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Date: Wed, 22 May 2024 09:29:43 +0200
From: Maxime Ripard <mripard@...nel.org>
To: keith <keith.zhao@...rfivetech.com>
Cc: andrzej.hajda@...el.com, neil.armstrong@...aro.org, rfoss@...nel.org,
Laurent.pinchart@...asonboard.com, jonas@...boo.se, jernej.skrabec@...il.com,
maarten.lankhorst@...ux.intel.com, tzimmermann@...e.de, airlied@...il.com, daniel@...ll.ch,
robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org, hjc@...k-chips.com,
heiko@...ech.de, andy.yan@...k-chips.com, xingyu.wu@...rfivetech.com,
p.zabel@...gutronix.de, jack.zhu@...rfivetech.com, shengyang.chen@...rfivetech.com,
dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 10/10] drm/vs: add simple dsi encoder
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@...rfivetech.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"
>
> /*@...ch_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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