Hi Fabrizio,
thanks for the patch.
On Mon, Nov 04, 2019 at 04:58:00PM +0000, Fabrizio Castro wrote:
> lvds-encoder.c implementation is also suitable for LVDS decoders,
> not just LVDS encoders.
> Instead of creating a new driver for addressing support for
> transparent LVDS decoders, repurpose lvds-encoder.c for the greater
> good.
>
> Signed-off-by: Fabrizio Castro <fabrizio.castro@xxxxxxxxxxxxxx>
>
> ---
> v1->v2:
> * No change
> ---
> drivers/gpu/drm/bridge/Kconfig | 8 +-
> drivers/gpu/drm/bridge/Makefile | 2 +-
> drivers/gpu/drm/bridge/lvds-codec.c | 169 ++++++++++++++++++++++++++++++++++
> drivers/gpu/drm/bridge/lvds-encoder.c | 155 -------------------------------
> 4 files changed, 174 insertions(+), 160 deletions(-)
> create mode 100644 drivers/gpu/drm/bridge/lvds-codec.c
> delete mode 100644 drivers/gpu/drm/bridge/lvds-encoder.c
>
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index 3436297..9e75ca4e 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -45,14 +45,14 @@ config DRM_DUMB_VGA_DAC
> Support for non-programmable RGB to VGA DAC bridges, such as ADI
> ADV7123, TI THS8134 and THS8135 or passive resistor ladder DACs.
>
> -config DRM_LVDS_ENCODER
> - tristate "Transparent parallel to LVDS encoder support"
> +config DRM_LVDS_CODEC
> + tristate "Transparent LVDS encoders and decoders support"
> depends on OF
> select DRM_KMS_HELPER
> select DRM_PANEL_BRIDGE
> help
> - Support for transparent parallel to LVDS encoders that don't require
> - any configuration.
> + Support for transparent LVDS encoders and LVDS decoders that don't
> + require any configuration.
>
> config DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW
> tristate "MegaChips stdp4028-ge-b850v3-fw and stdp2690-ge-b850v3-fw"
> diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> index 4934fcf..8a9178a 100644
> --- a/drivers/gpu/drm/bridge/Makefile
> +++ b/drivers/gpu/drm/bridge/Makefile
> @@ -2,7 +2,7 @@
> obj-$(CONFIG_DRM_ANALOGIX_ANX78XX) += analogix-anx78xx.o
> obj-$(CONFIG_DRM_CDNS_DSI) += cdns-dsi.o
> obj-$(CONFIG_DRM_DUMB_VGA_DAC) += dumb-vga-dac.o
> -obj-$(CONFIG_DRM_LVDS_ENCODER) += lvds-encoder.o
> +obj-$(CONFIG_DRM_LVDS_CODEC) += lvds-codec.o
> obj-$(CONFIG_DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW) += megachips-stdpxxxx-ge-b850v3-fw.o
> obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
> obj-$(CONFIG_DRM_PARADE_PS8622) += parade-ps8622.o
> diff --git a/drivers/gpu/drm/bridge/lvds-codec.c b/drivers/gpu/drm/bridge/lvds-codec.c
> new file mode 100644
> index 0000000..8a1979c
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/lvds-codec.c
> @@ -0,0 +1,169 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (C) 2016 Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> + */
> +
> +#include <linux/gpio/consumer.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/of_graph.h>
> +#include <linux/platform_device.h>
> +
> +#include <drm/drm_bridge.h>
> +#include <drm/drm_panel.h>
> +
> +struct lvds_codec {
> + struct drm_bridge bridge;
> + struct drm_bridge *panel_bridge;
> + struct gpio_desc *powerdown_gpio;
> + u32 connector_type;
> +};
> +
> +static int lvds_codec_attach(struct drm_bridge *bridge)
> +{
> + struct lvds_codec *lvds_codec = container_of(bridge,
> + struct lvds_codec,
> + bridge);
> +
Weird indentation. Align to open ( to match the rest of the driver's
style.
> + return drm_bridge_attach(bridge->encoder, lvds_codec->panel_bridge,
> + bridge);
> +}
> +
> +static void lvds_codec_enable(struct drm_bridge *bridge)
> +{
> + struct lvds_codec *lvds_codec = container_of(bridge,
> + struct lvds_codec,
> + bridge);
> +
Here too
> + if (lvds_codec->powerdown_gpio)
> + gpiod_set_value_cansleep(lvds_codec->powerdown_gpio, 0);
> +}
> +
> +static void lvds_codec_disable(struct drm_bridge *bridge)
> +{
> + struct lvds_codec *lvds_codec = container_of(bridge,
> + struct lvds_codec,
> + bridge);
> +
> + if (lvds_codec->powerdown_gpio)
> + gpiod_set_value_cansleep(lvds_codec->powerdown_gpio, 1);
> +}
> +
> +static struct drm_bridge_funcs funcs = {
> + .attach = lvds_codec_attach,
> + .enable = lvds_codec_enable,
> + .disable = lvds_codec_disable,
> +};
> +
> +static int lvds_codec_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct device_node *port;
> + struct device_node *endpoint;
> + struct device_node *panel_node;
> + struct drm_panel *panel;
> + struct lvds_codec *lvds_codec;
> +
> + lvds_codec = devm_kzalloc(dev, sizeof(*lvds_codec), GFP_KERNEL);
> + if (!lvds_codec)
> + return -ENOMEM;
> +
> + lvds_codec->connector_type = (u32)
> + of_device_get_match_data(&pdev->dev);
Fits in 1 line
> + lvds_codec->powerdown_gpio = devm_gpiod_get_optional(dev, "powerdown",
> + GPIOD_OUT_HIGH);
> + if (IS_ERR(lvds_codec->powerdown_gpio)) {
> + int err = PTR_ERR(lvds_codec->powerdown_gpio);
> +
> + if (err != -EPROBE_DEFER)
> + dev_err(dev, "powerdown GPIO failure: %d\n", err);
> + return err;
I know it was there already, but this seems a bit unusual for the
minimal gain of having a printout in the very unlikely case the
gpiod_get() operations fails. I would just return PTR_ERR().
> + }
> +
> + /* Locate the panel DT node. */
> + port = of_graph_get_port_by_id(dev->of_node, 1);
> + if (!port) {
> + dev_dbg(dev, "port 1 not found\n");
> + return -ENXIO;
> + }
> +
> + endpoint = of_get_child_by_name(port, "endpoint");
> + of_node_put(port);
> + if (!endpoint) {
> + dev_dbg(dev, "no endpoint for port 1\n");
> + return -ENXIO;
> + }
I know it was there already, but this could be simplified with
of_graph_get_endpoint_by_regs()
> +
> + panel_node = of_graph_get_remote_port_parent(endpoint);
> + of_node_put(endpoint);
> + if (!panel_node) {
> + dev_dbg(dev, "no remote endpoint for port 1\n");
> + return -ENXIO;
> + }
Or even better, simplify these three with of_graph_get_remote_node()
> +
> + panel = of_drm_find_panel(panel_node);
> + of_node_put(panel_node);
> + if (IS_ERR(panel)) {
> + dev_dbg(dev, "panel not found, deferring probe\n");
> + return PTR_ERR(panel);
> + }
> +
> + lvds_codec->panel_bridge =
> + devm_drm_panel_bridge_add_typed(dev, panel,
> + lvds_codec->connector_type);
The function documentation reports this as deprecated and suggested to
use the non-typed version. Do you think it could work for this new
codec driver ?
> + if (IS_ERR(lvds_codec->panel_bridge))
> + return PTR_ERR(lvds_codec->panel_bridge);
> +
> + /* The panel_bridge bridge is attached to the panel's of_node,
> + * but we need a bridge attached to our of_node for our user
> + * to look up.
> + */
> + lvds_codec->bridge.of_node = dev->of_node;
> + lvds_codec->bridge.funcs = &funcs;
> + drm_bridge_add(&lvds_codec->bridge);
> +
> + platform_set_drvdata(pdev, lvds_codec);
> +
> + return 0;
> +}
> +
> +static int lvds_codec_remove(struct platform_device *pdev)
> +{
> + struct lvds_codec *lvds_codec = platform_get_drvdata(pdev);
> +
> + drm_bridge_remove(&lvds_codec->bridge);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id lvds_codec_match[] = {
> + {
> + .compatible = "lvds-encoder",
> + .data = (void *)DRM_MODE_CONNECTOR_LVDS
In case you for for drm_panel_bridge_add() you could drop the type
> + },
> + {
> + .compatible = "thine,thc63lvdm83d",
> + .data = (void *)DRM_MODE_CONNECTOR_LVDS,
> + },
> + {
> + .compatible = "lvds-decoder",
> + .data = (void *)DRM_MODE_CONNECTOR_Unknown,
> + },
Which decoder are you using? This is a generic fallback, but I would
expect compatible for a real device to appear in DTS.
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, lvds_codec_match);
> +
> +static struct platform_driver lvds_codec_driver = {
> + .probe = lvds_codec_probe,
> + .remove = lvds_codec_remove,
> + .driver = {
> + .name = "lvds-codec",
> + .of_match_table = lvds_codec_match,
> + },
> +};
> +module_platform_driver(lvds_codec_driver);
> +
> +MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("Driver for transparent LVDS encoders and LVDS decoders");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/gpu/drm/bridge/lvds-encoder.c b/drivers/gpu/drm/bridge/lvds-encoder.c
> deleted file mode 100644
> index e2132a8..0000000
> --- a/drivers/gpu/drm/bridge/lvds-encoder.c
> +++ /dev/null
> @@ -1,155 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0-or-later
> -/*
> - * Copyright (C) 2016 Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> - */
> -
> -#include <linux/gpio/consumer.h>
> -#include <linux/module.h>
> -#include <linux/of.h>
> -#include <linux/of_graph.h>
> -#include <linux/platform_device.h>
> -
> -#include <drm/drm_bridge.h>
> -#include <drm/drm_panel.h>
> -
> -struct lvds_encoder {
> - struct drm_bridge bridge;
> - struct drm_bridge *panel_bridge;
> - struct gpio_desc *powerdown_gpio;
> -};
> -
> -static int lvds_encoder_attach(struct drm_bridge *bridge)
> -{
> - struct lvds_encoder *lvds_encoder = container_of(bridge,
> - struct lvds_encoder,
> - bridge);
> -
> - return drm_bridge_attach(bridge->encoder, lvds_encoder->panel_bridge,
> - bridge);
> -}
> -
> -static void lvds_encoder_enable(struct drm_bridge *bridge)
> -{
> - struct lvds_encoder *lvds_encoder = container_of(bridge,
> - struct lvds_encoder,
> - bridge);
> -
> - if (lvds_encoder->powerdown_gpio)
> - gpiod_set_value_cansleep(lvds_encoder->powerdown_gpio, 0);
> -}
> -
> -static void lvds_encoder_disable(struct drm_bridge *bridge)
> -{
> - struct lvds_encoder *lvds_encoder = container_of(bridge,
> - struct lvds_encoder,
> - bridge);
> -
> - if (lvds_encoder->powerdown_gpio)
> - gpiod_set_value_cansleep(lvds_encoder->powerdown_gpio, 1);
> -}
> -
> -static struct drm_bridge_funcs funcs = {
> - .attach = lvds_encoder_attach,
> - .enable = lvds_encoder_enable,
> - .disable = lvds_encoder_disable,
> -};
> -
> -static int lvds_encoder_probe(struct platform_device *pdev)
> -{
> - struct device *dev = &pdev->dev;
> - struct device_node *port;
> - struct device_node *endpoint;
> - struct device_node *panel_node;
> - struct drm_panel *panel;
> - struct lvds_encoder *lvds_encoder;
> -
> - lvds_encoder = devm_kzalloc(dev, sizeof(*lvds_encoder), GFP_KERNEL);
> - if (!lvds_encoder)
> - return -ENOMEM;
> -
> - lvds_encoder->powerdown_gpio = devm_gpiod_get_optional(dev, "powerdown",
> - GPIOD_OUT_HIGH);
> - if (IS_ERR(lvds_encoder->powerdown_gpio)) {
> - int err = PTR_ERR(lvds_encoder->powerdown_gpio);
> -
> - if (err != -EPROBE_DEFER)
> - dev_err(dev, "powerdown GPIO failure: %d\n", err);
> - return err;
> - }
> -
> - /* Locate the panel DT node. */
> - port = of_graph_get_port_by_id(dev->of_node, 1);
> - if (!port) {
> - dev_dbg(dev, "port 1 not found\n");
> - return -ENXIO;
> - }
> -
> - endpoint = of_get_child_by_name(port, "endpoint");
> - of_node_put(port);
> - if (!endpoint) {
> - dev_dbg(dev, "no endpoint for port 1\n");
> - return -ENXIO;
> - }
> -
> - panel_node = of_graph_get_remote_port_parent(endpoint);
> - of_node_put(endpoint);
> - if (!panel_node) {
> - dev_dbg(dev, "no remote endpoint for port 1\n");
> - return -ENXIO;
> - }
> -
> - panel = of_drm_find_panel(panel_node);
> - of_node_put(panel_node);
> - if (IS_ERR(panel)) {
> - dev_dbg(dev, "panel not found, deferring probe\n");
> - return PTR_ERR(panel);
> - }
> -
> - lvds_encoder->panel_bridge =
> - devm_drm_panel_bridge_add_typed(dev, panel,
> - DRM_MODE_CONNECTOR_LVDS);
> - if (IS_ERR(lvds_encoder->panel_bridge))
> - return PTR_ERR(lvds_encoder->panel_bridge);
> -
> - /* The panel_bridge bridge is attached to the panel's of_node,
> - * but we need a bridge attached to our of_node for our user
> - * to look up.
> - */
> - lvds_encoder->bridge.of_node = dev->of_node;
> - lvds_encoder->bridge.funcs = &funcs;
> - drm_bridge_add(&lvds_encoder->bridge);
> -
> - platform_set_drvdata(pdev, lvds_encoder);
> -
> - return 0;
> -}
> -
> -static int lvds_encoder_remove(struct platform_device *pdev)
> -{
> - struct lvds_encoder *lvds_encoder = platform_get_drvdata(pdev);
> -
> - drm_bridge_remove(&lvds_encoder->bridge);
> -
> - return 0;
> -}
> -
> -static const struct of_device_id lvds_encoder_match[] = {
> - { .compatible = "lvds-encoder" },
> - { .compatible = "thine,thc63lvdm83d" },
> - {},
> -};
> -MODULE_DEVICE_TABLE(of, lvds_encoder_match);
> -
> -static struct platform_driver lvds_encoder_driver = {
> - .probe = lvds_encoder_probe,
> - .remove = lvds_encoder_remove,
> - .driver = {
> - .name = "lvds-encoder",
> - .of_match_table = lvds_encoder_match,
> - },
> -};
> -module_platform_driver(lvds_encoder_driver);
> -
> -MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>");
> -MODULE_DESCRIPTION("Transparent parallel to LVDS encoder");
> -MODULE_LICENSE("GPL");
> --
> 2.7.4
>
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