With the introduction of the as_lock to serialize address space registers,
the hwaccess_lock is only used within the job code and is not protecting
anything. panfrost_job_hw_submit() only accesses registers for 1 job slot
and it's already serialized by drm_sched.
Fixes: 7282f7645d06 ("drm/panfrost: Implement per FD address spaces")
Cc: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx>
Cc: Steven Price <steven.price@xxxxxxx>
Cc: Alyssa Rosenzweig <alyssa.rosenzweig@xxxxxxxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
---
v3:
- New patch
drivers/gpu/drm/panfrost/panfrost_device.c | 1 -
drivers/gpu/drm/panfrost/panfrost_device.h | 2 --
drivers/gpu/drm/panfrost/panfrost_job.c | 4 ----
3 files changed, 7 deletions(-)
diff --git a/drivers/gpu/drm/panfrost/panfrost_device.c b/drivers/gpu/drm/panfrost/panfrost_device.c
index 73805210834e..46b0b02e4289 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.c
+++ b/drivers/gpu/drm/panfrost/panfrost_device.c
@@ -124,7 +124,6 @@ int panfrost_device_init(struct panfrost_device *pfdev)
INIT_LIST_HEAD(&pfdev->scheduled_jobs);
INIT_LIST_HEAD(&pfdev->as_lru_list);
- spin_lock_init(&pfdev->hwaccess_lock);
spin_lock_init(&pfdev->as_lock);
err = panfrost_clk_init(pfdev);
diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
index b7fa08ed3a23..9c39b9794811 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.h
+++ b/drivers/gpu/drm/panfrost/panfrost_device.h
@@ -63,8 +63,6 @@ struct panfrost_device {
struct drm_device *ddev;
struct platform_device *pdev;
- spinlock_t hwaccess_lock;
-
void __iomem *iomem;
struct clk *clock;
struct clk *bus_clock;
diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c
index 18bcc9bac6d2..a58551668d9a 100644
--- a/drivers/gpu/drm/panfrost/panfrost_job.c
+++ b/drivers/gpu/drm/panfrost/panfrost_job.c
@@ -141,7 +141,6 @@ static void panfrost_job_write_affinity(struct panfrost_device *pfdev,
static void panfrost_job_hw_submit(struct panfrost_job *job, int js)
{
struct panfrost_device *pfdev = job->pfdev;
- unsigned long flags;
u32 cfg;
u64 jc_head = job->jc;
int ret;
@@ -158,7 +157,6 @@ static void panfrost_job_hw_submit(struct panfrost_job *job, int js)
cfg = panfrost_mmu_as_get(pfdev, &job->file_priv->mmu);
panfrost_devfreq_record_transition(pfdev, js);
- spin_lock_irqsave(&pfdev->hwaccess_lock, flags);
job_write(pfdev, JS_HEAD_NEXT_LO(js), jc_head & 0xFFFFFFFF);
job_write(pfdev, JS_HEAD_NEXT_HI(js), jc_head >> 32);
@@ -187,8 +185,6 @@ static void panfrost_job_hw_submit(struct panfrost_job *job, int js)
job, js, jc_head);
job_write(pfdev, JS_COMMAND_NEXT(js), JS_COMMAND_START);
-
- spin_unlock_irqrestore(&pfdev->hwaccess_lock, flags);
}
static void panfrost_acquire_object_fences(struct drm_gem_object **bos,
--
2.20.1
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