From: Eric Yang Date: Thu, 14 Sep 2017 23:03:04 +0000 (-0400) Subject: drm/amd/display: add back removed hack for mpcc add X-Git-Tag: v4.19~2140^2~3^2~135 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=904aa42e77aa7fb5f95408b4d1ffb4b2c3a805d7;p=platform%2Fkernel%2Flinux-rpi.git drm/amd/display: add back removed hack for mpcc add A previous changed removed the hack to match mpcc_idd with mi instance. This causes pstate hang on resume from hibernate for yet unknown reason. Add the hack back for now to work around the issue. More debugging required in init_hw to root cause the hang. Signed-off-by: Eric Yang Reviewed-by: Tony Cheng Acked-by: Harry Wentland Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_mpc.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_mpc.c index 8e767c8..6e56fa3 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_mpc.c +++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_mpc.c @@ -279,6 +279,18 @@ static int mpc10_mpcc_add(struct mpc *mpc, struct mpcc_cfg *cfg) if (z_idx == cfg->tree_cfg->num_pipes) { ASSERT(cfg->z_index <= cfg->tree_cfg->num_pipes); mpcc_id = mpc10_get_idle_mpcc_id(mpc10); + + /* + * TODO: remove hack + * Note: currently there is a bug in init_hw such that + * on resume from hibernate, BIOS sets up MPCC0, and + * we do mpcc_remove but the mpcc cannot go to idle + * after remove. This cause us to pick mpcc1 here, + * which causes a pstate hang for yet unknown reason. + */ + mpcc_id = cfg->dpp_id; + /* end hack*/ + ASSERT(!(mpc10->mpcc_in_use_mask & 1 << mpcc_id)); if (mpc->ctx->dc->debug.sanity_checks)