From 8e8fddab0d0acdefb1ad76852d954b2bbaa3896d Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Tue, 5 Mar 2019 00:10:28 +0200 Subject: [PATCH] drm: rcar-du: Skip LVDS1 output on Gen3 when using dual-link LVDS mode In dual-link LVDS mode, the LVDS1 encoder is used as a companion for LVDS0, and both encoders transmit data from DU0. The LVDS1 output of DU1 can't be used in that case, don't create an encoder and connector for it. Signed-off-by: Laurent Pinchart Reviewed-by: Jacopo Mondi Tested-by: Jacopo Mondi Acked-by: Sam Ravnborg Reviewed-by: Kieran Bingham --- drivers/gpu/drm/rcar-du/rcar_du_encoder.c | 12 ++++++++++++ drivers/gpu/drm/rcar-du/rcar_du_kms.c | 2 +- 2 files changed, 13 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c index 6c91753af7bc..0f00bdfe2366 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c @@ -16,6 +16,7 @@ #include "rcar_du_drv.h" #include "rcar_du_encoder.h" #include "rcar_du_kms.h" +#include "rcar_lvds.h" /* ----------------------------------------------------------------------------- * Encoder @@ -97,6 +98,17 @@ int rcar_du_encoder_init(struct rcar_du_device *rcdu, } } + /* + * On Gen3 skip the LVDS1 output if the LVDS1 encoder is used as a + * companion for LVDS0 in dual-link mode. + */ + if (rcdu->info->gen >= 3 && output == RCAR_DU_OUTPUT_LVDS1) { + if (rcar_lvds_dual_link(bridge)) { + ret = -ENOLINK; + goto done; + } + } + ret = drm_encoder_init(rcdu->ddev, encoder, &encoder_funcs, DRM_MODE_ENCODER_NONE, NULL); if (ret < 0) diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c index f8f7fff34dff..95c81e59e2f1 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c @@ -378,7 +378,7 @@ static int rcar_du_encoders_init_one(struct rcar_du_device *rcdu, } ret = rcar_du_encoder_init(rcdu, output, entity); - if (ret && ret != -EPROBE_DEFER) + if (ret && ret != -EPROBE_DEFER && ret != -ENOLINK) dev_warn(rcdu->dev, "failed to initialize encoder %pOF on output %u (%d), skipping\n", entity, output, ret);