[PATCH v7] drm/rockchip: Refactor the component match logic.
jeffy
jeffy.chen at rock-chips.com
Tue Mar 21 20:24:53 PDT 2017
Hi Sean,
On 03/22/2017 03:55 AM, Sean Paul wrote:
> On Tue, Mar 21, 2017 at 02:42:11PM +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 at rock-chips.com>
>> Reviewed-by: Andrzej Hajda <a.hajda at samsung.com>
>> Acked-by: Mark Yao <mark.yao at rock-chips.com>
>> Tested-by: Heiko Stuebner <heiko at sntech.de>
>>
>> ---
>>
>> Changes in v7:
>> Add Heiko Stuebner <heiko at sntech.de>'s Tested-by.
>>
>> Changes in v6:
>> Add Mark Yao <mark.yao at rock-chips.com>'s Acked-by.
>>
>> Changes in v5:
>> Fix compile error reported by Heiko Stuebner <heiko at sntech.de>.
>>
>> Changes in v4:
>> Use platform_driver helpers to register/unregister drivers.
>> Fix null pointer error reported by Heiko Stuebner <heiko at sntech.de>.
>>
>> Changes in v3:
>> Address Andrzej Hajda <a.hajda at samsung.com>'s comments.
>>
>> Changes in v2:
>> Address Sean Paul <seanpaul at chromium.org>'s comments.
>>
>> 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 | 138 +++++++++++++++---------
>> drivers/gpu/drm/rockchip/rockchip_drm_drv.h | 6 ++
>> drivers/gpu/drm/rockchip/rockchip_vop_reg.c | 8 +-
>> 10 files changed, 115 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 at rock-chips.com>");
>> -MODULE_AUTHOR("Jeff chen <jeff.chen at 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 at 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 f84f9ae..9360250 100644
>> --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
>> +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
>> @@ -1304,7 +1304,7 @@ 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 = {
>> @@ -1312,9 +1312,3 @@ 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 at 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 at rock-chips.com>");
>> -MODULE_AUTHOR("Yakir Yang <ykk at 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 at rock-chips.com>");
>> -MODULE_AUTHOR("Yakir Yang <ykk at 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 ccf4569..c4fd077 100644
>> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
>> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
>> @@ -304,34 +304,42 @@ 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;
>> +#define MAX_ROCKCHIP_DRM_DRVS 16
>> +static struct platform_driver *rockchip_drm_drvs[MAX_ROCKCHIP_DRM_DRVS];
>> +static int rockchip_drm_drvs_cnt;
>
> I'm not crazy about the names, can you rename them to be a little more
> descriptive?
>
> MAX_ROCKCHIP_SUB_DRIVERS
> rockchip_sub_drivers
> num_rockchip_sub_drivers
>
done
>>
>> - return dev->of_node == np;
>> +#define ROCKCHIP_DRM_DRV(drv, cond) { \
>
> I think this should move to right above rockchip_drm_init, so it's easier for
> the reader to see what the macro does in context. Also, rename to
> ADD_ROCKCHIP_SUB_DRIVER
>
>> + if (IS_ENABLED(cond)) \
>
> You should probably also ensure you're not going to overrun the array, ie:
>
> if (IS_ENABLED(cond) && \
> !WARN_ON(num_rockchip_sub_drivers >= MAX_ROCKCHIP_SUB_DRIVERS)) \
>
>
done
>> + rockchip_drm_drvs[rockchip_drm_drvs_cnt++] = &drv; \
>> }
>>
>> -static void rockchip_add_endpoints(struct device *dev,
>> - struct component_match **match,
>> - struct device_node *port)
>> +static int compare_dev(struct device *dev, void *data)
>> {
>> - struct device_node *ep, *remote;
>> + return dev == (struct device *)data;
>> +}
>>
>> - 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;
>> - }
>> +static struct component_match *rockchip_drm_match_add(struct device *dev)
>> +{
>> + struct component_match *match = NULL;
>> + int i;
>>
>> - drm_of_component_match_add(dev, match, compare_of, remote);
>> - of_node_put(remote);
>> + for (i = 0; i < rockchip_drm_drvs_cnt; i++) {
>> + struct platform_driver *drv = rockchip_drm_drvs[i];
>> + struct device *p = NULL, *d;
>> +
>> + do {
>> + d = bus_find_device(&platform_bus_type, p, &drv->driver,
>> + (void *)platform_bus_type.match);
>> + put_device(p);
>> + p = d;
>> +
>> + if (!d)
>> + break;
>> + component_match_add(dev, &match, compare_dev, d);
>> + } while (true);
>> }
>> +
>> + return match ?: ERR_PTR(-ENODEV);
>> }
>>
>> static const struct component_master_ops rockchip_drm_ops = {
>> @@ -339,21 +347,16 @@ 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;
>>
>> @@ -377,9 +380,9 @@ 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);
>> }
>>
>> @@ -388,27 +391,27 @@ 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);
>> }
>> @@ -436,7 +439,46 @@ static struct platform_driver rockchip_drm_platform_driver = {
>> },
>> };
>>
>> -module_platform_driver(rockchip_drm_platform_driver);
>> +static int __init rockchip_drm_init(void)
>> +{
>> + int ret;
>> +
>> + rockchip_drm_drvs_cnt = 0;
>> + ROCKCHIP_DRM_DRV(vop_platform_driver, CONFIG_DRM_ROCKCHIP);
>> + ROCKCHIP_DRM_DRV(rockchip_dp_driver, CONFIG_ROCKCHIP_ANALOGIX_DP);
>> + ROCKCHIP_DRM_DRV(cdn_dp_driver, CONFIG_ROCKCHIP_CDN_DP);
>> + ROCKCHIP_DRM_DRV(dw_hdmi_rockchip_pltfm_driver,
>> + CONFIG_ROCKCHIP_DW_HDMI);
>> + ROCKCHIP_DRM_DRV(dw_mipi_dsi_driver, CONFIG_ROCKCHIP_DW_MIPI_DSI);
>> + ROCKCHIP_DRM_DRV(inno_hdmi_driver, CONFIG_ROCKCHIP_INNO_HDMI);
>> +
>> + ret = platform_register_drivers(rockchip_drm_drvs,
>> + rockchip_drm_drvs_cnt);
>> + if (ret)
>> + return ret;
>> +
>> + ret = platform_driver_register(&rockchip_drm_platform_driver);
>> + if (ret)
>> + goto err_unreg_drivers;
>> +
>> + return 0;
>> +
>> +err_unreg_drivers:
>> + platform_unregister_drivers(rockchip_drm_drvs,
>> + rockchip_drm_drvs_cnt);
>> + return ret;
>> +}
>> +
>> +static void __exit rockchip_drm_fini(void)
>> +{
>> + platform_driver_unregister(&rockchip_drm_platform_driver);
>> +
>> + platform_unregister_drivers(rockchip_drm_drvs,
>> + rockchip_drm_drvs_cnt);
>> +}
>> +
>> +module_init(rockchip_drm_init);
>> +module_exit(rockchip_drm_fini);
>>
>> MODULE_AUTHOR("Mark Yao <mark.yao at 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 8aca219..a48fcce 100644
>> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
>> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
>> @@ -65,4 +65,10 @@ 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;
>> #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 at rock-chips.com>");
>> -MODULE_DESCRIPTION("ROCKCHIP VOP Driver");
>> -MODULE_LICENSE("GPL v2");
>> --
>> 2.1.4
>>
>
hmm, i know why i missed compile errors so many times before, upstream
kernel doesn't enable our iommu yet, so rockchip drm doesn't even
compiled on my local upstream kernel tree...
need this:
+++ b/drivers/iommu/Kconfig
@@ -219,7 +219,7 @@ config OMAP_IOMMU_DEBUG
config ROCKCHIP_IOMMU
bool "Rockchip IOMMU Support"
- depends on ARM
+ depends on ARM || ARM64
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