[PATCH v5 11/38] gpu: nova-core: Hopper/Blackwell: skip GFW boot waiting

[John Hubbard]

Hopper and Blackwell GPUs use FSP-based secure boot and do not require
waiting for GFW_BOOT completion. Skip this step for these architectures,
and in fact for all future architectures, because we have moved on:
there will not be any future GPUs using the older GFW_BOOT system.

Cc: Danilo Krummrich <dakr@xxxxxxxxxx>
Signed-off-by: John Hubbard <jhubbard@xxxxxxxxxx>
---
 drivers/gpu/nova-core/gpu.rs | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/nova-core/gpu.rs b/drivers/gpu/nova-core/gpu.rs
index f6af75656861..50bf351b64cc 100644
--- a/drivers/gpu/nova-core/gpu.rs
+++ b/drivers/gpu/nova-core/gpu.rs
@@ -170,6 +170,15 @@ pub(crate) const fn dma_mask(&self) -> DmaMask {
             Self::Hopper | Self::Blackwell => DmaMask::new::<52>(),
         }
     }
+
+    /// Returns whether the GPU uses GFW_BOOT for firmware loading.
+    ///
+    /// Pre-Hopper architectures (Turing, Ampere, Ada) require waiting for GFW_BOOT completion
+    /// before any significant GPU setup. Hopper and later use the FSP Chain of Trust boot path
+    /// instead.
+    pub(crate) const fn needs_gfw_boot(&self) -> bool {
+        matches!(self, Self::Turing | Self::Ampere | Self::Ada)
+    }
 }
 
 impl TryFrom<u8> for Architecture {
@@ -315,11 +324,11 @@ pub(crate) fn new<'a>(
             let chipset = spec.chipset();
 
             Ok(try_pin_init!(Self {
-                // We must wait for GFW_BOOT completion before doing any significant setup
-                // on the GPU.
                 _: {
-                    gfw::wait_gfw_boot_completion(bar)
-                        .inspect_err(|_| dev_err!(pdev, "GFW boot did not complete\n"))?;
+                    if chipset.arch().needs_gfw_boot() {
+                        gfw::wait_gfw_boot_completion(bar)
+                            .inspect_err(|_| dev_err!(pdev, "GFW boot did not complete\n"))?;
+                    }
                 },
 
                 sysmem_flush: SysmemFlush::register(pdev.as_ref(), bar, chipset)?,
-- 
2.53.0