From: Nicholas Kazlauskas Date: Tue, 5 Nov 2019 17:51:51 +0000 (-0500) Subject: drm/amd/display: Spin for DMCUB PHY init in DC X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=a6e4da40bda5682072f1b26b19ce3d25a1b43bf7;p=linux.git drm/amd/display: Spin for DMCUB PHY init in DC [Why] DCN will hang if we access registers before PHY init is done. So we need to spin or abort. [How] On hardware with DMCUB running and working we shouldn't time out waiting for this to finish and we shouldn't hit the spin cycle. If there's no hardware support then we should exit out of the function early assuming that PHY init was already done elsewhere. If we hit the timeout then there's likely a bug in firmware or software and we need to debug - add errors and asserts as appropriate. Signed-off-by: Nicholas Kazlauskas Reviewed-by: Tony Cheng Acked-by: Rodrigo Siqueira Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c index 8d348a5f5599c..59c298a6484f3 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c +++ b/drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c @@ -112,10 +112,23 @@ void dc_dmub_srv_wait_phy_init(struct dc_dmub_srv *dc_dmub_srv) struct dc_context *dc_ctx = dc_dmub_srv->ctx; enum dmub_status status; - status = dmub_srv_wait_for_phy_init(dmub, 10000000); - if (status != DMUB_STATUS_OK) { - DC_ERROR("Error waiting for DMUB phy init: status=%d\n", - status); + for (;;) { + /* Wait up to a second for PHY init. */ + status = dmub_srv_wait_for_phy_init(dmub, 1000000); + if (status == DMUB_STATUS_OK) + /* Initialization OK */ + break; + + DC_ERROR("DMCUB PHY init failed: status=%d\n", status); ASSERT(0); + + if (status != DMUB_STATUS_TIMEOUT) + /* + * Server likely initialized or we don't have + * DMCUB HW support - this won't end. + */ + break; + + /* Continue spinning so we don't hang the ASIC. */ } }