On Mon, 18 May 2020 19:39:08 +0200
Enric Balletbo i Serra <enric.balle...@collabora.com> wrote:
> Convert mtk_dpi to a bridge driver with built-in encoder support for
> compatibility with existing component drivers.
>
> Signed-off-by: Enric Balletbo i Serra <enric.balle...@collabora.com>
> Reviewed-by: Chun-Kuang Hu <chunkuang...@kernel.org>
> ---
>
> drivers/gpu/drm/mediatek/mtk_dpi.c | 66 +++++++++++++++---------------
> 1 file changed, 34 insertions(+), 32 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c
> b/drivers/gpu/drm/mediatek/mtk_dpi.c
> index 7112125dc3d1..baad198c69eb 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
> @@ -61,6 +61,7 @@ enum mtk_dpi_out_color_format {
> struct mtk_dpi {
> struct mtk_ddp_comp ddp_comp;
> struct drm_encoder encoder;
> + struct drm_bridge bridge;
> struct drm_bridge *next_bridge;
> void __iomem *regs;
> struct device *dev;
> @@ -77,9 +78,9 @@ struct mtk_dpi {
> int refcount;
> };
>
> -static inline struct mtk_dpi *mtk_dpi_from_encoder(struct drm_encoder *e)
> +static inline struct mtk_dpi *bridge_to_dpi(struct drm_bridge *b)
> {
> - return container_of(e, struct mtk_dpi, encoder);
> + return container_of(b, struct mtk_dpi, bridge);
> }
>
> enum mtk_dpi_polarity {
> @@ -518,50 +519,44 @@ static const struct drm_encoder_funcs
> mtk_dpi_encoder_funcs = {
> .destroy = mtk_dpi_encoder_destroy,
> };
>
> -static bool mtk_dpi_encoder_mode_fixup(struct drm_encoder *encoder,
> - const struct drm_display_mode *mode,
> - struct drm_display_mode *adjusted_mode)
> +static int mtk_dpi_bridge_attach(struct drm_bridge *bridge,
> + enum drm_bridge_attach_flags flags)
> {
> - return true;
> + struct mtk_dpi *dpi = bridge_to_dpi(bridge);
> +
> + return drm_bridge_attach(bridge->encoder, dpi->next_bridge,
> + &dpi->bridge, flags);
> }
>
> -static void mtk_dpi_encoder_mode_set(struct drm_encoder *encoder,
> - struct drm_display_mode *mode,
> - struct drm_display_mode *adjusted_mode)
> +static void mtk_dpi_bridge_mode_set(struct drm_bridge *bridge,
> + const struct drm_display_mode *mode,
> + const struct drm_display_mode *adjusted_mode)
> {
> - struct mtk_dpi *dpi = mtk_dpi_from_encoder(encoder);
> + struct mtk_dpi *dpi = bridge_to_dpi(bridge);
>
> drm_mode_copy(&dpi->mode, adjusted_mode);
> }
>
> -static void mtk_dpi_encoder_disable(struct drm_encoder *encoder)
> +static void mtk_dpi_bridge_disable(struct drm_bridge *bridge)
> {
> - struct mtk_dpi *dpi = mtk_dpi_from_encoder(encoder);
> + struct mtk_dpi *dpi = bridge_to_dpi(bridge);
>
> mtk_dpi_power_off(dpi);
> }
>
> -static void mtk_dpi_encoder_enable(struct drm_encoder *encoder)
> +static void mtk_dpi_bridge_enable(struct drm_bridge *bridge)
> {
> - struct mtk_dpi *dpi = mtk_dpi_from_encoder(encoder);
> + struct mtk_dpi *dpi = bridge_to_dpi(bridge);
>
> mtk_dpi_power_on(dpi);
> mtk_dpi_set_display_mode(dpi, &dpi->mode);
> }
>
> -static int mtk_dpi_atomic_check(struct drm_encoder *encoder,
> - struct drm_crtc_state *crtc_state,
> - struct drm_connector_state *conn_state)
> -{
> - return 0;
> -}
> -
> -static const struct drm_encoder_helper_funcs mtk_dpi_encoder_helper_funcs = {
> - .mode_fixup = mtk_dpi_encoder_mode_fixup,
> - .mode_set = mtk_dpi_encoder_mode_set,
> - .disable = mtk_dpi_encoder_disable,
> - .enable = mtk_dpi_encoder_enable,
> - .atomic_check = mtk_dpi_atomic_check,
> +static const struct drm_bridge_funcs mtk_dpi_bridge_funcs = {
> + .attach = mtk_dpi_bridge_attach,
> + .mode_set = mtk_dpi_bridge_mode_set,
> + .disable = mtk_dpi_bridge_disable,
> + .enable = mtk_dpi_bridge_enable,
> };
>
> static void mtk_dpi_start(struct mtk_ddp_comp *comp)
> @@ -602,16 +597,13 @@ static int mtk_dpi_bind(struct device *dev, struct
> device *master, void *data)
> dev_err(dev, "Failed to initialize decoder: %d\n", ret);
> goto err_unregister;
> }
> - drm_encoder_helper_add(&dpi->encoder, &mtk_dpi_encoder_helper_funcs);
>
> /* Currently DPI0 is fixed to be driven by OVL1 */
> dpi->encoder.possible_crtcs = BIT(1);
>
> - ret = drm_bridge_attach(&dpi->encoder, dpi->next_bridge, NULL, 0);
> - if (ret) {
> - dev_err(dev, "Failed to attach bridge: %d\n", ret);
Any reason your decided to drop this error message? If there's one,
this should probably happen in a separate patch.
> + ret = drm_bridge_attach(&dpi->encoder, &dpi->bridge, NULL, 0);
> + if (ret)
> goto err_cleanup;
> - }
>
> dpi->bit_num = MTK_DPI_OUT_BIT_NUM_8BITS;
> dpi->channel_swap = MTK_DPI_OUT_CHANNEL_SWAP_RGB;
> @@ -768,8 +760,15 @@ static int mtk_dpi_probe(struct platform_device *pdev)
>
> platform_set_drvdata(pdev, dpi);
>
> + dpi->bridge.funcs = &mtk_dpi_bridge_funcs;
> + dpi->bridge.of_node = dev->of_node;
> + dpi->bridge.type = DRM_MODE_CONNECTOR_DPI;
> +
> + drm_bridge_add(&dpi->bridge);
I wonder if it's really useful to add the bridge when it's private (you
don't want this bridge to be added to external bridge chains).
> +
> ret = component_add(dev, &mtk_dpi_component_ops);
> if (ret) {
> + drm_bridge_remove(&dpi->bridge);
> dev_err(dev, "Failed to add component: %d\n", ret);
> return ret;
> }
> @@ -779,7 +778,10 @@ static int mtk_dpi_probe(struct platform_device *pdev)
>
> static int mtk_dpi_remove(struct platform_device *pdev)
> {
> + struct mtk_dpi *dpi = platform_get_drvdata(pdev);
> +
> component_del(&pdev->dev, &mtk_dpi_component_ops);
> + drm_bridge_remove(&dpi->bridge);
>
> return 0;
> }
