diff options
Diffstat (limited to 'drivers/gpu/drm/panthor/panthor_device.c')
| -rw-r--r-- | drivers/gpu/drm/panthor/panthor_device.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/drivers/gpu/drm/panthor/panthor_device.c b/drivers/gpu/drm/panthor/panthor_device.c index 6fbff516c1c1..00f7b8ce935a 100644 --- a/drivers/gpu/drm/panthor/panthor_device.c +++ b/drivers/gpu/drm/panthor/panthor_device.c @@ -22,6 +22,24 @@ #include "panthor_regs.h" #include "panthor_sched.h" +static int panthor_gpu_coherency_init(struct panthor_device *ptdev) +{ + ptdev->coherent = device_get_dma_attr(ptdev->base.dev) == DEV_DMA_COHERENT; + + if (!ptdev->coherent) + return 0; + + /* Check if the ACE-Lite coherency protocol is actually supported by the GPU. + * ACE protocol has never been supported for command stream frontend GPUs. + */ + if ((gpu_read(ptdev, GPU_COHERENCY_FEATURES) & + GPU_COHERENCY_PROT_BIT(ACE_LITE))) + return 0; + + drm_err(&ptdev->base, "Coherency not supported by the device"); + return -ENOTSUPP; +} + static int panthor_clk_init(struct panthor_device *ptdev) { ptdev->clks.core = devm_clk_get(ptdev->base.dev, NULL); @@ -156,7 +174,9 @@ int panthor_device_init(struct panthor_device *ptdev) struct page *p; int ret; - ptdev->coherent = device_get_dma_attr(ptdev->base.dev) == DEV_DMA_COHERENT; + ret = panthor_gpu_coherency_init(ptdev); + if (ret) + return ret; init_completion(&ptdev->unplug.done); ret = drmm_mutex_init(&ptdev->base, &ptdev->unplug.lock); |