linux-kernel - [PATCH 02/10] drm/panthor: rename and document lock

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Message-ID: <20250916210823.4033529-3-olvaffe@gmail.com>
Date: Tue, 16 Sep 2025 14:08:15 -0700
From: Chia-I Wu <olvaffe@...il.com>
To: Boris Brezillon <boris.brezillon@...labora.com>,
	Steven Price <steven.price@....com>,
	Liviu Dudau <liviu.dudau@....com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Grant Likely <grant.likely@...aro.org>,
	Heiko Stuebner <heiko@...ech.de>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 02/10] drm/panthor: rename and document lock_region

Rename lock_region to mmu_hw_cmd_lock.

Signed-off-by: Chia-I Wu <olvaffe@...il.com>
---
 drivers/gpu/drm/panthor/panthor_mmu.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/panthor/panthor_mmu.c b/drivers/gpu/drm/panthor/panthor_mmu.c
index d3af4f79012b4..8600d98842345 100644
--- a/drivers/gpu/drm/panthor/panthor_mmu.c
+++ b/drivers/gpu/drm/panthor/panthor_mmu.c
@@ -545,8 +545,17 @@ static int write_cmd(struct panthor_device *ptdev, u32 as_nr, u32 cmd)
 	return status;
 }
 
-static void lock_region(struct panthor_device *ptdev, u32 as_nr,
-			u64 region_start, u64 size)
+/**
+ * mmu_hw_cmd_lock() - Issue a LOCK command
+ * @ptdev: Device.
+ * @as_nr: AS to issue command to.
+ * @region_start: Start of the region.
+ * @size: Size of the region.
+ *
+ * Issue a LOCK command to invalidate MMU caches and block future transactions
+ * for a region.
+ */
+static void mmu_hw_cmd_lock(struct panthor_device *ptdev, u32 as_nr, u64 region_start, u64 size)
 {
 	u8 region_width;
 	u64 region;
@@ -609,7 +618,7 @@ static int mmu_hw_do_operation_locked(struct panthor_device *ptdev, int as_nr,
 	 * power it up
 	 */
 
-	lock_region(ptdev, as_nr, iova, size);
+	mmu_hw_cmd_lock(ptdev, as_nr, iova, size);
 
 	ret = mmu_hw_wait_ready(ptdev, as_nr);
 	if (ret)
-- 
2.51.0.384.g4c02a37b29-goog