drm/tyr: use IoMem directly instead of Devres

Now that IoMem is lifetime-parameterized, use it directly in probe
rather than wrapping it in Devres and Arc. The I/O memory mapping is
only used during probe and not stored in driver data, so device-managed
revocation is unnecessary.

This removes the Devres access(dev) pattern from issue_soft_reset(),
GpuInfo::new(), and l2_power_on(), simplifying register access.

Reviewed-by: Eliot Courtney <ecourtney@nvidia.com>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Tested-by: Deborah Brouwer <deborah.brouwer@collabora.com>
Link: https://patch.msgid.link/20260529000106.2257996-3-dakr@kernel.org
Signed-off-by: Alice Ryhl <aliceryhl@google.com>

Author: Danilo Krummrich

drivers/gpu/drm/tyr/driver.rs

@@ -6,11 +6,9 @@ use kernel::{
         OptionalClk, //
     },
     device::{
-        Bound,
         Core,
         Device, //
     },
-    devres::Devres,
     dma::{
         Device as DmaDevice,
         DmaMask, //
@@ -30,7 +28,6 @@ use kernel::{
     sizes::SZ_2M,
     sync::{
         aref::ARef,
-        Arc,
         Mutex, //
     },
     time, //
@@ -44,7 +41,7 @@ use crate::{
     regs::gpu_control::*, //
 };
 
-pub(crate) type IoMem = kernel::io::mem::IoMem<'static, SZ_2M>;
+pub(crate) type IoMem<'a> = kernel::io::mem::IoMem<'a, SZ_2M>;
 
 pub(crate) struct TyrDrmDriver;
 
@@ -74,15 +71,11 @@ pub(crate) struct TyrDrmDeviceData {
     pub(crate) gpu_info: GpuInfo,
 }
 
-fn issue_soft_reset(dev: &Device<Bound>, iomem: &Devres<IoMem>) -> Result {
-    let io = (*iomem).access(dev)?;
-    io.write_reg(GPU_COMMAND::reset(ResetMode::SoftReset));
+fn issue_soft_reset(dev: &Device, iomem: &IoMem<'_>) -> Result {
+    iomem.write_reg(GPU_COMMAND::reset(ResetMode::SoftReset));
 
     poll::read_poll_timeout(
-        || {
-            let io = (*iomem).access(dev)?;
-            Ok(io.read(GPU_IRQ_RAWSTAT))
-        },
+        || Ok(iomem.read(GPU_IRQ_RAWSTAT)),
         |status| status.reset_completed(),
         time::Delta::from_millis(1),
         time::Delta::from_millis(100),
@@ -123,12 +116,12 @@ impl platform::Driver for TyrPlatformDriver {
         let sram_regulator = Regulator::<regulator::Enabled>::get(pdev.as_ref(), c"sram")?;
 
         let request = pdev.io_request_by_index(0).ok_or(ENODEV)?;
-        let iomem = Arc::new(request.iomap_sized::<SZ_2M>()?.into_devres()?, GFP_KERNEL)?;
+        let iomem = request.iomap_sized::<SZ_2M>()?;
 
         issue_soft_reset(pdev.as_ref(), &iomem)?;
         gpu::l2_power_on(pdev.as_ref(), &iomem)?;
 
-        let gpu_info = GpuInfo::new(pdev.as_ref(), &iomem)?;
+        let gpu_info = GpuInfo::new(&iomem);
         gpu_info.log(pdev.as_ref());
 
         let pa_bits = MMU_FEATURES::from_raw(gpu_info.mmu_features)

drivers/gpu/drm/tyr/gpu.rs

@@ -9,7 +9,6 @@ use kernel::{
         Bound,
         Device, //
     },
-    devres::Devres,
     io::{
         poll,
         register::Array,
@@ -40,10 +39,8 @@ use crate::{
 pub(crate) struct GpuInfo(pub(crate) uapi::drm_panthor_gpu_info);
 
 impl GpuInfo {
-    pub(crate) fn new(dev: &Device<Bound>, iomem: &Devres<IoMem>) -> Result<Self> {
-        let io = (*iomem).access(dev)?;
-
-        Ok(Self(uapi::drm_panthor_gpu_info {
+    pub(crate) fn new(io: &IoMem<'_>) -> Self {
+        Self(uapi::drm_panthor_gpu_info {
             gpu_id: io.read(GPU_ID).into_raw(),
             gpu_rev: io.read(REVIDR).into_raw(),
             csf_id: io.read(CSF_ID).into_raw(),
@@ -81,7 +78,7 @@ impl GpuInfo {
             pad: 0,
             //GPU_FEATURES register is not available; it was introduced in arch 11.x.
             gpu_features: 0,
-        }))
+        })
     }
 
     pub(crate) fn log(&self, dev: &Device<Bound>) {
@@ -163,15 +160,11 @@ const GPU_MODELS: [GpuModels; 1] = [GpuModels {
 }];
 
 /// Powers on the l2 block.
-pub(crate) fn l2_power_on(dev: &Device<Bound>, iomem: &Devres<IoMem>) -> Result {
-    let io = (*iomem).access(dev)?;
+pub(crate) fn l2_power_on(dev: &Device, io: &IoMem<'_>) -> Result {
     io.write_reg(L2_PWRON_LO::zeroed().with_const_request::<1>());
 
     poll::read_poll_timeout(
-        || {
-            let io = (*iomem).access(dev)?;
-            Ok(io.read(L2_READY_LO))
-        },
+        || Ok(io.read(L2_READY_LO)),
         |status| status.ready() == 1,
         Delta::from_millis(1),
         Delta::from_millis(100),