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drm/panfrost: Remove unnecessary hwaccess_lock spin_lock 

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: 7282f7645d ("drm/panfrost: Implement per FD address spaces")
Cc: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190826223317.28509-9-robh@kernel.org
alistair/sunxi64-5.4-dsi
Rob Herring 2019-08-26 17:33:17 -05:00
parent 62f1089f3c
commit 45d0dbd15a
3 changed files with 0 additions and 7 deletions
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1
drivers/gpu/drm/panfrost/panfrost_device.c
View File

@ -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);

2
drivers/gpu/drm/panfrost/panfrost_device.h
View File

@ -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;

4
drivers/gpu/drm/panfrost/panfrost_job.c
View File

@ -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,