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SubjectRe: [PATCH v4 3/4] drm: sun4i: dsi: Convert to bridge driver
Hi Jagan,

Thank you for the patch.

On Mon, Mar 22, 2021 at 07:31:51PM +0530, Jagan Teki wrote:
> DRM bridge drivers have build-in handling of treating all display
> pipeline components as bridges.
>
> So, convert the existing to a drm bridge driver with a built-in
> encoder support for compatibility with existing component drivers.

It would be best if possible to move this patch before 2/4, to first
convert to the bridge model, and then build on top of it.

> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> ---
> Changes for v4:
> - none
> Changes for v3:
> - new patch
>
> drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 75 ++++++++++++++++----------
> drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h | 6 +++
> 2 files changed, 54 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> index 39321299dc27..6f3c5330a468 100644
> --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> @@ -714,10 +714,10 @@ static int sun6i_dsi_start(struct sun6i_dsi *dsi,
> return 0;
> }
>
> -static void sun6i_dsi_encoder_enable(struct drm_encoder *encoder)
> +static void sun6i_dsi_bridge_enable(struct drm_bridge *bridge)
> {
> - struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
> - struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
> + struct drm_display_mode *mode = &bridge->encoder->crtc->state->adjusted_mode;
> + struct sun6i_dsi *dsi = bridge_to_sun6i_dsi(bridge);
> struct mipi_dsi_device *device = dsi->device;
> union phy_configure_opts opts = { };
> struct phy_configure_opts_mipi_dphy *cfg = &opts.mipi_dphy;
> @@ -801,9 +801,9 @@ static void sun6i_dsi_encoder_enable(struct drm_encoder *encoder)
> sun6i_dsi_start(dsi, DSI_START_HSD);
> }
>
> -static void sun6i_dsi_encoder_disable(struct drm_encoder *encoder)
> +static void sun6i_dsi_bridge_disable(struct drm_bridge *bridge)
> {
> - struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
> + struct sun6i_dsi *dsi = bridge_to_sun6i_dsi(bridge);
>
> DRM_DEBUG_DRIVER("Disabling DSI output\n");
>
> @@ -852,9 +852,40 @@ static const struct drm_connector_funcs sun6i_dsi_connector_funcs = {
> .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> };
>
> -static const struct drm_encoder_helper_funcs sun6i_dsi_enc_helper_funcs = {
> - .disable = sun6i_dsi_encoder_disable,
> - .enable = sun6i_dsi_encoder_enable,
> +static int sun6i_dsi_bridge_attach(struct drm_bridge *bridge,
> + enum drm_bridge_attach_flags flags)
> +{
> + struct sun6i_dsi *dsi = bridge_to_sun6i_dsi(bridge);
> + int ret;
> +
> + if (dsi->panel_bridge)
> + return drm_bridge_attach(bridge->encoder, dsi->panel_bridge, NULL, 0);
> +
> + if (dsi->panel) {
> + drm_connector_helper_add(&dsi->connector,
> + &sun6i_dsi_connector_helper_funcs);
> + ret = drm_connector_init(bridge->dev, &dsi->connector,
> + &sun6i_dsi_connector_funcs,
> + DRM_MODE_CONNECTOR_DSI);
> + if (ret) {
> + dev_err(dsi->dev, "Couldn't initialise the DSI connector\n");
> + goto err_cleanup_connector;
> + }
> +
> + drm_connector_attach_encoder(&dsi->connector, &dsi->encoder);
> + }
> +
> + return 0;
> +
> +err_cleanup_connector:
> + drm_encoder_cleanup(&dsi->encoder);
> + return ret;
> +}
> +
> +static const struct drm_bridge_funcs sun6i_dsi_bridge_funcs = {
> + .enable = sun6i_dsi_bridge_enable,
> + .disable = sun6i_dsi_bridge_disable,
> + .attach = sun6i_dsi_bridge_attach,
> };
>
> static u32 sun6i_dsi_dcs_build_pkt_hdr(struct sun6i_dsi *dsi,
> @@ -1063,8 +1094,6 @@ static int sun6i_dsi_bind(struct device *dev, struct device *master,
> struct sun6i_dsi *dsi = dev_get_drvdata(dev);
> int ret;
>
> - drm_encoder_helper_add(&dsi->encoder,
> - &sun6i_dsi_enc_helper_funcs);
> ret = drm_simple_encoder_init(drm, &dsi->encoder,
> DRM_MODE_ENCODER_DSI);
> if (ret) {
> @@ -1073,27 +1102,12 @@ static int sun6i_dsi_bind(struct device *dev, struct device *master,
> }
> dsi->encoder.possible_crtcs = BIT(0);
>
> - drm_connector_helper_add(&dsi->connector,
> - &sun6i_dsi_connector_helper_funcs);
> - ret = drm_connector_init(drm, &dsi->connector,
> - &sun6i_dsi_connector_funcs,
> - DRM_MODE_CONNECTOR_DSI);
> + ret = drm_bridge_attach(&dsi->encoder, &dsi->bridge, NULL, 0);
> if (ret) {
> - dev_err(dsi->dev,
> - "Couldn't initialise the DSI connector\n");
> + dev_err(dsi->dev, "Couldn't attach drm bridge\n");
> goto err_cleanup_connector;
> }
>
> - drm_connector_attach_encoder(&dsi->connector, &dsi->encoder);
> -
> - if (dsi->panel_bridge) {
> - ret = drm_bridge_attach(&dsi->encoder, dsi->panel_bridge, NULL, 0);
> - if (ret) {
> - dev_err(dsi->dev, "Couldn't attach drm bridge\n");
> - goto err_cleanup_connector;
> - }
> - }
> -
> return 0;
>
> err_cleanup_connector:
> @@ -1199,6 +1213,12 @@ static int sun6i_dsi_probe(struct platform_device *pdev)
> goto err_unprotect_clk;
> }
>
> + dsi->bridge.funcs = &sun6i_dsi_bridge_funcs;
> + dsi->bridge.of_node = dev->of_node;
> + dsi->bridge.type = DRM_MODE_CONNECTOR_DSI;
> +
> + drm_bridge_add(&dsi->bridge);
> +
> ret = component_add(&pdev->dev, &sun6i_dsi_ops);
> if (ret) {
> dev_err(dev, "Couldn't register our component\n");
> @@ -1222,6 +1242,7 @@ static int sun6i_dsi_remove(struct platform_device *pdev)
> struct device *dev = &pdev->dev;
> struct sun6i_dsi *dsi = dev_get_drvdata(dev);
>
> + drm_bridge_remove(&dsi->bridge);
> component_del(&pdev->dev, &sun6i_dsi_ops);
> mipi_dsi_host_unregister(&dsi->host);
> clk_rate_exclusive_put(dsi->mod_clk);
> diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
> index 370ecb356a63..5e70666089ad 100644
> --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
> +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.h
> @@ -16,6 +16,7 @@
> #define SUN6I_DSI_TCON_DIV 4
>
> struct sun6i_dsi {
> + struct drm_bridge bridge;
> struct drm_connector connector;
> struct drm_encoder encoder;

The drm_encoder should be dropped from this driver, the encoder should
be created by the main display driver.

> struct mipi_dsi_host host;
> @@ -38,6 +39,11 @@ static inline struct sun6i_dsi *host_to_sun6i_dsi(struct mipi_dsi_host *host)
> return container_of(host, struct sun6i_dsi, host);
> };
>
> +static inline struct sun6i_dsi *bridge_to_sun6i_dsi(struct drm_bridge *bridge)
> +{
> + return container_of(bridge, struct sun6i_dsi, bridge);
> +}
> +
> static inline struct sun6i_dsi *connector_to_sun6i_dsi(struct drm_connector *connector)
> {
> return container_of(connector, struct sun6i_dsi, connector);

--
Regards,

Laurent Pinchart

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