[PATCH 06/12] drm: rcar-du: Replace direct DRM encoder access with cast macro

[Laurent Pinchart]

Add a new macro to downcast an rcar_du_encoder pointer to a drm_encoder
pointer and use it. This prepares for the replacement of the
rcar_drm_encoder encoder field with a drm_slave_encoder.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas at ideasonboard.com>
---
 drivers/gpu/drm/rcar-du/rcar_du_encoder.c | 8 +++++---
 drivers/gpu/drm/rcar-du/rcar_du_encoder.h | 2 ++
 drivers/gpu/drm/rcar-du/rcar_du_lvdscon.c | 5 +++--
 drivers/gpu/drm/rcar-du/rcar_du_vgacon.c  | 5 +++--
 4 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c 
b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
index c699100..e88e63b 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
@@ -33,7 +33,7 @@ rcar_du_connector_best_encoder(struct drm_connector 
*connector)
 {
        struct rcar_du_connector *rcon = to_rcar_connector(connector);

-       return &rcon->encoder->encoder;
+       return rcar_encoder_to_drm_encoder(rcon->encoder);
 }

 /* 
-----------------------------------------------------------------------------
@@ -146,6 +146,7 @@ int rcar_du_encoder_init(struct rcar_du_device *rcdu,
                         struct device_node *con_node)
 {
        struct rcar_du_encoder *renc;
+       struct drm_encoder *encoder;
        unsigned int encoder_type;
        int ret;

@@ -154,6 +155,7 @@ int rcar_du_encoder_init(struct rcar_du_device *rcdu,
                return -ENOMEM;

        renc->output = output;
+       encoder = rcar_encoder_to_drm_encoder(renc);

        switch (output) {
        case RCAR_DU_OUTPUT_LVDS0:
@@ -182,12 +184,12 @@ int rcar_du_encoder_init(struct rcar_du_device *rcdu,
                break;
        }

-       ret = drm_encoder_init(rcdu->ddev, &renc->encoder, &encoder_funcs,
+       ret = drm_encoder_init(rcdu->ddev, encoder, &encoder_funcs,
                               encoder_type);
        if (ret < 0)
                return ret;

-       drm_encoder_helper_add(&renc->encoder, &encoder_helper_funcs);
+       drm_encoder_helper_add(encoder, &encoder_helper_funcs);

        switch (encoder_type) {
        case DRM_MODE_ENCODER_LVDS:
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_encoder.h 
b/drivers/gpu/drm/rcar-du/rcar_du_encoder.h
index 4b906b9..c6334b4 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_encoder.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_encoder.h
@@ -35,6 +35,8 @@ struct rcar_du_encoder {
 #define to_rcar_encoder(e) \
        container_of(e, struct rcar_du_encoder, encoder)

+#define rcar_encoder_to_drm_encoder(e) (&(e)->encoder)
+
 struct rcar_du_connector {
        struct drm_connector connector;
        struct rcar_du_encoder *encoder;
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_lvdscon.c 
b/drivers/gpu/drm/rcar-du/rcar_du_lvdscon.c
index 80dc021..6d9811c 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_lvdscon.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_lvdscon.c
@@ -84,6 +84,7 @@ int rcar_du_lvds_connector_init(struct rcar_du_device *rcdu,
                                struct rcar_du_encoder *renc,
                                /* TODO const */ struct device_node *np)
 {
+       struct drm_encoder *encoder = rcar_encoder_to_drm_encoder(renc);
        struct rcar_du_lvds_connector *lvdscon;
        struct drm_connector *connector;
        struct display_timing timing;
@@ -120,11 +121,11 @@ int rcar_du_lvds_connector_init(struct rcar_du_device 
*rcdu,
        drm_object_property_set_value(&connector->base,
                rcdu->ddev->mode_config.dpms_property, DRM_MODE_DPMS_OFF);

-       ret = drm_mode_connector_attach_encoder(connector, &renc->encoder);
+       ret = drm_mode_connector_attach_encoder(connector, encoder);
        if (ret < 0)
                return ret;

-       connector->encoder = &renc->encoder;
+       connector->encoder = encoder;
        lvdscon->connector.encoder = renc;

        return 0;
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_vgacon.c 
b/drivers/gpu/drm/rcar-du/rcar_du_vgacon.c
index 7807bb2..316108e 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_vgacon.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_vgacon.c
@@ -52,6 +52,7 @@ static const struct drm_connector_funcs connector_funcs = {
 int rcar_du_vga_connector_init(struct rcar_du_device *rcdu,
                               struct rcar_du_encoder *renc)
 {
+       struct drm_encoder *encoder = rcar_encoder_to_drm_encoder(renc);
        struct rcar_du_connector *rcon;
        struct drm_connector *connector;
        int ret;
@@ -78,11 +79,11 @@ int rcar_du_vga_connector_init(struct rcar_du_device *rcdu,
        drm_object_property_set_value(&connector->base,
                rcdu->ddev->mode_config.dpms_property, DRM_MODE_DPMS_OFF);

-       ret = drm_mode_connector_attach_encoder(connector, &renc->encoder);
+       ret = drm_mode_connector_attach_encoder(connector, encoder);
        if (ret < 0)
                return ret;

-       connector->encoder = &renc->encoder;
+       connector->encoder = encoder;
        rcon->encoder = renc;

        return 0;
-- 
1.8.5.5