Re: [PATCH v2 06/10] gpu: nova-core: convert PDISP registers to kernel register macro

[Joel Fernandes <joelagnelf@nvidia.com>]

On 3/20/2026 8:19 AM, Alexandre Courbot wrote:
> Convert all PDISP registers to use the kernel's register macro and
> update the code accordingly.
> 
> Reviewed-by: Eliot Courtney <ecourtney@nvidia.com>
> Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
> ---
>  drivers/gpu/nova-core/fb.rs   |  6 +++++-
>  drivers/gpu/nova-core/regs.rs | 12 ++++++++----
>  2 files changed, 13 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/nova-core/fb.rs b/drivers/gpu/nova-core/fb.rs
> index 6536d0035cb1..62fc90fa6a84 100644
> --- a/drivers/gpu/nova-core/fb.rs
> +++ b/drivers/gpu/nova-core/fb.rs
> @@ -8,6 +8,7 @@
>  use kernel::{
>      device,
>      fmt,
> +    io::Io,
>      prelude::*,
>      ptr::{
>          Alignable,
> @@ -189,7 +190,10 @@ pub(crate) fn new(chipset: Chipset, bar: &Bar0, gsp_fw: &GspFirmware) -> Result<
>                  let base = fb.end - NV_PRAMIN_SIZE;
>  
>                  if hal.supports_display(bar) {
> -                    match regs::NV_PDISP_VGA_WORKSPACE_BASE::read(bar).vga_workspace_addr() {
> +                    match bar
> +                        .read(regs::NV_PDISP_VGA_WORKSPACE_BASE)
> +                        .vga_workspace_addr()
> +                    {
>                          Some(addr) => {
>                              if addr < base {
>                                  const VBIOS_WORKSPACE_SIZE: u64 = usize_as_u64(SZ_128K);
> diff --git a/drivers/gpu/nova-core/regs.rs b/drivers/gpu/nova-core/regs.rs
> index 61a8dba22d88..b051d5568cd8 100644
> --- a/drivers/gpu/nova-core/regs.rs
> +++ b/drivers/gpu/nova-core/regs.rs
> @@ -250,10 +250,14 @@ pub(crate) fn usable_fb_size(self) -> u64 {
>  
>  // PDISP
>  
> -register!(NV_PDISP_VGA_WORKSPACE_BASE @ 0x00625f04 {
> -    3:3     status_valid as bool, "Set if the `addr` field is valid";
> -    31:8    addr as u32, "VGA workspace base address divided by 0x10000";
> -});
> +io::register! {
> +    pub(crate) NV_PDISP_VGA_WORKSPACE_BASE(u32) @ 0x00625f04 {
> +        /// VGA workspace base address divided by 0x10000.
> +        31:8    addr;
> +        /// Set if the `addr` field is valid.
> +        3:3     status_valid => bool;
> +    }
> +}

Shouldn't this re-ordering of bit ranges be a separate patch? Also, what did we
conclude on the ordering issue? I remember this was discussed, but I am not sure
what the conclusion was.

Other than that,
Reviewed-by: Joel Fernandes <joelagnelf@nvidia.com>

-- 
Joel Fernandes