Re: [PATCH v4 10/10] drm/vs: add simple dsi encoder

[Maxime Ripard <mripard@kernel.org>]

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Hi,

On Tue, May 21, 2024 at 06:58:17PM GMT, keith wrote:
> add encoder to match cdns dsi driver
> 
> Signed-off-by: keith <keith.zhao@starfivetech.com>
> ---
>  drivers/gpu/drm/verisilicon/Makefile        |   3 +-
>  drivers/gpu/drm/verisilicon/vs_drv.c        |   1 +
>  drivers/gpu/drm/verisilicon/vs_drv.h        |   1 +
>  drivers/gpu/drm/verisilicon/vs_simple_enc.c | 190 ++++++++++++++++++++
>  drivers/gpu/drm/verisilicon/vs_simple_enc.h |  25 +++
>  5 files changed, 219 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/gpu/drm/verisilicon/vs_simple_enc.c
>  create mode 100644 drivers/gpu/drm/verisilicon/vs_simple_enc.h
> 
> diff --git a/drivers/gpu/drm/verisilicon/Makefile b/drivers/gpu/drm/verisilicon/Makefile
> index 2d02b4a3a567..c35ba9bd6f81 100644
> --- a/drivers/gpu/drm/verisilicon/Makefile
> +++ b/drivers/gpu/drm/verisilicon/Makefile
> @@ -4,7 +4,8 @@ vs_drm-objs := vs_dc_hw.o \
>  		vs_modeset.o \
>  		vs_plane.o \
>  		vs_crtc.o \
> -		vs_drv.o
> +		vs_drv.o \
> +		vs_simple_enc.o
>  
>  vs_drm-$(CONFIG_DRM_INNO_STARFIVE_HDMI) += inno_hdmi-starfive.o
>  obj-$(CONFIG_DRM_VERISILICON_DC8200) += vs_drm.o
> diff --git a/drivers/gpu/drm/verisilicon/vs_drv.c b/drivers/gpu/drm/verisilicon/vs_drv.c
> index 6f04102b05b3..2748d48f2c7e 100644
> --- a/drivers/gpu/drm/verisilicon/vs_drv.c
> +++ b/drivers/gpu/drm/verisilicon/vs_drv.c
> @@ -612,6 +612,7 @@ static struct platform_driver *drm_sub_drivers[] = {
>  #ifdef CONFIG_DRM_INNO_STARFIVE_HDMI
>  	&starfive_hdmi_driver,
>  #endif
> +	&simple_encoder_driver,
>  };
>  
>  static struct component_match *vs_add_external_components(struct device *dev)
> diff --git a/drivers/gpu/drm/verisilicon/vs_drv.h b/drivers/gpu/drm/verisilicon/vs_drv.h
> index c3c08ed5f8ac..f3f0f170777d 100644
> --- a/drivers/gpu/drm/verisilicon/vs_drv.h
> +++ b/drivers/gpu/drm/verisilicon/vs_drv.h
> @@ -17,6 +17,7 @@
>  #include <drm/drm_managed.h>
>  
>  #include "vs_dc_hw.h"
> +#include "vs_simple_enc.h"
>  
>  /*@pitch_alignment: buffer pitch alignment required by sub-devices.*/
>  struct vs_drm_device {
> diff --git a/drivers/gpu/drm/verisilicon/vs_simple_enc.c b/drivers/gpu/drm/verisilicon/vs_simple_enc.c
> new file mode 100644
> index 000000000000..d0b1755d77d2
> --- /dev/null
> +++ b/drivers/gpu/drm/verisilicon/vs_simple_enc.c
> @@ -0,0 +1,190 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2020 VeriSilicon Holdings Co., Ltd.
> + */
> +#include <linux/component.h>
> +#include <linux/of_device.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +#include <linux/media-bus-format.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/platform_device.h>
> +#include <linux/of.h>
> +
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_bridge.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_of.h>
> +
> +#include "vs_crtc.h"
> +#include "vs_simple_enc.h"
> +
> +static const struct simple_encoder_priv dsi_priv = {
> +	.encoder_type = DRM_MODE_ENCODER_DSI
> +};

A simple encoder is a thing in KMS, and it's not what you are doing /
using. Please use a different name.

> +static inline struct vs_simple_encoder *to_simple_encoder(struct drm_encoder *enc)
> +{
> +	return container_of(enc, struct vs_simple_encoder, encoder);
> +}
> +
> +static int encoder_parse_dt(struct device *dev)
> +{
> +	struct vs_simple_encoder *simple = dev_get_drvdata(dev);
> +	unsigned int args[2];
> +
> +	simple->dss_regmap = syscon_regmap_lookup_by_phandle_args(dev->of_node,
> +								  "starfive,syscon",
> +								  2, args);
> +
> +	if (IS_ERR(simple->dss_regmap)) {
> +		return dev_err_probe(dev, PTR_ERR(simple->dss_regmap),
> +				     "getting the regmap failed\n");
> +	}
> +
> +	simple->offset = args[0];
> +	simple->mask = args[1];
> +
> +	return 0;
> +}
> +
> +static void vs_encoder_atomic_enable(struct drm_encoder *encoder, struct drm_atomic_state *state)
> +{
> +	struct vs_simple_encoder *simple = to_simple_encoder(encoder);
> +
> +	regmap_update_bits(simple->dss_regmap, simple->offset, simple->mask, simple->mask);
> +}

That should be handled through cdns_dsi_platform_ops.enable.

> +static int vs_encoder_atomic_check(struct drm_encoder *encoder,
> +				   struct drm_crtc_state *crtc_state,
> +				   struct drm_connector_state *conn_state)
> +{
> +	struct vs_crtc_state *vs_crtc_state = to_vs_crtc_state(crtc_state);
> +	struct drm_connector *connector = conn_state->connector;
> +	int ret = 0;
> +
> +	vs_crtc_state->encoder_type = encoder->encoder_type;
> +	if (connector->display_info.num_bus_formats)
> +		vs_crtc_state->output_fmt = connector->display_info.bus_formats[0];
> +	else
> +		vs_crtc_state->output_fmt = MEDIA_BUS_FMT_FIXED;
> +
> +	switch (vs_crtc_state->output_fmt) {
> +	case MEDIA_BUS_FMT_FIXED:
> +	case MEDIA_BUS_FMT_RGB565_1X16:
> +	case MEDIA_BUS_FMT_RGB666_1X18:
> +	case MEDIA_BUS_FMT_RGB888_1X24:
> +	case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
> +	case MEDIA_BUS_FMT_RGB101010_1X30:
> +	case MEDIA_BUS_FMT_UYYVYY8_0_5X24:
> +	case MEDIA_BUS_FMT_UYVY8_1X16:
> +	case MEDIA_BUS_FMT_YUV8_1X24:
> +	case MEDIA_BUS_FMT_UYYVYY10_0_5X30:
> +	case MEDIA_BUS_FMT_UYVY10_1X20:
> +	case MEDIA_BUS_FMT_YUV10_1X30:
> +		ret = 0;
> +		break;
> +	default:
> +		ret = -EINVAL;
> +		break;
> +	}
> +
> +	/* If MEDIA_BUS_FMT_FIXED, set it to default value */
> +	if (vs_crtc_state->output_fmt == MEDIA_BUS_FMT_FIXED)
> +		vs_crtc_state->output_fmt = MEDIA_BUS_FMT_RGB888_1X24;
> +
> +	return ret;
> +}

And that should be handled by the core cdns-dsi driver.

Maxime

> +static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
> +	.atomic_check = vs_encoder_atomic_check,
> +	.atomic_enable = vs_encoder_atomic_enable,
> +};
> +
> +static int vs_encoder_bind(struct device *dev, struct device *master, void *data)
> +{
> +	struct drm_device *drm_dev = data;
> +	struct vs_simple_encoder *simple = dev_get_drvdata(dev);
> +	struct drm_encoder *encoder;
> +	struct drm_bridge *bridge;
> +	int ret;
> +
> +	encoder = &simple->encoder;
> +
> +	ret = drmm_encoder_init(drm_dev, encoder, NULL, simple->priv->encoder_type, NULL);
> +	if (ret)
> +		return ret;
> +
> +	drm_encoder_helper_add(encoder, &encoder_helper_funcs);
> +
> +	encoder->possible_crtcs =
> +			drm_of_find_possible_crtcs(drm_dev, dev->of_node);
> +
> +	/* output port is port1*/
> +	bridge = devm_drm_of_get_bridge(dev, dev->of_node, 1, 0);
> +	if (IS_ERR(bridge)) {
> +		if (PTR_ERR(bridge) == -ENODEV) {
> +			bridge = NULL;
> +			return 0;
> +		}
> +
> +		return PTR_ERR(bridge);
> +	}
> +
> +	return drm_bridge_attach(encoder, bridge, NULL, 0);
> +}
> +
> +static const struct component_ops encoder_component_ops = {
> +	.bind = vs_encoder_bind,
> +};
> +
> +static int vs_encoder_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct vs_simple_encoder *simple;
> +	int ret;
> +
> +	simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL);
> +	if (!simple)
> +		return -ENOMEM;
> +
> +	simple->priv = of_device_get_match_data(dev);
> +
> +	simple->dev = dev;
> +
> +	dev_set_drvdata(dev, simple);
> +
> +	ret = encoder_parse_dt(dev);
> +	if (ret)
> +		return ret;
> +
> +	return component_add(dev, &encoder_component_ops);
> +}
> +
> +static int vs_encoder_remove(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +
> +	component_del(dev, &encoder_component_ops);
> +	dev_set_drvdata(dev, NULL);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id simple_encoder_dt_match[] = {
> +	{ .compatible = "starfive,dsi-encoder", .data = &dsi_priv},
> +	{},
> +};

You also don't need a specific compatible here, just reuse cdns,dsi.

Maxime

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