Re: [RESEND PATCH v3 6/6] drm/ingenic: Attach bridge chain to encoders

From: Christophe Branchereau
Date: Fri Oct 29 2021 - 12:56:06 EST

Reviewed-by: Christophe Branchereau <cbranchereau@xxxxxxxxx>

On Tue, Oct 26, 2021 at 8:13 PM Paul Cercueil <paul@xxxxxxxxxxxxxxx> wrote:
>
> Attach a top-level bridge to each encoder, which will be used for
> negociating the bus format and flags.
>
> All the bridges are now attached with DRM_BRIDGE_ATTACH_NO_CONNECTOR.
>
> Signed-off-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/ingenic/ingenic-drm-drv.c | 92 +++++++++++++++++------
> 1 file changed, 70 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
> index a5e2880e07a1..a05a9fa6e115 100644
> --- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
> +++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
> @@ -21,6 +21,7 @@
> #include <drm/drm_atomic.h>
> #include <drm/drm_atomic_helper.h>
> #include <drm/drm_bridge.h>
> +#include <drm/drm_bridge_connector.h>
> #include <drm/drm_color_mgmt.h>
> #include <drm/drm_crtc.h>
> #include <drm/drm_crtc_helper.h>
> @@ -108,6 +109,19 @@ struct ingenic_drm {
> struct drm_private_obj private_obj;
> };
>
> +struct ingenic_drm_bridge {
> + struct drm_encoder encoder;
> + struct drm_bridge bridge, *next_bridge;
> +
> + struct drm_bus_cfg bus_cfg;
> +};
> +
> +static inline struct ingenic_drm_bridge *
> +to_ingenic_drm_bridge(struct drm_encoder *encoder)
> +{
> + return container_of(encoder, struct ingenic_drm_bridge, encoder);
> +}
> +
> static inline struct ingenic_drm_private_state *
> to_ingenic_drm_priv_state(struct drm_private_state *state)
> {
> @@ -668,11 +682,10 @@ static void ingenic_drm_encoder_atomic_mode_set(struct drm_encoder *encoder,
> {
> struct ingenic_drm *priv = drm_device_get_priv(encoder->dev);
> struct drm_display_mode *mode = &crtc_state->adjusted_mode;
> - struct drm_connector *conn = conn_state->connector;
> - struct drm_display_info *info = &conn->display_info;
> + struct ingenic_drm_bridge *bridge = to_ingenic_drm_bridge(encoder);
> unsigned int cfg, rgbcfg = 0;
>
> - priv->panel_is_sharp = info->bus_flags & DRM_BUS_FLAG_SHARP_SIGNALS;
> + priv->panel_is_sharp = bridge->bus_cfg.flags & DRM_BUS_FLAG_SHARP_SIGNALS;
>
> if (priv->panel_is_sharp) {
> cfg = JZ_LCD_CFG_MODE_SPECIAL_TFT_1 | JZ_LCD_CFG_REV_POLARITY;
> @@ -685,19 +698,19 @@ static void ingenic_drm_encoder_atomic_mode_set(struct drm_encoder *encoder,
> cfg |= JZ_LCD_CFG_HSYNC_ACTIVE_LOW;
> if (mode->flags & DRM_MODE_FLAG_NVSYNC)
> cfg |= JZ_LCD_CFG_VSYNC_ACTIVE_LOW;
> - if (info->bus_flags & DRM_BUS_FLAG_DE_LOW)
> + if (bridge->bus_cfg.flags & DRM_BUS_FLAG_DE_LOW)
> cfg |= JZ_LCD_CFG_DE_ACTIVE_LOW;
> - if (info->bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)
> + if (bridge->bus_cfg.flags & DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)
> cfg |= JZ_LCD_CFG_PCLK_FALLING_EDGE;
>
> if (!priv->panel_is_sharp) {
> - if (conn->connector_type == DRM_MODE_CONNECTOR_TV) {
> + if (conn_state->connector->connector_type == DRM_MODE_CONNECTOR_TV) {
> if (mode->flags & DRM_MODE_FLAG_INTERLACE)
> cfg |= JZ_LCD_CFG_MODE_TV_OUT_I;
> else
> cfg |= JZ_LCD_CFG_MODE_TV_OUT_P;
> } else {
> - switch (*info->bus_formats) {
> + switch (bridge->bus_cfg.format) {
> case MEDIA_BUS_FMT_RGB565_1X16:
> cfg |= JZ_LCD_CFG_MODE_GENERIC_16BIT;
> break;
> @@ -723,20 +736,29 @@ static void ingenic_drm_encoder_atomic_mode_set(struct drm_encoder *encoder,
> regmap_write(priv->map, JZ_REG_LCD_RGBC, rgbcfg);
> }
>
> -static int ingenic_drm_encoder_atomic_check(struct drm_encoder *encoder,
> - struct drm_crtc_state *crtc_state,
> - struct drm_connector_state *conn_state)
> +static int ingenic_drm_bridge_attach(struct drm_bridge *bridge,
> + enum drm_bridge_attach_flags flags)
> +{
> + struct ingenic_drm_bridge *ib = to_ingenic_drm_bridge(bridge->encoder);
> +
> + return drm_bridge_attach(bridge->encoder, ib->next_bridge,
> + &ib->bridge, flags);
> +}
> +
> +static int ingenic_drm_bridge_atomic_check(struct drm_bridge *bridge,
> + struct drm_bridge_state *bridge_state,
> + struct drm_crtc_state *crtc_state,
> + struct drm_connector_state *conn_state)
> {
> - struct drm_display_info *info = &conn_state->connector->display_info;
> struct drm_display_mode *mode = &crtc_state->adjusted_mode;
> + struct ingenic_drm_bridge *ib = to_ingenic_drm_bridge(bridge->encoder);
>
> - if (info->num_bus_formats != 1)
> - return -EINVAL;
> + ib->bus_cfg = bridge_state->output_bus_cfg;
>
> if (conn_state->connector->connector_type == DRM_MODE_CONNECTOR_TV)
> return 0;
>
> - switch (*info->bus_formats) {
> + switch (bridge_state->output_bus_cfg.format) {
> case MEDIA_BUS_FMT_RGB888_3X8:
> case MEDIA_BUS_FMT_RGB888_3X8_DELTA:
> /*
> @@ -900,8 +922,16 @@ static const struct drm_crtc_helper_funcs ingenic_drm_crtc_helper_funcs = {
> };
>
> static const struct drm_encoder_helper_funcs ingenic_drm_encoder_helper_funcs = {
> - .atomic_mode_set = ingenic_drm_encoder_atomic_mode_set,
> - .atomic_check = ingenic_drm_encoder_atomic_check,
> + .atomic_mode_set = ingenic_drm_encoder_atomic_mode_set,
> +};
> +
> +static const struct drm_bridge_funcs ingenic_drm_bridge_funcs = {
> + .attach = ingenic_drm_bridge_attach,
> + .atomic_check = ingenic_drm_bridge_atomic_check,
> + .atomic_reset = drm_atomic_helper_bridge_reset,
> + .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
> + .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
> + .atomic_get_input_bus_fmts = drm_atomic_helper_bridge_propagate_bus_fmt,
> };
>
> static const struct drm_mode_config_funcs ingenic_drm_mode_config_funcs = {
> @@ -976,7 +1006,9 @@ static int ingenic_drm_bind(struct device *dev, bool has_components)
> struct drm_plane *primary;
> struct drm_bridge *bridge;
> struct drm_panel *panel;
> + struct drm_connector *connector;
> struct drm_encoder *encoder;
> + struct ingenic_drm_bridge *ib;
> struct drm_device *drm;
> void __iomem *base;
> long parent_rate;
> @@ -1154,20 +1186,36 @@ static int ingenic_drm_bind(struct device *dev, bool has_components)
> bridge = devm_drm_panel_bridge_add_typed(dev, panel,
> DRM_MODE_CONNECTOR_DPI);
>
> - encoder = drmm_plain_encoder_alloc(drm, NULL, DRM_MODE_ENCODER_DPI, NULL);
> - if (IS_ERR(encoder)) {
> - ret = PTR_ERR(encoder);
> + ib = drmm_encoder_alloc(drm, struct ingenic_drm_bridge, encoder,
> + NULL, DRM_MODE_ENCODER_DPI, NULL);
> + if (IS_ERR(ib)) {
> + ret = PTR_ERR(ib);
> dev_err(dev, "Failed to init encoder: %d\n", ret);
> return ret;
> }
>
> - encoder->possible_crtcs = 1;
> + encoder = &ib->encoder;
> + encoder->possible_crtcs = drm_crtc_mask(&priv->crtc);
>
> drm_encoder_helper_add(encoder, &ingenic_drm_encoder_helper_funcs);
>
> - ret = drm_bridge_attach(encoder, bridge, NULL, 0);
> - if (ret)
> + ib->bridge.funcs = &ingenic_drm_bridge_funcs;
> + ib->next_bridge = bridge;
> +
> + ret = drm_bridge_attach(encoder, &ib->bridge, NULL,
> + DRM_BRIDGE_ATTACH_NO_CONNECTOR);
> + if (ret) {
> + dev_err(dev, "Unable to attach bridge\n");
> return ret;
> + }
> +
> + connector = drm_bridge_connector_init(drm, encoder);
> + if (IS_ERR(connector)) {
> + dev_err(dev, "Unable to init connector\n");
> + return PTR_ERR(connector);
> + }
> +
> + drm_connector_attach_encoder(connector, encoder);
> }
>
> drm_for_each_encoder(encoder, drm) {
> --
> 2.33.0
>