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Date: Fri, 15 Oct 2021 09:56:21 +0200
From: Neil Armstrong <narmstrong@...libre.com>
To: Sam Ravnborg <sam@...nborg.org>
Cc: daniel@...ll.ch, Laurent.pinchart@...asonboard.com,
martin.blumenstingl@...glemail.com,
dri-devel@...ts.freedesktop.org, linux-amlogic@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] drm/meson: encoder_cvbs: switch to bridge with
ATTACH_NO_CONNECTOR
Hi Sam,
On 14/10/2021 20:15, Sam Ravnborg wrote:
> Hi Neil,
>
> with include order fixed and the comment below considered:
> Acked-by: Sam Ravnborg <sam@...nborg.org>
>
> Sam
>
>
> On Thu, Oct 14, 2021 at 05:26:06PM +0200, Neil Armstrong wrote:
>> Drop the local connector and move all callback to bridge funcs in order
>> to leverage the generic CVBS diplay connector.
>>
>> This will also permit adding custom cvbs connectors for ADC based HPD
>> detection on some Amlogic SoC based boards.
>>
>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
>> ---
>> drivers/gpu/drm/meson/meson_encoder_cvbs.c | 178 +++++++++------------
>> 1 file changed, 79 insertions(+), 99 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/meson/meson_encoder_cvbs.c b/drivers/gpu/drm/meson/meson_encoder_cvbs.c
>> index 01024c5f610c..0b974667cf55 100644
>> --- a/drivers/gpu/drm/meson/meson_encoder_cvbs.c
>> +++ b/drivers/gpu/drm/meson/meson_encoder_cvbs.c
>> @@ -13,6 +13,9 @@
>> #include <linux/of_graph.h>
>>
>> #include <drm/drm_atomic_helper.h>
>> +#include <drm/drm_simple_kms_helper.h>
>> +#include <drm/drm_bridge.h>
>> +#include <drm/drm_bridge_connector.h>
>> #include <drm/drm_device.h>
>> #include <drm/drm_edid.h>
>> #include <drm/drm_probe_helper.h>
> alphabetic order.
>
>> @@ -30,14 +33,14 @@
>>
>> struct meson_encoder_cvbs {
>> struct drm_encoder encoder;
>> - struct drm_connector connector;
>> + struct drm_bridge bridge;
>> + struct drm_bridge *next_bridge;
>> + struct drm_connector *connector;
> Maybe drop this - see later.
>
>> struct meson_drm *priv;
>> };
>> -#define encoder_to_meson_encoder_cvbs(x) \
>> - container_of(x, struct meson_encoder_cvbs, encoder)
>>
>> -#define connector_to_meson_encoder_cvbs(x) \
>> - container_of(x, struct meson_encoder_cvbs, connector)
>> +#define bridge_to_meson_encoder_cvbs(x) \
>> + container_of(x, struct meson_encoder_cvbs, bridge)
>>
>> /* Supported Modes */
>>
>> @@ -81,21 +84,18 @@ meson_cvbs_get_mode(const struct drm_display_mode *req_mode)
>> return NULL;
>> }
>>
>> -/* Connector */
>> -
>> -static void meson_cvbs_connector_destroy(struct drm_connector *connector)
>> +static int meson_encoder_cvbs_attach(struct drm_bridge *bridge,
>> + enum drm_bridge_attach_flags flags)
>> {
>> - drm_connector_cleanup(connector);
>> -}
>> + struct meson_encoder_cvbs *meson_encoder_cvbs =
>> + bridge_to_meson_encoder_cvbs(bridge);
>>
>> -static enum drm_connector_status
>> -meson_cvbs_connector_detect(struct drm_connector *connector, bool force)
>> -{
>> - /* FIXME: Add load-detect or jack-detect if possible */
>> - return connector_status_connected;
>> + return drm_bridge_attach(bridge->encoder, meson_encoder_cvbs->next_bridge,
>> + &meson_encoder_cvbs->bridge, flags);
>> }
>>
>> -static int meson_cvbs_connector_get_modes(struct drm_connector *connector)
>> +static int meson_encoder_cvbs_get_modes(struct drm_bridge *bridge,
>> + struct drm_connector *connector)
>> {
>> struct drm_device *dev = connector->dev;
>> struct drm_display_mode *mode;
>> @@ -116,40 +116,18 @@ static int meson_cvbs_connector_get_modes(struct drm_connector *connector)
>> return i;
>> }
>>
>> -static int meson_cvbs_connector_mode_valid(struct drm_connector *connector,
>> - struct drm_display_mode *mode)
>> +static int meson_encoder_cvbs_mode_valid(struct drm_bridge *bridge,
>> + const struct drm_display_info *display_info,
>> + const struct drm_display_mode *mode)
>> {
>> - /* Validate the modes added in get_modes */
>> - return MODE_OK;
>> -}
>> -
>> -static const struct drm_connector_funcs meson_cvbs_connector_funcs = {
>> - .detect = meson_cvbs_connector_detect,
>> - .fill_modes = drm_helper_probe_single_connector_modes,
>> - .destroy = meson_cvbs_connector_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 meson_cvbs_connector_helper_funcs = {
>> - .get_modes = meson_cvbs_connector_get_modes,
>> - .mode_valid = meson_cvbs_connector_mode_valid,
>> -};
>> + if (meson_cvbs_get_mode(mode))
>> + return MODE_OK;
>>
>> -/* Encoder */
>> -
>> -static void meson_encoder_cvbs_encoder_destroy(struct drm_encoder *encoder)
>> -{
>> - drm_encoder_cleanup(encoder);
>> + return MODE_BAD;
>> }
>>
>> -static const struct drm_encoder_funcs meson_encoder_cvbs_encoder_funcs = {
>> - .destroy = meson_encoder_cvbs_encoder_destroy,
>> -};
>> -
>> -static int meson_encoder_cvbs_encoder_atomic_check(struct drm_encoder *encoder,
>> +static int meson_encoder_cvbs_atomic_check(struct drm_bridge *bridge,
>> + struct drm_bridge_state *bridge_state,
>> struct drm_crtc_state *crtc_state,
>> struct drm_connector_state *conn_state)
>> {
>> @@ -159,10 +137,10 @@ static int meson_encoder_cvbs_encoder_atomic_check(struct drm_encoder *encoder,
>> return -EINVAL;
>> }
>>
>> -static void meson_encoder_cvbs_encoder_disable(struct drm_encoder *encoder)
>> +static void meson_encoder_cvbs_disable(struct drm_bridge *bridge)
>> {
>> struct meson_encoder_cvbs *meson_encoder_cvbs =
>> - encoder_to_meson_encoder_cvbs(encoder);
>> + bridge_to_meson_encoder_cvbs(bridge);
>> struct meson_drm *priv = meson_encoder_cvbs->priv;
>>
>> /* Disable CVBS VDAC */
>> @@ -175,10 +153,10 @@ static void meson_encoder_cvbs_encoder_disable(struct drm_encoder *encoder)
>> }
>> }
>>
>> -static void meson_encoder_cvbs_encoder_enable(struct drm_encoder *encoder)
>> +static void meson_encoder_cvbs_enable(struct drm_bridge *bridge)
>> {
>> struct meson_encoder_cvbs *meson_encoder_cvbs =
>> - encoder_to_meson_encoder_cvbs(encoder);
>> + bridge_to_meson_encoder_cvbs(bridge);
>> struct meson_drm *priv = meson_encoder_cvbs->priv;
>>
>> /* VDAC0 source is not from ATV */
>> @@ -198,13 +176,13 @@ static void meson_encoder_cvbs_encoder_enable(struct drm_encoder *encoder)
>> }
>> }
>>
>> -static void meson_encoder_cvbs_encoder_mode_set(struct drm_encoder *encoder,
>> - struct drm_display_mode *mode,
>> - struct drm_display_mode *adjusted_mode)
>> +static void meson_encoder_cvbs_mode_set(struct drm_bridge *bridge,
>> + const struct drm_display_mode *mode,
>> + const struct drm_display_mode *adjusted_mode)
>> {
>> const struct meson_cvbs_mode *meson_mode = meson_cvbs_get_mode(mode);
>> struct meson_encoder_cvbs *meson_encoder_cvbs =
>> - encoder_to_meson_encoder_cvbs(encoder);
>> + bridge_to_meson_encoder_cvbs(bridge);
>> struct meson_drm *priv = meson_encoder_cvbs->priv;
>>
>> if (meson_mode) {
>> @@ -218,76 +196,78 @@ static void meson_encoder_cvbs_encoder_mode_set(struct drm_encoder *encoder,
>> }
>> }
>>
>> -static const struct drm_encoder_helper_funcs
>> - meson_encoder_cvbs_encoder_helper_funcs = {
>> - .atomic_check = meson_encoder_cvbs_encoder_atomic_check,
>> - .disable = meson_encoder_cvbs_encoder_disable,
>> - .enable = meson_encoder_cvbs_encoder_enable,
>> - .mode_set = meson_encoder_cvbs_encoder_mode_set,
>> +static const struct drm_bridge_funcs meson_encoder_cvbs_bridge_funcs = {
>> + .attach = meson_encoder_cvbs_attach,
>> + .enable = meson_encoder_cvbs_enable,
>> + .disable = meson_encoder_cvbs_disable,
>> + .mode_valid = meson_encoder_cvbs_mode_valid,
>> + .mode_set = meson_encoder_cvbs_mode_set,
>> + .get_modes = meson_encoder_cvbs_get_modes,
>> + .atomic_check = meson_encoder_cvbs_atomic_check,
>> };
>>
>> -static bool meson_encoder_cvbs_connector_is_available(struct meson_drm *priv)
>> -{
>> - struct device_node *remote;
>> -
>> - remote = of_graph_get_remote_node(priv->dev->of_node, 0, 0);
>> - if (!remote)
>> - return false;
>> -
>> - of_node_put(remote);
>> - return true;
>> -}
>> -
>> int meson_encoder_cvbs_init(struct meson_drm *priv)
>> {
>> struct drm_device *drm = priv->drm;
>> struct meson_encoder_cvbs *meson_encoder_cvbs;
>> - struct drm_connector *connector;
>> - struct drm_encoder *encoder;
>> + struct device_node *remote;
>> int ret;
>>
>> - if (!meson_encoder_cvbs_connector_is_available(priv)) {
>> + meson_encoder_cvbs = devm_kzalloc(priv->dev, sizeof(*meson_encoder_cvbs), GFP_KERNEL);
>> + if (!meson_encoder_cvbs)
>> + return -ENOMEM;
>> +
>> + /* CVBS Connector Bridge */
>> + remote = of_graph_get_remote_node(priv->dev->of_node, 0, 0);
>> + if (!remote) {
>> dev_info(drm->dev, "CVBS Output connector not available\n");
>> return 0;
>> }
>>
>> - meson_encoder_cvbs = devm_kzalloc(priv->dev, sizeof(*meson_encoder_cvbs),
>> - GFP_KERNEL);
>> - if (!meson_encoder_cvbs)
>> - return -ENOMEM;
>> + meson_encoder_cvbs->next_bridge = of_drm_find_bridge(remote);
>> + if (!meson_encoder_cvbs->next_bridge) {
>> + dev_err(priv->dev, "Failed to find CVBS Connector bridge\n");
>> + return -EPROBE_DEFER;
>> + }
>>
>> - meson_encoder_cvbs->priv = priv;
>> - encoder = &meson_encoder_cvbs->encoder;
>> - connector = &meson_encoder_cvbs->connector;
>> + /* CVBS Encoder Bridge */
>> + meson_encoder_cvbs->bridge.funcs = &meson_encoder_cvbs_bridge_funcs;
>> + meson_encoder_cvbs->bridge.of_node = priv->dev->of_node;
>> + meson_encoder_cvbs->bridge.type = DRM_MODE_CONNECTOR_Composite;
>> + meson_encoder_cvbs->bridge.ops = DRM_BRIDGE_OP_MODES;
>> + meson_encoder_cvbs->bridge.interlace_allowed = true;
>>
>> - /* Connector */
>> + drm_bridge_add(&meson_encoder_cvbs->bridge);
>>
>> - drm_connector_helper_add(connector,
>> - &meson_cvbs_connector_helper_funcs);
>> + meson_encoder_cvbs->priv = priv;
>>
>> - ret = drm_connector_init(drm, connector, &meson_cvbs_connector_funcs,
>> - DRM_MODE_CONNECTOR_Composite);
>> + /* Encoder */
>> + ret = drm_simple_encoder_init(priv->drm, &meson_encoder_cvbs->encoder,
>> + DRM_MODE_ENCODER_TVDAC);
>> if (ret) {
>> - dev_err(priv->dev, "Failed to init CVBS connector\n");
>> + dev_err(priv->dev, "Failed to init CVBS encoder: %d\n", ret);
>> return ret;
>> }
>>
>> - connector->interlace_allowed = 1;
>> + meson_encoder_cvbs->encoder.possible_crtcs = BIT(0);
>>
>> - /* Encoder */
>> -
>> - drm_encoder_helper_add(encoder, &meson_encoder_cvbs_encoder_helper_funcs);
>> -
>> - ret = drm_encoder_init(drm, encoder, &meson_encoder_cvbs_encoder_funcs,
>> - DRM_MODE_ENCODER_TVDAC, "meson_encoder_cvbs");
>> + /* Attach CVBS Encoder Bridge to Encoder */
>> + ret = drm_bridge_attach(&meson_encoder_cvbs->encoder, &meson_encoder_cvbs->bridge, NULL,
>> + DRM_BRIDGE_ATTACH_NO_CONNECTOR);
>> if (ret) {
>> - dev_err(priv->dev, "Failed to init CVBS encoder\n");
>> + dev_err(priv->dev, "Failed to attach bridge: %d\n", ret);
>> return ret;
>> }
>>
>> - encoder->possible_crtcs = BIT(0);
>> -
>> - drm_connector_attach_encoder(connector, encoder);
>> + /* Initialize & attach Bridge Connector */
>> + meson_encoder_cvbs->connector = drm_bridge_connector_init(priv->drm,
>> + &meson_encoder_cvbs->encoder);
> I did not see other uses of meson_encoder_cvbs->connector, so if I am
> right a local variable can be used and the member dropped.
You're right, I'll drop this.
Thanks
Neil
>
>> + if (IS_ERR(meson_encoder_cvbs->connector)) {
>> + dev_err(priv->dev, "Unable to create CVBS bridge connector\n");
>> + return PTR_ERR(meson_encoder_cvbs->connector);
>> + }
>> + drm_connector_attach_encoder(meson_encoder_cvbs->connector,
>> + &meson_encoder_cvbs->encoder);
>>
>> return 0;
>> }
>> --
>> 2.25.1
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