drm/radeon/kms: add backend map workaround for barts
Same as Cypress. Signed-off-by: Alex Deucher <alexdeucher@gmail.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
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@ -1862,6 +1862,7 @@ static void evergreen_gpu_init(struct radeon_device *rdev)
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switch (rdev->family) {
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case CHIP_CYPRESS:
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case CHIP_HEMLOCK:
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case CHIP_BARTS:
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gb_backend_map = 0x66442200;
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break;
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case CHIP_JUNIPER:
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