drm/amdgpu: add read_bios_from_rom callback for VI parts

Read the vbios image directly from the rom.

Reviewed-by: Jammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Monk Liu <monk.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 33 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/vi.c b/drivers/gpu/drm/amd/amdgpu/vi.c
index 2adc1c855e85..bf5bd931b8ca 100644
--- a/drivers/gpu/drm/amd/amdgpu/vi.c
+++ b/drivers/gpu/drm/amd/amdgpu/vi.c
@@ -376,6 +376,38 @@ static bool vi_read_disabled_bios(struct amdgpu_device *adev)
         WREG32_SMC(ixROM_CNTL, rom_cntl);
         return r;
 }
+
+static bool vi_read_bios_from_rom(struct amdgpu_device *adev,
+                                  u8 *bios, u32 length_bytes)
+{
+        u32 *dw_ptr;
+        unsigned long flags;
+        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;
+        /* take the smc lock since we are using the smc index */
+        spin_lock_irqsave(&adev->smc_idx_lock, flags);
+        /* set rom index to 0 */
+        WREG32(mmSMC_IND_INDEX_0, ixROM_INDEX);
+        WREG32(mmSMC_IND_DATA_0, 0);
+        /* set index to data for continous read */
+        WREG32(mmSMC_IND_INDEX_0, ixROM_DATA);
+        for (i = 0; i < length_dw; i++)
+                dw_ptr[i] = RREG32(mmSMC_IND_DATA_0);
+        spin_unlock_irqrestore(&adev->smc_idx_lock, flags);
+
+        return true;
+}
+
 static struct amdgpu_allowed_register_entry tonga_allowed_read_registers[] = {
         {mmGB_MACROTILE_MODE7, true},
 };
@@ -1368,6 +1400,7 @@ static uint32_t vi_get_rev_id(struct amdgpu_device *adev)
 static const struct amdgpu_asic_funcs vi_asic_funcs =
 {
         .read_disabled_bios = &vi_read_disabled_bios,
+        .read_bios_from_rom = &vi_read_bios_from_rom,
         .read_register = &vi_read_register,
         .reset = &vi_asic_reset,
         .set_vga_state = &vi_vga_set_state,