drm/loongson: Error out if no VRAM detected

[Sui JIngfeng]

Hi,


On 2024/1/20 20:01, Katyusha wrote:
>
> Hi,
>
> This patch works fine with my Loongson 3A5000M laptop (L71), which has 
> a 7A1000 chipset without VRAM.
>
>

Can you give more details about the hardware configuration about this laptop?
For example, by using 'lspci | grep VGA' command. I want to make sure if the
integrated display controller are there.


Normally, the integrated graphics should not be used if there is no dedicated
VRAM equipped. And the platform BIOS should disable it.