Hi Laurent,
On Wed, Dec 16, 2020 at 02:50:18AM +0200, Laurent Pinchart wrote:
> Replace the manual panel handling with usage of the DRM panel bridge
> helper. This simplifies the driver, and brings support for
> DRM_BRIDGE_ATTACH_NO_CONNECTOR as an added bonus.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/rcar-du/rcar_lvds.c | 120 +++-------------------------
> 1 file changed, 12 insertions(+), 108 deletions(-)
>
> diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c b/drivers/gpu/drm/rcar-du/rcar_lvds.c
> index 70dbbe44bb23..1b360e06658c 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_lvds.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_lvds.c
> @@ -63,7 +63,6 @@ struct rcar_lvds {
> struct drm_bridge bridge;
>
> struct drm_bridge *next_bridge;
> - struct drm_connector connector;
> struct drm_panel *panel;
>
> void __iomem *mmio;
> @@ -80,73 +79,11 @@ struct rcar_lvds {
> #define bridge_to_rcar_lvds(b) \
> container_of(b, struct rcar_lvds, bridge)
>
> -#define connector_to_rcar_lvds(c) \
> - container_of(c, struct rcar_lvds, connector)
> -
> static void rcar_lvds_write(struct rcar_lvds *lvds, u32 reg, u32 data)
> {
> iowrite32(data, lvds->mmio + reg);
> }
>
> -/* -----------------------------------------------------------------------------
> - * Connector & Panel
> - */
> -
> -static int rcar_lvds_connector_get_modes(struct drm_connector *connector)
> -{
> - struct rcar_lvds *lvds = connector_to_rcar_lvds(connector);
> -
> - return drm_panel_get_modes(lvds->panel, connector);
> -}
> -
> -static int rcar_lvds_connector_atomic_check(struct drm_connector *connector,
> - struct drm_atomic_state *state)
> -{
> - struct rcar_lvds *lvds = connector_to_rcar_lvds(connector);
> - const struct drm_display_mode *panel_mode;
> - struct drm_connector_state *conn_state;
> - struct drm_crtc_state *crtc_state;
> -
> - conn_state = drm_atomic_get_new_connector_state(state, connector);
> - if (!conn_state->crtc)
> - return 0;
> -
> - if (list_empty(&connector->modes)) {
> - dev_dbg(lvds->dev, "connector: empty modes list\n");
> - return -EINVAL;
> - }
> -
> - panel_mode = list_first_entry(&connector->modes,
> - struct drm_display_mode, head);
> -
> - /* We're not allowed to modify the resolution. */
> - crtc_state = drm_atomic_get_crtc_state(state, conn_state->crtc);
> - if (IS_ERR(crtc_state))
> - return PTR_ERR(crtc_state);
> -
> - if (crtc_state->mode.hdisplay != panel_mode->hdisplay ||
> - crtc_state->mode.vdisplay != panel_mode->vdisplay)
> - return -EINVAL;
> -
> - /* The flat panel mode is fixed, just copy it to the adjusted mode. */
> - drm_mode_copy(&crtc_state->adjusted_mode, panel_mode);
> -
> - return 0;
> -}
> -
> -static const struct drm_connector_helper_funcs rcar_lvds_conn_helper_funcs = {
> - .get_modes = rcar_lvds_connector_get_modes,
> - .atomic_check = rcar_lvds_connector_atomic_check,
> -};
> -
> -static const struct drm_connector_funcs rcar_lvds_conn_funcs = {
> - .reset = drm_atomic_helper_connector_reset,
> - .fill_modes = drm_helper_probe_single_connector_modes,
> - .destroy = drm_connector_cleanup,
> - .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> - .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> -};
> -
> /* -----------------------------------------------------------------------------
> * PLL Setup
> */
> @@ -583,11 +520,6 @@ static void __rcar_lvds_atomic_enable(struct drm_bridge *bridge,
> /* Turn the output on. */
> lvdcr0 |= LVDCR0_LVRES;
> rcar_lvds_write(lvds, LVDCR0, lvdcr0);
> -
> - if (lvds->panel) {
> - drm_panel_prepare(lvds->panel);
> - drm_panel_enable(lvds->panel);
> - }
> }
>
> static void rcar_lvds_atomic_enable(struct drm_bridge *bridge,
> @@ -609,11 +541,6 @@ static void rcar_lvds_atomic_disable(struct drm_bridge *bridge,
> {
> struct rcar_lvds *lvds = bridge_to_rcar_lvds(bridge);
>
> - if (lvds->panel) {
> - drm_panel_disable(lvds->panel);
> - drm_panel_unprepare(lvds->panel);
> - }
> -
> rcar_lvds_write(lvds, LVDCR0, 0);
> rcar_lvds_write(lvds, LVDCR1, 0);
> rcar_lvds_write(lvds, LVDPLLCR, 0);
> @@ -648,45 +575,13 @@ static int rcar_lvds_attach(struct drm_bridge *bridge,
> enum drm_bridge_attach_flags flags)
> {
> struct rcar_lvds *lvds = bridge_to_rcar_lvds(bridge);
> - struct drm_connector *connector = &lvds->connector;
> - struct drm_encoder *encoder = bridge->encoder;
> - int ret;
>
> - /* If we have a next bridge just attach it. */
> - if (lvds->next_bridge)
> - return drm_bridge_attach(bridge->encoder, lvds->next_bridge,
> - bridge, flags);
> -
> - if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
> - DRM_ERROR("Fix bridge driver to make connector optional!");
> - return -EINVAL;
> - }
> -
> - /* Otherwise if we have a panel, create a connector. */
> - if (!lvds->panel)
> - return 0;
> -
> - ret = drm_connector_init(bridge->dev, connector, &rcar_lvds_conn_funcs,
> - DRM_MODE_CONNECTOR_LVDS);
> - if (ret < 0)
> - return ret;
> -
> - drm_connector_helper_add(connector, &rcar_lvds_conn_helper_funcs);
> -
> - ret = drm_connector_attach_encoder(connector, encoder);
> - if (ret < 0)
> - return ret;
> -
> - return 0;
> -}
> -
> -static void rcar_lvds_detach(struct drm_bridge *bridge)
> -{
> + return drm_bridge_attach(bridge->encoder, lvds->next_bridge, bridge,
> + flags);
> }
>
> static const struct drm_bridge_funcs rcar_lvds_bridge_ops = {
> .attach = rcar_lvds_attach,
> - .detach = rcar_lvds_detach,
> .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
> .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
> .atomic_reset = drm_atomic_helper_bridge_reset,
> @@ -759,7 +654,7 @@ static int rcar_lvds_parse_dt_companion(struct rcar_lvds *lvds)
> * that we are expected to generate even pixels from the primary
> * encoder, and odd pixels from the companion encoder.
> */
> - if (lvds->next_bridge && lvds->next_bridge->timings &&
> + if (lvds->next_bridge->timings &&
> lvds->next_bridge->timings->dual_link)
> lvds->link_type = RCAR_LVDS_DUAL_LINK_EVEN_ODD_PIXELS;
> else
> @@ -811,6 +706,15 @@ static int rcar_lvds_parse_dt(struct rcar_lvds *lvds)
> if (ret)
> goto done;
>
> + if (lvds->panel) {
> + lvds->next_bridge = devm_drm_panel_bridge_add(lvds->dev,
> + lvds->panel);
Reading the devm_drm_panel_bridge_add() function documentation:
* devm_drm_panel_bridge_add - Creates a managed &drm_bridge and &drm_connector
Doesn't this conflict with the drm_bridge_connector_init() called by
the encoder in [4/4] ?
> + if (IS_ERR_OR_NULL(lvds->next_bridge)) {
> + ret = -EINVAL;
> + goto done;
> + }
> + }
> +
> if (lvds->info->quirks & RCAR_LVDS_QUIRK_DUAL_LINK)
> ret = rcar_lvds_parse_dt_companion(lvds);
>
> --
> Regards,
>
> Laurent Pinchart
>
