From: Austin Zheng Date: Fri, 20 Sep 2024 18:22:38 +0000 (-0400) Subject: drm/amd/display: Flip All Planes Under OTG Master When Flip Immediate X-Git-Tag: v6.13-rc1~122^2~15^2~148 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=bd5230b1a6f24447aa604e631e70ffe62834ff74;p=thirdparty%2Flinux.git drm/amd/display: Flip All Planes Under OTG Master When Flip Immediate [Why] The MPO plane will receive a flip but desktop plane may not receive a flip when GSL is enabled. As a result, system will be stuck waiting for a flip that was never sent. [How] Set update address update flag of all flip_immediate planes if there are multiple planes. Reviewed-by: Dillon Varone Signed-off-by: Austin Zheng Signed-off-by: Rodrigo Siqueira Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c index f4a5accf1db99..48057ac22cbdb 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc.c @@ -2661,6 +2661,29 @@ static enum surface_update_type det_surface_update(const struct dc *dc, return overall_type; } +/* May need to flip the desktop plane in cases where MPO plane receives a flip but desktop plane doesn't + * while both planes are flip_immediate + */ +static void force_immediate_gsl_plane_flip(struct dc *dc, struct dc_surface_update *updates, int surface_count) +{ + bool has_flip_immediate_plane = false; + int i; + + for (i = 0; i < surface_count; i++) { + if (updates[i].surface->flip_immediate) { + has_flip_immediate_plane = true; + break; + } + } + + if (has_flip_immediate_plane && surface_count > 1) { + for (i = 0; i < surface_count; i++) { + if (updates[i].surface->flip_immediate) + updates[i].surface->update_flags.bits.addr_update = 1; + } + } +} + static enum surface_update_type check_update_surfaces_for_stream( struct dc *dc, struct dc_surface_update *updates, @@ -3177,6 +3200,11 @@ static bool update_planes_and_stream_state(struct dc *dc, context = dc->current_state; update_type = dc_check_update_surfaces_for_stream( dc, srf_updates, surface_count, stream_update, stream_status); + /* It is possible to receive a flip for one plane while there are multiple flip_immediate planes in the same stream. + * E.g. Desktop and MPO plane are flip_immediate but only the MPO plane received a flip + * Force the other flip_immediate planes to flip so GSL doesn't wait for a flip that won't come. + */ + force_immediate_gsl_plane_flip(dc, srf_updates, surface_count); if (update_type == UPDATE_TYPE_FULL) backup_planes_and_stream_state(&dc->scratch.current_state, stream); @@ -4807,6 +4835,11 @@ static bool update_planes_and_stream_v1(struct dc *dc, update_type = dc_check_update_surfaces_for_stream( dc, srf_updates, surface_count, stream_update, stream_status); + /* It is possible to receive a flip for one plane while there are multiple flip_immediate planes in the same stream. + * E.g. Desktop and MPO plane are flip_immediate but only the MPO plane received a flip + * Force the other flip_immediate planes to flip so GSL doesn't wait for a flip that won't come. + */ + force_immediate_gsl_plane_flip(dc, srf_updates, surface_count); if (update_type >= UPDATE_TYPE_FULL) {