQUEST_EN, 1); + dpp_pg_control(hws, plane_id, true); + hubp_pg_control(hws, plane_id, true); + REG_SET(DC_IP_REQUEST_CNTL, 0, + IP_REQUEST_EN, 0); + dm_logger_write(hws->ctx->logger, LOG_DEBUG, + "Un-gated front end for pipe %d\n", plane_id); + } } static void undo_DEGVIDCN10_253_wa(struct dc *dc) @@ -1130,18 +1132,20 @@ static void plane_atomic_power_down(stru struct dce_hwseq *hws = dc->hwseq; struct transform *xfm = dc->res_pool->transforms[fe_idx]; - REG_SET(DC_IP_REQUEST_CNTL, 0, - IP_REQUEST_EN, 1); - dpp_pg_control(hws, fe_idx, false); - hubp_pg_control(hws, fe_idx, false); - xfm->funcs->transform_reset(xfm); - REG_SET(DC_IP_REQUEST_CNTL, 0, - IP_REQUEST_EN, 0); - dm_logger_write(dc->ctx->logger, LOG_DEBUG, - "Power gated front end %d\n", fe_idx); + if (REG(DC_IP_REQUEST_CNTL)) { + REG_SET(DC_IP_REQUEST_CNTL, 0, + IP_REQUEST_EN, 1); + dpp_pg_control(hws, fe_idx, false); + hubp_pg_control(hws, fe_idx, false); + xfm->funcs->transform_reset(xfm); + REG_SET(DC_IP_REQUEST_CNTL, 0, + IP_REQUEST_EN, 0); + dm_logger_write(dc->ctx->logger, LOG_DEBUG, + "Power gated front end %d\n", fe_idx); - if (dc->debug.sanity_checks) - verify_allow_pstate_change_high(dc->hwseq); + if (dc->debug.sanity_checks) + verify_allow_pstate_change_high(dc->hwseq); + } }