drm/amdgpu/nv: add asic func for fetching vbios from rom directly

Needed as a fallback if the vbios can't be fetched by other means.

Reviewed-by: Xiaojie Yuan <xiaojie.yuan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/nv.c b/drivers/gpu/drm/amd/amdgpu/nv.c
index af68f9815f286da03def5232601da721a10c5c92..0ba66bef57468849a5d00d89ff51e90394862dda 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/nv.c
+++ b/drivers/gpu/drm/amd/amdgpu/nv.c
@@ -40,6 +40,7 @@
 #include "gc/gc_10_1_0_sh_mask.h"
 #include "hdp/hdp_5_0_0_offset.h"
 #include "hdp/hdp_5_0_0_sh_mask.h"
+#include "smuio/smuio_11_0_0_offset.h"
 
 #include "soc15.h"
 #include "soc15_common.h"
@@ -156,8 +157,27 @@ static bool nv_read_disabled_bios(struct amdgpu_device *adev)
 static bool nv_read_bios_from_rom(struct amdgpu_device *adev,
                                  u8 *bios, u32 length_bytes)
 {
-       /* TODO: will implement it when SMU header is available */
-       return false;
+       u32 *dw_ptr;
+       u32 i, length_dw;
+
+       if (bios == NULL)
+               return false;
+       if (length_bytes == 0)
+               return false;
+       /* APU vbios image is part of sbios image */
+       if (adev->flags & AMD_IS_APU)
+               return false;
+
+       dw_ptr = (u32 *)bios;
+       length_dw = ALIGN(length_bytes, 4) / 4;
+
+       /* set rom index to 0 */
+       WREG32(SOC15_REG_OFFSET(SMUIO, 0, mmROM_INDEX), 0);
+       /* read out the rom data */
+       for (i = 0; i < length_dw; i++)
+               dw_ptr[i] = RREG32(SOC15_REG_OFFSET(SMUIO, 0, mmROM_DATA));
+
+       return true;
 }
 
 static struct soc15_allowed_register_entry nv_allowed_read_registers[] = {