[PATCH v2 02/12] drm/tyr: move clock cleanup into Clocks Drop impl

[Deborah Brouwer <deborah.brouwer@collabora.com>]

Currently Tyr disables its clocks from TyrDrmDeviceData::drop(), which
causes them to be shut down before any other fields in TyrDrmDeviceData
are dropped. This prevents us from using the clocks when dropping the
other fields in TyrDrmDeviceData.

In order to better control when the clocks are dropped, move this cleanup
logic into a Drop implementation on the Clocks struct itself.

Since it serves no further purpose, remove the PinnedDrop implementation
for TyrDrmDeviceData.

Also, while here, remove the #[pin_data] annotation from both the struct
Clocks and struct Regulators since neither of these structs need this
macro to create structurally pinned fields.

Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: Deborah Brouwer <deborah.brouwer@collabora.com>
---
Changes in v2:
- Mention pinning changes in commit message.
- Pick up Reviewed-by tags.

 drivers/gpu/drm/tyr/driver.rs | 23 +++++++++--------------
 1 file changed, 9 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/tyr/driver.rs b/drivers/gpu/drm/tyr/driver.rs
index 38e5268e881a..4fff01478391 100644
--- a/drivers/gpu/drm/tyr/driver.rs
+++ b/drivers/gpu/drm/tyr/driver.rs
@@ -54,7 +54,7 @@ pub(crate) struct TyrPlatformDriverData {
     _device: ARef<TyrDrmDevice>,
 }
 
-#[pin_data(PinnedDrop)]
+#[pin_data]
 pub(crate) struct TyrDrmDeviceData {
     pub(crate) pdev: ARef<platform::Device>,
 
@@ -168,17 +168,6 @@ impl PinnedDrop for TyrPlatformDriverData {
     fn drop(self: Pin<&mut Self>) {}
 }
 
-#[pinned_drop]
-impl PinnedDrop for TyrDrmDeviceData {
-    fn drop(self: Pin<&mut Self>) {
-        // TODO: the type-state pattern for Clks will fix this.
-        let clks = self.clks.lock();
-        clks.core.disable_unprepare();
-        clks.stacks.disable_unprepare();
-        clks.coregroup.disable_unprepare();
-    }
-}
-
 // We need to retain the name "panthor" to achieve drop-in compatibility with
 // the C driver in the userspace stack.
 const INFO: drm::DriverInfo = drm::DriverInfo {
@@ -202,14 +191,20 @@ impl drm::Driver for TyrDrmDriver {
     }
 }
 
-#[pin_data]
 struct Clocks {
     core: Clk,
     stacks: OptionalClk,
     coregroup: OptionalClk,
 }
 
-#[pin_data]
+impl Drop for Clocks {
+    fn drop(&mut self) {
+        self.core.disable_unprepare();
+        self.stacks.disable_unprepare();
+        self.coregroup.disable_unprepare();
+    }
+}
+
 struct Regulators {
     _mali: Regulator<regulator::Enabled>,
     _sram: Regulator<regulator::Enabled>,
-- 
2.52.0