[PATCH] drm/amdgpu: implement si_read_bios_from_rom

[Christian König]

Am 12.07.2017 um 15:19 schrieb Alex Deucher:
> 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.
>
> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>

Acked-by: Christian König <christian.koenig at amd.com>

> ---
>   drivers/gpu/drm/amd/amdgpu/si.c | 28 ++++++++++++++++++++++++++++
>   1 file changed, 28 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/si.c b/drivers/gpu/drm/amd/amdgpu/si.c
> index dca956d..3f3e367 100644
> --- 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)
>   {
> @@ -1218,6 +1245,7 @@ static void si_invalidate_hdp(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,