Re: [PATCH v3] fbdev: claim Cyber2000 SPARC I/O aperture before ioremap

[Chintan Patel <chintanlike@gmail.com>]

On 6/23/26 00:57, Helge Deller wrote:
> On 6/16/26 06:30, Chintan Patel wrote:
>> Claim the memory resource associated with the Cyber2000 SPARC MMIO
>> aperture before accessing it.
>>
>> This is part of the effort to request memory regions in fbdev drivers.
> 
> IMHO this patch doesn't make much sense.
> The PCI regions (e.g. for x86) are already requested one level higher 
> and are being kept reserved.
> This patch here only touches the SPARC code inside a path which is e.g. 
> being used everytime the machine wakes up from sleep (does sparc even 
> suspends?). So, instead here, I think (if you want to make this robust) 
> the region should be reserved e.g. in cyberpro_common_probe(), but I'm 
> not sure if this is even worth the effort....?
> 
> Helge

Hi Helge,

Thanks for the explanation.

That makes sense. I was following the fbdev TODO item to request memory
regions, but I agree that reserving and releasing the region in
cyberpro_pci_enable_mmio() isn't the right lifetime if the function can
be called multiple times.

I'll take a closer look at whether the reservation belongs in
cyberpro_common_probe(). If not, I'll drop this patch.

Thanks,
Chintan