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drm/amdgpu: add a generic fb accessing helper function(v3)

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add a generic helper function for accessing framebuffer via MMIO

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Luben Tuikov <luben.tuikov@amd.com>
Signed-off-by: Tianci.Yin <tianci.yin@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Tianci.Yin
2019-09-30 13:33:50 +08:00
committed by Alex Deucher
parent 45cf454e4c
commit e35e2b117f
3 changed files with 33 additions and 11 deletions
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30
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
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@@ -153,6 +153,36 @@ bool amdgpu_device_is_px(struct drm_device *dev)
return false;
}
/**
* VRAM access helper functions.
*
* amdgpu_device_vram_access - read/write a buffer in vram
*
* @adev: amdgpu_device pointer
* @pos: offset of the buffer in vram
* @buf: virtual address of the buffer in system memory
* @size: read/write size, sizeof(@buf) must > @size
* @write: true - write to vram, otherwise - read from vram
*/
void amdgpu_device_vram_access(struct amdgpu_device *adev, loff_t pos,
uint32_t *buf, size_t size, bool write)
{
uint64_t last;
unsigned long flags;
last = size - 4;
for (last += pos; pos <= last; pos += 4) {
spin_lock_irqsave(&adev->mmio_idx_lock, flags);
WREG32_NO_KIQ(mmMM_INDEX, ((uint32_t)pos) | 0x80000000);
WREG32_NO_KIQ(mmMM_INDEX_HI, pos >> 31);
if (write)
WREG32_NO_KIQ(mmMM_DATA, *buf++);
else
*buf++ = RREG32_NO_KIQ(mmMM_DATA);
spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
}
}
/*
* MMIO register access helper functions.
*/