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Message-ID: <YGJr+jopSvH4SdsL@pendragon.ideasonboard.com>
Date: Tue, 30 Mar 2021 03:08:26 +0300
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Dafna Hirschfeld <dafna.hirschfeld@...labora.com>
Cc: dri-devel@...ts.freedesktop.org,
linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
kernel@...labora.com, dafna3@...il.com, chunkuang.hu@...nel.org,
p.zabel@...gutronix.de, airlied@...ux.ie, daniel@...ll.ch,
enric.balletbo@...labora.com
Subject: Re: [PATCH v2 2/3] drm/mediatek: Don't support hdmi connector
creation
Hi Dafna,
Thank you for the patch.
On Mon, Mar 29, 2021 at 05:36:31PM +0200, Dafna Hirschfeld wrote:
> commit f01195148967 ("drm/mediatek: mtk_dpi: Create connector for bridges")
> broke the display support for elm device since mtk_dpi calls
> drm_bridge_attach with the flag DRM_BRIDGE_ATTACH_NO_CONNECTOR
> while mtk_hdmi does not yet support this flag.
>
> Fix this by accepting DRM_BRIDGE_ATTACH_NO_CONNECTOR in bridge attachment.
> Implement the drm_bridge_funcs .detect() and .get_edid() operations, and
> call drm_bridge_hpd_notify() to report HPD. This provides the
> necessary API to support disabling connector creation.
>
> This patch is inspired by a similar patch for bridge/synopsys/dw-hdmi.c:
> commit ec971aaa6775 ("drm: bridge: dw-hdmi: Make connector creation optional")
> But with the difference that in mtk-hdmi only the option of not creating
> a connector is supported.
>
> Fixes: f01195148967 ("drm/mediatek: mtk_dpi: Create connector for bridges")
> Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@...labora.com>
> ---
> drivers/gpu/drm/mediatek/mtk_hdmi.c | 129 ++++++++++------------------
> 1 file changed, 44 insertions(+), 85 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> index f2c810b767ef..1eeb211b1536 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> @@ -186,11 +186,6 @@ static inline struct mtk_hdmi *hdmi_ctx_from_bridge(struct drm_bridge *b)
> return container_of(b, struct mtk_hdmi, bridge);
> }
>
> -static inline struct mtk_hdmi *hdmi_ctx_from_conn(struct drm_connector *c)
> -{
> - return container_of(c, struct mtk_hdmi, conn);
> -}
> -
> static u32 mtk_hdmi_read(struct mtk_hdmi *hdmi, u32 offset)
> {
> return readl(hdmi->regs + offset);
> @@ -1201,48 +1196,30 @@ mtk_hdmi_update_plugged_status(struct mtk_hdmi *hdmi)
> connector_status_connected : connector_status_disconnected;
> }
>
> -static enum drm_connector_status hdmi_conn_detect(struct drm_connector *conn,
> - bool force)
> -{
> - struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
> - return mtk_hdmi_update_plugged_status(hdmi);
> -}
> -
> -static void hdmi_conn_destroy(struct drm_connector *conn)
> +static struct edid *mtk_hdmi_get_edid(struct mtk_hdmi *hdmi,
> + struct drm_connector *connector)
> {
> - struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
> -
> - mtk_cec_set_hpd_event(hdmi->cec_dev, NULL, NULL);
> -
> - drm_connector_cleanup(conn);
> -}
> -
> -static int mtk_hdmi_conn_get_modes(struct drm_connector *conn)
> -{
> - struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
> struct edid *edid;
> - int ret;
>
> if (!hdmi->ddc_adpt)
> - return -ENODEV;
> -
> - edid = drm_get_edid(conn, hdmi->ddc_adpt);
> + return NULL;
> + edid = drm_get_edid(connector, hdmi->ddc_adpt);
> if (!edid)
> - return -ENODEV;
> -
> + return NULL;
> hdmi->dvi_mode = !drm_detect_monitor_audio(edid);
> + return edid;
> +}
>
> - drm_connector_update_edid_property(conn, edid);
> -
> - ret = drm_add_edid_modes(conn, edid);
> - kfree(edid);
> - return ret;
> +static enum drm_connector_status mtk_hdmi_detect(struct mtk_hdmi *hdmi)
> +{
> + return mtk_hdmi_update_plugged_status(hdmi);
> }
>
> -static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
> - struct drm_display_mode *mode)
> +static int mtk_hdmi_bridge_mode_valid(struct drm_bridge *bridge,
> + const struct drm_display_info *info,
> + const struct drm_display_mode *mode)
> {
> - struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
> + struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
> struct drm_bridge *next_bridge;
>
> dev_dbg(hdmi->dev, "xres=%d, yres=%d, refresh=%d, intl=%d clock=%d\n",
> @@ -1267,74 +1244,50 @@ static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
> return drm_mode_validate_size(mode, 0x1fff, 0x1fff);
> }
>
> -static struct drm_encoder *mtk_hdmi_conn_best_enc(struct drm_connector *conn)
> -{
> - struct mtk_hdmi *hdmi = hdmi_ctx_from_conn(conn);
> -
> - return hdmi->bridge.encoder;
> -}
> -
> -static const struct drm_connector_funcs mtk_hdmi_connector_funcs = {
> - .detect = hdmi_conn_detect,
> - .fill_modes = drm_helper_probe_single_connector_modes,
> - .destroy = hdmi_conn_destroy,
> - .reset = drm_atomic_helper_connector_reset,
> - .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> - .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> -};
> -
> -static const struct drm_connector_helper_funcs
> - mtk_hdmi_connector_helper_funcs = {
> - .get_modes = mtk_hdmi_conn_get_modes,
> - .mode_valid = mtk_hdmi_conn_mode_valid,
> - .best_encoder = mtk_hdmi_conn_best_enc,
> -};
> -
> static void mtk_hdmi_hpd_event(bool hpd, struct device *dev)
> {
> struct mtk_hdmi *hdmi = dev_get_drvdata(dev);
>
> - if (hdmi && hdmi->bridge.encoder && hdmi->bridge.encoder->dev)
> + if (hdmi && hdmi->bridge.encoder && hdmi->bridge.encoder->dev) {
> + static enum drm_connector_status status;
> +
> + status = mtk_hdmi_detect(hdmi);
> drm_helper_hpd_irq_event(hdmi->bridge.encoder->dev);
I think you can drop this, as drm_bridge_connector_hpd_cb() calls
drm_kms_helper_hotplug_event().
> + drm_bridge_hpd_notify(&hdmi->bridge, status);
> + }
> }
>
> /*
> * Bridge callbacks
> */
>
> +static enum drm_connector_status mtk_hdmi_bridge_detect(struct drm_bridge *bridge)
> +{
> + struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
> +
> + return mtk_hdmi_detect(hdmi);
> +}
> +
> +static struct edid *mtk_hdmi_bridge_get_edid(struct drm_bridge *bridge,
> + struct drm_connector *connector)
> +{
> + struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
> +
> + return mtk_hdmi_get_edid(hdmi, connector);
As mtk_hdmi_get_edid() is only called here, you could inline it in this
function. Up to you.
> +}
> +
> static int mtk_hdmi_bridge_attach(struct drm_bridge *bridge,
> enum drm_bridge_attach_flags flags)
> {
> struct mtk_hdmi *hdmi = hdmi_ctx_from_bridge(bridge);
> int ret;
>
> - if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
> - DRM_ERROR("Fix bridge driver to make connector optional!");
> + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
> + DRM_ERROR("%s: The flag DRM_BRIDGE_ATTACH_NO_CONNECTOR must be supplied\n",
> + __func__);
> return -EINVAL;
> }
>
> - ret = drm_connector_init_with_ddc(bridge->encoder->dev, &hdmi->conn,
> - &mtk_hdmi_connector_funcs,
> - DRM_MODE_CONNECTOR_HDMIA,
> - hdmi->ddc_adpt);
> - if (ret) {
> - dev_err(hdmi->dev, "Failed to initialize connector: %d\n", ret);
> - return ret;
> - }
> - drm_connector_helper_add(&hdmi->conn, &mtk_hdmi_connector_helper_funcs);
> -
> - hdmi->conn.polled = DRM_CONNECTOR_POLL_HPD;
> - hdmi->conn.interlace_allowed = true;
> - hdmi->conn.doublescan_allowed = false;
> -
> - ret = drm_connector_attach_encoder(&hdmi->conn,
> - bridge->encoder);
> - if (ret) {
> - dev_err(hdmi->dev,
> - "Failed to attach connector to encoder: %d\n", ret);
> - return ret;
> - }
> -
> if (hdmi->next_bridge) {
> ret = drm_bridge_attach(bridge->encoder, hdmi->next_bridge,
> bridge, flags);
> @@ -1444,6 +1397,7 @@ static void mtk_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
> }
>
> static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
> + .mode_valid = mtk_hdmi_bridge_mode_valid,
> .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,
> @@ -1454,6 +1408,8 @@ static const struct drm_bridge_funcs mtk_hdmi_bridge_funcs = {
> .mode_set = mtk_hdmi_bridge_mode_set,
> .atomic_pre_enable = mtk_hdmi_bridge_atomic_pre_enable,
> .atomic_enable = mtk_hdmi_bridge_atomic_enable,
> + .detect = mtk_hdmi_bridge_detect,
> + .get_edid = mtk_hdmi_bridge_get_edid,
> };
>
> static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi,
> @@ -1762,6 +1718,9 @@ static int mtk_drm_hdmi_probe(struct platform_device *pdev)
>
> hdmi->bridge.funcs = &mtk_hdmi_bridge_funcs;
> hdmi->bridge.of_node = pdev->dev.of_node;
> + hdmi->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID
> + | DRM_BRIDGE_OP_HPD;
Nitpicking, I'd align the | to the =.
Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> + hdmi->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
> drm_bridge_add(&hdmi->bridge);
>
> ret = mtk_hdmi_clk_enable_audio(hdmi);
--
Regards,
Laurent Pinchart
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