Re: port-amd64/58657: i915drmkms blank screen

[Taylor R Campbell <riastradh%NetBSD.org@localhost>]

> Date: Thu, 29 Oct 2026 03:49:38 +0800
> From: hoshinomori <hoshinomori%owarisekai.moe@localhost>
> 
> -		bus_space_write_4(execlists->bst, execlists->bsh, execlists->submit_reg + port * 2, lower_32_bits(desc));
> -		bus_space_write_4(execlists->bst, execlists->bsh, execlists->submit_reg + port * 2 + 1, upper_32_bits(desc));
> +		bus_space_write_4(execlists->bst, execlists->bsh, execlists->submit_reg + sizeof(u32) * (port * 2), lower_32_bits(desc));
> +		bus_space_write_4(execlists->bst, execlists->bsh, execlists->submit_reg + sizeof(u32) * (port * 2 + 1), upper_32_bits(desc));

Nice catch!  I figured there would be more bugs of that class but I
didn't find them when I last went searching after turning up one of
them.  I'll take another pass through to look for similar bugs.