Re: [PATCH] drm/rockchip: Refactor the component match logic.

Sean Paul
2017-03-13T21:06:22Z

On Wed, Mar 08, 2017 at 01:58:14PM +0800, Jeffy Chen wrote:
> Currently we are adding all components from the dts, if one of their
> drivers been disabled, we would not be able to bring up others.
>
> Refactor component match logic, follow exynos drm.
>
> Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
>
> ---
>
> drivers/gpu/drm/rockchip/Kconfig | 10 +-
> drivers/gpu/drm/rockchip/Makefile | 16 +--
> drivers/gpu/drm/rockchip/analogix_dp-rockchip.c | 9 +-
> drivers/gpu/drm/rockchip/cdn-dp-core.c | 8 +-
> drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 8 +-
> drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c | 10 +-
> drivers/gpu/drm/rockchip/inno_hdmi.c | 10 +-
> drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 156 ++++++++++++++++--------
> drivers/gpu/drm/rockchip/rockchip_drm_drv.h | 6 +
> drivers/gpu/drm/rockchip/rockchip_vop_reg.c | 8 +-
> 10 files changed, 133 insertions(+), 108 deletions(-)
>
> diff --git a/drivers/gpu/drm/rockchip/Kconfig b/drivers/gpu/drm/rockchip/Kconfig
> index 0e4eb84..50c41c0 100644
> --- a/drivers/gpu/drm/rockchip/Kconfig
> +++ b/drivers/gpu/drm/rockchip/Kconfig
> @@ -13,7 +13,7 @@ config DRM_ROCKCHIP
> IP found on the SoC.
>
> config ROCKCHIP_ANALOGIX_DP
> - tristate "Rockchip specific extensions for Analogix DP driver"
> + bool "Rockchip specific extensions for Analogix DP driver"
> depends on DRM_ROCKCHIP
> select DRM_ANALOGIX_DP
> help
> @@ -22,7 +22,7 @@ config ROCKCHIP_ANALOGIX_DP
> on RK3288 based SoC, you should selet this option.
>
> config ROCKCHIP_CDN_DP
> - tristate "Rockchip cdn DP"
> + bool "Rockchip cdn DP"
> depends on DRM_ROCKCHIP
> depends on EXTCON
> select SND_SOC_HDMI_CODEC if SND_SOC
> @@ -33,7 +33,7 @@ config ROCKCHIP_CDN_DP
> option.
>
> config ROCKCHIP_DW_HDMI
> - tristate "Rockchip specific extensions for Synopsys DW HDMI"
> + bool "Rockchip specific extensions for Synopsys DW HDMI"
> depends on DRM_ROCKCHIP
> select DRM_DW_HDMI
> help
> @@ -43,7 +43,7 @@ config ROCKCHIP_DW_HDMI
> option.
>
> config ROCKCHIP_DW_MIPI_DSI
> - tristate "Rockchip specific extensions for Synopsys DW MIPI DSI"
> + bool "Rockchip specific extensions for Synopsys DW MIPI DSI"
> depends on DRM_ROCKCHIP
> select DRM_MIPI_DSI
> help
> @@ -53,7 +53,7 @@ config ROCKCHIP_DW_MIPI_DSI
> option.
>
> config ROCKCHIP_INNO_HDMI
> - tristate "Rockchip specific extensions for Innosilicon HDMI"
> + bool "Rockchip specific extensions for Innosilicon HDMI"
> depends on DRM_ROCKCHIP
> help
> This selects support for Rockchip SoC specific extensions
> diff --git a/drivers/gpu/drm/rockchip/Makefile b/drivers/gpu/drm/rockchip/Makefile
> index c931e2a..fa8dc9d 100644
> --- a/drivers/gpu/drm/rockchip/Makefile
> +++ b/drivers/gpu/drm/rockchip/Makefile
> @@ -3,14 +3,14 @@
> # Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.
>
> rockchipdrm-y := rockchip_drm_drv.o rockchip_drm_fb.o \
> - rockchip_drm_gem.o rockchip_drm_psr.o rockchip_drm_vop.o
> + rockchip_drm_gem.o rockchip_drm_psr.o \
> + rockchip_drm_vop.o rockchip_vop_reg.o
> rockchipdrm-$(CONFIG_DRM_FBDEV_EMULATION) += rockchip_drm_fbdev.o
>
> -obj-$(CONFIG_ROCKCHIP_ANALOGIX_DP) += analogix_dp-rockchip.o
> -obj-$(CONFIG_ROCKCHIP_CDN_DP) += cdn-dp.o
> -cdn-dp-objs := cdn-dp-core.o cdn-dp-reg.o
> -obj-$(CONFIG_ROCKCHIP_DW_HDMI) += dw_hdmi-rockchip.o
> -obj-$(CONFIG_ROCKCHIP_DW_MIPI_DSI) += dw-mipi-dsi.o
> -obj-$(CONFIG_ROCKCHIP_INNO_HDMI) += inno_hdmi.o
> +rockchipdrm-$(CONFIG_ROCKCHIP_ANALOGIX_DP) += analogix_dp-rockchip.o
> +rockchipdrm-$(CONFIG_ROCKCHIP_CDN_DP) += cdn-dp-core.o cdn-dp-reg.o
> +rockchipdrm-$(CONFIG_ROCKCHIP_DW_HDMI) += dw_hdmi-rockchip.o
> +rockchipdrm-$(CONFIG_ROCKCHIP_DW_MIPI_DSI) += dw-mipi-dsi.o
> +rockchipdrm-$(CONFIG_ROCKCHIP_INNO_HDMI) += inno_hdmi.o
>
> -obj-$(CONFIG_DRM_ROCKCHIP) += rockchipdrm.o rockchip_vop_reg.o
> +obj-$(CONFIG_DRM_ROCKCHIP) += rockchipdrm.o
> diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> index 8548e82..91ebe5c 100644
> --- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> +++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> @@ -507,7 +507,7 @@ static const struct of_device_id rockchip_dp_dt_ids[] = {
> };
> MODULE_DEVICE_TABLE(of, rockchip_dp_dt_ids);
>
> -static struct platform_driver rockchip_dp_driver = {
> +struct platform_driver rockchip_dp_driver = {
> .probe = rockchip_dp_probe,
> .remove = rockchip_dp_remove,
> .driver = {
> @@ -516,10 +516,3 @@ static struct platform_driver rockchip_dp_driver = {
> .of_match_table = of_match_ptr(rockchip_dp_dt_ids),
> },
> };
> -
> -module_platform_driver(rockchip_dp_driver);
> -
> -MODULE_AUTHOR("Yakir Yang <ykk@rock-chips.com>");
> -MODULE_AUTHOR("Jeff chen <jeff.chen@rock-chips.com>");
> -MODULE_DESCRIPTION("Rockchip Specific Analogix-DP Driver Extension");
> -MODULE_LICENSE("GPL v2");
> diff --git a/drivers/gpu/drm/rockchip/cdn-dp-core.c b/drivers/gpu/drm/rockchip/cdn-dp-core.c
> index fd79a70..e1796d0 100644
> --- a/drivers/gpu/drm/rockchip/cdn-dp-core.c
> +++ b/drivers/gpu/drm/rockchip/cdn-dp-core.c
> @@ -1243,7 +1243,7 @@ static const struct dev_pm_ops cdn_dp_pm_ops = {
> cdn_dp_resume)
> };
>
> -static struct platform_driver cdn_dp_driver = {
> +struct platform_driver cdn_dp_driver = {
> .probe = cdn_dp_probe,
> .remove = cdn_dp_remove,
> .shutdown = cdn_dp_shutdown,
> @@ -1254,9 +1254,3 @@ static struct platform_driver cdn_dp_driver = {
> .pm = &cdn_dp_pm_ops,
> },
> };
> -
> -module_platform_driver(cdn_dp_driver);
> -
> -MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
> -MODULE_DESCRIPTION("cdn DP Driver");
> -MODULE_LICENSE("GPL v2");
> diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> index d9aa382..65a474f 100644
> --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
> @@ -1165,7 +1165,7 @@ static int dw_mipi_dsi_remove(struct platform_device *pdev)
> return 0;
> }
>
> -static struct platform_driver dw_mipi_dsi_driver = {
> +struct platform_driver dw_mipi_dsi_driver = {
> .probe = dw_mipi_dsi_probe,
> .remove = dw_mipi_dsi_remove,
> .driver = {
> @@ -1173,9 +1173,3 @@ static struct platform_driver dw_mipi_dsi_driver = {
> .name = DRIVER_NAME,
> },
> };
> -module_platform_driver(dw_mipi_dsi_driver);
> -
> -MODULE_DESCRIPTION("ROCKCHIP MIPI DSI host controller driver");
> -MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
> -MODULE_LICENSE("GPL");
> -MODULE_ALIAS("platform:" DRIVER_NAME);
> diff --git a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
> index a6d4a02..976ea79 100644
> --- a/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
> +++ b/drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
> @@ -326,7 +326,7 @@ static int dw_hdmi_rockchip_remove(struct platform_device *pdev)
> return 0;
> }
>
> -static struct platform_driver dw_hdmi_rockchip_pltfm_driver = {
> +struct platform_driver dw_hdmi_rockchip_pltfm_driver = {
> .probe = dw_hdmi_rockchip_probe,
> .remove = dw_hdmi_rockchip_remove,
> .driver = {
> @@ -334,11 +334,3 @@ static struct platform_driver dw_hdmi_rockchip_pltfm_driver = {
> .of_match_table = dw_hdmi_rockchip_dt_ids,
> },
> };
> -
> -module_platform_driver(dw_hdmi_rockchip_pltfm_driver);
> -
> -MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com>");
> -MODULE_AUTHOR("Yakir Yang <ykk@rock-chips.com>");
> -MODULE_DESCRIPTION("Rockchip Specific DW-HDMI Driver Extension");
> -MODULE_LICENSE("GPL");
> -MODULE_ALIAS("platform:dwhdmi-rockchip");
> diff --git a/drivers/gpu/drm/rockchip/inno_hdmi.c b/drivers/gpu/drm/rockchip/inno_hdmi.c
> index 006260d..7d9b75e 100644
> --- a/drivers/gpu/drm/rockchip/inno_hdmi.c
> +++ b/drivers/gpu/drm/rockchip/inno_hdmi.c
> @@ -923,7 +923,7 @@ static const struct of_device_id inno_hdmi_dt_ids[] = {
> };
> MODULE_DEVICE_TABLE(of, inno_hdmi_dt_ids);
>
> -static struct platform_driver inno_hdmi_driver = {
> +struct platform_driver inno_hdmi_driver = {
> .probe = inno_hdmi_probe,
> .remove = inno_hdmi_remove,
> .driver = {
> @@ -931,11 +931,3 @@ static struct platform_driver inno_hdmi_driver = {
> .of_match_table = inno_hdmi_dt_ids,
> },
> };
> -
> -module_platform_driver(inno_hdmi_driver);
> -
> -MODULE_AUTHOR("Zheng Yang <zhengyang@rock-chips.com>");
> -MODULE_AUTHOR("Yakir Yang <ykk@rock-chips.com>");
> -MODULE_DESCRIPTION("Rockchip Specific INNO-HDMI Driver");
> -MODULE_LICENSE("GPL v2");
> -MODULE_ALIAS("platform:innohdmi-rockchip");
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> index b360e62..c0dae3b 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> @@ -356,34 +356,49 @@ static const struct dev_pm_ops rockchip_drm_pm_ops = {
> rockchip_drm_sys_resume)
> };
>
> -static int compare_of(struct device *dev, void *data)
> -{
> - struct device_node *np = data;
> +static struct platform_driver *rockchip_drm_comp_drvs[] = {
> + &vop_platform_driver,
> +#ifdef CONFIG_ROCKCHIP_ANALOGIX_DP
> + &rockchip_dp_driver,
> +#endif
> +#ifdef CONFIG_ROCKCHIP_CDN_DP
> + &cdn_dp_driver,
> +#endif
> +#ifdef CONFIG_ROCKCHIP_DW_HDMI
> + &dw_hdmi_rockchip_pltfm_driver,
> +#endif
> +#ifdef CONFIG_ROCKCHIP_DW_MIPI_DSI
> + &dw_mipi_dsi_driver,
> +#endif
> +#ifdef CONFIG_ROCKCHIP_INNO_HDMI
> + &inno_hdmi_driver,
> +#endif
> +};
>
> - return dev->of_node == np;
> +static int compare_dev(struct device *dev, void *data)
> +{
> + return dev == (struct device *)data;
> }
>
> -static void rockchip_add_endpoints(struct device *dev,
> - struct component_match **match,
> - struct device_node *port)
> +static struct component_match *rockchip_drm_match_add(struct device *dev)
> {
> - struct device_node *ep, *remote;
> + struct component_match *match = NULL;
> + int i;
>
> - for_each_child_of_node(port, ep) {
> - remote = of_graph_get_remote_port_parent(ep);
> - if (!remote || !of_device_is_available(remote)) {
> - of_node_put(remote);
> - continue;
> - } else if (!of_device_is_available(remote->parent)) {
> - dev_warn(dev, "parent device of %s is not available\n",
> - remote->full_name);
> - of_node_put(remote);
> - continue;
> - }
> + for (i = 0; i < ARRAY_SIZE(rockchip_drm_comp_drvs); i++) {
> + struct platform_driver *drv = rockchip_drm_comp_drvs[i];
> + struct device *p = NULL, *d;
>
> - drm_of_component_match_add(dev, match, compare_of, remote);
> - of_node_put(remote);
> + while ((d = bus_find_device(&platform_bus_type, p, &drv->driver,
> + (void *)platform_bus_type.match))) {
> + put_device(p);
> + component_match_add(dev, &match, compare_dev, d);
> + p = d;
> + }
> + put_device(p);

I think you could move the bus_find_device() inside the loop and just have
put_device in one place. I spent more time than I would have liked trying to
rationalize why there was an extra put.

> }
> +
> + return match ?: ERR_PTR(-ENODEV);
> }
>
> static const struct component_master_ops rockchip_drm_ops = {
> @@ -391,21 +406,16 @@ static const struct component_master_ops rockchip_drm_ops = {
> .unbind = rockchip_drm_unbind,
> };
>
> -static int rockchip_drm_platform_probe(struct platform_device *pdev)
> +static int rockchip_drm_platform_of_probe(struct device *dev)
> {
> - struct device *dev = &pdev->dev;
> - struct component_match *match = NULL;
> struct device_node *np = dev->of_node;
> struct device_node *port;
> + bool found = false;
> int i;
>
> if (!np)
> return -ENODEV;
> - /*
> - * Bind the crtc ports first, so that
> - * drm_of_find_possible_crtcs called from encoder .bind callbacks
> - * works as expected.
> - */
> +
> for (i = 0;; i++) {
> struct device_node *iommu;
>
> @@ -429,9 +439,9 @@ static int rockchip_drm_platform_probe(struct platform_device *pdev)
> is_support_iommu = false;
> }
>
> + found = true;
> +
> of_node_put(iommu);
> - drm_of_component_match_add(dev, &match, compare_of,
> - port->parent);
> of_node_put(port);
> }
>
> @@ -440,27 +450,27 @@ static int rockchip_drm_platform_probe(struct platform_device *pdev)
> return -ENODEV;
> }
>
> - if (!match) {
> + if (!found) {
> dev_err(dev, "No available vop found for display-subsystem.\n");
> return -ENODEV;
> }
> - /*
> - * For each bound crtc, bind the encoders attached to its
> - * remote endpoint.
> - */
> - for (i = 0;; i++) {
> - port = of_parse_phandle(np, "ports", i);
> - if (!port)
> - break;
>
> - if (!of_device_is_available(port->parent)) {
> - of_node_put(port);
> - continue;
> - }
> + return 0;
> +}
>
> - rockchip_add_endpoints(dev, &match, port);
> - of_node_put(port);
> - }
> +static int rockchip_drm_platform_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct component_match *match = NULL;
> + int ret;
> +
> + ret = rockchip_drm_platform_of_probe(dev);
> + if (ret)
> + return ret;
> +
> + match = rockchip_drm_match_add(dev);
> + if (IS_ERR(match))
> + return PTR_ERR(match);
>
> return component_master_add_with_match(dev, &rockchip_drm_ops, match);
> }
> @@ -488,7 +498,57 @@ static struct platform_driver rockchip_drm_platform_driver = {
> },
> };
>
> -module_platform_driver(rockchip_drm_platform_driver);
> +static void rockchip_drm_unregister_drivers(void)
> +{
> + int i;
> +
> + for (i = ARRAY_SIZE(rockchip_drm_comp_drvs) - 1; i >= 0; i--)
> + platform_driver_unregister(rockchip_drm_comp_drvs[i]);
> +}
> +
> +static int rockchip_drm_register_drivers(void)
> +{
> + int i, ret;
> +
> + for (i = 0; i < ARRAY_SIZE(rockchip_drm_comp_drvs); i++) {
> + ret = platform_driver_register(rockchip_drm_comp_drvs[i]);
> + if (ret)
> + goto fail;
> + }
> + return 0;
> +fail:
> + rockchip_drm_unregister_drivers();

Are you sure you can call this for the drivers that have not yet been
registered? I took a quick look in the platform_driver code and it seems like
this might cause a device reference imbalance, at the least.

> + return ret;
> +}
> +
> +static int __init rockchip_drm_init(void)
> +{
> + int ret;
> +
> + ret = rockchip_drm_register_drivers();
> + if (ret)
> + return ret;
> +
> + ret = platform_driver_register(&rockchip_drm_platform_driver);
> + if (ret)
> + goto err_unreg_drivers;
> +
> + return 0;
> +
> +err_unreg_drivers:
> + rockchip_drm_unregister_drivers();
> + return ret;
> +}
> +
> +static void __exit rockchip_drm_fini(void)
> +{
> + platform_driver_unregister(&rockchip_drm_platform_driver);
> +
> + rockchip_drm_unregister_drivers();
> +}
> +
> +module_init(rockchip_drm_init);
> +module_exit(rockchip_drm_fini);
>
> MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
> MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
> index adc3930..f46e1d0 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
> @@ -79,4 +79,10 @@ void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
> int rockchip_drm_wait_line_flag(struct drm_crtc *crtc, unsigned int line_num,
> unsigned int mstimeout);
>
> +extern struct platform_driver cdn_dp_driver;
> +extern struct platform_driver dw_hdmi_rockchip_pltfm_driver;
> +extern struct platform_driver dw_mipi_dsi_driver;
> +extern struct platform_driver inno_hdmi_driver;
> +extern struct platform_driver rockchip_dp_driver;
> +extern struct platform_driver vop_platform_driver;

Should these be protected by #ifdef CONFIG_*?

> #endif /* _ROCKCHIP_DRM_DRV_H_ */
> diff --git a/drivers/gpu/drm/rockchip/rockchip_vop_reg.c b/drivers/gpu/drm/rockchip/rockchip_vop_reg.c
> index 91fbc7b..0da4444 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_vop_reg.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_vop_reg.c
> @@ -404,7 +404,7 @@ static int vop_remove(struct platform_device *pdev)
> return 0;
> }
>
> -static struct platform_driver vop_platform_driver = {
> +struct platform_driver vop_platform_driver = {
> .probe = vop_probe,
> .remove = vop_remove,
> .driver = {
> @@ -412,9 +412,3 @@ static struct platform_driver vop_platform_driver = {
> .of_match_table = of_match_ptr(vop_driver_dt_match),
> },
> };
> -
> -module_platform_driver(vop_platform_driver);
> -
> -MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
> -MODULE_DESCRIPTION("ROCKCHIP VOP Driver");
> -MODULE_LICENSE("GPL v2");
> --
> 2.1.4
>
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