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Message-ID: <CAAOTY_-nzdS-jg2pgpM1ksrsQVewB2AEB8TihHcCB-MJd+qFfw@mail.gmail.com>
Date: Fri, 1 May 2020 21:21:48 +0800
From: Chun-Kuang Hu <chunkuang.hu@...nel.org>
To: Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc: linux-kernel <linux-kernel@...r.kernel.org>,
Collabora Kernel ML <kernel@...labora.com>,
Matthias Brugger <matthias.bgg@...il.com>,
Nicolas Boichat <drinkcat@...omium.org>,
Hsin-Yi Wang <hsinyi@...omium.org>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Chun-Kuang Hu <chunkuang.hu@...nel.org>,
Daniel Vetter <daniel@...ll.ch>,
David Airlie <airlied@...ux.ie>,
Philipp Zabel <p.zabel@...gutronix.de>,
DRI Development <dri-devel@...ts.freedesktop.org>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v3 4/7] drm/mediatek: mtk_dsi: Convert to bridge driver
Hi, Enric:
Enric Balletbo i Serra <enric.balletbo@...labora.com> 於 2020年4月17日 週五 下午11:06寫道：
>
> Convert mtk_dsi to a bridge driver with built-in encoder support for
> compatibility with existing component drivers.
>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> ---
>
> Changes in v3:
> - Add the bridge.type. (Laurent Pinchart)
>
> Changes in v2: None
>
> drivers/gpu/drm/mediatek/mtk_dsi.c | 93 ++++++++++++++++++++++--------
> 1 file changed, 69 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index 37b8d7ffd835..869ae0a2e9f8 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -180,6 +180,7 @@ struct mtk_dsi {
> struct device *dev;
> struct mipi_dsi_host host;
> struct drm_encoder encoder;
> + struct drm_bridge bridge;
> struct drm_connector conn;
> struct drm_panel *panel;
> struct drm_bridge *next_bridge;
> @@ -205,9 +206,9 @@ struct mtk_dsi {
> const struct mtk_dsi_driver_data *driver_data;
> };
>
> -static inline struct mtk_dsi *encoder_to_dsi(struct drm_encoder *e)
> +static inline struct mtk_dsi *bridge_to_dsi(struct drm_bridge *b)
> {
> - return container_of(e, struct mtk_dsi, encoder);
> + return container_of(b, struct mtk_dsi, bridge);
> }
>
> static inline struct mtk_dsi *connector_to_dsi(struct drm_connector *c)
> @@ -796,32 +797,43 @@ static const struct drm_encoder_funcs mtk_dsi_encoder_funcs = {
> .destroy = mtk_dsi_encoder_destroy,
> };
>
> -static bool mtk_dsi_encoder_mode_fixup(struct drm_encoder *encoder,
> - const struct drm_display_mode *mode,
> - struct drm_display_mode *adjusted_mode)
> +static int mtk_dsi_create_conn_enc(struct drm_device *drm, struct mtk_dsi *dsi);
> +static void mtk_dsi_destroy_conn_enc(struct mtk_dsi *dsi);
> +
> +static int mtk_dsi_bridge_attach(struct drm_bridge *bridge,
> + enum drm_bridge_attach_flags flags)
> +{
> + struct mtk_dsi *dsi = bridge_to_dsi(bridge);
> +
> + return mtk_dsi_create_conn_enc(bridge->dev, dsi);
> +}
> +
> +static void mtk_dsi_bridge_detach(struct drm_bridge *bridge)
> {
> - return true;
> + struct mtk_dsi *dsi = bridge_to_dsi(bridge);
> +
> + mtk_dsi_destroy_conn_enc(dsi);
> }
>
> -static void mtk_dsi_encoder_mode_set(struct drm_encoder *encoder,
> - struct drm_display_mode *mode,
> - struct drm_display_mode *adjusted)
> +static void mtk_dsi_bridge_mode_set(struct drm_bridge *bridge,
> + const struct drm_display_mode *mode,
> + const struct drm_display_mode *adjusted)
> {
> - struct mtk_dsi *dsi = encoder_to_dsi(encoder);
> + struct mtk_dsi *dsi = bridge_to_dsi(bridge);
>
> drm_display_mode_to_videomode(adjusted, &dsi->vm);
> }
>
> -static void mtk_dsi_encoder_disable(struct drm_encoder *encoder)
> +static void mtk_dsi_bridge_disable(struct drm_bridge *bridge)
> {
> - struct mtk_dsi *dsi = encoder_to_dsi(encoder);
> + struct mtk_dsi *dsi = bridge_to_dsi(bridge);
>
> mtk_output_dsi_disable(dsi);
> }
>
> -static void mtk_dsi_encoder_enable(struct drm_encoder *encoder)
> +static void mtk_dsi_bridge_enable(struct drm_bridge *bridge)
> {
> - struct mtk_dsi *dsi = encoder_to_dsi(encoder);
> + struct mtk_dsi *dsi = bridge_to_dsi(bridge);
>
> mtk_output_dsi_enable(dsi);
> }
> @@ -833,11 +845,12 @@ static int mtk_dsi_connector_get_modes(struct drm_connector *connector)
> return drm_panel_get_modes(dsi->panel, connector);
> }
>
> -static const struct drm_encoder_helper_funcs mtk_dsi_encoder_helper_funcs = {
> - .mode_fixup = mtk_dsi_encoder_mode_fixup,
> - .mode_set = mtk_dsi_encoder_mode_set,
> - .disable = mtk_dsi_encoder_disable,
> - .enable = mtk_dsi_encoder_enable,
> +static const struct drm_bridge_funcs mtk_dsi_bridge_funcs = {
> + .attach = mtk_dsi_bridge_attach,
> + .detach = mtk_dsi_bridge_detach,
> + .disable = mtk_dsi_bridge_disable,
> + .enable = mtk_dsi_bridge_enable,
> + .mode_set = mtk_dsi_bridge_mode_set,
> };
>
> static const struct drm_connector_funcs mtk_dsi_connector_funcs = {
> @@ -1123,6 +1136,34 @@ static const struct mipi_dsi_host_ops mtk_dsi_ops = {
> .transfer = mtk_dsi_host_transfer,
> };
>
> +static int mtk_dsi_encoder_init(struct drm_device *drm, struct mtk_dsi *dsi)
> +{
> + int ret;
> +
> + ret = drm_encoder_init(drm, &dsi->encoder, &mtk_dsi_encoder_funcs,
> + DRM_MODE_ENCODER_DSI, NULL);
I'm a bit confused here. drm_encoder_init() exist here and in
mtk_dsi_create_conn_enc(). Do you plan to init encodr twice?
> + if (ret) {
> + DRM_ERROR("Failed to encoder init to drm\n");
> + return ret;
> + }
> +
> + /*
> + * Currently display data paths are statically assigned to a crtc each.
> + * crtc 0 is OVL0 -> COLOR0 -> AAL -> OD -> RDMA0 -> UFOE -> DSI0
> + */
> + dsi->encoder.possible_crtcs = 1;
> +
> + ret = drm_bridge_attach(&dsi->encoder, &dsi->bridge, NULL, 0);
> + if (ret)
> + goto err_cleanup_encoder;
> +
> + return 0;
> +
> +err_cleanup_encoder:
> + drm_encoder_cleanup(&dsi->encoder);
> + return ret;
> +}
> +
> static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)
> {
> int ret;
> @@ -1136,11 +1177,9 @@ static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)
> return ret;
> }
>
> - ret = mtk_dsi_create_conn_enc(drm, dsi);
> - if (ret) {
> - DRM_ERROR("Encoder create failed with %d\n", ret);
> + ret = mtk_dsi_encoder_init(drm, dsi);
> + if (ret)
> goto err_unregister;
> - }
>
> return 0;
>
> @@ -1155,7 +1194,6 @@ static void mtk_dsi_unbind(struct device *dev, struct device *master,
> struct drm_device *drm = data;
> struct mtk_dsi *dsi = dev_get_drvdata(dev);
>
> - mtk_dsi_destroy_conn_enc(dsi);
There is mtk_dsi_encoder_init() in bind(), why no mtk_dsi_encoder_uninit() here?
Regards,
Chun-Kuang.
> mtk_ddp_comp_unregister(drm, &dsi->ddp_comp);
> }
>
> @@ -1265,6 +1303,12 @@ static int mtk_dsi_probe(struct platform_device *pdev)
>
> platform_set_drvdata(pdev, dsi);
>
> + dsi->bridge.funcs = &mtk_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, &mtk_dsi_component_ops);
> if (ret) {
> dev_err(&pdev->dev, "failed to add component: %d\n", ret);
> @@ -1283,6 +1327,7 @@ static int mtk_dsi_remove(struct platform_device *pdev)
> struct mtk_dsi *dsi = platform_get_drvdata(pdev);
>
> mtk_output_dsi_disable(dsi);
> + drm_bridge_remove(&dsi->bridge);
> component_del(&pdev->dev, &mtk_dsi_component_ops);
> mipi_dsi_host_unregister(&dsi->host);
>
> --
> 2.25.1
>
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