[PATCH 3/5] drm/panfrost: add support for reset quirk
From: Neil Armstrong <hidden>
Date: 2020-09-08 20:04:41
Also in:
dri-devel, linux-amlogic, lkml
Subsystem:
arm mali panfrost drm driver, drm drivers, drm drivers and misc gpu patches, the rest · Maintainers:
Boris Brezillon, Rob Herring, Steven Price, Adrián Larumbe, David Airlie, Simona Vetter, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Linus Torvalds
The T820, G31 & G52 GPUs integratewd by Amlogic in the respective GXM, G12A/SM1 & G12B SoCs needs a quirk in the PWR registers at the GPU reset time. This adds a callback in the device compatible struct of permit this. Signed-off-by: Neil Armstrong <redacted> --- drivers/gpu/drm/panfrost/panfrost_device.h | 3 +++ drivers/gpu/drm/panfrost/panfrost_gpu.c | 4 ++++ 2 files changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
index 2cf1a6a13af8..4c9cd5452ba5 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.h
+++ b/drivers/gpu/drm/panfrost/panfrost_device.h@@ -73,6 +73,9 @@ struct panfrost_compatible { /* IOMMU quirks flags */ unsigned long pgtbl_quirks; + + /* Vendor implementation quirks at reset time callback */ + void (*vendor_reset_quirk)(struct panfrost_device *pfdev); }; struct panfrost_device {
diff --git a/drivers/gpu/drm/panfrost/panfrost_gpu.c b/drivers/gpu/drm/panfrost/panfrost_gpu.c
index e0f190e43813..c129aaf77790 100644
--- a/drivers/gpu/drm/panfrost/panfrost_gpu.c
+++ b/drivers/gpu/drm/panfrost/panfrost_gpu.c@@ -62,6 +62,10 @@ int panfrost_gpu_soft_reset(struct panfrost_device *pfdev) gpu_write(pfdev, GPU_INT_CLEAR, GPU_IRQ_RESET_COMPLETED); gpu_write(pfdev, GPU_CMD, GPU_CMD_SOFT_RESET); + /* The Amlogic GPU integration needs quirks at this stage */ + if (pfdev->comp->vendor_reset_quirk) + pfdev->comp->vendor_reset_quirk(pfdev); + ret = readl_relaxed_poll_timeout(pfdev->iomem + GPU_INT_RAWSTAT, val, val & GPU_IRQ_RESET_COMPLETED, 100, 10000);
--
2.22.0
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