linux-kernel - Re: [PATCH v8 6/8] drm/etnaviv: add driver support for the PCI devices

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Message-ID: <ec178d79-f96b-072e-aa1b-dd2bf7c9cdd0@loongson.cn>
Date:   Fri, 9 Jun 2023 09:37:02 +0800
From:   Sui Jingfeng <suijingfeng@...ngson.cn>
To:     Bjorn Helgaas <helgaas@...nel.org>,
        Sui Jingfeng <15330273260@....cn>
Cc:     Lucas Stach <l.stach@...gutronix.de>,
        Russell King <linux+etnaviv@...linux.org.uk>,
        Christian Gmeiner <christian.gmeiner@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Li Yi <liyi@...ngson.cn>,
        linux-kernel@...r.kernel.org, etnaviv@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v8 6/8] drm/etnaviv: add driver support for the PCI
 devices

Hi,

On 2023/6/9 01:32, Bjorn Helgaas wrote:
> On Wed, Jun 07, 2023 at 06:55:49PM +0800, Sui Jingfeng wrote:
>> From: Sui Jingfeng <suijingfeng@...ngson.cn>
>>
>> This patch adds PCI driver support on top of what we already have. Take
>> the GC1000 in LS7A1000/LS2K1000 as the first instance of the PCI device
>> driver. There is only one GPU core for the GC1000 in the LS7A1000 and
>> LS2K1000. Therefore, component frameworks can be avoided.
>> +#ifdef CONFIG_DRM_ETNAVIV_PCI_DRIVER
>> +#include "etnaviv_pci_drv.h"
>> +#endif
> With trivial stubs for etnaviv_register_pci_driver() and
> etnaviv_unregister_pci_driver(), I think you could get rid of all
> these #ifdefs.

OK, then, I will try to add dummy implement at etnaviv_pci_drv.h,

Thanks.

>> +void etnaviv_drm_unbind(struct device *dev, bool component)
>>   {
>>   	struct etnaviv_drm_private *priv = etna_private_ptr;
>>   	struct drm_device *drm = priv->drm;
>> @@ -746,6 +750,12 @@ static int __init etnaviv_init(void)
>>   	if (ret != 0)
>>   		goto unregister_gpu_driver;
>>   
>> +#ifdef CONFIG_DRM_ETNAVIV_PCI_DRIVER
>> +	ret = etnaviv_register_pci_driver();
>> +	if (ret != 0)
>> +		goto unregister_platform_driver;
>> +#endif
>> +
>>   	/*
>>   	 * If the DT contains at least one available GPU device, instantiate
>>   	 * the DRM platform device.
>> @@ -763,7 +773,7 @@ static int __init etnaviv_init(void)
>>   		break;
>>   	}
>>   
>> -	return 0;
>> +	return ret;
>>   
>>   unregister_platform_driver:
>>   	platform_driver_unregister(&etnaviv_platform_driver);
>> @@ -778,6 +788,10 @@ static void __exit etnaviv_exit(void)
>>   	etnaviv_destroy_platform_device(&etnaviv_platform_device);
>>   	platform_driver_unregister(&etnaviv_platform_driver);
>>   	platform_driver_unregister(&etnaviv_gpu_driver);
>> +
>> +#ifdef CONFIG_DRM_ETNAVIV_PCI_DRIVER
>> +	etnaviv_unregister_pci_driver();
>> +#endif
>> +static const struct pci_device_id etnaviv_pci_id_lists[] = {
>> +	{PCI_VENDOR_ID_LOONGSON, 0x7a15, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
>> +	{PCI_VENDOR_ID_LOONGSON, 0x7a05, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
> PCI_VDEVICE()

This make it impossible to hook device-specific data in the future.

But currently there no device specific data associated with the 0x7a05 and 0x7a15,

so it's acceptable for now. Thanks.

> Bjorn

-- 
Jingfeng