Re: [RFC PATCH 2/8] drm: exynos/dp: convert to drm bridge mode

Jingoo Han
2015-08-06T14:19:56Z

On Thursday, August 06, 2015 11:07 PM, Yakir Yang wrote:
>
> In order to move exynos dp code to bridge directory,
> we need to convert driver drm bridge mode first. As
> dp driver already have a ptn3460 bridge, so we need
> to move ptn bridge to the next bridge of dp bridge.
>
> Signed-off-by: Yakir Yang <ykk@rock-chips.com>
> ---
> drivers/gpu/drm/exynos/exynos_dp_core.c | 196 ++++++++++++++++++++------------
> drivers/gpu/drm/exynos/exynos_dp_core.h | 2 +
> 2 files changed, 126 insertions(+), 72 deletions(-)
>
> diff --git a/drivers/gpu/drm/exynos/exynos_dp_core.c b/drivers/gpu/drm/exynos/exynos_dp_core.c
> index a8097a4..aa99e23 100644
> --- a/drivers/gpu/drm/exynos/exynos_dp_core.c
> +++ b/drivers/gpu/drm/exynos/exynos_dp_core.c
> @@ -3,6 +3,7 @@
> *
> * Copyright (C) 2012 Samsung Electronics Co., Ltd.
> * Author: Jingoo Han <jg1.han@samsung.com>
> + * Yakir Yang <ykk@rock-chips.com>

Please don't add this.
You just fixed some parts of this code. I don't find the reason
why you have to be added to author for this file.
If you want the title for an author, please send the patch
for a new IP, instead of modifying the exiting codes.

> *
> * This program is free software; you can redistribute it and/or modify it
> * under the terms of the GNU General Public License as published by the
> @@ -998,59 +999,6 @@ static struct drm_connector_helper_funcs exynos_dp_connector_helper_funcs = {
> .best_encoder = exynos_dp_best_encoder,
> };
>
> -/* returns the number of bridges attached */
> -static int exynos_drm_attach_lcd_bridge(struct exynos_dp_device *dp,
> - struct drm_encoder *encoder)
> -{
> - int ret;
> -
> - encoder->bridge = dp->bridge;
> - dp->bridge->encoder = encoder;
> - ret = drm_bridge_attach(encoder->dev, dp->bridge);
> - if (ret) {
> - DRM_ERROR("Failed to attach bridge to drm\n");
> - return ret;
> - }
> -
> - return 0;
> -}
> -
> -static int exynos_dp_create_connector(struct exynos_drm_display *display,
> - struct drm_encoder *encoder)
> -{
> - struct exynos_dp_device *dp = display_to_dp(display);
> - struct drm_connector *connector = &dp->connector;
> - int ret;
> -
> - dp->encoder = encoder;
> -
> - /* Pre-empt DP connector creation if there's a bridge */
> - if (dp->bridge) {
> - ret = exynos_drm_attach_lcd_bridge(dp, encoder);
> - if (!ret)
> - return 0;
> - }
> -
> - connector->polled = DRM_CONNECTOR_POLL_HPD;
> -
> - ret = drm_connector_init(dp->drm_dev, connector,
> - &exynos_dp_connector_funcs,
> - DRM_MODE_CONNECTOR_eDP);
> - if (ret) {
> - DRM_ERROR("Failed to initialize connector with drm\n");
> - return ret;
> - }
> -
> - drm_connector_helper_add(connector, &exynos_dp_connector_helper_funcs);
> - drm_connector_register(connector);
> - drm_mode_connector_attach_encoder(connector, encoder);
> -
> - if (dp->panel)
> - ret = drm_panel_attach(dp->panel, &dp->connector);
> -
> - return ret;
> -}
> -
> static void exynos_dp_phy_init(struct exynos_dp_device *dp)
> {
> if (dp->phy)
> @@ -1115,23 +1063,126 @@ static void exynos_dp_poweroff(struct exynos_dp_device *dp)
> }
> }
>
> -static void exynos_dp_dpms(struct exynos_drm_display *display, int mode)
> +/* returns the number of bridges attached */
> +static int exynos_drm_attach_lcd_bridge(struct exynos_dp_device *dp,
> + struct drm_encoder *encoder)
> +{
> + int ret;
> +
> + dp->bridge->next = dp->ptn_bridge;
> + dp->bridge->encoder = encoder;
> + ret = drm_bridge_attach(encoder->dev, dp->bridge);
> + if (ret) {
> + DRM_ERROR("Failed to attach ptn bridge to drm\n");
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int exynos_dp_bridge_attach(struct drm_bridge *bridge)
> +{
> +
> + struct exynos_dp_device *dp = bridge->driver_private;
> + struct drm_encoder *encoder = dp->encoder;
> + struct drm_connector *connector = &dp->connector;
> + int ret;
> +
> + if (!bridge->encoder) {
> + DRM_ERROR("Parent encoder object not found");
> + return -ENODEV;
> + }
> +
> + encoder->bridge = bridge;
> +
> + /* Pre-empt DP connector creation if there's a bridge */
> + if (dp->ptn_bridge) {
> + ret = exynos_drm_attach_lcd_bridge(dp, encoder);
> + if (ret)
> + return -ENODEV;
> + }
> +
> + connector->polled = DRM_CONNECTOR_POLL_HPD;
> +
> + ret = drm_connector_init(dp->drm_dev, connector,
> + &exynos_dp_connector_funcs, DRM_MODE_CONNECTOR_eDP);
> + if (ret) {
> + DRM_ERROR("Failed to initialize connector with drm\n");
> + return ret;
> + }
> +
> + drm_connector_helper_add(connector, &exynos_dp_connector_helper_funcs);
> + drm_connector_register(connector);
> + drm_mode_connector_attach_encoder(connector, encoder);
> +
> + if (dp->panel)
> + ret = drm_panel_attach(dp->panel, &dp->connector);
> +
> + return ret;
> +}
> +
> +static void exynos_dp_bridge_nop(struct drm_bridge *bridge)
> +{
> + /* do nothing */
> +}
> +
> +static void exynos_dp_bridge_enable(struct drm_bridge *bridge)
> +{
> + struct exynos_dp_device *dp = bridge->driver_private;
> +
> + exynos_dp_poweron(dp);
> + dp->dpms_mode = DRM_MODE_DPMS_ON;
> +}
> +
> +static void exynos_dp_bridge_disable(struct drm_bridge *bridge)
> +{
> + struct exynos_dp_device *dp = bridge->driver_private;
> +
> + exynos_dp_poweroff(dp);
> + dp->dpms_mode = DRM_MODE_DPMS_OFF;
> +}
> +
> +static const struct drm_bridge_funcs exynos_dp_bridge_funcs = {
> + .enable = exynos_dp_bridge_enable,
> + .disable = exynos_dp_bridge_disable,
> + .pre_enable = exynos_dp_bridge_nop,
> + .post_disable = exynos_dp_bridge_nop,
> + .attach = exynos_dp_bridge_attach,
> +};
> +
> +static int exynos_dp_create_connector(struct exynos_drm_display *display,
> + struct drm_encoder *encoder)
> {
> struct exynos_dp_device *dp = display_to_dp(display);
> + struct drm_device *drm_dev = dp->drm_dev;
> + struct drm_bridge *bridge;
> + int ret;
>
> - switch (mode) {
> - case DRM_MODE_DPMS_ON:
> - exynos_dp_poweron(dp);
> - break;
> - case DRM_MODE_DPMS_STANDBY:
> - case DRM_MODE_DPMS_SUSPEND:
> - case DRM_MODE_DPMS_OFF:
> - exynos_dp_poweroff(dp);
> - break;
> - default:
> - break;
> + bridge = devm_kzalloc(drm_dev->dev, sizeof(*bridge), GFP_KERNEL);
> + if (!bridge) {
> + DRM_ERROR("failed to allocate for drm bridge\n");
> + return -ENOMEM;
> }
> - dp->dpms_mode = mode;
> +
> + dp->bridge = bridge;
> + dp->encoder = encoder;
> +
> + bridge->driver_private = dp;
> + bridge->encoder = dp->encoder;
> + bridge->funcs = &exynos_dp_bridge_funcs;
> +
> + ret = drm_bridge_attach(drm_dev, bridge);
> + if (ret) {
> + DRM_ERROR("failed to attach drm bridge\n");
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static void exynos_dp_dpms(struct exynos_drm_display *display, int mode)
> +{
> + /* do nothing */
> }
>
> static struct exynos_drm_display_ops exynos_dp_display_ops = {
> @@ -1243,7 +1294,7 @@ static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
> }
> }
>
> - if (!dp->panel && !dp->bridge) {
> + if (!dp->panel && !dp->ptn_bridge) {
> ret = exynos_dp_dt_parse_panel(dp);
> if (ret)
> return ret;
> @@ -1316,7 +1367,7 @@ static void exynos_dp_unbind(struct device *dev, struct device *master,
> {
> struct exynos_dp_device *dp = dev_get_drvdata(dev);
>
> - exynos_dp_dpms(&dp->display, DRM_MODE_DPMS_OFF);
> + exynos_dp_bridge_disable(dp->bridge);
> }
>
> static const struct component_ops exynos_dp_ops = {
> @@ -1351,9 +1402,9 @@ static int exynos_dp_probe(struct platform_device *pdev)
> if (endpoint) {
> bridge_node = of_graph_get_remote_port_parent(endpoint);
> if (bridge_node) {
> - dp->bridge = of_drm_find_bridge(bridge_node);
> + dp->ptn_bridge = of_drm_find_bridge(bridge_node);
> of_node_put(bridge_node);
> - if (!dp->bridge)
> + if (!dp->ptn_bridge)
> return -EPROBE_DEFER;
> } else {
> return -EPROBE_DEFER;
> @@ -1375,7 +1426,7 @@ static int exynos_dp_suspend(struct device *dev)
> {
> struct exynos_dp_device *dp = dev_get_drvdata(dev);
>
> - exynos_dp_dpms(&dp->display, DRM_MODE_DPMS_OFF);
> + exynos_dp_bridge_disable(dp->bridge);
> return 0;
> }
>
> @@ -1383,7 +1434,7 @@ static int exynos_dp_resume(struct device *dev)
> {
> struct exynos_dp_device *dp = dev_get_drvdata(dev);
>
> - exynos_dp_dpms(&dp->display, DRM_MODE_DPMS_ON);
> + exynos_dp_bridge_enable(dp->bridge);
> return 0;
> }
> #endif
> @@ -1410,5 +1461,6 @@ struct platform_driver dp_driver = {
> };
>
> MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
> +MODULE_AUTHOR("Yakir Yang <ykk@rock-chips.com>");

The same as above.

> MODULE_DESCRIPTION("Samsung SoC DP Driver");
> MODULE_LICENSE("GPL v2");
> diff --git a/drivers/gpu/drm/exynos/exynos_dp_core.h b/drivers/gpu/drm/exynos/exynos_dp_core.h
> index c321ad5..f2584b8 100644
> --- a/drivers/gpu/drm/exynos/exynos_dp_core.h
> +++ b/drivers/gpu/drm/exynos/exynos_dp_core.h
> @@ -3,6 +3,7 @@
> *
> * Copyright (C) 2012 Samsung Electronics Co., Ltd.
> * Author: Jingoo Han <jg1.han@samsung.com>
> + * Yakir Yang <ykk@rock-chips.com>

The same as above.
Here, you just added 1 line. If we add someone to author
in this way, a lot of people should be added to author.

Best regards,
Jingoo Han

> *
> * This program is free software; you can redistribute it and/or modify it
> * under the terms of the GNU General Public License as published by the
> @@ -154,6 +155,7 @@ struct exynos_dp_device {
> struct drm_encoder *encoder;
> struct drm_panel *panel;
> struct drm_bridge *bridge;
> + struct drm_bridge *ptn_bridge;
> struct clk *clock;
> unsigned int irq;
> void __iomem *reg_base;
> --
> 2.1.2