drm/amdgpu: move atom scratch setup into amdgpu_atombios.c

There will be a slightly different version for atomfirmware.

Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Ken Wang <Qingqing.Wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
index 56a86dd5789e..f52b1bf3d3d9 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
@@ -1748,3 +1748,31 @@ void amdgpu_atombios_copy_swap(u8 *dst, u8 *src, u8 num_bytes, bool to_le)
         memcpy(dst, src, num_bytes);
 #endif
 }
+
+int amdgpu_atombios_allocate_fb_scratch(struct amdgpu_device *adev)
+{
+        struct atom_context *ctx = adev->mode_info.atom_context;
+        int index = GetIndexIntoMasterTable(DATA, VRAM_UsageByFirmware);
+        uint16_t data_offset;
+        int usage_bytes = 0;
+        struct _ATOM_VRAM_USAGE_BY_FIRMWARE *firmware_usage;
+
+        if (amdgpu_atom_parse_data_header(ctx, index, NULL, NULL, NULL, &data_offset)) {
+                firmware_usage = (struct _ATOM_VRAM_USAGE_BY_FIRMWARE *)(ctx->bios + data_offset);
+
+                DRM_DEBUG("atom firmware requested %08x %dkb\n",
+                          le32_to_cpu(firmware_usage->asFirmwareVramReserveInfo[0].ulStartAddrUsedByFirmware),
+                          le16_to_cpu(firmware_usage->asFirmwareVramReserveInfo[0].usFirmwareUseInKb));
+
+                usage_bytes = le16_to_cpu(firmware_usage->asFirmwareVramReserveInfo[0].usFirmwareUseInKb) * 1024;
+        }
+        ctx->scratch_size_bytes = 0;
+        if (usage_bytes == 0)
+                usage_bytes = 20 * 1024;
+        /* allocate some scratch memory */
+        ctx->scratch = kzalloc(usage_bytes, GFP_KERNEL);
+        if (!ctx->scratch)
+                return -ENOMEM;
+        ctx->scratch_size_bytes = usage_bytes;
+        return 0;
+}