drm/loongson: Error out if no VRAM detected

[yetist]

在 2024/1/21 05:09, Sui JIngfeng 写道:
> Hi,
>
>
> On 2024/1/21 00:07, yetist wrote:
>> Without this patch, my server cannot start the DM. It is a Loongson 
>> 3C5000L server, with both a Loongson display controller and an ASPEED 
>> graphics card.
>>
>>   $ lspci |grep VGA
>>   0000:00:06.1 VGA Compatible Controller: Loongson Technology LLC DC 
>> (Display Controller) (rev 01)
>>   0000:03:00.0 VGA-compatible controller: ASPEED Technology, Inc. 
>> ASPEED Graphics Family (revision 41)
>>
>> When not working, there is the following information in dmesg:
>>
>>   loongson 0000:00:06.1: [drm] Private vram start: 0xe00472a6000, 
>> size: 0MiB
>>   Loongson 0000:00:06.1: [drm] *Error* Request (0MiB) failed
>>
>>
>> Anyway, this patch works fine with my server now, thank you.
>>
>
> Does the sever you are using has a dedicated VRAM for the 0000:00:06.1?
>
This hardware has no VRAM.