Re: [PATCH 10/18] drm/vc4: hdmi: Convert to bridge

[Thomas Zimmermann <tzimmermann@xxxxxxx>]

Am 17.03.21 um 16:43 schrieb Maxime Ripard:
> Converting the HDMI controller to a bridge seems like the preferred way
> to support an YUV output, so let's do this.
>
> Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx>

Acked-by: Thomas Zimmermann <tzimmermann@xxxxxxx>

> ---
>   drivers/gpu/drm/vc4/vc4_crtc.c |  37 ++++++-----
>   drivers/gpu/drm/vc4/vc4_drv.c  |  15 +++--
>   drivers/gpu/drm/vc4/vc4_drv.h  |  27 +++++---
>   drivers/gpu/drm/vc4/vc4_hdmi.c | 111 +++++++++++++++++++++------------
>   drivers/gpu/drm/vc4/vc4_hdmi.h |   8 +++
>   5 files changed, 131 insertions(+), 67 deletions(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
> index e2607e1f2520..8c13d31827bc 100644
> --- a/drivers/gpu/drm/vc4/vc4_crtc.c
> +++ b/drivers/gpu/drm/vc4/vc4_crtc.c
> @@ -283,14 +283,19 @@ static struct drm_encoder *vc4_get_crtc_encoder(struct drm_crtc *crtc)
>   	drm_connector_list_iter_begin(crtc->dev, &conn_iter);
>   	drm_for_each_connector_iter(connector, &conn_iter) {
>   		struct drm_encoder *encoder;
> -		struct vc4_encoder *vc4_encoder;
> +		struct drm_bridge *bridge;
> +		struct vc4_bridge *vc4_bridge;
>   
>   		encoder = vc4_get_connector_encoder(connector);
>   		if (!encoder)
>   			continue;
>   
> -		vc4_encoder = to_vc4_encoder(encoder);
> -		if (vc4_encoder->crtc == crtc) {
> +		bridge = drm_bridge_chain_get_first_bridge(encoder);
> +		if (!bridge)
> +			continue;
> +
> +		vc4_bridge = to_vc4_bridge(bridge);
> +		if (vc4_bridge->crtc == crtc) {
>   			drm_connector_list_iter_end(&conn_iter);
>   			return encoder;
>   		}
> @@ -429,7 +434,8 @@ static int vc4_crtc_disable(struct drm_crtc *crtc,
>   			    unsigned int channel)
>   {
>   	struct drm_encoder *encoder = vc4_get_crtc_encoder(crtc);
> -	struct vc4_encoder *vc4_encoder = to_vc4_encoder(encoder);
> +	struct drm_bridge *bridge = drm_bridge_chain_get_first_bridge(encoder);
> +	struct vc4_bridge *vc4_bridge = to_vc4_bridge(bridge);
>   	struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
>   	struct drm_device *dev = crtc->dev;
>   	int ret;
> @@ -457,14 +463,14 @@ static int vc4_crtc_disable(struct drm_crtc *crtc,
>   	 */
>   	mdelay(20);
>   
> -	if (vc4_encoder && vc4_encoder->post_crtc_disable)
> -		vc4_encoder->post_crtc_disable(encoder, state);
> +	if (vc4_bridge && vc4_bridge->post_crtc_disable)
> +		vc4_bridge->post_crtc_disable(bridge, state);
>   
>   	vc4_crtc_pixelvalve_reset(crtc);
>   	vc4_hvs_stop_channel(dev, channel);
>   
> -	if (vc4_encoder && vc4_encoder->post_crtc_powerdown)
> -		vc4_encoder->post_crtc_powerdown(encoder, state);
> +	if (vc4_bridge && vc4_bridge->post_crtc_powerdown)
> +		vc4_bridge->post_crtc_powerdown(bridge, state);
>   
>   	return 0;
>   }
> @@ -529,7 +535,8 @@ static void vc4_crtc_atomic_enable(struct drm_crtc *crtc,
>   	struct drm_device *dev = crtc->dev;
>   	struct vc4_crtc *vc4_crtc = to_vc4_crtc(crtc);
>   	struct drm_encoder *encoder = vc4_get_crtc_encoder(crtc);
> -	struct vc4_encoder *vc4_encoder = to_vc4_encoder(encoder);
> +	struct drm_bridge *bridge = drm_bridge_chain_get_first_bridge(encoder);
> +	struct vc4_bridge *vc4_bridge = to_vc4_bridge(bridge);
>   
>   	require_hvs_enabled(dev);
>   
> @@ -540,15 +547,15 @@ static void vc4_crtc_atomic_enable(struct drm_crtc *crtc,
>   
>   	vc4_hvs_atomic_enable(crtc, state);
>   
> -	if (vc4_encoder->pre_crtc_configure)
> -		vc4_encoder->pre_crtc_configure(encoder, state);
> +	if (vc4_bridge->pre_crtc_configure)
> +		vc4_bridge->pre_crtc_configure(bridge, state);
>   
>   	vc4_crtc_config_pv(crtc);
>   
>   	CRTC_WRITE(PV_CONTROL, CRTC_READ(PV_CONTROL) | PV_CONTROL_EN);
>   
> -	if (vc4_encoder->pre_crtc_enable)
> -		vc4_encoder->pre_crtc_enable(encoder, state);
> +	if (vc4_bridge->pre_crtc_enable)
> +		vc4_bridge->pre_crtc_enable(bridge, state);
>   
>   	/* When feeding the transposer block the pixelvalve is unneeded and
>   	 * should not be enabled.
> @@ -556,8 +563,8 @@ static void vc4_crtc_atomic_enable(struct drm_crtc *crtc,
>   	CRTC_WRITE(PV_V_CONTROL,
>   		   CRTC_READ(PV_V_CONTROL) | PV_VCONTROL_VIDEN);
>   
> -	if (vc4_encoder->post_crtc_enable)
> -		vc4_encoder->post_crtc_enable(encoder, state);
> +	if (vc4_bridge->post_crtc_enable)
> +		vc4_bridge->post_crtc_enable(bridge, state);
>   }
>   
>   static enum drm_mode_status vc4_crtc_mode_valid(struct drm_crtc *crtc,
> diff --git a/drivers/gpu/drm/vc4/vc4_drv.c b/drivers/gpu/drm/vc4/vc4_drv.c
> index cd1fb75c66a7..cee54f3b64e9 100644
> --- a/drivers/gpu/drm/vc4/vc4_drv.c
> +++ b/drivers/gpu/drm/vc4/vc4_drv.c
> @@ -217,20 +217,25 @@ static struct drm_crtc *vc4_drv_find_crtc(struct drm_device *drm,
>   	return NULL;
>   }
>   
> -static void vc4_drv_set_encoder_data(struct drm_device *drm)
> +static void vc4_drv_set_bridge_data(struct drm_device *drm)
>   {
>   	struct drm_encoder *encoder;
>   
>   	drm_for_each_encoder(encoder, drm) {
> -		struct vc4_encoder *vc4_encoder;
> +		struct vc4_bridge *vc4_bridge;
> +		struct drm_bridge *bridge;
>   		struct drm_crtc *crtc;
>   
>   		crtc = vc4_drv_find_crtc(drm, encoder);
>   		if (WARN_ON(!crtc))
>   			return;
>   
> -		vc4_encoder = to_vc4_encoder(encoder);
> -		vc4_encoder->crtc = crtc;
> +		bridge = drm_bridge_chain_get_first_bridge(encoder);
> +		if (!bridge)
> +			continue;
> +
> +		vc4_bridge = to_vc4_bridge(bridge);
> +		vc4_bridge->crtc = crtc;
>   	}
>   }
>   
> @@ -296,7 +301,7 @@ static int vc4_drm_bind(struct device *dev)
>   	ret = component_bind_all(dev, drm);
>   	if (ret)
>   		return ret;
> -	vc4_drv_set_encoder_data(drm);
> +	vc4_drv_set_bridge_data(drm);
>   
>   	ret = vc4_plane_create_additional_planes(drm);
>   	if (ret)
> diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
> index 1b569dcc2154..a5721ffc6529 100644
> --- a/drivers/gpu/drm/vc4/vc4_drv.h
> +++ b/drivers/gpu/drm/vc4/vc4_drv.h
> @@ -10,6 +10,7 @@
>   #include <linux/uaccess.h>
>   
>   #include <drm/drm_atomic.h>
> +#include <drm/drm_bridge.h>
>   #include <drm/drm_debugfs.h>
>   #include <drm/drm_device.h>
>   #include <drm/drm_encoder.h>
> @@ -438,16 +439,8 @@ enum vc4_encoder_type {
>   
>   struct vc4_encoder {
>   	struct drm_encoder base;
> -	struct drm_crtc *crtc;
>   	enum vc4_encoder_type type;
>   	u32 clock_select;
> -
> -	void (*pre_crtc_configure)(struct drm_encoder *encoder, struct drm_atomic_state *state);
> -	void (*pre_crtc_enable)(struct drm_encoder *encoder, struct drm_atomic_state *state);
> -	void (*post_crtc_enable)(struct drm_encoder *encoder, struct drm_atomic_state *state);
> -
> -	void (*post_crtc_disable)(struct drm_encoder *encoder, struct drm_atomic_state *state);
> -	void (*post_crtc_powerdown)(struct drm_encoder *encoder, struct drm_atomic_state *state);
>   };
>   
>   static inline struct vc4_encoder *
> @@ -456,6 +449,24 @@ to_vc4_encoder(struct drm_encoder *encoder)
>   	return container_of(encoder, struct vc4_encoder, base);
>   }
>   
> +struct vc4_bridge {
> +	struct drm_bridge base;
> +	struct drm_crtc *crtc;
> +
> +	void (*pre_crtc_configure)(struct drm_bridge *bridge, struct drm_atomic_state *state);
> +	void (*pre_crtc_enable)(struct drm_bridge *bridge, struct drm_atomic_state *state);
> +	void (*post_crtc_enable)(struct drm_bridge *bridge, struct drm_atomic_state *state);
> +
> +	void (*post_crtc_disable)(struct drm_bridge *bridge, struct drm_atomic_state *state);
> +	void (*post_crtc_powerdown)(struct drm_bridge *bridge, struct drm_atomic_state *state);
> +};
> +
> +static inline struct vc4_bridge *
> +to_vc4_bridge(struct drm_bridge *bridge)
> +{
> +	return container_of(bridge, struct vc4_bridge, base);
> +}
> +
>   struct vc4_crtc_data {
>   	/* Bitmask of channels (FIFOs) of the HVS that the output can source 
from */
>   	unsigned int hvs_available_channels;
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> index 8f0af246f18f..4ce0aea6ba17 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> @@ -454,10 +454,10 @@ static void vc4_hdmi_set_infoframes(struct drm_encoder *encoder)
>   		vc4_hdmi_set_audio_infoframe(encoder);
>   }
>   
> -static void vc4_hdmi_encoder_post_crtc_disable(struct drm_encoder *encoder,
> -					       struct drm_atomic_state *state)
> +static void vc4_hdmi_bridge_post_crtc_disable(struct drm_bridge *bridge,
> +					      struct drm_atomic_state *state)
>   {
> -	struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
> +	struct vc4_hdmi *vc4_hdmi = bridge_to_vc4_hdmi(bridge);
>   
>   	HDMI_WRITE(HDMI_RAM_PACKET_CONFIG, 0);
>   
> @@ -468,10 +468,10 @@ static void vc4_hdmi_encoder_post_crtc_disable(struct drm_encoder *encoder,
>   		   HDMI_READ(HDMI_VID_CTL) | VC4_HD_VID_CTL_BLANKPIX);
>   }
>   
> -static void vc4_hdmi_encoder_post_crtc_powerdown(struct drm_encoder *encoder,
> -						 struct drm_atomic_state *state)
> +static void vc4_hdmi_bridge_post_crtc_powerdown(struct drm_bridge *bridge,
> +						struct drm_atomic_state *state)
>   {
> -	struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
> +	struct vc4_hdmi *vc4_hdmi = bridge_to_vc4_hdmi(bridge);
>   	int ret;
>   
>   	if (vc4_hdmi->variant->phy_disable)
> @@ -489,10 +489,6 @@ static void vc4_hdmi_encoder_post_crtc_powerdown(struct drm_encoder *encoder,
>   		DRM_ERROR("Failed to release power domain: %d\n", ret);
>   }
>   
> -static void vc4_hdmi_encoder_disable(struct drm_encoder *encoder)
> -{
> -}
> -
>   static void vc4_hdmi_csc_setup(struct vc4_hdmi *vc4_hdmi,
>   			       const struct drm_display_mode *mode)
>   {
> @@ -740,9 +736,10 @@ vc4_hdmi_encoder_get_connector_state(struct drm_encoder *encoder,
>   	return NULL;
>   }
>   
> -static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder,
> -						struct drm_atomic_state *state)
> +static void vc4_hdmi_bridge_pre_crtc_configure(struct drm_bridge *bridge,
> +					       struct drm_atomic_state *state)
>   {
> +	struct drm_encoder *encoder = bridge->encoder;
>   	struct drm_connector_state *conn_state =
>   		vc4_hdmi_encoder_get_connector_state(encoder, state);
>   	struct vc4_hdmi_connector_state *vc4_conn_state =
> @@ -836,9 +833,10 @@ static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder,
>   		vc4_hdmi->variant->set_timings(vc4_hdmi, conn_state, mode);
>   }
>   
> -static void vc4_hdmi_encoder_pre_crtc_enable(struct drm_encoder *encoder,
> -					     struct drm_atomic_state *state)
> +static void vc4_hdmi_bridge_pre_crtc_enable(struct drm_bridge *bridge,
> +					    struct drm_atomic_state *state)
>   {
> +	struct drm_encoder *encoder = bridge->encoder;
>   	struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
>   	struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
>   
> @@ -848,9 +846,10 @@ static void vc4_hdmi_encoder_pre_crtc_enable(struct drm_encoder *encoder,
>   	HDMI_WRITE(HDMI_FIFO_CTL, VC4_HDMI_FIFO_CTL_MASTER_SLAVE_N);
>   }
>   
> -static void vc4_hdmi_encoder_post_crtc_enable(struct drm_encoder *encoder,
> -					      struct drm_atomic_state *state)
> +static void vc4_hdmi_bridge_post_crtc_enable(struct drm_bridge *bridge,
> +					     struct drm_atomic_state *state)
>   {
> +	struct drm_encoder *encoder = bridge->encoder;
>   	struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
>   	struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
>   	struct vc4_hdmi_encoder *vc4_encoder = to_vc4_hdmi_encoder(encoder);
> @@ -907,20 +906,17 @@ static void vc4_hdmi_encoder_post_crtc_enable(struct drm_encoder *encoder,
>   	vc4_hdmi_recenter_fifo(vc4_hdmi);
>   }
>   
> -static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder)
> -{
> -}
> -
>   #define WIFI_2_4GHz_CH1_MIN_FREQ	2400000000ULL
>   #define WIFI_2_4GHz_CH1_MAX_FREQ	2422000000ULL
>   
> -static int vc4_hdmi_encoder_atomic_check(struct drm_encoder *encoder,
> -					 struct drm_crtc_state *crtc_state,
> -					 struct drm_connector_state *conn_state)
> +static int vc4_hdmi_bridge_atomic_check(struct drm_bridge *bridge,
> +					struct drm_bridge_state *bridge_state,
> +					struct drm_crtc_state *crtc_state,
> +					struct drm_connector_state *conn_state)
>   {
>   	struct vc4_hdmi_connector_state *vc4_state = conn_state_to_vc4_hdmi_conn_state(conn_state);
>   	struct drm_display_mode *mode = &crtc_state->adjusted_mode;
> -	struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
> +	struct vc4_hdmi *vc4_hdmi = bridge_to_vc4_hdmi(bridge);
>   	unsigned long long pixel_rate = mode->clock * 1000;
>   	unsigned long long tmds_rate;
>   
> @@ -963,10 +959,11 @@ static int vc4_hdmi_encoder_atomic_check(struct drm_encoder *encoder,
>   }
>   
>   static enum drm_mode_status
> -vc4_hdmi_encoder_mode_valid(struct drm_encoder *encoder,
> -			    const struct drm_display_mode *mode)
> +vc4_hdmi_bridge_mode_valid(struct drm_bridge *bridge,
> +			   const struct drm_display_info *info,
> +			   const struct drm_display_mode *mode)
>   {
> -	struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
> +	struct vc4_hdmi *vc4_hdmi = bridge_to_vc4_hdmi(bridge);
>   
>   	if (vc4_hdmi->variant->unsupported_odd_h_timings &&
>   	    ((mode->hdisplay % 2) || (mode->hsync_start % 2) ||
> @@ -979,13 +976,49 @@ vc4_hdmi_encoder_mode_valid(struct drm_encoder *encoder,
>   	return MODE_OK;
>   }
>   
> -static const struct drm_encoder_helper_funcs vc4_hdmi_encoder_helper_funcs = {
> -	.atomic_check = vc4_hdmi_encoder_atomic_check,
> -	.mode_valid = vc4_hdmi_encoder_mode_valid,
> -	.disable = vc4_hdmi_encoder_disable,
> -	.enable = vc4_hdmi_encoder_enable,
> +static int vc4_hdmi_bridge_attach(struct drm_bridge *bridge,
> +				  enum drm_bridge_attach_flags flags)
> +{
> +	struct vc4_hdmi *vc4_hdmi = bridge_to_vc4_hdmi(bridge);
> +
> +	if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
> +		return 0;
> +
> +	return vc4_hdmi_connector_init(bridge->dev, vc4_hdmi);
> +}
> +
> +static const struct drm_bridge_funcs vc4_hdmi_bridge_funcs = {
> +	.attach =	vc4_hdmi_bridge_attach,
> +	.atomic_check =	vc4_hdmi_bridge_atomic_check,
> +	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
> +	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
> +	.atomic_reset = drm_atomic_helper_bridge_reset,
> +	.mode_valid =	vc4_hdmi_bridge_mode_valid,
>   };
>   
> +static int vc4_hdmi_bridge_init(struct drm_device *drm,
> +				struct vc4_hdmi *vc4_hdmi)
> +{
> +	struct drm_encoder *encoder = &vc4_hdmi->encoder.base.base;
> +	struct drm_bridge *bridge = &vc4_hdmi->bridge.base;
> +	struct device *dev = &vc4_hdmi->pdev->dev;
> +	int ret;
> +
> +	bridge->funcs = &vc4_hdmi_bridge_funcs;
> +	bridge->of_node = dev->of_node;
> +	bridge->type = DRM_MODE_CONNECTOR_HDMIA;
> +
> +	drm_bridge_add(bridge);
> +
> +	ret = drm_bridge_attach(encoder, bridge, NULL, 0);
> +	if (ret) {
> +		drm_bridge_remove(bridge);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
>   static u32 vc4_hdmi_channel_map(struct vc4_hdmi *vc4_hdmi, u32 channel_mask)
>   {
>   	int i;
> @@ -1945,14 +1978,15 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
>   	dev_set_drvdata(dev, vc4_hdmi);
>   	encoder = &vc4_hdmi->encoder.base.base;
>   	vc4_hdmi->encoder.base.type = variant->encoder_type;
> -	vc4_hdmi->encoder.base.pre_crtc_configure = vc4_hdmi_encoder_pre_crtc_configure;
> -	vc4_hdmi->encoder.base.pre_crtc_enable = vc4_hdmi_encoder_pre_crtc_enable;
> -	vc4_hdmi->encoder.base.post_crtc_enable = vc4_hdmi_encoder_post_crtc_enable;
> -	vc4_hdmi->encoder.base.post_crtc_disable = vc4_hdmi_encoder_post_crtc_disable;
> -	vc4_hdmi->encoder.base.post_crtc_powerdown = vc4_hdmi_encoder_post_crtc_powerdown;
>   	vc4_hdmi->pdev = pdev;
>   	vc4_hdmi->variant = variant;
>   
> +	vc4_hdmi->bridge.pre_crtc_configure = vc4_hdmi_bridge_pre_crtc_configure;
> +	vc4_hdmi->bridge.pre_crtc_enable = vc4_hdmi_bridge_pre_crtc_enable;
> +	vc4_hdmi->bridge.post_crtc_enable = vc4_hdmi_bridge_post_crtc_enable;
> +	vc4_hdmi->bridge.post_crtc_disable = vc4_hdmi_bridge_post_crtc_disable;
> +	vc4_hdmi->bridge.post_crtc_powerdown = vc4_hdmi_bridge_post_crtc_powerdown;
> +
>   	ret = variant->init_resources(vc4_hdmi);
>   	if (ret)
>   		return ret;
> @@ -1996,9 +2030,8 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
>   	pm_runtime_enable(dev);
>   
>   	drm_simple_encoder_init(drm, encoder, DRM_MODE_ENCODER_TMDS);
> -	drm_encoder_helper_add(encoder, &vc4_hdmi_encoder_helper_funcs);
>   
> -	ret = vc4_hdmi_connector_init(drm, vc4_hdmi);
> +	ret = vc4_hdmi_bridge_init(drm, vc4_hdmi);
>   	if (ret)
>   		goto err_destroy_encoder;
>   
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.h b/drivers/gpu/drm/vc4/vc4_hdmi.h
> index 8e42f9e7b3e2..d03c849d6ea0 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.h
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
> @@ -1,6 +1,7 @@
>   #ifndef _VC4_HDMI_H_
>   #define _VC4_HDMI_H_
>   
> +#include <drm/drm_bridge.h>
>   #include <drm/drm_connector.h>
>   #include <media/cec.h>
>   #include <sound/dmaengine_pcm.h>
> @@ -125,6 +126,7 @@ struct vc4_hdmi {
>   
>   	struct vc4_hdmi_encoder encoder;
>   	struct drm_connector connector;
> +	struct vc4_bridge bridge;
>   
>   	struct i2c_adapter *ddc;
>   	void __iomem *hdmicore_regs;
> @@ -171,6 +173,12 @@ struct vc4_hdmi {
>   	struct debugfs_regset32 hd_regset;
>   };
>   
> +static inline struct vc4_hdmi *
> +bridge_to_vc4_hdmi(struct drm_bridge *bridge)
> +{
> +	return container_of(bridge, struct vc4_hdmi, bridge.base);
> +}
> +
>   static inline struct vc4_hdmi *
>   connector_to_vc4_hdmi(struct drm_connector *connector)
>   {

--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer

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