Re: [RFC PATCH v3 1/4] drm/exynos: make kms drivers to be independent drivers

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 11/20/2014 02:56 PM, Inki Dae wrote:
> On 2014년 11월 20일 22:19, Andrzej Hajda wrote:
>> On 11/20/2014 11:24 AM, Inki Dae wrote:
>>> This patch makes kms drivers to be independent drivers.
>>> For this, it removes all register codes to kms drivers
>>> from exynos_drm_drv module and adds module_init/exit
>>> for each kms driver so that each kms driver can be
>>> called independently.
>>>
>>> Changelog v3:
>>> - Use module_platform_driver macro instead module_init/exit.
>>> - Configure all kms drivers to be built in kernel image.
>>>
>>> Changelog v2:
>>> - none
>>>
>>> Signed-off-by: Inki Dae <inki.dae@xxxxxxxxxxx>
>>> ---
>>>  drivers/gpu/drm/exynos/exynos_dp_core.c  |    2 ++
>>>  drivers/gpu/drm/exynos/exynos_drm_drv.c  |   43 +++---------------------------
>>>  drivers/gpu/drm/exynos/exynos_drm_drv.h  |    5 ----
>>>  drivers/gpu/drm/exynos/exynos_drm_dsi.c  |    2 ++
>>>  drivers/gpu/drm/exynos/exynos_drm_fimd.c |    2 ++
>>>  drivers/gpu/drm/exynos/exynos_hdmi.c     |    2 ++
>>>  drivers/gpu/drm/exynos/exynos_mixer.c    |    2 ++
>>>  7 files changed, 13 insertions(+), 45 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/exynos/exynos_dp_core.c b/drivers/gpu/drm/exynos/exynos_dp_core.c
>>> index ed818b9..30ebf5d 100644
>>> --- a/drivers/gpu/drm/exynos/exynos_dp_core.c
>>> +++ b/drivers/gpu/drm/exynos/exynos_dp_core.c
>>> @@ -1408,6 +1408,8 @@ struct platform_driver dp_driver = {
>>>  	},
>>>  };
>>>  
>>> +module_platform_driver(dp_driver);
>>
>> If you try to build exynosdrm as module you will receive errors due to
>> multiple definitions of init_module, ie module_init/module_*_driver
>> macros can be used once per module.
> 
> Ah, right. we had ever tried same way before but failed in same problem.
> I didn't realize that. Anyway, I will try to find out a better way. I'd
> really like to remove all register codes of sub drivers from
> exynos_drm_drv somehow.

I have proposed once solution with sparse arrays, using linker scripts
[1]. Something similar is used with clock controllers as I remember.
I do not see other possibilities to fully separate components of
exynos_drm_drv.

[1]: http://permalink.gmane.org/gmane.comp.video.dri.devel/103816

Regards
Andrzej

> 
>>
>> Anyway I am afraid exynosdrm seems to be still fragile to order of
>> successful probes of their components.
>> It can be easily observed on the system with two display pipelines with
>> one of them probe deferring. For example universal with fimd/dpi + vidi:
>> 1. fimd defers probe because panel is not yet probed.
>> 2. vidi probes ok.
>> 3. drmdev is initialized.
>> 4. fimd probes ok, but it is too late!!!
>>
>> So you can reproduce the scenario on any target when one of the
>> components defers and vidi is present (vidi never defers I suppose).
> 
> Thanks for checking,
> Inki Dae
> 
>>
>> Regards
>> Andrzej
>>
>>> +
>>>  MODULE_AUTHOR("Jingoo Han <jg1.han@xxxxxxxxxxx>");
>>>  MODULE_DESCRIPTION("Samsung SoC DP Driver");
>>>  MODULE_LICENSE("GPL v2");
>>> diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
>>> index eab12f0..02d4772 100644
>>> --- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
>>> +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
>>> @@ -484,12 +484,6 @@ static struct component_match *exynos_drm_match_add(struct device *dev)
>>>  
>>>  	mutex_lock(&drm_component_lock);
>>>  
>>> -	/* Do not retry to probe if there is no any kms driver regitered. */
>>> -	if (list_empty(&drm_component_list)) {
>>> -		mutex_unlock(&drm_component_lock);
>>> -		return ERR_PTR(-ENODEV);
>>> -	}
>>> -
>>>  	list_for_each_entry(cdev, &drm_component_list, list) {
>>>  		/*
>>>  		 * Add components to master only in case that crtc and
>>> @@ -545,22 +539,6 @@ static const struct component_master_ops exynos_drm_ops = {
>>>  	.unbind		= exynos_drm_unbind,
>>>  };
>>>  
>>> -static struct platform_driver *const exynos_drm_kms_drivers[] = {
>>> -#ifdef CONFIG_DRM_EXYNOS_FIMD
>>> -	&fimd_driver,
>>> -#endif
>>> -#ifdef CONFIG_DRM_EXYNOS_DP
>>> -	&dp_driver,
>>> -#endif
>>> -#ifdef CONFIG_DRM_EXYNOS_DSI
>>> -	&dsi_driver,
>>> -#endif
>>> -#ifdef CONFIG_DRM_EXYNOS_HDMI
>>> -	&mixer_driver,
>>> -	&hdmi_driver,
>>> -#endif
>>> -};
>>> -
>>>  static struct platform_driver *const exynos_drm_non_kms_drivers[] = {
>>>  #ifdef CONFIG_DRM_EXYNOS_G2D
>>>  	&g2d_driver,
>>> @@ -587,22 +565,14 @@ static int exynos_drm_platform_probe(struct platform_device *pdev)
>>>  	pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
>>>  	exynos_drm_driver.num_ioctls = ARRAY_SIZE(exynos_ioctls);
>>>  
>>> -	for (i = 0; i < ARRAY_SIZE(exynos_drm_kms_drivers); ++i) {
>>> -		ret = platform_driver_register(exynos_drm_kms_drivers[i]);
>>> -		if (ret < 0)
>>> -			goto err_unregister_kms_drivers;
>>> -	}
>>> -
>>>  	match = exynos_drm_match_add(&pdev->dev);
>>> -	if (IS_ERR(match)) {
>>> -		ret = PTR_ERR(match);
>>> -		goto err_unregister_kms_drivers;
>>> -	}
>>> +	if (IS_ERR(match))
>>> +		return PTR_ERR(match);
>>>  
>>>  	ret = component_master_add_with_match(&pdev->dev, &exynos_drm_ops,
>>>  						match);
>>>  	if (ret < 0)
>>> -		goto err_unregister_kms_drivers;
>>> +		return ret;
>>>  
>>>  	for (j = 0; j < ARRAY_SIZE(exynos_drm_non_kms_drivers); ++j) {
>>>  		ret = platform_driver_register(exynos_drm_non_kms_drivers[j]);
>>> @@ -632,10 +602,6 @@ err_unregister_non_kms_drivers:
>>>  err_del_component_master:
>>>  	component_master_del(&pdev->dev, &exynos_drm_ops);
>>>  
>>> -err_unregister_kms_drivers:
>>> -	while (--i >= 0)
>>> -		platform_driver_unregister(exynos_drm_kms_drivers[i]);
>>> -
>>>  	return ret;
>>>  }
>>>  
>>> @@ -654,9 +620,6 @@ static int exynos_drm_platform_remove(struct platform_device *pdev)
>>>  
>>>  	component_master_del(&pdev->dev, &exynos_drm_ops);
>>>  
>>> -	for (i = ARRAY_SIZE(exynos_drm_kms_drivers) - 1; i >= 0; --i)
>>> -		platform_driver_unregister(exynos_drm_kms_drivers[i]);
>>> -
>>>  	return 0;
>>>  }
>>>  
>>> diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h
>>> index 262a459..352a9f9 100644
>>> --- a/drivers/gpu/drm/exynos/exynos_drm_drv.h
>>> +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h
>>> @@ -331,11 +331,6 @@ int exynos_drm_component_add(struct device *dev,
>>>  void exynos_drm_component_del(struct device *dev,
>>>  				enum exynos_drm_device_type dev_type);
>>>  
>>> -extern struct platform_driver fimd_driver;
>>> -extern struct platform_driver dp_driver;
>>> -extern struct platform_driver dsi_driver;
>>> -extern struct platform_driver mixer_driver;
>>> -extern struct platform_driver hdmi_driver;
>>>  extern struct platform_driver exynos_drm_common_hdmi_driver;
>>>  extern struct platform_driver vidi_driver;
>>>  extern struct platform_driver g2d_driver;
>>> diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
>>> index 66d427e..6e34ed5 100644
>>> --- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
>>> +++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
>>> @@ -1799,6 +1799,8 @@ struct platform_driver dsi_driver = {
>>>  	},
>>>  };
>>>  
>>> +module_platform_driver(dsi_driver);
>>> +
>>>  MODULE_AUTHOR("Tomasz Figa <t.figa@xxxxxxxxxxx>");
>>>  MODULE_AUTHOR("Andrzej Hajda <a.hajda@xxxxxxxxxxx>");
>>>  MODULE_DESCRIPTION("Samsung SoC MIPI DSI Master");
>>> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
>>> index 0673a39..3e47625 100644
>>> --- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
>>> +++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
>>> @@ -1240,3 +1240,5 @@ struct platform_driver fimd_driver = {
>>>  		.of_match_table = fimd_driver_dt_match,
>>>  	},
>>>  };
>>> +
>>> +module_platform_driver(fimd_driver);
>>> diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
>>> index 563a19e..d9bfb33 100644
>>> --- a/drivers/gpu/drm/exynos/exynos_hdmi.c
>>> +++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
>>> @@ -2537,3 +2537,5 @@ struct platform_driver hdmi_driver = {
>>>  		.of_match_table = hdmi_match_types,
>>>  	},
>>>  };
>>> +
>>> +module_platform_driver(hdmi_driver);
>>> diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
>>> index a41c84e..599c0cc 100644
>>> --- a/drivers/gpu/drm/exynos/exynos_mixer.c
>>> +++ b/drivers/gpu/drm/exynos/exynos_mixer.c
>>> @@ -1349,3 +1349,5 @@ struct platform_driver mixer_driver = {
>>>  	.remove = mixer_remove,
>>>  	.id_table	= mixer_driver_types,
>>>  };
>>> +
>>> +module_platform_driver(mixer_driver);
>>>
>>
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in
>> the body of a message to majordomo@xxxxxxxxxxxxxxx
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>
> 

--
To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Linux SoC Development]     [Linux Rockchip Development]     [Linux USB Development]     [Video for Linux]     [Linux Audio Users]     [Linux SCSI]     [Yosemite News]

  Powered by Linux