drm/amdgpu: implement si_read_bios_from_rom

This allows us to read the vbios image directly from ROM.
This is already implemented for other asics, but was not
yet available for SI.

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

diff --git a/drivers/gpu/drm/amd/amdgpu/si.c b/drivers/gpu/drm/amd/amdgpu/si.c
index f45fb0f..812a24d 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/si.c
+++ b/drivers/gpu/drm/amd/amdgpu/si.c
@@ -1150,6 +1150,33 @@ static bool si_read_disabled_bios(struct amdgpu_device *adev)
        return r;
 }
 
+#define mmROM_INDEX 0x2A
+#define mmROM_DATA  0x2B
+
+static bool si_read_bios_from_rom(struct amdgpu_device *adev,
+                                 u8 *bios, u32 length_bytes)
+{
+       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(mmROM_INDEX, 0);
+       for (i = 0; i < length_dw; i++)
+               dw_ptr[i] = RREG32(mmROM_DATA);
+
+       return true;
+}
+
 //xxx: not implemented
 static int si_asic_reset(struct amdgpu_device *adev)
 {
@@ -1206,6 +1233,7 @@ static void si_detect_hw_virtualization(struct amdgpu_device *adev)
 static const struct amdgpu_asic_funcs si_asic_funcs =
 {
        .read_disabled_bios = &si_read_disabled_bios,
+       .read_bios_from_rom = &si_read_bios_from_rom,
        .read_register = &si_read_register,
        .reset = &si_asic_reset,
        .set_vga_state = &si_vga_set_state,