Re: [PATCH v6 02/11] drm/hisilicon: Add hisilicon kirin drm master driver

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Hi,

On 26 February 2016 at 16:54, Archit Taneja <architt@xxxxxxxxxxxxxx> wrote:
> Hi,
>
> I had some minor comments. Sorry about sharing this late. Otherwise,
> the looks good to me.

Hi Archit,  you are welcome :-)
Thanks for review again.

>
>
> On 02/26/2016 02:10 PM, Xinliang Liu wrote:
>>
>> Add kirin DRM master driver for hi6220 SoC which used in HiKey board.
>> Add dumb buffer feature.
>> Add prime dmabuf feature.
>>
>> v6: None.
>> v5: None.
>> v4: None.
>> v3:
>> - Move and rename all the files to kirin sub-directory.
>>    So that we could separate different seires SoCs' driver.
>> - Replace drm_platform_init, load, unload implementation.
>> v2:
>> - Remove abtraction layer.
>>
>> Signed-off-by: Xinliang Liu <xinliang.liu@xxxxxxxxxx>
>> ---
>>   drivers/gpu/drm/Kconfig                         |   2 +
>>   drivers/gpu/drm/Makefile                        |   1 +
>>   drivers/gpu/drm/hisilicon/Kconfig               |   5 +
>>   drivers/gpu/drm/hisilicon/Makefile              |   5 +
>>   drivers/gpu/drm/hisilicon/kirin/Kconfig         |   9 +
>>   drivers/gpu/drm/hisilicon/kirin/Makefile        |   3 +
>>   drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c | 321
>> ++++++++++++++++++++++++
>>   drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.h |  20 ++
>>   8 files changed, 366 insertions(+)
>>   create mode 100644 drivers/gpu/drm/hisilicon/Kconfig
>>   create mode 100644 drivers/gpu/drm/hisilicon/Makefile
>>   create mode 100644 drivers/gpu/drm/hisilicon/kirin/Kconfig
>>   create mode 100644 drivers/gpu/drm/hisilicon/kirin/Makefile
>>   create mode 100644 drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
>>   create mode 100644 drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.h
>>
>> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
>> index b50ae60f5f50..f5c5656e2547 100644
>> --- a/drivers/gpu/drm/Kconfig
>> +++ b/drivers/gpu/drm/Kconfig
>> @@ -277,3 +277,5 @@ source "drivers/gpu/drm/imx/Kconfig"
>>   source "drivers/gpu/drm/vc4/Kconfig"
>>
>>   source "drivers/gpu/drm/etnaviv/Kconfig"
>> +
>> +source "drivers/gpu/drm/hisilicon/Kconfig"
>> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
>> index 61766dec6a8d..60554832079c 100644
>> --- a/drivers/gpu/drm/Makefile
>> +++ b/drivers/gpu/drm/Makefile
>> @@ -74,3 +74,4 @@ obj-y                 += panel/
>>   obj-y                 += bridge/
>>   obj-$(CONFIG_DRM_FSL_DCU) += fsl-dcu/
>>   obj-$(CONFIG_DRM_ETNAVIV) += etnaviv/
>> +obj-y                  += hisilicon/
>> diff --git a/drivers/gpu/drm/hisilicon/Kconfig
>> b/drivers/gpu/drm/hisilicon/Kconfig
>> new file mode 100644
>> index 000000000000..558c61b1b8e8
>> --- /dev/null
>> +++ b/drivers/gpu/drm/hisilicon/Kconfig
>> @@ -0,0 +1,5 @@
>> +#
>> +# hisilicon drm device configuration.
>> +# Please keep this list sorted alphabetically
>> +
>> +source "drivers/gpu/drm/hisilicon/kirin/Kconfig"
>> diff --git a/drivers/gpu/drm/hisilicon/Makefile
>> b/drivers/gpu/drm/hisilicon/Makefile
>> new file mode 100644
>> index 000000000000..e3f6d493c996
>> --- /dev/null
>> +++ b/drivers/gpu/drm/hisilicon/Makefile
>> @@ -0,0 +1,5 @@
>> +#
>> +# Makefile for hisilicon drm drivers.
>> +# Please keep this list sorted alphabetically
>> +
>> +obj-$(CONFIG_DRM_HISI_KIRIN) += kirin/
>> diff --git a/drivers/gpu/drm/hisilicon/kirin/Kconfig
>> b/drivers/gpu/drm/hisilicon/kirin/Kconfig
>> new file mode 100644
>> index 000000000000..3ac4b8edeac1
>> --- /dev/null
>> +++ b/drivers/gpu/drm/hisilicon/kirin/Kconfig
>> @@ -0,0 +1,9 @@
>> +config DRM_HISI_KIRIN
>> +       tristate "DRM Support for Hisilicon Kirin series SoCs Platform"
>> +       depends on DRM
>> +       select DRM_KMS_HELPER
>> +       select DRM_GEM_CMA_HELPER
>> +       select DRM_KMS_CMA_HELPER
>> +       help
>> +         Choose this option if you have a hisilicon Kirin
>> chipsets(hi6220).
>> +         If M is selected the module will be called kirin-drm.
>> diff --git a/drivers/gpu/drm/hisilicon/kirin/Makefile
>> b/drivers/gpu/drm/hisilicon/kirin/Makefile
>> new file mode 100644
>> index 000000000000..cb346de47d48
>> --- /dev/null
>> +++ b/drivers/gpu/drm/hisilicon/kirin/Makefile
>> @@ -0,0 +1,3 @@
>> +kirin-drm-y := kirin_drm_drv.o
>> +
>> +obj-$(CONFIG_DRM_HISI_KIRIN) += kirin-drm.o
>> diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
>> b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
>> new file mode 100644
>> index 000000000000..789ebd1f5922
>> --- /dev/null
>> +++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_drv.c
>> @@ -0,0 +1,321 @@
>> +/*
>> + * Hisilicon Kirin SoCs drm master driver
>> + *
>> + * Copyright (c) 2016 Linaro Limited.
>> + * Copyright (c) 2014-2016 Hisilicon Limited.
>> + *
>> + * Author:
>> + *     Xinliang Liu <z.liuxinliang@xxxxxxxxxxxxx>
>> + *     Xinliang Liu <xinliang.liu@xxxxxxxxxx>
>> + *     Xinwei Kong <kong.kongxinwei@xxxxxxxxxxxxx>
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> + *
>> + */
>> +
>> +#include <linux/of_platform.h>
>> +#include <linux/component.h>
>> +#include <linux/of_graph.h>
>> +
>> +#include <drm/drmP.h>
>> +#include <drm/drm_gem_cma_helper.h>
>> +#include <drm/drm_fb_cma_helper.h>
>> +#include <drm/drm_atomic_helper.h>
>> +
>> +#include "kirin_drm_drv.h"
>> +
>> +static struct kirin_dc_ops *dc_ops;
>> +
>> +static int kirin_drm_kms_cleanup(struct drm_device *dev)
>> +{
>> +       dc_ops->cleanup(dev);
>> +       drm_mode_config_cleanup(dev);
>> +
>> +       return 0;
>> +}
>> +
>> +static const struct drm_mode_config_funcs kirin_drm_mode_config_funcs = {
>> +       .fb_create = drm_fb_cma_create,
>> +       .atomic_check = drm_atomic_helper_check,
>> +       .atomic_commit = drm_atomic_helper_commit,
>> +};
>> +
>> +static void kirin_drm_mode_config_init(struct drm_device *dev)
>> +{
>> +       dev->mode_config.min_width = 0;
>> +       dev->mode_config.min_height = 0;
>> +
>> +       dev->mode_config.max_width = 2048;
>> +       dev->mode_config.max_height = 2048;
>> +
>> +       dev->mode_config.funcs = &kirin_drm_mode_config_funcs;
>> +}
>> +
>> +static int kirin_drm_kms_init(struct drm_device *dev)
>> +{
>> +       int ret;
>> +
>> +       dev_set_drvdata(dev->dev, dev);
>> +
>> +       /* dev->mode_config initialization */
>> +       drm_mode_config_init(dev);
>> +       kirin_drm_mode_config_init(dev);
>> +
>> +       /* display controller init */
>> +       ret = dc_ops->init(dev);
>> +       if (ret)
>> +               goto err_mode_config_cleanup;
>> +
>> +       /* bind and init sub drivers */
>> +       ret = component_bind_all(dev->dev, dev);
>> +       if (ret) {
>> +               DRM_ERROR("failed to bind all component.\n");
>> +               goto err_dc_cleanup;
>> +       }
>> +
>> +       /* reset all the states of crtc/plane/encoder/connector */
>> +       drm_mode_config_reset(dev);
>> +
>> +       return 0;
>> +
>> +err_dc_cleanup:
>> +       dc_ops->cleanup(dev);
>> +err_mode_config_cleanup:
>> +       drm_mode_config_cleanup(dev);
>> +
>> +       return ret;
>> +}
>> +
>> +static const struct file_operations kirin_drm_fops = {
>> +       .owner          = THIS_MODULE,
>> +       .open           = drm_open,
>> +       .release        = drm_release,
>> +       .unlocked_ioctl = drm_ioctl,
>> +#ifdef CONFIG_COMPAT
>> +       .compat_ioctl   = drm_compat_ioctl,
>> +#endif
>> +       .poll           = drm_poll,
>> +       .read           = drm_read,
>> +       .llseek         = no_llseek,
>> +       .mmap           = drm_gem_cma_mmap,
>> +};
>> +
>> +static int kirin_gem_cma_dumb_create(struct drm_file *file,
>> +                                    struct drm_device *dev,
>> +                                    struct drm_mode_create_dumb *args)
>> +{
>> +       return drm_gem_cma_dumb_create_internal(file, dev, args);
>> +}
>> +
>> +static struct drm_driver kirin_drm_driver = {
>> +       .driver_features        = DRIVER_GEM | DRIVER_MODESET |
>> DRIVER_PRIME |
>> +                                 DRIVER_ATOMIC,
>> +       .fops                   = &kirin_drm_fops,
>> +       .set_busid              = drm_platform_set_busid,
>> +
>> +       .gem_free_object        = drm_gem_cma_free_object,
>> +       .gem_vm_ops             = &drm_gem_cma_vm_ops,
>> +       .dumb_create            = kirin_gem_cma_dumb_create,
>> +       .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
>> +       .dumb_destroy           = drm_gem_dumb_destroy,
>> +
>> +       .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
>> +       .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
>> +       .gem_prime_export       = drm_gem_prime_export,
>> +       .gem_prime_import       = drm_gem_prime_import,
>> +       .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
>> +       .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
>> +       .gem_prime_vmap         = drm_gem_cma_prime_vmap,
>> +       .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
>> +       .gem_prime_mmap         = drm_gem_cma_prime_mmap,
>> +
>> +       .name                   = "kirin",
>> +       .desc                   = "Hisilicon Kirin SoCs' DRM Driver",
>> +       .date                   = "20150718",
>> +       .major                  = 1,
>> +       .minor                  = 0,
>> +};
>> +
>> +static int compare_of(struct device *dev, void *data)
>> +{
>> +       return dev->of_node == data;
>> +}
>> +
>> +static int kirin_drm_connectors_register(struct drm_device *dev)
>> +{
>> +       struct drm_connector *connector;
>> +       struct drm_connector *failed_connector;
>> +       int ret;
>> +
>
>
> This access needs to be protected by the dev->mode_config.mutex

thanks for pointing out this. will fix in next version.

>
>> +       list_for_each_entry(connector, &dev->mode_config.connector_list,
>> head) {
>
>
> The above can be replaced with:
>
> drm_for_each_connector(connector, dev) {

Great, this makes things more clear. will change in next version.

>
>> +               ret = drm_connector_register(connector);
>> +               if (ret) {
>> +                       failed_connector = connector;
>> +                       goto err;
>> +               }
>> +       }
>> +
>> +       return 0;
>> +
>> +err:
>> +       list_for_each_entry(connector, &dev->mode_config.connector_list,
>> head) {
>> +               if (failed_connector == connector)
>> +                       break;
>> +               drm_connector_unregister(connector);
>> +       }
>
>
> Same points as above.
>
>
>> +
>> +       return ret;
>> +}
>> +
>> +static int kirin_drm_bind(struct device *dev)
>> +{
>> +       struct drm_driver *driver = &kirin_drm_driver;
>> +       struct drm_device *drm_dev;
>> +       int ret;
>> +
>> +       drm_dev = drm_dev_alloc(driver, dev);
>> +       if (!drm_dev)
>> +               return -ENOMEM;
>> +
>> +       drm_dev->platformdev = to_platform_device(dev);
>> +
>> +       ret = kirin_drm_kms_init(drm_dev);
>> +       if (ret)
>> +               goto err_drm_dev_unref;
>> +
>> +       ret = drm_dev_register(drm_dev, 0);
>> +       if (ret)
>> +               goto err_kms_cleanup;
>> +
>> +       /* connectors should be registered after drm device register */
>> +       ret = kirin_drm_connectors_register(drm_dev);
>> +       if (ret)
>> +               goto err_drm_dev_unregister;
>> +
>> +       DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
>> +                driver->name, driver->major, driver->minor,
>> driver->patchlevel,
>> +                driver->date, drm_dev->primary->index);
>> +
>> +       return 0;
>> +
>> +err_drm_dev_unregister:
>> +       drm_dev_unregister(drm_dev);
>> +err_kms_cleanup:
>> +       kirin_drm_kms_cleanup(drm_dev);
>> +err_drm_dev_unref:
>> +       drm_dev_unref(drm_dev);
>> +
>> +       return ret;
>> +}
>> +
>> +static void kirin_drm_unbind(struct device *dev)
>> +{
>> +       drm_put_dev(dev_get_drvdata(dev));
>> +}
>> +
>> +static const struct component_master_ops kirin_drm_ops = {
>> +       .bind = kirin_drm_bind,
>> +       .unbind = kirin_drm_unbind,
>> +};
>> +
>> +static const struct of_device_id kirin_drm_dt_ids[] = {
>> +       { /* end node */ },
>> +};
>> +MODULE_DEVICE_TABLE(of, kirin_drm_dt_ids);
>> +
>> +static int kirin_get_dc_ops(struct device_node *np)
>> +{
>> +       const struct of_device_id *match_id;
>> +
>> +       match_id = of_match_node(kirin_drm_dt_ids, np);
>> +       if (!match_id) {
>> +               DRM_ERROR("failed to match dt id\n");
>> +               return -EINVAL;
>> +       }
>> +
>> +       dc_ops = (struct kirin_dc_ops *)match_id->data;
>> +       if (!dc_ops) {
>> +               DRM_ERROR("dt id data is null\n");
>> +               return -EINVAL;
>> +       }
>
>
> We can use of_device_get_match_data to get the match data,
> and move the kirin_drm_dt_ids table down where the driver is
> defined.
>

Same, it is better to do like you said. will change in next version.

Thanks,
-xinliang

> <snip>
>
> Thanks,
> Archit
>
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> hosted by The Linux Foundation
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