Re: drm/loongson: Error out if no VRAM detected

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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?

If not, the driver shouldn't be probed. This also means that the 0000:00:06.1
(Display Controller) shouldn't be detected by Linux kernel, because there is
no way for this driver can works correctly on such a case.




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