[AMD Public Use] Reviewed-by: Roman Li <Roman.Li@xxxxxxx> -----Original Message----- From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of Nicholas Kazlauskas Sent: Monday, June 29, 2020 4:49 PM To: amd-gfx@xxxxxxxxxxxxxxxxxxxxx Cc: Lakha, Bhawanpreet <Bhawanpreet.Lakha@xxxxxxx>; Siqueira, Rodrigo <Rodrigo.Siqueira@xxxxxxx>; Wu, Hersen <hersenxs.wu@xxxxxxx>; Kazlauskas, Nicholas <Nicholas.Kazlauskas@xxxxxxx> Subject: [PATCH] drm/amd/display: Only revalidate bandwidth on medium and fast updates [Why] Changes that are fast don't require updating DLG parameters making this call unnecessary. Considering this is an expensive call it should not be done on every flip. DML touches clocks, p-state support, DLG params and a few other DC internal flags and these aren't expected during fast. A hang has been reported with this change when called on every flip which suggests that modifying these fields is not recommended behavior on fast updates. [How] Guard the validation to only happen if update type isn't FAST. Bug: https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitlab.freedesktop.org%2Fdrm%2Famd%2F-%2Fissues%2F1191&data=02%7C01%7Croman.li%40amd.com%7Cc98c2d3c363643a4fef208d81c6dfa68%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637290606647861029&sdata=%2B3rZlvLgef1c2FOYTKx37U%2Fbr%2BWOxI9GXVI2K7HjH3E%3D&reserved=0 Fixes: e1995f0909e3 ("drm/amd/display: Revalidate bandwidth before commiting DC updates") Cc: Hersen Wu <hersenxs.wu@xxxxxxx> Cc: Bhawanpreet Lakha <Bhawanpreet.Lakha@xxxxxxx> Cc: Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx> Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@xxxxxxx> --- drivers/gpu/drm/amd/display/dc/core/dc.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c index 67402d75e67e..942ceb0f6383 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc.c @@ -2607,10 +2607,12 @@ void dc_commit_updates_for_stream(struct dc *dc, copy_stream_update_to_stream(dc, context, stream, stream_update); - if (!dc->res_pool->funcs->validate_bandwidth(dc, context, false)) { - DC_ERROR("Mode validation failed for stream update!\n"); - dc_release_state(context); - return; + if (update_type > UPDATE_TYPE_FAST) { + if (!dc->res_pool->funcs->validate_bandwidth(dc, context, false)) { + DC_ERROR("Mode validation failed for stream update!\n"); + dc_release_state(context); + return; + } } commit_planes_for_stream( -- 2.25.1 _______________________________________________ amd-gfx mailing list amd-gfx@xxxxxxxxxxxxxxxxxxxxx https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.freedesktop.org%2Fmailman%2Flistinfo%2Famd-gfx&data=02%7C01%7Croman.li%40amd.com%7Cc98c2d3c363643a4fef208d81c6dfa68%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637290606647861029&sdata=EPY6DwDOG88a944QieZj%2F8NSeBJTot2z1WLghTM2Iuw%3D&reserved=0 _______________________________________________ amd-gfx mailing list amd-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/amd-gfx
